Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because (a) effective pumping of CO2 into bundle sheath cells (b) RuBisCO in C4 plants has higher affinity for CO2 (c) four carbon acids are the primary initial CO2 fixation products (d) the primary fixation of CO2 is mediated via PEP carboxylase. (2005) 65. In sugarcane plant

Photosynthesis in C4 plants is relatively less limited
by atmospheric CO2 levels because
(a) effective pumping of CO2 into bundle sheath
cells
(b) RuBisCO in C4 plants has higher affinity for
CO2
(c) four carbon acids are the primary initial CO2
fixation products
(d) the primary fixation of CO2 is mediated via PEP
carboxylase. (2005)
65. In sugarcane plant
by

1 Answer

Answer :

(d) the primary fixation of CO2 is mediated via PEP
carboxylase.
by

Related questions

Bundle sheath cells (a) are rich in PEP carboxylase (b) lack RuBisCO (c) lack both RuBisCO and PEP carboxylase (d) are rich in RuBisCO.

Description : Bundle sheath cells (a) are rich in PEP carboxylase (b) lack RuBisCO (c) lack both RuBisCO and PEP carboxylase (d) are rich in RuBisCO.

Last Answer : d) are rich in RuBisCO.

Which is the first CO2 acceptor enzyme in C4 plants? (a) RuDP carboxylase (b) Phosphoric acid (c) RuBisCO (d) PEP- carboxylase

Description : Which is the first CO2 acceptor enzyme in C4 plants? (a) RuDP carboxylase (b) Phosphoric acid (c) RuBisCO (d) PEP- carboxylase

Last Answer : (d) PEP- carboxylase

In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of (a) bundle sheath (b) phloem (c) epidermis (d) mesophyll.

Description : In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of (a) bundle sheath (b) phloem (c) epidermis (d) mesophyll.

Last Answer : (d) mesophyll.

In leaves of C4 plants, malic acid synthesis during CO2 fixation occurs in (a) bundle sheath (b) guard cells (c) epidermal cells (d) mesophyll cells

Description : In leaves of C4 plants, malic acid synthesis during CO2 fixation occurs in (a) bundle sheath (b) guard cells (c) epidermal cells (d) mesophyll cells

Last Answer : (d) mesophyll cells.

The CO2 fixation during C4 pathway occurs in the chloroplast of (a) guard cells (b) bundle sheath cells (c) mesophyll cells (d) spongy parenchyma.

Description : The CO2 fixation during C4 pathway occurs in the chloroplast of (a) guard cells (b) bundle sheath cells (c) mesophyll cells (d) spongy parenchyma.

Last Answer : (c) mesophyll cells

The enzyme that catalyses carbon dioxide fixation in C4 plants is (a) RuBP carboxylase (b) PEP carboxylase (c) carbonic anhydrase (d) carboxydismutase.

Description : The enzyme that catalyses carbon dioxide fixation in C4 plants is (a) RuBP carboxylase (b) PEP carboxylase (c) carbonic anhydrase (d) carboxydismutase.

Last Answer : (b) PEP carboxylase

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct? (a) Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate.(b) C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum. (c) Tomato is a greenhouse crop which can be grown in CO2-enriched atmosphere for higher yield. (d) Light saturation for CO2 fixation occurs at 10% of full sunlight.

Description : With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct? (a) Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate. ( ... for higher yield. (d) Light saturation for CO2 fixation occurs at 10% of full sunlight.

Last Answer : (b) C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum

The C4 plants are photosynthetically more efficient than C3 plants because (a) the CO2 efflux is not prevented (b) they have more chloroplasts (c) the CO2 compensation point is more (d) CO2 generated during photorespiration is trapped and recycled through PEP carboxylase.

Description : The C4 plants are photosynthetically more efficient than C3 plants because (a) the CO2 efflux is not prevented (b) they have more chloroplasts (c) the CO2 compensation point is more (d) CO2 generated during photorespiration is trapped and recycled through PEP carboxylase.

Last Answer : (b) they have more chloroplasts

Study the pathway given below. Atmospheric CO2 mesophyll cell Bundle sheath cell Plasma- desmata Plasma membrane Cell wall HCO Phosphoenol- 3 – pyruvate Cell wall C acid 4 C acid 3 Transport Transport Fixation by Calvin cycle C acid 4 C acid 3 CO2 In which of the following options correct words for all the three blanks A, B and C are indicated? A B C (a) Decarboxylation Reduction Regeneration (b) Fixation Transamination Regeneration (c) Fixation Decarboxylation Regeneration (d) Carboxylation Decarboxylation Reduction

Description : Study the pathway given below. Atmospheric CO2 mesophyll cell Bundle sheath cell Plasma- desmata Plasma membrane Cell wall HCO Phosphoenol- 3 - pyruvate Cell wall C acid ... b) Fixation Transamination Regeneration (c) Fixation Decarboxylation Regeneration (d) Carboxylation Decarboxylation Reduction

Last Answer : (c) Fixation Decarboxylation Regeneration

In plants, enzyme responsible for the synthesis of the malic acid is : (A) Rubisco (B) PEP carboxylase (C)Kinase (D) Urease

Description : In plants, enzyme responsible for the synthesis of the malic acid is : (A) Rubisco (B) PEP carboxylase (C)Kinase (D) Urease

Last Answer : (A) Rubisco

Which of the following anzymes is involved in the primary carboxylation in C4 plants? (a) RUBP Carboxylase (b) PEP(c) Oxygenase (d) Carboxylase

Description : Which of the following anzymes is involved in the primary carboxylation in C4 plants? (a) RUBP Carboxylase (b) PEP(c) Oxygenase (d) Carboxylase

Last Answer : (b) PEP

Photosynthesis in `C_(4)` plants is relatively less limited by atmospheric `CO_(2)` levels because

Description : Photosynthesis in `C_(4)` plants is relatively less limited by atmospheric `CO_(2)` levels because

Last Answer : Photosynthesis in `C_(4)` plants is relatively less limited by atmospheric `CO_(2)` levels because A. ... 4)` plants has higher affinity for `CO_(2)`

Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in (a) C4 plants (b) C2 plants (c) C3 and C4 plants (d) C3 plants.

Description : Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in (a) C4 plants (b) C2 plants (c) C3 and C4 plants (d) C3 plants.

Last Answer : (a) C4 plants

The primary acceptor, during CO2 fixation in C3 plants, is (a) phosphoenolpyruvate (PEP) (b) ribulose 1, 5-diphosphate (RuDP) (c) phosphoglyceric acid (PGA) (d) ribulose monophosphate (RMP).

Description : The primary acceptor, during CO2 fixation in C3 plants, is (a) phosphoenolpyruvate (PEP) (b) ribulose 1, 5-diphosphate (RuDP) (c) phosphoglyceric acid (PGA) (d) ribulose monophosphate (RMP).

Last Answer : (b) ribulose 1, 5-diphosphate (RuDP)

In C4 plants, Calvin cycle operates in (a) stroma of bundle sheath chloroplasts (b) grana of bundle sheath chloroplasts (c) grana of mesophyll chloroplasts (d) stroma of mesophyll chloroplasts.

Description : In C4 plants, Calvin cycle operates in (a) stroma of bundle sheath chloroplasts (b) grana of bundle sheath chloroplasts (c) grana of mesophyll chloroplasts (d) stroma of mesophyll chloroplasts.

Last Answer : (a) stroma of bundle sheath chloroplasts

Select the correct statement: (1) C4 pathway for. CO2 fixation were discovered by Hatch and Slack (2) CO2 is essential for photosynthesis (3) Addition of sodium carbonate in water retards photosynthetic rate in vallisneria (4) Phloem is the principal pathway for translocation of solutes

Description : Select the correct statement: (1) C4 pathway for. CO2 fixation were discovered by Hatch and Slack (2) CO2 is essential for photosynthesis (3) Addition of sodium carbonate in water retards photosynthetic rate in vallisneria (4) Phloem is the principal pathway for translocation of solutes

Last Answer : Ans. ((c))

In C4 plants, CO2 fixation is done by (a) sclerenchyma (b) chlorenchyma and hypodermis (c) mesophyll cells (d) guard cells.

Description : In C4 plants, CO2 fixation is done by (a) sclerenchyma (b) chlorenchyma and hypodermis (c) mesophyll cells (d) guard cells.

Last Answer : (c) mesophyll cells

First CO2 receptor in C4 plants is: (a) PGA (b) PEP (c) RuBD (d) OAA

Description : First CO2 receptor in C4 plants is: (a) PGA (b) PEP (c) RuBD (d) OAA

Last Answer : Ans. ((b))

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ? (1) Increasing atmospheric CO 2 concentration up to 0.05% can enhance CO 2 fixation rate (2) C 3 plants respond to higher temperatures with enhanced photosynthesis while C 4 plants have much lower temperature optimum (3) Tomato is a greenhouse crop which can be grown in CO 2 - enriched atmosphere for higher yield (4) Light saturation for CO 2 fixation occurs at 10% of full sunlight

Description : With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ? (1) Increasing atmospheric CO 2 concentration up to 0.05% can enhance CO 2 fixation ... for higher yield (4) Light saturation for CO 2 fixation occurs at 10% of full sunlight

Last Answer : (2) C 3 plants respond to higher temperatures with enhanced photosynthesis while C 4 plants have much lower temperature optimum

The most important enzyme involved in photosynthetic CO2 fixation in C4 plants

Description : The most important enzyme involved in photosynthetic CO2 fixation in C4 plants

Last Answer : Ans. PEP carboxylase

In sugarcane plant 14CO2 is fixed to malic acid, in which the enzyme that fixes CO2 is (a) ribulose biphosphate carboxylase (b) phosphoenol pyruvic acid carboxylase (c) ribulose phosphate kinase (d) fructose phosphatase.

Description : In sugarcane plant 14CO2 is fixed to malic acid, in which the enzyme that fixes CO2 is (a) ribulose biphosphate carboxylase (b) phosphoenol pyruvic acid carboxylase (c) ribulose phosphate kinase (d) fructose phosphatase.

Last Answer : (b) phosphoenol pyruvic acid carboxylase

Assertion :In `C_(4)` plants, the chloroplasts of bundle sheath cells are granal. Reason: PS II is mostly found in the appressed part of granum.

Description : Assertion :In `C_(4)` plants, the chloroplasts of bundle sheath cells are granal. Reason: PS II is mostly found in the appressed part of granum.

Last Answer : Assertion :In `C_(4)` plants, the chloroplasts of bundle sheath cells are granal. Reason: PS II ... false. D. If both Assertion and Reason are false.

In `C_(4)` plants , mesophyll cells and bundle sheath cells are specialized to perform, respectively,

Description : In `C_(4)` plants , mesophyll cells and bundle sheath cells are specialized to perform, respectively,

Last Answer : In `C_(4)` plants , mesophyll cells and bundle sheath cells are specialized to ... and photorespiration D. Photorespiration and dark reaction

Write the characteristics of bundle sheath cells of `C_(4)` plants

Description : Write the characteristics of bundle sheath cells of `C_(4)` plants

Last Answer : Write the characteristics of bundle sheath cells of `C_(4)` plants

C4 plants are more efficient in photosynthesis than C3 plants due to (a) higher leaf area(b) presence of larger number of chloroplasts in the leaf cells (c) presence of thin cuticle (d) lower rate of photorespiration

Description : C4 plants are more efficient in photosynthesis than C3 plants due to (a) higher leaf area (b) presence of larger number of chloroplasts in the leaf cells (c) presence of thin cuticle (d) lower rate of photorespiration

Last Answer : d) lower rate of photorespiration.

When in plant leaves, chloroplast containing bundle sheath cells surrounds vascular bundles in several layers that anatomy is known as

Description : When in plant leaves, chloroplast containing bundle sheath cells surrounds vascular bundles in several layers that anatomy is known as

Last Answer : When in plant leaves, chloroplast containing bundle sheath cells surrounds vascular bundles in several layers that anatomy is known as

Which of the following processes doesn't account for an increase in atmospheric CO2 (carbon dioxide) levels? w) deforestation x) photosynthetic processes y) plant respiration z) fossil fuel combustion

Description : Which of the following processes doesn't account for an increase in atmospheric CO2 (carbon dioxide) levels? w) deforestation x) photosynthetic processes y) plant respiration z) fossil fuel combustion

Last Answer : ANSWER: X -- PHOTOSYNTHETIC PROCESSES

For which substrate `RuBisCO` shows greater affinity?

Description : For which substrate `RuBisCO` shows greater affinity?

Last Answer : For which substrate `RuBisCO` shows greater affinity?

Select the false statement ? a. CAM cycle occurs in Mesophyll cells b. C3 plants are more efficient in photosynthesis than C4 plants c. Pineapple is CAM plant d. Maize is C4 plant

Description : Select the false statement ? a. CAM cycle occurs in Mesophyll cells b. C3 plants are more efficient in photosynthesis than C4 plants c. Pineapple is CAM plant d. Maize is C4 plant

Last Answer : b. C3 plants are more efficient in photosynthesis than C4 plants

In kranz anatomy, the bundle sheath cells have (a) thin walls, many intercellular spaces and no chloroplasts (b) thick walls, no intercellular spaces and large number of chloroplasts(c) thin walls, no intercellular spaces and several chloroplasts (d) thick walls, many intercellular spaces and few chloroplasts

Description : In kranz anatomy, the bundle sheath cells have (a) thin walls, many intercellular spaces and no chloroplasts (b) thick walls, no intercellular spaces and large number of chloroplasts ... intercellular spaces and several chloroplasts (d) thick walls, many intercellular spaces and few chloroplasts

Last Answer : (b) thick walls, no intercellular spaces and large number of chloroplasts

The best understood intracellular messenger is cyclic AMP (cAMP). Which of the following statement(s) concerning this intracellular messenger is/are correct? a. Intracellular cyclic AMP is constantly degraded by a specific enzyme, cAMP phosphodiesterase b. Most of the actions of cAMP are mediated by activation of protein kinase A c. Intracellular levels of cAMP are relatively stable and change solely in response to activation of adenylate cyclase d. cAMP is the only cyclic nucleotide active as an intracellular messenger

Description : The best understood intracellular messenger is cyclic AMP (cAMP). Which of the following statement(s) concerning this intracellular messenger is/are correct? a. Intracellular cyclic AMP is constantly ... of adenylate cyclase d. cAMP is the only cyclic nucleotide active as an intracellular messenger

Last Answer : Answer: a, b The prototypic intracellular messenger is cAMP. To function as a mediator, the concentration of cAMP must change rapidly. In resting cells, cAMP is continuously being degraded by ... produce cGMP. Intracellular calcium ions also serve as second messengers in a large number of cells

Name the enzyme that acts both as carboxylase at one time and oxygenase at another time. (A) PEP carboxylase (B) RuBP carboxylase (C) Carbonic anyhdrase (D) None of these

Description : Name the enzyme that acts both as carboxylase at one time and oxygenase at another time. (A) PEP carboxylase (B) RuBP carboxylase (C) Carbonic anyhdrase (D) None of these

Last Answer : Answer : B

Biotin is a coenzyme for (A) Pyruvate dehydrogenase (B) Pyruvate carboxylase (C) PEP carboxykinase (D) Glutamate pyruvate transminase

Description : Biotin is a coenzyme for (A) Pyruvate dehydrogenase (B) Pyruvate carboxylase (C) PEP carboxykinase (D) Glutamate pyruvate transminase

Last Answer : Answer : B

What is the main advantage of hydrodynamic bearing over roller bearing? (a) Easy to assemble [IES-2005] (b) Relatively low price (c) Superior load carrying capacity at higher speeds (d) Less frictional resistance

Description : What is the main advantage of hydrodynamic bearing over roller bearing? (a) Easy to assemble [IES-2005] (b) Relatively low price (c) Superior load carrying capacity at higher speeds (d) Less frictional resistance

Last Answer : (c) Superior load carrying capacity at higher speeds

The water from a hand pump is warm in winter because - (1) our body is cold in winter and the water appears to be warm (2) the temperature inside the Earth is higher than the atmospheric temperature (3) the pumping process causes friction which warms up the water (4) inside water comes out and absorbs heat from the environment

Description : The water from a hand pump is warm in winter because - (1) our body is cold in winter and the water appears to be warm (2) the temperature inside the Earth is higher than the atmospheric ... causes friction which warms up the water (4) inside water comes out and absorbs heat from the environment

Last Answer : (2) the temperature inside the Earth is higher than the atmospheric temperature

The water from a hand pump is warm in winter because - (1) our body is cold in winter and the water appears to be warm (2) the temperature inside the Earth is higher than the atmospheric temperature (3) the pumping process causes friction which warms up the water (4) inside water comes out and absorbs heat from the environment

Description : The water from a hand pump is warm in winter because - (1) our body is cold in winter and the water appears to be warm (2) the temperature inside the Earth is higher than the atmospheric ... causes friction which warms up the water (4) inside water comes out and absorbs heat from the environment

Last Answer : (2) the temperature inside the Earth is higher than the atmospheric temperature

The water from a hand pump is warm in winter because – (1) Our body is cold in winter and the water appears to be warm (2) The temperature inside the earth is higher than the atmospheric temperature (3) The pumping process causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment

Description : The water from a hand pump is warm in winter because - (1) Our body is cold in winter and the water appears to be warm (2) The temperature inside the earth is higher than the atmospheric ... causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment

Last Answer : (2) The temperature inside the earth is higher than the atmospheric temperature Explanation: In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the ... the outside temperature is higher than the water of the pump, and therefore, it feels cold.

The water from a hand pump is warm in winter because – (1) Our body is cold in winter and the water appears to be warm (2) The temperature inside the earth is higher than the atmospheric temperature (3) The pumping process causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment

Description : The water from a hand pump is warm in winter because - (1) Our body is cold in winter and the water appears to be warm (2) The temperature inside the earth is higher than the atmospheric ... causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment

Last Answer : (2) The temperature inside the earth is higher than the atmospheric temperature Explanation: In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the ... the outside temperature is higher than the water of the pump, and therefore, it feels cold.

The water from a hand pump is warm in winter because (1) Our body is cold in winter and the water appears to be warm (2) The temperature inside the earth is higher than the atmospheric temperature (3) The pumping process causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment

Description : The water from a hand pump is warm in winter because (1) Our body is cold in winter and the water appears to be warm (2) The temperature inside the earth is higher than the atmospheric ... causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment

Last Answer : The temperature inside the earth is higher than the atmospheric temperature

The neurohormonal arm of the stress response is well defined. Less is known about the inflammatory arm mediated primarily by cytokines. Which of the following statement(s) is/are true concerning this arm of the surgical stress response? a. Cytokines primarily work locally via direct cell-to-cell communication b. Cytokines are never detectable in the systemic bloodstream c. Cytokines are produced only by immune cells attracted to the site of injury d. Cytokine release may stimulate the release of other cytokines leading to an important cascade of events

Description : The neurohormonal arm of the stress response is well defined. Less is known about the inflammatory arm mediated primarily by cytokines. Which of the following statement(s) is/are true ... Cytokine release may stimulate the release of other cytokines leading to an important cascade of events

Last Answer : Answer: a, d Cytokines, which are produced at the site of injury by endothelial cells and by diverse immune cells throughout the body, also occupy a pivotal position in the stress response ... act as hormones and spill over into the systemic circulation and become detectable in the bloodstream

Vascular bundles in monocotyledons are considered closed because (a) there are no vessels with perforations (b) xylem is surrounded all around by phloem (c) a bundle sheath surrounds each bundle (d) cambium is absent.

Description : Vascular bundles in monocotyledons are considered closed because (a) there are no vessels with perforations (b) xylem is surrounded all around by phloem (c) a bundle sheath surrounds each bundle (d) cambium is absent.

Last Answer : (d) cambium is absent.

Incorporation of atmospheric N2to NH4 + occurs via the process of A.assimilatory nitrate reduction B.transamination C.deamination D.nitrogen fixation

Description : Incorporation of atmospheric N2to NH4 + occurs via the process of A.assimilatory nitrate reduction B.transamination C.deamination D.nitrogen fixation

Last Answer : D.nitrogen fixation

Plants adapted to low light intensity have (a) larger photosynthetic unit size than the sun plants (b) higher rate of CO2 fixation than the sun plants (c) more extended root system (d) leaves modified to spines.

Description : Plants adapted to low light intensity have (a) larger photosynthetic unit size than the sun plants (b) higher rate of CO2 fixation than the sun plants (c) more extended root system (d) leaves modified to spines.

Last Answer : (a) larger photosynthetic unit size than the sun plants

The transverse section of a plant shows following anatomical features : (i) Large number of scattered vascular bundles surrounded by bundle sheath (ii) Large conspicuous parenchymatous ground tissue (iii)vascular bundles conjoint and closed (iv) phloem parenchyma absent Identify the category of plant and its part. (a) Monocotyledonous stem (b) Monocotyledonous root (c) Dicotyledonous stem (d) Dicotyledonous root

Description : The transverse section of a plant shows following anatomical features : (i) Large number of scattered vascular bundles surrounded by bundle sheath (ii) Large conspicuous parenchymatous ground ... (a) Monocotyledonous stem (b) Monocotyledonous root (c) Dicotyledonous stem (d) Dicotyledonous root

Last Answer : (a) Monocotyledonous stem

PGA as the first CO2 fixation product was discovered in photosynthesis of (a) bryophyte (b) gymnosperm (c) angiosperm (d) alga.

Description : PGA as the first CO2 fixation product was discovered in photosynthesis of (a) bryophyte (b) gymnosperm (c) angiosperm (d) alga.

Last Answer : (d) alga.

CO2 acceptor in the mesophyll cells of a C4 plant is -Biology

Description : CO2 acceptor in the mesophyll cells of a C4 plant is -Biology

Last Answer : answer:

Water vapour comes out from the plant leaf through the stomatal opening. Through the samestomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options. (a) The above processes happen only during night time. (b) One process occurs during day time and the other at night. (c) Both processes cannot happen simultaneously. (d) Both processes can happen together because the diffusion coefficient of water and CO2 is different

Description : Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above ... Both processes can happen together because the diffusion coefficient of water and CO2 is different

Last Answer : (d) Both processes can happen together because the diffusion coefficient of water and CO2 is different

Which of the following regulates lipolysis in adipocytes? (A) Activation of fatty acid synthesis mediated by CAMP (B) Glycerol phosphorylation to prevent futile esterification of fatty acids (C) Activation of triglyceride lipase as a result of hormone stimulated increases in CAMP levels (D) Activation of CAMP production by Insulin

Description : Which of the following regulates lipolysis in adipocytes? (A) Activation of fatty acid synthesis mediated by CAMP (B) Glycerol phosphorylation to prevent futile esterification of fatty acids (C) ... result of hormone stimulated increases in CAMP levels (D) Activation of CAMP production by Insulin

Last Answer : Answer : C

The primary acceptor of CO2 in C4 cycle is? -Biology

Description : The primary acceptor of CO2 in C4 cycle is? -Biology

Last Answer : answer: