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.
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.
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
Description : 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 ... d) the primary fixation of CO2 is mediated via PEP carboxylase. (2005) 65. In sugarcane plant
Last Answer : (d) the primary fixation of CO2 is mediated via PEP carboxylase.
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
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
Description : Leaves of many grasses are capable of folding and unfolding because (1) their mesophyll is not differentiated into palisade and spongy parenchyma (2) they have stomata on both sides of the leaf (3) they have high levels of silica (4) they have specialised bulliform cells
Last Answer : (4) they have specialised bulli-form cells Explanation: Bulliform cells are large, bubbleshaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
Last Answer : they have specialised bulliform cells
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
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))
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
Description : CO2 acceptor in the mesophyll cells of a C4 plant is -Biology
Last Answer : answer:
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
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
Description : In the mesophyll cells of CAM plants, `CO_(2)` fixation during the night day occurs through
Last Answer : In the mesophyll cells of CAM plants, `CO_(2)` fixation during the night day occurs ... carboxylase D. Both RuBP carboxylase and PEP carboxylase
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
Description : Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following. (a) Tyloses in vessels (b) Closure of stomata (c) Flaccidity of bulliform cells (d) Shrinkage of air spaces in spongy mesophyll
Last Answer : (c) Flaccidity of bulliform cells
Description : What are the functions and adaptions of the following;a. Palisade cellb. Spongy mesophyll cellc. Sperm and egg celld. Ciliated cellse. Root hair cellf. Red and white blood cells?
Last Answer : common unvalidated interventions
Description : What is true about a monocot leaf? (a) Reticulate venation (b) Absence of bulliform cells from epidermis (c) Mesophyll not differentiated into palisade and spongy tissues
Last Answer : (c) Mesophyll not differentiated into palisade and spongy tissues
Description : The most important enzyme involved in photosynthetic CO2 fixation in C4 plants
Last Answer : Ans. PEP carboxylase
Description : Which one of the following is wrong in relation to photorespiration? (a) It occurs in chloroplast. (b) It occurs in day time only. (c) It is a characteristic of C4 plants. (d) It is a characteristic of C3 plants.
Last Answer : (c) It is a characteristic of C4 plants
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.
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
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
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.
Description : Spongy mesophyll cell function? -Biology
Description : What is spongy mesophyll? -Biology
Description : What is the function of the air spaces in the spongy mesophyll? -Biology
Description : Difference between palisade and spongy mesophyll? -Biology
Description : Why are there air spaces in the spongy mesophyll? -Biology
Description : Where is the spongy mesophyll located? -Biology
Description : (a) Draw a diagram to show open stomatal pore and label on it: (i) guard cells (ii) chloroplast (b) State two functions of stomata. (c) How do guard cells regulate the opening and closing of stomatal pore? -Biology
Last Answer : (a) (b) Two functions of stomata are: (i) Exchange of gases between the plant and the atmosphere takes place through stomata. (ii)Transpiration in plants takes place through stomata. ( ... through these stomata, the plant closes these pores when it does not require carbon dioxide for photosynthesis.
Description : The exchange of gases takes place in the leaves through these pores for the purpose of photosynthesis. These pores are called – (1) Guard Cells (2) Stomata (3) Chloroplast (4) None of the above
Last Answer : (2) Stomata Explanation: Stomata are tiny pores present on the surface of the leaves via which exchange of gases takes place in the leaves for the purpose of photosynthesis. However, exchange of gases also occurs across the surface of stems, roots and leaves as well.
Description : The opening and closing of the stomatal pores is a function of the - (1) Guard cells (2) Chloroplast (3) Xylem (4) Phloem
Last Answer : (1) Guard cells Explanation: The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
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.
Description : What are bundle sheath extensions? What is their role?
Last Answer : Ans: The extensions of bundle sheath of leaf towards adaxial and abaxial sides of leaf are called as bundle sheath extensions. They help in conduction and providing mechanical strength.
Description : A Parenchyma cell which stores ergastic substance is known as – (1) Phragmoblast (2) Idioblast (3) Conidioplast (4) Chloroplast
Last Answer : (2) Idioblast Explanation: Parenchyma cells containing ergastic substances are called idioblasts. Tannin cells, cells filled with raphides, etc. constitute idioblast. An idioblast is an isolated plant cell that differs from neighboring tissues. It carries out storage of reserves.
Description : A Parenchyma cell which stores ergastic substance is known as (1) Phragmoblast (2) Idioblast (3) Conidioplast (4) Chloroplast
Last Answer : Idioblast
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
Description : Name the two important enzymes of C3 and C4 pathway? -Biology
Description : What is C4 pathway in plants? -Biology
Description : First product of C4 pathway is
Last Answer : Ans. Oxalo acetic acid (OAA)
Description : Which of the following statements regarding the alternative complement pathway are true? a. C1, C4 and C2 are involved b. NH3 apparently activates complement via this pathway c. Factors B and D are involved d. Endotoxin activates complement via the alternative pathway
Last Answer : Answer: b, c, d The alternative pathway differs from the classic pathway in that the first steps involving C1, C4 and C2 are bypassed. (See Figure 6-3 previously reproduced.) ... been correlated with impaired renal function and the presence of complement components at the sites of renal injury
Description : Which of the following eicosanoids is generated through the lipozygenase pathway ? (a) Prostaglandin E2 (b) Thromboxane A2 (c) Prostacyclin (d) Leukotriene C4
Last Answer : Ans: D
Description : The following eicosanoid is generated through the lipoxygenase pathway: A. Prostaglandin E2 B. Thromboxane A2 C. Leukotriene C4 D. Prostacyclin
Last Answer : C. Leukotriene C4
Description : In the leaves of `C_(4)` plants, malic acid formation during `CO_(2)` fixation occurs in the cells of
Last Answer : In the leaves of `C_(4)` plants, malic acid formation during `CO_(2)` fixation occurs in the ... A. Epidermis B. Mesophyll C. Bundle sheath D. Phloem
Description : Which of the following gases makes bread or cake rise making them soft and spongy? (1) CO (2) H2 (3) CO2 (4) O2
Last Answer : (3) CO2 Explanation: Breads rise due to the process of fermentation, a chemical process by which molecules such as glucose are broken down an aerobically.
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
Description : Factors B and D are required in (A) The classical pathway of complement fixation (B) The alternate complement pathway (C) Both (A) and (B) (D) None of these
Last Answer : Answer : B
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)