The source of oxygen in atmosphere is due to – (1) Photosynthesis (2) Excretion (3) Nitrogen fixation (4) Respiration

The source of oxygen in atmosphere is due to – (1) Photosynthesis (2) Excretion (3) Nitrogen fixation (4) Respiration
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(1) Photosynthesis Explanation: The main source of atmospheric free oxygen is photosynthesis, which produces sugars and free oxygen from carbon dioxide and water. The organ-isms that carry out photosynthesis include the plant life of the land areas as well as the phytoplankton of the oceans. 6CO2 + 6H2O + energy —> C6H12O6 + 6O2
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The source of oxygen in atmosphere is due to (1) Photosynthesis (2) Excretion (3) Nitrogen fixation (4) Respiration

Description : The source of oxygen in atmosphere is due to (1) Photosynthesis (2) Excretion (3) Nitrogen fixation (4) Respiration

Last Answer : Photosynthesis

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

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 balance of CO2 and O2 in atmosphere is due to _____. (1) Transportation (2) Photosynthesis (3) Respiration (4) Evaporation

Description : The balance of CO2 and O2 in atmosphere is due to _____. (1) Transportation (2) Photosynthesis (3) Respiration (4) Evaporation

Last Answer : (2) Photosynthesis Explanation: Photosynthesis takes in the carbon dioxide produced by all breathing organisms and reintroduces oxygen into the atmosphere.

All of the following are features of prokaryotes except A- nitrogen fixation B- photosynthesis C- sexual reproductionD- .locomotion

Description : All of the following are features of prokaryotes except A- nitrogen fixation B- photosynthesis C- sexual reproductionD- .locomotion

Last Answer : sexual reproduction

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds (c) Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification

Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification

Last Answer : (d) Anaerobic ammonium oxidation and denitrification

The process in which nitrogen is released into the atmosphere is (1) Ammonification (2) Denitrification (3) Biological nitrogen Fixation (4) Nitirification

Description : The process in which nitrogen is released into the atmosphere is (1) Ammonification (2) Denitrification (3) Biological nitrogen Fixation (4) Nitirification

Last Answer :  Biological nitrogen Fixation 

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation? (a) Leghaemoglobin scavenges oxygen and is pinkish in colour. (b) Nodules act as sites for nitrogen fixation. (c) The enzyme nitrogenase catalyses the conversion of atmospheric N2 to NH3. (d) Nitrogenase is insensitive to oxygen.

Description : Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation ... the conversion of atmospheric N2 to NH3. (d) Nitrogenase is insensitive to oxygen.

Last Answer : (d) Nitrogenase is insensitive to oxygen.

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by (a) carotene (b) cytochrome (c) leghaemoglobin (d) xanthophyll

Description : During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by (a) carotene (b) cytochrome (c) leghaemoglobin (d) xanthophyll

Last Answer : (c) leghaemoglobin

“Azotobacter” bacteria is known for biological fixation of which atmospheric gas? a. A Oxygen b. B Nitrogen c. C Carbon Dioxide d. D Helium

Description : “Azotobacter” bacteria is known for biological fixation of which atmospheric gas? a. A Oxygen b. B Nitrogen c. C Carbon Dioxide d. D Helium

Last Answer : b. B Nitrogen

“Azotobacter” bacteria is known for biological fixation of which atmospheric gas? a. A Oxygen b. B Nitrogen c. C Carbon Dioxide d. D Helium

Description : “Azotobacter” bacteria is known for biological fixation of which atmospheric gas? a. A Oxygen b. B Nitrogen c. C Carbon Dioxide d. D Helium

Last Answer : b. B Nitrogen

The use of oxygen gas (02) in an exergonic pathway generating ATP is called a. Anaerobic Respiration. b. Photosynthesis. c. Aerobic Respiration. d. Fermentation.

Description : The use of oxygen gas (02) in an exergonic pathway generating ATP is called a. Anaerobic Respiration. b. Photosynthesis. c. Aerobic Respiration. d. Fermentation.

Last Answer : c. Aerobic Respiration.

Respiration that does NOT require oxygen is called: a) photosynthesis b) oxidation c) anaerobic respiration d) aerobic respiration

Description : Respiration that does NOT require oxygen is called: a) photosynthesis b) oxidation c) anaerobic respiration d) aerobic respiration

Last Answer : ANSWER: C -- ANAEROBIC RESPIRATION

The source of oxygen in atmosphere is due to

Description : The source of oxygen in atmosphere is due to

Last Answer : Photosynthesis

Oxygen liberated during photosynthesis is coming from : (1) Carbon dioxide (2) Water (3) Bresk down of chlorophy II (4) Atmosphere

Description : Oxygen liberated during photosynthesis is coming from : (1) Carbon dioxide (2) Water (3) Bresk down of chlorophy II (4) Atmosphere

Last Answer : (2) Water Explanation: Oxygen liberated during photosynthesis is coming m6t.o create a stable, unstirred layer to support surface neutralization of acid and act as a protective physical barrier against luminal pepsin.

Oxygen liberated during photosynthesis is coming from : (1) Carbon dioxide (2) Water (3) Bresk down of chlorophy II (4) Atmosphere

Description : Oxygen liberated during photosynthesis is coming from : (1) Carbon dioxide (2) Water (3) Bresk down of chlorophy II (4) Atmosphere

Last Answer : Water

PGA as the first `CO_(2)` fixation product was discovered in photosynthesis of

Description : PGA as the first `CO_(2)` fixation product was discovered in photosynthesis of

Last Answer : PGA as the first `CO_(2)` fixation product was discovered in photosynthesis of A. Angiosperm B. Alga C. Bryophyte D. Gymnosperm

Reducing agent for `CO_(2)` fixation in bacterial photosynthesis is

Description : Reducing agent for `CO_(2)` fixation in bacterial photosynthesis is

Last Answer : Reducing agent for `CO_(2)` fixation in bacterial photosynthesis is A. `NADH_(2)` B. `NADPH_(2)` C. `FMNH_(2)` D. All of these

The bulk fixation of carbon through photosynthesis takes place in

Description : The bulk fixation of carbon through photosynthesis takes place in

Last Answer : The bulk fixation of carbon through photosynthesis takes place in A. Crop plants B. Tropical rain forests C. Ocean D. Both (1) and (2)

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))

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

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.

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.

The kidneys in human beings are a part of the system for (i) nutrition (ii) respiration (iii) excretion (iv) transportation -Biology

Description : The kidneys in human beings are a part of the system for (i) nutrition (ii) respiration (iii) excretion (iv) transportation -Biology

Last Answer : Answer. The kidneys in human beings are a part of the system for excretion and it process of the metabolic waste which can eliminated from an organism. In this vertebrates this become primarily carried out ... and other part of the skin. it is more important process in major form of the life.

In what process does Hydra complete respiration and excretion ?

Description : In what process does Hydra complete respiration and excretion ?

Last Answer : Hydra completes respiration and excretion in the diffusion process.

The diaphragm assists in (a) digestion (b) respiration (c) circulation of blood (d) excretion of waste

Description : The diaphragm assists in (a) digestion (b) respiration (c) circulation of blood (d) excretion of waste

Last Answer : Ans:(b)

********* factor is involved in – (1) Blood Coagulation (2) Excretion (3) Digestion (4) Respiration

Description : Christmas factor is involved in – (1) Blood Coagulation (2) Excretion (3) Digestion (4) Respiration

Last Answer : (1) Blood Coagulation Explanation: Factor IX, also known as Christmas factor, is one of the serine proteases of the coagulation system; it belongs to peptidase family Sl. Deficiency of this ... young boy named Stephen Christmas was found to be lacking this exact factor, leading to haemophilia.

Allarltois of Embryo helps in - (1) digestion (3) excretion (2) respiration (4) protection

Description : Allarltois of Embryo helps in - (1) digestion (3) excretion (2) respiration (4) protection

Last Answer : (3) excretion Explanation: The allantois is the sac-like extraembryonic membrane that removes waste from the embryo. As the embryo grows, so does the allantois, eventually pressing against the chorion. ... side the eggshell. In addition, the allantois also serves as a disposal site for uric acid.

Mycoplasma is associated with a disease that affects the organs of - (1) respiration (2) excretion (3) reproduction (4) digestion

Description : Mycoplasma is associated with a disease that affects the organs of - (1) respiration (2) excretion (3) reproduction (4) digestion

Last Answer : (1) respiration Explanation: Mycoplasma refers to a genus of bacteria that lack a cell wall. Several species are pathogenic in humans, including M. pneumoniae, which is an important cause ... respiratory disorders, and M. genitalium, which is believed to be involved in pelvic inflammatory diseases.

Vegetables and fruits should be a part of our diet because they stimulate - (1) Peristalsis (2) Salivation (3) Excretion (4) Respiration

Description : Vegetables and fruits should be a part of our diet because they stimulate - (1) Peristalsis (2) Salivation (3) Excretion (4) Respiration

Last Answer : (1) Peristalsis Explanation: Vegetable and fruits should be a part of our diet because they stimulate peristalsis.

Primary function of enteronephric nephridia of Pheretima is (a) osmoregulation (b) excretion of nitrogenous wastes (c) respiration (d) locomotion.

Description : Primary function of enteronephric nephridia of Pheretima is (a) osmoregulation (b) excretion of nitrogenous wastes (c) respiration (d) locomotion.

Last Answer : (a) osmoregulation

Green gland is associated with a) Excretion b) Nutrition c) Defence d) Respiration

Description : Green gland is associated with a) Excretion b) Nutrition c) Defence d) Respiration

Last Answer : a) Excretion

********* factor is involved in : (1) Blood Coagulation (2) Excretion (3) Digestion (4) Respiration

Description : Christmas factor is involved in : (1) Blood Coagulation (2) Excretion (3) Digestion (4) Respiration

Last Answer : Blood Coagulation

Allantois of Embryo helps in (1) digestion (2) respiration (3) excretion (4) protection

Description : Allantois of Embryo helps in (1) digestion (2) respiration (3) excretion (4) protection

Last Answer : excretion

Vegetables and fruits should be a part of our diet because they stimulate (1) Peristalsis (2) Salivation (3) Excretion (4) Respiration

Description : Vegetables and fruits should be a part of our diet because they stimulate (1) Peristalsis (2) Salivation (3) Excretion (4) Respiration

Last Answer : Peristalsis

Mycoplasma is associated with a disease that affects the organs of (1) respiration (2) excretion (3) reproduction (4) digestion

Description : Mycoplasma is associated with a disease that affects the organs of (1) respiration (2) excretion (3) reproduction (4) digestion

Last Answer : respiration

Anaerobic respiration is a. Respiration using electron acceptors other than molecular oxygen b. Respiration using neutron acceptors other than molecular hydrogen c. Respiration using proton acceptors other than molecular nitrogen d. None of the above

Description : Anaerobic respiration is a. Respiration using electron acceptors other than molecular oxygen b. Respiration using neutron acceptors other than molecular hydrogen c. Respiration using proton acceptors other than molecular nitrogen d. None of the above

Last Answer : a. Respiration using electron acceptors other than molecular oxygen

The shade of a tree is cooler than the shade of a roof due to: (a) Respiration (b) Photosynthesis (c) Transpiration (d) Guttation

Description : The shade of a tree is cooler than the shade of a roof due to: (a) Respiration (b) Photosynthesis (c) Transpiration (d) Guttation

Last Answer : Ans. ((c))

Plants are dried up in winter due to frost because – (1) Evaporation does not take place (2) Photosynthesis does not take place at such low temperature (3) Respiration does not take place at low temperature (4) There is mechanical loss of tissues and drought condition prevails

Description : Plants are dried up in winter due to frost because – (1) Evaporation does not take place (2) Photosynthesis does not take place at such low temperature (3) Respiration does not take place at low temperature (4) There is mechanical loss of tissues and drought condition prevails

Last Answer : (4) There is mechanical loss of tissues and drought condition prevails Explanation: Respiration does not rely on the sun, so it is possible for plants to respire around the clock. The rate of respiration ... drought in that frozen water is unavailable to the plant. The air is very dry as well.

Plants are dried up in winter due to frost because (1) Evaporation does not take place (2) Photosynthesis does not take place at such low temperature (3) Respiration does not take place at low temperature (4) There is mechanical loss of tissues and drought condition prevails

Description : Plants are dried up in winter due to frost because (1) Evaporation does not take place (2) Photosynthesis does not take place at such low temperature (3) Respiration does not take place at low temperature (4) There is mechanical loss of tissues and drought condition prevails

Last Answer : There is mechanical loss of tissues and drought condition prevails

To carry out photosynthesis plants require – (1) Oxygen (2) Carbon-dioxide (3) Nitrogen (4) Hydrogen

Description : To carry out photosynthesis plants require – (1) Oxygen (2) Carbon-dioxide (3) Nitrogen (4) Hydrogen

Last Answer : (2) Carbon-dioxide Explanation: In photosynthesis, carbon dioxide is converted into sugars in a process called carbon fixation. Carbon fixation is a redox reaction, so photosynthesis needs to ... the electrons needed to convert carbon dioxide into a carbohydrate, which is a reduction reaction.

During photosynthesis in plants, the gas evolved is - (1) Carbon dioxide (2) Nitrogen (3) Oxygen (4) Hydrogen

Description : During photosynthesis in plants, the gas evolved is - (1) Carbon dioxide (2) Nitrogen (3) Oxygen (4) Hydrogen

Last Answer : (3) Oxygen Explanation: Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism ... , through primary production, or indirectly, as the ultimate source of the energy in their food.

During photosynthesis the liberated gas is (1) Carbon dioxide (2) oxygen (3) Nitrogen (4) Hydrogen

Description : During photosynthesis the liberated gas is (1) Carbon dioxide (2) oxygen (3) Nitrogen (4) Hydrogen

Last Answer : (2) oxygen Explanation: Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism ... water, releasing oxygen as a waste product.' Photosynthesis is vital for all aerobic life on Earth.

Which of the following gases do plants and trees give out during photosynthesis? A. Hydrogen B. Nitrogen C. Oxygen (Answer) D. Carbon dioxide

Description : Which of the following gases do plants and trees give out during photosynthesis? A. Hydrogen B. Nitrogen C. Oxygen (Answer) D. Carbon dioxide

Last Answer : C. Oxygen (Answer)

To carry out photosynthesis plants require (1) Oxygen (2) Carbon-dioxide (3) Nitrogen (4) Hydrogen

Description : To carry out photosynthesis plants require (1) Oxygen (2) Carbon-dioxide (3) Nitrogen (4) Hydrogen

Last Answer : Carbon-dioxide

During photosynthesis green plants absorb (1) nitrogen (2) carbon dioxide (3) carbon monoxide (4) oxygen

Description : During photosynthesis green plants absorb (1) nitrogen (2) carbon dioxide (3) carbon monoxide (4) oxygen

Last Answer : carbon dioxide

During photosynthesis in plants, the gas evolved is (1) Carbon dioxide (2) Nitrogen (3) Oxygen (4) Hydrogen

Description : During photosynthesis in plants, the gas evolved is (1) Carbon dioxide (2) Nitrogen (3) Oxygen (4) Hydrogen

Last Answer : Oxygen

During photosynthesis the liberated gas is : (1) Carbon dioxide (2) Oxygen (3) Nitrogen (4) Hydrogen

Description : During photosynthesis the liberated gas is : (1) Carbon dioxide (2) Oxygen (3) Nitrogen (4) Hydrogen

Last Answer : Oxygen

Statement I Nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Statement II The reaction

Description : Statement I Nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Statement II The reaction

Last Answer : Statement I Nitrogen and oxygen are the main components in the atmosphere but these do not react ... D. Both are assertion and reason are incorrect

Statement I Nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Statement II The reaction

Description : Statement I Nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Statement II The reaction

Last Answer : Statement I Nitrogen and oxygen are the main components in the atmosphere but these do not react ... D. Both are assertion and reason are incorrect

What planet atmosphere is rich with oxygen and nitrogen?

Description : What planet atmosphere is rich with oxygen and nitrogen?

Last Answer : Feel Free to Answer