Photorespiration

Q.

Why are C₄ plants more efficient than C₃ plants?

Q.

“All plants give out oxygen during the day and carbon dioxide during the night”. Do you agree with this statement? Give reason.

Q.

If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer.

Q. Photorespiration is a wasteful process because

1. no synthesis of sugar takes place
2. no ATP production takes place
3. CO${}_2$ is released using ATP
4. all of the above

Q. During photorespiration, the oxygen consuming reaction/reactions occur in

1. stroma of chloroplasts
2. stroma of chloroplasts and mitochondria
3. stroma of chloroplasts and peroxisomes
4. grana of chloroplasts and mitochondria

Q. The correct sequence of cell organelles during photorespiration is:

1. Chloroplast, mitochondria, peroxisome
2. Chloroplast, vacuole, peroxisome
3. Chloroplast, golgi bodies, mitochondria
4. Chloroplast, rough endoplasmic reticulum, dictyosomes

Q. Assertion: Self-incompatibility is a genetic mechanism that prevents self-pollen from the same flower or other flowers of the same plant from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.
Reason: In gametophytic self-incompatibility, the incompatibility is determined by the genotype of the sporophytic tissue of the plant from which the pollen is derived.

1. Both assertion and reason are true and reason is the correct explanation of assertion
2. Both assertion and reason are true but reason is not the correct explanation of assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false

Q.

What are the advantages and disadvantages of photorespiration in plants?

Q.

Is TCA cycle anabolic or catabolic?

Q. The correct sequence of cell organelles during photorespiration is:

1. Chloroplast, golgi bodies, mitochondria
2. Chloroplast, rough endoplasmic reticulum, dictyosomes
3. Chloroplast, mitochondria, peroxisome
4. Chloroplast, vacuole, peroxisome

Q. How many PGAL are produced by glycolysis of 3 molecules of glucose? How many ATP are released by respiration of these PGAL till formation $C{O}_2$ and $H_{2}O$?

1. 4 PGAL-40 ATP
2. 6 PGAL-114 ATP
3. 4 PGAL-80 ATP
4. 6 PGAL-160 ATP

Q. Which one of the following is wrong in relation to photorespiration?

1. It occurs in daytime only
2. It is a characteristic of $C_3$ plants
3. It occurs in chloroplasts
4. It is a characteristic of $C_4$ plants

Q.

In germinating seeds fatty acids are degraded exclusively in the?

1. Peroxisomes

2. Glyoxysomes

3. Proplastids

4. Mitochondria

Q.

Where is RuBisCO found in C3 plants?

Q.

Why is PEP carboxylase better than RuBisCO?

Q. In which form the Molybdenum is absorbed?

1. $M_o{O}_3^{-3}$
2. $Mo{O}_2^{+2}$
3. $Mo{O}_4^{-4}$
4. $Mo{O}_3^{-4}$

Q. Which of the following is not an action of ethylene ?

1. Induces leaf abscission
2. Inhibits root hair growth – decreasing the efficiency of water and mineral absorption
3. Induces the growth of adventitious roots during flooding
4. Stimulates epinasty – leaf petiole grows out, leaf hangs down and curls into itself

Q. What is called “Warburg’s effect” in photosynthesis?

1. Low rate of process due to $O_2$ supply
2. Low rate of the process due to $C{O}_2$ supply
3. Both a and b
4. None of the above

Q.

In photorespiration, what is the function of RuBisCO?

Q.

The amino acids produced during the Glycolate pathway of photorespiration are

1. Serine and glycine

2. Glycine and tryptophan

3. Serine and tryptophan

4. Glycine and alanine

Q. Which of the following is produced during photorespiration in $C_3$ plants?

1. 2 molecules of phosphoglycolate
2. 1 molecule of phosphoglycerate and 1 molecule of phosphoglycolate
3. 1 molecule of phosphoglycerate and 2 molecules of phosphoglycolate
4. 2 molecules of 3-phosphoglycerate

Q.

A student sets up an experiment on photosynthesis as follows: He takes soda water in a glass tumbler and add chlorophyll extracts into the contents and keeps the tumbler exposed to sunlight hoping that he has provided necessary ingredients for photosynthesis to proceed (viz., CO2, H2O, chlorophyll and light). What do you think what will happen after, say, a few hours of exposure of light?

1. Photosynthesis will take place and glucose will be produced.
2. Photosynthesis will take place and starch will be produced which will turn the mixture turbid.
3. Photosynthesis will not take place because CO2 dissolved in soda water escapes into the atmosphere.
4. Photosynthesis will not take place because intact chloroplasts are needed for the process.

Q.

Is opuntia a C4 plant?

Q. Choose the correct statement(s) about photorespiration:
I. It occurs due to high oxygen concentration and low carbon dioxide condition
II. Warburg effect is a decrease in the rate of photosynthesis at high oxygen content
III. Peroxisome and mitochondria are not related to photorespiration
IV. It involves the oxidation of RuBP

1. I and III
2. I and II only
3. I, II and IV only
4. III and IV

Q. Peroxisomes are involved in which type of pathway pertaining to plant photosynthesis?

1. Calvin Cycle
2. Photorespiration
3. C${}_4$ cycle
4. CAM pathway

Q.

Photorespiration lowers the efficiency of photosynthesis by preventing the formation of

1. carbon dioxide molecules

2. 3-phosphoglycerate molecules

3. ATP molecules.

4. ribulose bisphosphate molecules

Q.

What is the role of the enzyme RuBisCO?

Q. If the oxygen of CO2 (carbon dioxide) is radio labelled and provided to the plant, then which of following will show radioactivity in the cells exposed to sunlight?
1. Hexose 2.H2O 3.O2 4​​​​​​.​​​​​​Nadp⁺

Q. The first reaction in photorespiration is _____.

1. Carboxylation

2. Decarboxylation

3. Oxygenation

4. Phosphorylation

Q.

Is photorespiration the opposite of photosynthesis?