Photorespiration

Q. Photosynthesis in C4-plants is relatively less limited by atmospheric CO₂ levels because

1. Effective pumping of CO₂ in to bundle sheath cells.
2. RuBisCO in C4 -plants has higher affinity for CO₂.
3. Four carbon acids are the primary initial CO₂ fixation products.
4. The primary fixation of CO₂ is mediated via PEP carboxylase.

Q.

Photorespiration lowers the efficiency of photosynthesis by preventing the formation of

1. carbon dioxide molecules

2. 3-phosphoglycerate molecules

3. ribulose bisphosphate molecules

4. ATP molecules.

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.

Name the scientists who have contributed to the following:

1. Reverse transcription.
2. Photorespiration.
3. Principle of limiting factors.
4. Photolysis of water.

Q. Short answer type questions.
Describe the carbonic acid exchange theory for absorption of mineral salts by plants

Q. The theory which suggests that the CO${}_2$ produced in respiration plays an important role in mineral absorption is

1. Contact exchange theory
2. Carbonic acid exchange theory
3. Active absorption theory
4. None of the above

Q. Besides leucoplast, starch grain can develop in

1. Mitochondria
2. Chloroplast
3. Lysosome
4. Chromoplast

Q. RuBisco has active site that can bind carbon dioxide and __

Q. During photorespiration the oxygen consuming reaction (s) occur in:

1. Stroma of chloroplasts and mitochondria
2. Grana of chloroplasts and peroxisomes
3. Stroma of chloroplasts
4. Stroma of chloroplasts and peroxisomes

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 one of the following is wrong in relation to photorespiration?

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

Q. In plant cells, peroxisomes are associated with

1. Photoperiodism.
2. Photosynthesis.
3. Phototropism.
4. Photorespiration.