Photorespiration

Q.

Rubisco:

1. catalyzes the reduction of two molecules of PGAL to form glucose.

2. a and b but not c

3. initiates photorespiration when the CO2/O2 ratio is low.

4. catalyzes the carboxylation of CO2 to ribulose 1, 5-bisphosphate

Q. The property of RuBisCO which is responsible for photorespiration in $C_3$-plants is its activity as

1. Oxygenase
2. Dehydrogenase
3. Decarboxylase
4. Carboxylase

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

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

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

Q. The first reaction in photorespiration is _____.

1. Carboxylation

2. Decarboxylation

3. Oxygenation

4. Phosphorylation

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

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

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.

RUBISCO enzyme is also called as

1. Carboxytetra mutase

2. Carboxydismutase

3. Carboxytrimutase

4. Carboxyunimutase