Photosynthesis in Higher Plants

The scientist associated with the discovery of the Calvin cycle is:

1. Robert Hill
2. Melvin Calvin
3. Blackman
4. Joseph Priestley

Which factor does NOT directly affect the rate of photosynthesis?

1. Light intensity
2. Carbon dioxide concentration
3. Temperature
4. Soil colour

CAM plants open their stomata mainly during:

1. Morning
2. Afternoon
3. Night
4. Noon

During cyclic photophosphorylation, ATP is produced but there is no formation of:

1. ADP
2. Oxygen and NADPH
3. Water
4. Glucose

Which pathway is most efficient under high temperature and low carbon dioxide conditions?

1. C3 pathway
2. C4 pathway
3. Glycolysis
4. Krebs cycle

Kranz anatomy is characteristic of:

1. C3 plants
2. C4 plants
3. CAM plants only
4. Bryophytes

Photorespiration occurs because RuBisCO acts as:

1. Oxidase only
2. Carboxylase only
3. Both carboxylase and oxygenase
4. Hydrolase

Which enzyme catalyzes carbon fixation in the Calvin cycle?

1. ATP synthase
2. RuBisCO
3. PEP carboxylase
4. Catalase

The first stable product of the Calvin cycle is:

1. Oxaloacetic acid
2. Malic acid
3. 3-Phosphoglycerate (3-PGA)
4. Pyruvic acid

Which molecule acts as the primary carbon dioxide acceptor in C3 plants?

1. PEP
2. Oxaloacetic acid
3. RuBP
4. Pyruvate

The immediate product of photophosphorylation is:

1. Glucose
2. ATP
3. Starch
4. Sucrose

Which scientist proposed that oxygen released during photosynthesis comes from water?

1. Joseph Priestley
2. Cornelius van Niel
3. Jan Ingenhousz
4. Melvin Calvin

The oxygen released during photosynthesis comes from:

1. Carbon dioxide
2. Glucose
3. Water
4. Chlorophyll

Photosynthesis mainly occurs in which part of the chloroplast?

1. Outer membrane
2. Inner membrane
3. Grana and stroma
4. Nucleus

Which pigment is primarily responsible for photosynthesis in higher plants?

1. Chlorophyll b
2. Carotene
3. Xanthophyll
4. Chlorophyll a