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Photosynthesis in Higher Plants

Multiple Choice Questions

131.

As compared to sun plants, the plants, which are adopted to low light intensity possess

more extended root system
very high rate of CO₂ fixation
larger photosynthetic units
more extended shoot system

132.

How many pigment molecules constitute a single photosystem?

2500
250-400
2000
2

133.

Oxygen released in photosynthesis comes outby

photophosphorylation
photolysis of water
photorespiration
Kelvin cycle

134.
Glycolate accumulates in chloroplast there is

low CO₂

high CO₂

bright light

low temperature

low CO₂

Glycolate is a respiratory substrate in photo respiration, which is formed in high concent ration of O₂ but low concentration of CO₂ under the influence of RuBP oxygenase in chloroplast. When temperature and CO₂ content are high the affinity of RuBP carboxylase increases for O₂ but decreases for carbondioxids. Glycolate is produced as intermediate in C₃ cycle.