In Hatch and Slack pathway

• chloroplast are of same type

• occurs in Kranz anatomy where mesophyll have small chloroplast whereas bundle sheath have granal chloroplast

• occurs in Kranz anatomy when mesophyll have small chloroplast where as bundle sheath have larger, agranal chloroplast

• Kranz anatomy where mesophyll cells are diffused

In Hatch and Slack type plants CO₂ acceptor is

• malate

• pyruvate

• phosphoenol pyruvate

• aspartate

In CAM plants

• stomata open in day and close at night

• stomata remain open in day and night both

• stomata remain closed in day and night both

• stomata open at night and close in day

In C₄ plants, CO₂ combines with

• phosphoglyceric acid

• ribulose diphosphate

• phosphoenol pyruvate

• phosphoglyceraldehyde

Photorespiration is favoured by

• high O₂ and low CO₂

• high CO₂ and low O₂

• high temperature and low O₂

• high humidity and temperature

The true statement about 'green-house effect' is that it is

• caused only by CO₂

• caused by CO₂, CFCs, CH₄ and NO₂ gases

• caused by combination of many gases

• none of the above

In C₄ plants, CO, fixation is done by

• mesophyll cells

• guard cells

• sclerenchyma

• chlorenchyma and hypodermis

178.

C₄ plants have better productivity because

• C₄ plants absorb more light

• C₄ plants absorb more CO₂

• C₄ plants lack photorespiration

• all of these

Assertion: Photorespiration is a wasteful process where there is no synthesis of ATP energy.

Reason: RuBisCO is present in mesophyll cells of C₄ plants hence they show more productivity.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

The 1st CO₂ fixation product of C₄ plant is

• Oxaloacetic acid

• ribulose biphosphate

• phosphoenolpyruvate

• phosphoglyceric acid.