Assertion: Photosynthetically C₄ plants are less efficient than C3 plants.

Reason: The operation of C₄ pathway requires the involvement of only bundle-sheath cells.

• 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 falsen

• If both assertion and reason are false.

The sugarcane plant has

• dumb-bell shaped guard cells

• pentamerous flowers

• reticulate venation

• capsular fruits.

Assertion : C₄ photosynthetic pathway is more efficient than the C₃ pathway.

Reason : Photorespiration is suppressed in C₄ plants.

• If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false

Assertion : The atmospheric concentration of CO₂ at which photosynthesis just compensates for respiration is referred to as CO₂ compensation point. 

Reason : The CO₂ compensation point is reached when the amount of CO₂ uptake is less than that generated through respiration because the level of CO, in the atmosphere is more than that required for achieving CO₂ compensation point.

• If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false

Photorespiration in C₃ plants starts from:

• phosphoglycerate

• phosphoglycolate

• glycerate

• glycine

Hill reaction occurs in:

• high altitude plants

• total darkness

• absence of water

• presence of ferricyanide

Which one of the following pairs is correctly matched?

• Rhizobium - Parasite in the roots of leguminous plants

• Mycorrhizae - Mineral uptake from soil

• Yeast - Production of biogas

• Myxomycetes - The disease ring worm

Assertion : Rhoeo leaves contain anthocyanin pigments in epidermal cells.

Reason : Anthocyanins photosynthetic pigments.

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

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

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

109.

Stomata open at night and closes during day in

• xerophytes

• gametophytes

• mesophytes

• mesophytes

During photosynthesis

• both CO₂ and water get oxidized

• both CO₂ and water get reduced

• water is reduced and CO₂ is oxidized

• CO₂ gets reduced and water gets oxidized