Which one of the following is wrong in relation to photorespiration?

• It is a characteristic of C₄ -plants

• It is a characteristic of C₃ -plants

• It occurs in chloroplasts

• It occurs in daytime only

Stomata of CAM plants

• open during the night and close during the day

• never open

• are always open

• open during the day and close at night

Boron in green plants assists in

• photosynthesis

• sugar transport

• activation of enzymes

• acting as enzyme cofactor

254.

Who proved that oxygen evolved in photosynthesis comes from water?

• Mayer

• Calvin

• Ruben, Hassid and Kamen

• Blackman

Stomata open or close due to the ion

• Ca²⁺

• Na⁺

• K⁺

• Cu⁺

The specific character of C₄  plants is

• bulliform cells

• Kranz anatomy

• parallel venation

• isobilateral leaf

In CAM plants, CO₂ acceptor is

• RuBP

• PEP

• OAA

• PGA

Law of limiting factor was given by

• Leibig

• Blackman

• Calvin

• Arnon

Which one of the following contain agranal chloroplasts?

• C₃ plants

• Succulants

• C₄ plants

• Hydrophytes

For synthesis of one hexose sugar, how many times Calvin cycle is turned ?

• 12

• 2

• 6

• 3