The plant group in which stomata opens in night is

• mesophytes

• succulents

• hydrophytes

• None of the above

142.

Chlorophyll- a is characterized by the side group

• methyl

• aldehyde

• phytol

• ketone

Photorespiration takes place in plants where carbon fixation occurs through

• Calvin cycle

• Hatch and Slack cycle

• Glycolysis

• Krebs' cycle

Blackman's law of limiting factor is applied to

• respiration

• transpiration

• photorespiration

• photosynthesis

In sugarcane plant, ¹⁴CO₂ is fixed in a malic acid, in which the enzyme that fixes CO₂ is

• ribulose phosphate kinase

• fructose phosphatase

• ribulose biphosphate carboxylase

• phosphoenol pyruvic acid carboxylase

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

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⁺