121.

In a CAM plant, the concentration of organic acid

• increases during the day

• decreases or increases during the day

• increases during night

• decreases during any time

Chloroplast dimorphism is a characteristic feature of

• plants with Calvin cycle

• C₄ -plants

• all plants

• only in algae

In which type of reactions related to plant photosynthesis peroxisomes are involved?

• Glycolate cycle

• Calvin cycle

• Bacterial photosynthesis

• Glyoxylate cycle

Example of water soluble plant pigment is

• chlorophyll- a

• chlorophyll- b

• anthocyanin

• xanthophyll

Identify the membrane across which the proton (H⁺) gradient facilitates ATP synthesis in a typical eukaryotic cell

• plasma membrane

• mitochondrial inner membrane

• mitochondrial outer membrane

• nuclear membrane

Chlorophyll molecules are located in the

• thylakoid membrane

• thylakoid lumen

• stroma

• inner chloroplast membrane

The correct sequence of organelles in which glycolate and glyoxylate are produced sequentially in photorespiration is

• chloroplast and mitochondria

• chloroplast and peroxisome

• peroxisome and mitochondria

• peroxisome and chloroplast

Identify the correct statements in relation to C₄ photosynthesis.

• Kranz anatomy is an essential feature for C₄ plants

• C₄ plants have higher water use efficiency than C₃ plants

• Photorespiration can be minimised when C₃ pathway is in operation

• Conversion of oxaloacetate to malate occurs in the bundle sheath cells

C₄ pathway is advantageous over C₃ pathway in plants as it

• occurs in relatively low CO₂ concentration

• uses more amount of water

• occurs in relatively low O₂ concentration

• is less efficient in energy utilisation

Opening and closing of stomata is controlled by

• abscisic acid

• CO₂ concentration

• O₂ concentration

• light intensity