Biology : Photosynthesis in Higher Plants

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

As compared to sun plants, the plants, which are adopted to low light intensity possess

• more extended root system

• very high rate of CO₂ fixation

• larger photosynthetic units

• more extended shoot system

How many pigment molecules constitute a single photosystem?

• 2500

• 250-400

• 2000

• 2

Oxygen released in photosynthesis comes outby

• photophosphorylation

• photolysis of water

• photorespiration

• Kelvin cycle

Glycolate accumulates in chloroplast there is

• low CO₂

• high CO₂

• bright light

• low temperature

Which of the following inhibits O₂ release in light phase?

• Zeatin

• PMA

• DCMU

• None of these