Phosphoenol pyruvate (PEP) is the primary ${\mathrm{CO}}_2$ acceptor in
1. ${\mathrm{C}}_3$ -plants
2. ${\mathrm{C}}_4$ -plants
3. ${\mathrm{C}}_2$ -plants
4. ${\mathrm{C}}_3$ and ${\mathrm{C}}_4$ -plants

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of the following options.

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?

Emerson's enhancement effect and red drop have been instrumental in the discovery of
1. two photosystems operating simultaneously
2. photophosphorylation and cyclic electron transport
3. Oxidative phosphorylation
4. photophosphorylation and non-cyclic electron transport

In a chloroplast the highest number of protons are found in

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements are involved in this reaction?
1. Manganese and chlorine
2. Manganese and potassium
3. Manganese and molybdenum
4. Manganese and calcium

In photosynthesis, the light-independent reactions take place at

The structures that are formed by stacking of organised flattened membranous sacs in the chloroplasts are

Anoxygenic photosynthesis is characteristic of
1. Rhodospirillum
2. Spirogyra
3. Chlamydomonas
4. Ulva

The correct sequence of cell organelles during photorespiration is
1. chloroplast-golgi bodies-mitochondria
2. chloroplast-rough endoplasmic reticulum-dictyosomes
3. chloroplast-peroxisome-mitochondria
4. chloroplast-vacuole-peroxisome