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

PGA, as the first ${\mathrm{CO}}_2$ fixation product, was discovered in photosynthesis of
1. bryophyte
2. gymnosperm
3. angiosperm
4. alga

${\mathrm{C}}_4$ -plants are photosynthetically more efficient than ${\mathrm{C}}_3$ -plants because

In the leaves of ${\mathrm{C}}_4$ -plants, malic acid synthesis during ${\mathrm{CO}}_2$ fixation occurs in
1. epidermal cells
2. mesophyll cells
3. bundle sheath
4. guard cells

Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (A-E) make it useful as a storage material?
A. Easily translocated
B. Chemically non-reactive
C. Easily digested by animals
D. Osmotically inactive
E. Synthesized during photosynthesis
The useful properties are
1. (B) and (C)
2. (B) and (D)
3. (A), (C) and (E)
4. (A) and (E)

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is :