Which one of the following is resistant to enzyme action? 

• Cork 

• Wood fibre

• Pollen exine

• Leaf cuticle

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

• Manganese and Chlorine

• Manganese and Potassium

• Magnesium and Molybdenum

• Magnesium and Chlorine

In photosystem-I, the first electron acceptor is

• Ferredoxin

• Cytochrome

• Plastocyanin

• An iron sulphur protein

Read the following four statements:
I. Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.
II. In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth.
III. Stamens in flowers of Gloriosa and Petunia are polyandrous.
IV. Symbiotic nitrogen fixers occurs in free-living state also in soil. 
How many of the above statements are right 

• Two

• Three

• Four

• One

In Kranz anatomy, the bundle sheath cells have

• thin walls, many intercellular spaces and no chloroplasts

• thick walls, no intercellular spaces and a large number of chloroplasts

• thin walls, no intercellular spaces and several chloroplasts

• thick walls, many intercellular space and few chloroplasts