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

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