1.  10

2.  20

4.  None of these

1.  only (a)

3.  both a and (b)

4.  both b and (c)

1.  Movement of solvent molecules will take place from chamber X to Y

3.  Presence of a semipermeable is a pre- requisite for this process to occur

4.  The direction and rate of osmosis depends on both the pressure gradient and concentration gradientans:

2.  b.Elaioplasts                               (ii)store oils or fats

3.  c.Chloroplasts                            (iii)contain chlorophyll pigments other than chlorophyll

4.  d.Leucoplast                               (iv)contains colourless pigments

1.  Being a component of biomolecules

3.  Being a structural components of energy related chemical compounds

4.  Activation or inhibition of enzymes

2.   Essential element concentration below which plant growth becomes stunted

3.  Essential element concentration below which plant remains in the vegetative phase

4.  None of the above

2.  Magnesium

3.  Nitrogen

4.  Potassium

1.  Calcium translocation in shoot apex is inhibited

3.  Appearance of brown spot surrounded by chlorotic veins

4.   None of the above

1.  Step (i) is carried out by nitroso-monas or nitrococcus

2.  Step (ii) is carried out by nitrobacter

3.  Both steps (i) and (ii) can be called nitrification

1.  Step (i) is carried out by nitroso-monas or nitrococcus

2.  Step (ii) is carried out by nitrobacter

3.  Both steps (i) and (ii) can be called nitrification