K.C.S.E Biology Q & A - MODEL 1999PP1QN12

K.C.S.E Biology Q & A - MODEL 1999PP1QN12

A student set up an experiment as shown in the diagram below..

a) i) What is being investigated in the experiment?
ii) On the diagram below indicate the expected results after three days.

​iii) Why was it necessary to have wet cotton wool in the containe?
b) What is the role of the following to a germinating seed/
i) Oxygen
ii) Cotyledons.

answers

​.a) i) Region of elongation (rapid) growth in a root.

• Region with more increase ink mark
• To provide moisture/water for growth 
• Region with more increase ink (mark)

ii) To provide moisture/water for growth (germination)

 b) i) Oxygen
Oxidation of stored food; to provide energy (for germination)
ii) Cotyledons
Store food necessary for germination; protecting the plumule.