[5 marks Questions]

Question 15 Marks

i. Distinguish between hormonal co-ordination in plants and animals.
ii. Which part of the brain is responsible for -
1. intelligence
2. riding a bicycle
3. vomiting
4. controlling hunger
iii. How is brain and spinal-cord protected against mechanical injuries?

Answer

Hormonal coordination in Plants	Hormonal coordination in Animals
(1) By simple diffusion	Transported through blood to the target organ.
(2) No specialised glands involved.	Hormone released by Endocrine glands.

ii. 1. Cerebrum/forebrain
2. Cerebellum/hindbrain
3. Medulla/hindbrain
4. Hypothalamus/forebrain.
iii. Brain is protected I - Bony box/skull/cranium/fluid filled balloon in skull, Spinal cord is protected in - Backbone/Vertebral column.

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Question 25 Marks

i. Explain by giving one example each:
a. Unisexual flowers
b. Bisexual flowers
ii. Name the labelled parts A, B, C and D in the diagram given below.

iii. Pollination may occur without fertilisation but fertilisation will not take place without pollination. Give reason to justify this statement.

Answer

i. Unisexual flowers have either stamens or carpels but not both.
Fg - Papaya and watermelon
Bisexual flowers have both stamens and carpels. Here are some examples of each: eg - Hibiscus and mustard
ii. A - Pollen grain
B - Stigma
C - Pollen tube
D - Female germ cell
iii. Pollination may occur without fertilization but fertilization will not take place without pollination because pollination does not depend on fertilization but fertilization cannot take place without pollination because for fertilization to occur, it requires both male and female gametes.

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Science [5 marks Questions]

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