(i) Pancreas secretes insulin
(ii) Glucose converted to glycogen in liver cells
(iii) Some
glucose converted to fat
(iv) Rate of
cellular respiration increases
(b) (i) Pancreas secretes glucagon
(ii) Liver
cells breaks down glycogen to glucose
(iii) Some
fats converted to glucose
(iv) Rate of
cellular respiration decreases
(c) (i)
Erector muscles relax to lower body hair
(ii)
Vasodilation
(iii) Sweat glands secrete sweat
(iv) Decrease
in metabolic rate
(d) (i) Erector muscles contract to raise body
hair to trap air
(ii)
Vasoconstriction
(iii) Skeletal muscles stimulated to cause shivering
(iv) Increase
in metabolic rate
Objective Pg 38-40
1. A 2.
B
3. B 4. A 5. A 6.
C 7. C 8. C 9. D 10. D 11. D 12. D 13. C
14. A 15. D
16. D 17.
B
Subjective Questions Pg 41-42
1. (a) (i)
X : Afferent neurone
Y :
Efferent neurone
(ii) X : Transmits impulses from receptors to
the central nervous system
Y :
Transmits impulses from the central nervous system to effectors
C (ii) When an impulse
reaches the synaptic knob, it causes the vesicle containing neurotransmitters to
move to the membrane and release the neurotransmitters. These neurotransmitters
diffuse across and attach to the membrane of the dendrite of the next neurone
which then stimulate the transmission of impulse.
2. (a) (i)
Auxin
(ii) To stimulate the growth of coleoptile and to enable
the coleoptile to respond to a stimulus
(b) In
Experiment 1, the presence of auxin in the tip of the shoot stimulates the
growth of the coleoptile. In Experiment 2, the growth is inhibited when the tip
of the shoot is cut.
C ii) Auxin stimulates
growth even when the tip is covered but it cannot pass through aluminium to
stimulate growth.
(d) The coleoptile grows straight upwards.
(e) (i) To stimulate the growth of adventitious roots
(ii) To stimulate the development of fruits
without fertilisation, i.e. parthenocarpy
