BIOLOGY

SCIENCE Paper – 3

SECTION I (40 Marks)

Question 1

(a) Name the following:
(i) The respiratory pigment found in erythrocytes.
(ii) The organ that produces urea.
(iii) The part of the chloroplast where the light reaction of photosynthesis takes place.
(iv) The Vehicular Standard for controlling air pollution.
(v) The part of the ovary that produces progesterone. [5]

(b) State whether the following statements are true or false. If false, rewrite the correct form of the statement by changing the first word only:
(i) Cones are photoreceptor cells that are sensitive to dim light.
(ii) The Beta cells of the pancreas secrete insulin.
(iii) Tubectomy is the surgical method of sterilization in man.
(iv) Guttation is the loss of water in the form of water droplets from hydathodes.
(v) Nephrons are the basic unit of the brain. [5]

(c) Give technical terms for the following:
(i) Plasma devoid of fibrinogen.
(ii) Movement of water molecules across the cell membrane from hypertonic to hypotonic solution.
(iii) The stage where chromosomes lie on the equator of the achromatic spindle.
(iv) Alternative form of a gene on a pair of homologous chromosome.
(v) Period of complete intrauterine development of the foetus. [5]

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