Question

1. State the importance of ecological factors to population of plant and animals (3 marks) Importance • They support metabolic activities: - Photosynthesis/nutrition - Respiration, etc • Supply of water is possible • Conducive environment for survival 2. i. Compare (a.) excretion and secretion S/No. Excretion Secretion Process of removal of waste Process of release of substances Waste products are released Useful products are released Involves substances like Urea, excess salts, water, CO2, etc Involves substances like enzymes, hormones, etc (b.) egestion and excretion (4 marks) S/No. Egestion Excretion Process of removal of undigested food Process of removal of waste substances Substances removed are not waste products but can be useful only that they are undigested Waste products are released which are no longer useful to man 3. State the excretory organs of the following organisms: crustaceans, fishes and amphibians. (3 marks) Crustaceans – green gland Fishes - kidney Amphibians - kidneys

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

1. importance of ecological factors to population of plant and animals

 a) They support metabolic activities: - Photosynthesis/nutrition -          Respiration, etc

b)  Supply of water is possible.

c) Conducive environment for survival.2.  (a) Comparision between  excretion and secretion

      Excretion Secretion Process of removal of waste Process of release   of substances Waste products are released Useful products are released Involves substances like Urea, excess salts, water, CO2, etc Involves substances like enzymes, hormones, etc

   

    (b) Comparision between egestion and excretion

        Egestion Excretion Process of removal of undigested food Process of removal of waste substances Substances removed are not waste products but can be useful only that they are undigested Waste products are released which are no longer useful to man

3. Excretory organs of :

      Crustaceans – green gland

      Fishes - kidney

     Amphibians - kidneys

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