(a). Name the gases involved in the photosynthesis of a plant.
(b) State one role each of the gases named in 2 (a).
(c) (i) What is a variegated leaf?
(ii)Which part of the variegated leaf would test positive when treated with iodine solution?
(iii) State two reason for the answer in 2(c) (ii).
(iv) Name one mineral element required by plants for the formation of the part that would test positive in 2(c)(ii).
(d) The table below indicates different methods by which organism obtain food. Place the following organism under the heading in the table below: Human, Mushroom, Venus flytrap, Waterleaf plant, Tapeworm, Elephant grass, Housefly, Lichen, Spirogyra, Rhizopus.
| Holozoic | Parasitic | Symbiotic | Saprophytic | Autotrophic |
Explanation
(a) Gases involved in the photosynthesis of a plant
- Carbon dioxide/Carbon (IV) oxide
- Oxygen
(b) Role of gases involved in photosynthesis
(i) Carbon dioxide/Carbon (IV) oxide: raw material for photosynthesis/to produce glucose/starch
(ii) Oxygen: by-product/given off during photosynthesis.
(c) Variegated leaf
(i) A leaf with different colour parts/patches/green and non-green parts.
(ii) Part of variegated leaf that would be positive when treated with iodine solution The green part/patch
(iii) Reasons for the answer in 2(c) (ii)
Presence of chlorophyll/chloroplast; for trapping solar energy; to manufacture starch; which turns blue-black with iodine solution
(iv) Mineral elements used to manufacture chlorophyll
Magnesium/iron/nitrogen.
(d)
| Holozoic | parasitic | symbiotic | saprophytic | Autotrophic |
| Human | Tapeworm | Lichen | mushroom | water leaf plant |
| Housefly | Rhizopus | Elephant grass | ||
| Venus flytrap | Spyrogyra | |||
| Venus flytrap |