I (a) (i) epigeal
(ii) - cotyledons are above the ground
(b) (i) - positive hydrotropism in roots
- positive phototropism in shoot.
(ii) Positive phototropism
Light causes lateral migration of auxins away from the light side, towards the darker side;
high auxin concentration stimulates growth in the shoot ; thus the cells on darker side grew and
elongated faster than the cells on the illuminated side ; causing the curvature towards light;
(iii) Provides yield energy required by the cell for various functions;
Positive hydrotropism.
Water causes auxins to migrate towards the side with water / moisture, auxin, are positively
hydrotropic; low auxin concentration stimulates growth in roots, auxin high concentration
inhibit growth in roots; the cells on the side away from the water grow and elongated faster;
leading to curvature towards water.
(ii) Phototropism enables plants (shoot) to obtain optimum light for photosynthesis.
Hydrotropism by roots enables plants to absorb water and mineral salts for metabolic processes.
II (a) plate 6 - stamen plate 7 - pistil
(b) (i) dioecium
(ii) facilitates pollination leading to variation within the species and increase in hybrid vigour.
(c) (i) wind pollination
(ii) Small incospicuous bracts; that are dull coloured
(d) (i) cross pollination.
(ii) - male and female parts occur in different plants.
- the plant pollen grains are sterile to the stigma of the same plant.
sharon kalunda answered the question on May 27, 2019 at 10:50
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