2.1 Identify part: (a) A (b) B (c) H 2.1.2 Give the LETTER and NAME of the part of the ear that absorbs excess pressure waves from the inner ear - NSC Life Sciences - Question 2 - 2020 - Paper 1

B refers to the Medulla oblongata, which controls vital autonomic functions such as heart rate and respiration.

H refers to the Eustachian tube, which helps equalize pressure in the ear.

The part of the ear that absorbs excess pressure waves is represented by the letter G, which is known as the Round window.

The receptors found at part E are known as Hair cells, specifically the Organ of Corti.

Damage to part B (Medulla oblongata) can be fatal because it controls essential functions such as heartbeat and respiration. Any severe injury can disrupt these vital processes, leading to instant death.

For distant vision, the ciliary muscle is relaxed, causing the ciliary body/choroid layer to move backward and away from the lens. The suspensory ligaments become tight, increasing the tension on the lens, making it less convex and flatter. As a result, light rays are refracted less, ensuring a clear image falls on the retina at the yellow spot.

The apical bud was placed on a block of agar jelly for 2 hours to allow plant hormones (auxins) to diffuse into the agar jelly, which can then affect plant growth when the agar is applied to the other plant.

For plant 1, the results indicated that the stem stopped growing upwards and did not develop lateral branches due to the sealing with petroleum jelly, which inhibited the movement of auxins.

Fruit farmers can use this knowledge to control the growth patterns of their plants. By manipulating auxin distribution, they can encourage the development of more lateral branches, which may allow for a greater yield of fruit.

The stem in pot plant 2 grew upwards because the plant was exposed to increased levels of auxins from the agar jelly, which promotes upward growth and lateral branching, enhancing fruit production.