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 regulates vital bodily functions such as heart rate and respiration.

H refers to the Eustachian tube, which is responsible for equalizing pressure in the middle ear.

The part of the ear that absorbs excess pressure waves is identified as G, the Round window.

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

Damage to part B, the Medulla oblongata, can lead to instant death because it controls essential functions such as heartbeat and respiration. Any impairment to this area can disrupt life-sustaining physiological processes.

For distant vision, the ciliary muscle relaxes, causing the ciliary body and choroid layer to move backward and away from the lens. As a result, the suspensory ligaments are tight, increasing tension on the lens. Consequently, the lens flattens and its curvature decreases, allowing light rays to be refracted less, thus forming a clear image on the retina.

The apical bud was placed on a block of agar jelly for 2 hours to allow the plant hormones (auxins) to diffuse into the jelly, which would facilitate the examination of their effects on the plant's growth.

For plant 1, where petroleum jelly was applied, the stem stopped growing upwards, and hence no lateral branches developed.

Farmers can use this knowledge by applying auxins to stimulate lateral branch development, resulting in enhanced fruit production. By controlling the distribution of plant hormones, farmers can optimize the yield and manage the growth patterns of their crops.

The stem in pot plant 2 grew upwards because the apical bud was allowed to produce auxins that encourage vertical growth. Unlike pot plant 1, where the apical bud was sealed, the absence of restriction in pot plant 2 promoted upward growth.