BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Unequal distribution of auxin can cause unequal growth rates in plants and shoots. Auxins change the rates of elongation in plant cells and control growth of stems and roots. Stems and roots respond differently to high concentrations of auxins: cells in stems grow more.

Detailed explanation-2: -Auxin in particular tells individual cells to reach out and grow longer, like Stretch Armstrong. It’s one of the ways that plants grow taller. Normally, plants growing with an unshaded light source will grow straight up towards the sun because auxin is evenly distributed all around the shoot.

Detailed explanation-3: -Auxin regulates plant growth. It stimulates cell elongation in stems. Auxins also play a role in cell division and differentiation, in fruit development, in the formation of roots from cuttings. Thus, the correct option is D) All of the above.

Detailed explanation-4: -At the tip of the shoot, the higher concentration of auxin at the bottom side will cause elongation faster so the shoot bends upwards. At the tip of the root, the higher concentration of auxin at the bottom side inhibits cell elongation and causes the root to bend downwards.