BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Unequal distribution of auxin causes phototropism . It causes the plant growth either away or towards the light, based on which part receives light. Auxins are present in higher quantities on the shaded side of a stem. Since auxins promote stem elongation, the shaded part grows taller.

Detailed explanation-2: -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-3: -Light imposes a high degree of control on auxin levels and distribution but its action is not restricted to these processes; light also moderates the sensitivity to auxin within the cell. By imposing control on the nuclear auxin response pathway, light can dampen or amplify the response to auxin.

Detailed explanation-4: -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-5: -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.