Control and Coordination in Plants and Animals Test - 2

Vagus nerve controls sound production. It supplies the muscles of larynx.

Chewing is a voluntary action, not a reflex action. Through the process of mastication or chewing, teeth physically break down the tough tissues of meats and fibres of plants into smaller particles.

During depolarisation, permeability of neuron increases towards Na+, which changes the electrochemical gradient, which in turn produces a further rise in the membrane potential. This then causes more channels to open, producing a greater electric current across the cell membrane, and so on.

The eye ball is moved by 6 muscles.

Four of the extraocular muscles control the movement of the eye in the four cardinal directions - up, down, left and right. The remaining two muscles control the adjustments involved in counteracting head movement. This can be observed by looking into one's own eyes in a mirror while moving one's head.

Gibberellic acid is the hormone which promotes internodal elongation. It can stimulate rapid stem and root growth, induce mitotic division in the leaves of some plants and increase seed germination rate.

Cytokinins are known to delay senescence in leaf tissues and promote mitosis. Cytokinins act in concert with auxin, another plant growth hormone. The two are complementary, having generally opposite effects.

2,4-D is a synthetic plant hormone. It is a synthetic auxin (plant hormone) and one of the most widely used herbicides in the world.

Endocrine glands are those glands which secrete their fluids into blood through ECF. The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.

Prohormones are inactive form of hormones. Though not hormones themselves, prohormones amplify the effects of existing hormones.

The largest endocrine gland is thyroid gland where as pancreas are largest heterocrine gland of the body.