The spinal cord originates from:

What is meant by hydrotropism? Give an example.

Name the plant hormones responsible for the following:
$(a)$ Elongation of cells
$(b)$ Growth of stem
$(c)$ Promotion of cell division
$(d)$ Falling of senescent leaves.

If a potted plant is kept horizontally for a few days,in which direction does the tender stem of the plant grow?

Which of the following hormones is secreted by the posterior pituitary gland?

Name various plant hormones and describe their physiological effects on plant growth and development.