Read the explanations given below and name the structures:

Example: The tubules which produce sperms.

Answer: Seminiferous tubules

(a) The canal through which the testes descend down into the scrotum just before the birth of a male baby.

(b) The part of the brain that regulates the peristaltic movement of the alimentary canal.

(c) A structure that collects the soundwaves and conducts them through the external auditory canal.

(d) The point of attachment of two chromatids of a chromosome.

(e) Regulation of the opening and closing of stomata.

Given below is an outline of the human body showing the important endocrine glands. Match the glands marked (a) to (e) with their correct functions:

Example: (f) – 6. Secretes Testosterone.

Ramesh is a farmer who has a vineyard and cultivates grapes. To improve the shape of the grapes and make them elongated he sprays a particular phytohormone at the time of fruiting.

(a) Name the phytohormone that Ramesh sprays on the plant at the time of fruiting.

(b) These grapes are said to be seedless. What is the technical term for the formation of such fruits?

Mention the two pairs of nitrogenous bases that are present in a DNA strand and pair with each other by hydrogen bonds.