Draw a neat, labelled diagram of an animal cell showing the Prophase stage of Mitosis with four chromosomes.

Differentiate between Mitosis in plant cell and animal cell based on Cytokinesis.

Which is the resting but metabolically active stage of the cell cycle?

Mention the number of Autosomes and Allosomes in a human body cell.

The diagram given below represents a stage in mitosis. (a) Identify the stage given above. (b) Give one reason to support your answer in (a). (c) Mention the number of chromosomes given in the diagram.

Draw a neat, labelled diagram of an animal cell showing Metaphase with four chromosomes.

What is the structure of DNA as proposed by Watson and Crick?

Duplicated chromosomes are joined at a point termed: (a) Centrosome (b) Centromere (c) Centriole (d) Chromatid

Expand the abbreviation — DNA.

Read the explanations given below and name the structures: (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.

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

Differentiate between Karyokinesis and Cytokinesis.

A male gorilla has 48 chromosomes in each body cell. How many chromosomes will be present in each of its sperms? (a) 24 (b) 48 (c) 12 (d) 16