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

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

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

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

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.

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

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

Expand the abbreviation — DNA.

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

Name the following: (i) The organelle that forms the aster during cell division. (ii) A genetic disorder in which the blood does not clot. (iii) The permanent stoppage of menstruation in human females around the age of 45 years. (iv) The openings on the barks of trees through which transpiration occurs. (v) A gaseous plant hormone which promotes ripening of fruits.

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.