Question Bank [2022] — BIOLOGY STD 12 Science — Question

In a certain group of insects, some have 17 chromosomes and some have 18 chromosomes. Write about the gender of these two types of insects.

It was diagnosed by a specialist that the immune system of the body of a patient has been suppressed. Name the disease the patient has been suffering from and its causative agent.

Name two plants whose genomes have been sequenced.

Write the probable differences in eating habits of Homo habilis and Homo erectus.

Identify 'A' in the figure showing a stage of embryonic development in a dicot plant and mention its function.

Expand the following:

1. cDNA.
2. Bt.

Indiscriminate diagnostic practices using X-rays etc. Should be avoided. Give one reason.

Which mutation can result in insertion or deletion of amino acids, but reading frame remains unaltered?

Till what time does the climax community remain stable?

Name the band of nerve fibres that connect cerebrum, cerebellum and spinal cord.