Organisms and Populations — BIOLOGY STD 12 Science — Question

Classify the following diseases under the headings 'transmissible and 'non-transmissible'. Lung cancer, whooping cough, rickets, arthritis, appendicitis, food poisoning, tuberculosis, measles, diabetes, anaemia, syphilis, influenza, AIDS, coronary heart disease and haemophilia.

What are hallucinogens? Give their two examples. Mention their clinical use, if any.

Apomixis resembles asexual reproduction, as well as mimics sexual reproduction in plants. Explain with the help of a suitable example.

“Pollen grains in wheat are shed at 3-celled stage while in peas they are shed at 2-celled stage.” Explain. Where are germ pores present in a pollen grain?

Why are coral reefs not found from West Bengal to Andhra Pradesh but found in Tamil Nadu on the east coast of India?

Name the organic materials the exine and intine of an angiosperm pollen grains are made up of. Explain the role of exine.

Who proposed the famous double stranded helical structure of DNA?

Distinguish between
Production and decomposition.

When do the oogenesis and the spermatogenesis initiate in human females and males respectively?

Write about the names and five classes of antibody.