Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Give any two reasons why the patent on Basmati should not have gone to an American Company.

What are decomposers? What is their function in ecosystem?

Explain the increase in the numbers of melanic (dark winged) moths in the urban areas of post-industrialisation period in England.

Differentiate between the following:

Repetitive DNA and Satellite DNA.

Write any four main features of the structure of double helical DNA.

Explain adaptive radiation. (Figure is not necessary)

Name the categories of organisms used as biofertilisers with an example for each. How do they function in organic farming?

Sperms have a tail, whereas eggs do not. Why?

 In which phase of menstrual cycle is corpus luteum formed?

Community service department of your school plans a visit to a slum area near the school with an objective to educate the slum dwellers with respect to health and hygiene.

1. Why is there a need to organise such visits?
2. Write the steps you will highlight as a member of this department, in your interactions with them to enable them to lead a healthy life.