Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Name the type of pollination taking place in coconut palms. List five characteristics of the flowers of coconut plant favouring this type of pollination.

What are satellite DNA in a genome? Explain their role in DNA fingerprinting.

GM Plants are useful in many ways. How would you convince the farmers to grow GM plants in their fields? Explain giving three reasons.
OR
People are quite apprehensive to use GM crops. Give three arguments in support of GM crops so as to convince the people in favour of such crops.

Study the graph given below and answer the question that follow:

1. Write the status of food and space in the curves (a) and (b).
2. In the absence of predators, which one of the two curves would appropriately depict the prey population?
3. Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line.

Your classmate complains of headache and cough. The doctor confirms that he is suffering from Pneumonia and not common cold, on the basis of certain symptoms. List these symptoms. Mention any two precautions to be followed to prevent the spread of this disease.

What is parturition? Which hormones are involved in induction of parturition?

Describe about the exaggerated response of immune system to certain antigen present in the environment

What is Saheli? Write any three differences between Saheli and Multiload 375.

What is a recombinant DNA vaccine? Give two examples.

Look at the figure below depicting lac operon of E.coli.

i. What could be the series of events when an inducer is present in the medium in which E.coli is growing?
ii. Name the inducer.