Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

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.

1. What are transgenic animals?
2. Name the transgenic animal having the largest number amongst all the existing transgenic animals.
3. Mention any three purposes for which these animals are produced.

While on a visit to a pond in the city-neighbourhood, the visitors were delighted to find large expanse of water covered with colourful algal mass.

1. As a student of biology, do you agree with their delight? Give reasons in support of your answer.
2. Explain the cause of such algal growth.

1. Write the desirable characters a farmer looks for in his sugarcane crop.
2. How did plant breeding techniques help north Indian farmers to develop cane with desired characters?

Write a short note on
Effects of temperature or water scarcity and the adaptations of animals

Describe hypertension - Add a note on angina pectoris.

hCG [human chorionic gonadotropin].

Through which modes HIV infection does not spread?

Give an account of poultry diseases.

Explain the causes of global warming. Why is it a warning to mankind?