Ecosystems — BIOLOGY STD 12 Science — Question

During a visit to Vaishno Devi, Rahul came across a young couple staying in the adjacent room in the hotel. He learnt that the couple had been visiting different temples and performing rituals to get a child. Rahul was astonished and explained to them about ART which he had recently studied in their wrong approach and thanked Rahul.

1. What is ART? What are the various methods included in ART?
2. What are the limitations for which ART is not commonly accepted?
3. Identify the values which Rahul showed.

What is disturbance in Hardy-Weinberg genetic equilibrium indicative of? Explain how it is caused.

Suggest a possible explanation why the seeds in a pea pod are arranged in a row, whereas those in tomato are scattered in the juicy pulp.

A person has to perform crosses for the purpose of studying inheritance of a few traits/ characters. What should be the criteria for selecting the organisms?

What is red list? Give two uses of red list.

Study the given pedigree chart and answer the questions that follow:

1. Is the trait recessive or dominant?
2. Is the trait sex-linked or autosomal?
3. Give the genotypes of the parents shown in generation I and their third child shown in generation II and the first grandchild shown in generation III.

How many types of restriction endonucleases are found. Why they are called as molecular scissors?

Explain the role of the enzyme EcoRI in recombinant DNA technology.

On a visit to a Hill station, one of your friend suddenly become unwell and felt uneasy.

1. List two symptoms you would look for to term it to be due to allergy.
2. Explain the response of the body to an allergen.
3. Name two drugs that can be recommended for immediate relief.

Name the two end products of double fertilization in angiosperms. How are they formed? Write their fate during the development of seed.