Human Reproduction — BIOLOGY STD 12 Science — Question

How is diapause different from hibernation?

If origin of life is in progress in any other planet, what would be the condition there?

Name the cells that nourish the germ cells in the testes. Where are these cells located in the testes?

Differentiate between pollination and fertilization is angiosperms.

A heavily bleeding and bruised road accident victim was brought to a nursing home. The doctor immediately gave him an injection to protect him against a deadly disease.

1. Write what did the doctor inject into the patient's body.
2. How do you think this injection would protect the patient against the disease?
3. Name the disease against which this injection was given and the kind of immunity it provides.

Is an aquarium a complete ecosystem?

What is aneuploidy? Differentiate between trisomic and triploid condition? Name any one trisomic condition found in human.

A vector is engineered with three features, which facilitates its cloning within host cell. List three features and explain each one of them.

Kanchan went to a garden and saw some flowers which were closed. She assumed that those flowers must be buds. But she was astonished to see that all the flowers of that plant were closed and none of them was open. She was confused and asked her queries to her teacher.

1. What do you think, are there any plants with closed flowers? Give an example.
2. Are such plants get pollinated? Explain.
3. What are such flowers/ plants called?
4. What values are shown by Kanchan?