Plant Water Relation — BIOLOGY STD 12 Science — Question

Give any two examples of biofortified transgenic crops.

Name any three types of premating isolating mechanisms.

A team of students are preparing to participate in the interschool sports meet. During a practice session, you find some vials with labels of certain cannabinoids.

1. Will you report to the authorities? Why?
2. Name a plant from which such chemicals are obtained.
3. Write the effect of these chemicals on human body.

What is meant by emasculation? When and why does a plant breeder employ this technique?

1. Name the causative agent of typhoid in humans.
2. Name the test administered to confirm the disease.
3. How does the pathogen gain entry into the human body? Write the diagnostic symptoms and mention the body organ that gets affected in severe cases.

Write a note on In-situ and Ex-situ conservation

State the function of catalytic converter in automobile. Name any two metals used in these converters.

Give reasons, why?

1. Cow dung is preferred for biogas production.
2. Saccharomyces cerevisiae is commonly known as baker's yeast.

Answer the following question.
Explain the histological structure of ovary in human.

What is repolarization and depolarization ?