Human Health and Disease — BIOLOGY STD 12 Science — Question

Name the event, during cell division cycle that results in the gain or loss of chromosome.

Mention the common function that cotyledons and nucellus perform.
OR
Mention the common function that endosperm and perisperm perform.

Give definitions: Parturition

Identify the two correct statements from the following:

1. Apiculture means apical meristem culture.
2. Spinach is iron-enriched.
3. Green revolution has resulted in improved pulse-yield.
4. Aphids cannot infest rapeseed mustard.

What is humoral immunity?

What general term is given to the method in which the male partner withdraws his penis from the vagina just before ejaculation so as to avoid insemination?

Why is secondary immune response more intense than the primary immune response in humans?

In the pie chart (A) and (B) drawn below to show the global animal diversity, which group of animals would you name and write on the areas shaded back in (A) and (B). In which kind of habitat would you find these groups of animals?

What is the difference between tachycardia and bradycardia?

Explain the steps involved in the production of genetically engineered insulin.