Reproduction in organisms — BIOLOGY STD 12 Science — Question

Explain the basis on which the gel electrophoresis technique works. Write any two ways the products obtained through this technique can be utilised.

What is the significance of ampullary–isthmic junction in the female reproductive tract?

What are interferons? How do interferons check infection of new cells?

Explain how biodiversity is important for human.

Discuss the mode of action and advantages/ disadvantages of hormonal contraceptives.

Discuss the genetic basis of wrinkled phenotype of pea seed.

How does a detritivore differ from a decomposer? Explain with an example each.

Prabha has seen huge garbage dumps outside your school which are not being regularly disposed of by MCD. Prabha discusses the problems with school mates and decide to organize rally to spread awareness among local people about public hygiene.
→ Prepare two slogans for rally
→ Name any two infectious diseases which may spread due to such unhygienic conditions at public place

What percent of all bird species and mammal species, respectively face the threat of extinction?

Bt cotton is resistant to pest, such as lepidopteron, dipterans and coleopterans. Is Bt cotton also resistant to other pests as well?