Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

What is it that prevents a child to suffer from a disease he/ she is vaccinated against? Give one reason.

Write the physiological reason, why a woman generally cannot conceive a child after 50 years of age.

What are chorionic villi?

Why were protein discarded from being the genetic material?

Name the group of organisms and the substrate they act on to produce biogas.

How do neutrophils act as a cellular barrier to pathogens in humans?

What is the difference between endemic and exotic species?

It was confirmed by a doctor that the immune system of a person's body has been blocked. Which disease does the person have and what is its cause?

Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral DNA. How is it possible?

Given below are the stages in human reproduction. Write them in correct sequential order.
Insemination, Gametogenesis, Fertilisation, Parturition, Gestation, Implantation