Human Health and Disease — BIOLOGY STD 12 Science — Question

Name the scientist who developed the PCR technique.

Why is the gene encoding for ‘Cry’ protein inserted into a crop plant?

Climax stage is achieved quickly in secondary succession as compared to primary succession. Why?

What do you mean by panspermia?

The diagram shows the female reproductive system. Where do fertilisation and implantation occur?

State anyone reason to explain why RNA viruses mutate and evolve faster than other viruses?

A structural gene has two DNA strsnds X snd y shown above. Identify the template strand.

In the United States, the total number of STDs of bacterial origin remains about the same each year, but the total number of STDs of viral origin increases each year. Explain the reason for this.

Define species diversity and species richness.

Define adolescence.