Reproductive Health — BIOLOGY STD 12 Science — Question

Draw a pyramid of biomass and pyramid of energy in sea. Give your comments on the type of pyramids drawn.

Explain biodiversity loss due to alien species invasions.###Among the reasons of biodiversity loss, how does extinction of indiginous species is carried out by invation of allian species? Explain.

Name the group of bacteria involved in setting milk into curd. Explain the process they carry in doing so. Write another beneficial role of such bacteria.

How do antibiotic-resistance genes function as selectable markers? Explain with the help of E.coli cloning vector pBR 322.

Explain the various steps involved in the production of artificial insulin.

Amazonian rain forest has the greatest biodiversity on earth. List any two hypothesis that are proposed by the biologists to account for the greater biological diversity.

Identify the figure given alongside.

When do you describe the relationship between two organisms as mutualistic, competitive and parasitic? Give one example of each type.

What is primary productivity? Give brief description of factors that affect primary productivity.

1. Mention the specific geographical region where these organisms are found.
2. Name and explain the phenomenon that has resulted in the evolution of such diverse species in the region.
3. Explain giving reasons the existence of placental wolf and Tasmanian wolf sharing the same habitat.