Organisms and Populations — BIOLOGY STD 12 Science — Question

Name any two organisms which occupy more than one trophic level in an ecosystem?

Name the Following : Mutant variety of rice.

Who won the Nobel Prize for the discovery of Penicillin?

Cervix contains the largest and the strongest sphincter in its wall. Give reason.

Pusa Komal variety of cowpea resistant to which disease?

What is hybrid?

Mark the odd one in the following group.
Earthworms, Sponges, Cockroaches, Tapeworms.

Who discovered mycorrhizae?

Why do we add an inoculum of curd to milk for curdling it?
OR
Why is 'starter' added to set the milk into curd? Explain.

OR
During the production of curd, a small amount of curd is added as a starter to the fresh milk at a suitable temperature. Explain the changes the milk undergoes when it sets into the curd.

OR
Why is a little curd added to milk to set it into curd? Explain.

Name the three branches of trigeminal nerve.