Environmental Issues — BIOLOGY STD 12 Science — Question

What determines the type of benthic animals in an aquatic ecosystem?

Name the basic requirement of any ecosystem to function and sustain.

Explain what is meant by metastasis.

Mention the position of the ribonucleotide, where the OH group is present.

1. How do ladybird beetles and dragon flies act as biocontrol agents?
2. Mention the constituents of 'flocs'.

Expand LSD. Name its source organism. What category of drug is it?

Define heterosis.

Write one example each of dominant and recessive chromosomal mendelian disorders in humans.

In a pond, there were 200 frogs. 40 more were born in a year. Calculate the birth rate of the population of frogs in the pond.

Name the interaction that exists between sucker fish and shark.
OR
Name the type of interaction that exists between barnacles and whale.

OR
Comment on the interaction between a clown fish living among the tentacles of a sea anemone.