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

Which two major groups of organisms make up the bulk of decomposers?

Name any two opiate narcotics.

If the frequency of a parental form is higher than 25% in a dihybrid test cross, what does that indicate about the two genes involved?

In a flower, the megaspore mother cell of an ovule forms megaspores by mitosis. If one of these megaspores develops into the embryo sac, what will be the ploidy of its (eight) nuclei?

Mention any one major source of variation in a sexually reproduced offspring.

In the year 1963, two enzymes responsible for restricting the growth of bacteriophage in E.coli were isolated. How did the enzymes act to restrict the growth of the bacteriophage?

From which germ layers do the following organs differentiate?

1. Kidney.
2. Urinary bladder.

In which year, a national level approach to build up a reproductively healthy society was taken up in our country?

Give an example for:
An organism of benthic zone

Name the embryonic stage that gets implanted in the uterine wall of a human female.