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

Define analogous organ. Give one example of an organ analogous to human hand.

Name the units of vegetative propagation in water hyacinth. Explain giving reasons why it has become the most invasive aquatic weed.

Fed up of a large family, a couple wanted to adopt a terminal method of contraception. Describe the process conducted by the doctor in either of the cases (male/female partner).

Compare the two ecological pyramids of biomass given below and explain the situations in which this is possible. Also, construct an ideal pyramid of energy, if 200,000 joules of sunlight is available.

Unsing a Punnett Square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.

1. On seeing bad state of roads in your locality, as a student, you have recommended to the Municipal corporation to use polyblend.

1. What is poly blend? Point out its raw material.
2. How will it be advantageous?

2. What are e-wastes? Explain the method of their disposal.

1. Why are the plants raised through micropropagation termed as somaclones?
2. Mention two advantages of this technique.

Describe the chemical methods of birth control.

During the secondary treatment of the primary effluent how does the significant decrease in BOD occur?
OR
During the secondary treatment of the primary effluent how does the significant decrease in BOD occur?

Why is it that during changing weather, one is advised to avoid closed, crowded and airconditioned places like cinema halls etc.?