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

What would happen to the successive trophic levels in the pyramid of energy, if the rate of reproduction of phytoplanktons was slowed down? Suggest two factors which could cause such a reduction in phytoplankton reproduction.

Suggest any four control measures of noise pollution.

Explain the Mendelian disorder Thalassemia.

What is active immunity?

With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?

Classify the following diseases under the headings 'transmissible and 'non-transmissible'. Lung cancer, whooping cough, rickets, arthritis, appendicitis, food poisoning, tuberculosis, measles, diabetes, anaemia, syphilis, influenza, AIDS, coronary heart disease and haemophilia.

Explain the sexual deceit found in orchid. ###Why shape, colour and markings of a petal of the Mediterranean orchid flower are similar to those of a female bumble bee? Explain.

A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.
Write the conclusion you draw of the inheritance pattern of this disease.

Is there a relationship between the size of an organism and its life span? Give two examples in support of your answer.

Name indicating their functions, a few additional enzymes, other than DNA polymerase and ligase, that are involved in the replication of DNA with high degree of processivity and accuracy.