CBSE Class 12 Biology Solved Question Paper 2017

An electrostatic precipitator in a thermal power plant is not able to generate high voltage of several thousands. Write the ecological implication because of it.

Name the type of cross that would help to find the genotype of a pea plant bearing violet flowers.

List four benefits to human life by eliminating the use of CFCs .

State two postulates of Oparin and Haldane with reference to origin of life.

What are Cry genes ? In which organism are they present ?

Mention one application for each of the following : (a) Passive immunization (b) Antihistamine (c) Colostrum (d) Cytokinin-barrier

A pollen grain in angiosperm at the time of dehiscence from an anther could be 2-celled or 3-celled. Explain. How are the cells placed within the pollen grain when shed at a 2-celled stage ?

A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome this problem.

Name the microbes that help production of the following products commercially : (a) Statin (b) Citric acid (c) Penicillin (d) Butyric acid

Differentiate between the genetic codes given below : (a) Unambiguous and Universal (b) Degenerate and Initiator