Subject

Biology

Class

CBSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
Advertisement

 Multiple Choice QuestionsShort Answer Type

11.

(a) Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi ? Provide explanations to your answer.

2130 Views

12.

Both Haemophilia and Thalassemia are blood related disorders in humans. Write their causes and the difference between the two. Name the category of genetic disorder they both come under.

1123 Views

13.

(a) List the two methodologies which were involved in human genome project. Mention how they were used.
(b) Expand ‘YAC’ and mention what was it used for.

1515 Views

14.

Write the characteristics of Ramapithecus, Dryopithecus and Neanderthal man.

1421 Views

Advertisement
15.

Name a human disease, its causal organism, symptoms (any three) and vector, spread by intake of water and food contaminated by human faecal matter.

692 Views

Advertisement

16.

(a) Write the desirable characters a farmer looks for in his sugarcane crop. (b) How did plant breeding techniques help north Indian farmers to develop cane with desired characters ?


(a) The desirable characters that should be present in sugarcane crop are : - (a) High yield (b) Thick stem (c) High sugar content (d) ability to grow in North India.
(b) With the help of plant breeding, the two varieties of sugarcane i.e. Saccharum barberi [sugarcane of North India] and Saccharum officinarum [sugarcane of South India] were crossed to obtain sugarcane varieties having desirable qualities. So that a good quality sugarcane variety could be grown in North India.

849 Views

Advertisement
17.

Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process

717 Views

18.

(a) Explain the significance of palindromic nucleotide sequence in the formation of recombinant DNA.
(b) Write the use of restriction endonuclease in the above process.

1317 Views

Advertisement
19.

Describe the roles of heat, primers and the bacterium Thermus aquaticus in the process of PCR.

875 Views

20.

Explain the various steps involved in the production of artificial insulin.

903 Views

Advertisement