CBSE Class 12th Biology Solved Question Papers 2011-Set 1

The pattern in which the question papers are being set for a particular subject is quite different from the manner in which the course structure is defined actually. Though the course curriculum is predefined, there are certainly some gaps between the question paper formed and the content of the course. Henceforth, students need to identify these gaps and catch up where the textbooks left off, if they want to get acquainted with the examination pattern. And, they can do it easily by checking out previous year question papers and their solutions. This not only helps them prepare for exams in a better manner but also leads them to the depth which the topic should be studied with.

Some solved questions of this paper are given below

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

Ans.

Fusion of egg and fertilization outside the body leads to the formation of embryo, which undergoes successive division leading to the formation of blastomere. When embryos division exceed 8 cell stage then they are transferred to uterine wall of a human female

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Q.State the importance of biofortification.

Ans.

Use of improved genetic technology to increase the amount of vitamin, minerals, protein, fat, Micronutrient and mineral content of plant is termed as biofortification.  

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Q.Biotechnologists refer to Agrobacterium tumifaciens as a natural genetic engineer of plants. Give reasons to support the statement.

Ans.

Insetition of vector (Agrobacterium tumifaciens) containing gene nematode specific gene into the host plant, whose DNA have the ability to produce both sens and antisens DNA in the host. The tow complementary sequence then form dsRNA which initiate synthesis of RNAi. These RNAi then blocks mRNA synthesis and leads to the death of pathogen.  

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Q. How do algal blooms affect the life in water bodies ?

Ans.

Large amount of nutrient content in water cause excessive production of planktonic algae called algal bloom, which impart colour to the water bodies. Algal blooms deminsh water quality, fish mortality extremely toxic to human beings and animals.

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Q. Name the common ancestor of the great apes and man.

Ans.

Australopithecines was first recorded form grassland, while Ramapithecus and Dryopithecus differ on walking style.

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