CBSE Class 12 Biology Question Paper 2019 Set 10 Solved

CBSE Class 12 Biology Question Paper Solved 2019 Set J. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION A

1. State from where do the signals for parturition originate in human females.

2. Name the pattern of inheritance where F₁ phenotype

(a) resembles only one of the two parents.

(b) does not resemble either of the two parents and is in between the two.

3. According to the Hardy-Weinberg principle, the allele frequency of a population remains constant. How do you interpret the change of frequency of alleles in a population ?

OR

Coelacanth was caught in South Africa. State the significance of discovery of Coelacanth in the evolutionary history of vertebrates.

4. State the functions of mast cells in allergy response.

OR

State the function of interpherons.

5. What is the cell that receives a recombinant gene called ?

SECTION B

6. Name a disorder a human suffers from as a result of monosomy of the sex chromosome. Give the karyotype and write the symptoms.

7. In the T.S. of a mature anther given below, identify ‘‘a’’ and ‘‘b’’ and mention their functions.

OR

What is cleistogamy ? Write one advantage and one disadvantage of it, to the plant. 

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