CBSE Class 12 Biology Question Paper 2019 Set L

CBSE Class 12 Biology Question Paper 2019 Set L. 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. 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.

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

OR

State the function of interpherons.

3. 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.

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

 5. Write the two specific ‘cry’ genes that encode the proteins which control cotton bollworms.

SECTION B

6. Write the genotypes of the parents of a child suffering from thalassemia. State the cause of this disease.

7. Justify the need for signing of ‘Montreal Protocol’ by the participating nations in 1987.

OR

Write the effective remedy found by Ahmed Khan of Bengaluru for the efficient use of the plastic waste generated by big cities.

8. List any four common approaches for treatment of cancer.

9. Write the relationship between productivity, gross primary productivity, net primary productivity and secondary productivity. 

Please click the link below to download pdf file of CBSE Class 12 Biology Question Paper 2019 Set L.