CBSE Class 12 Biology Question Paper 2019 Set 05

CBSE Class 12 Biology Question Paper 2019 Set E. 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. Mention one example each from plants and animals exhibiting divergent evolution.

2. Give one reason to justify statutory ban on amniocentesis.

3. Name any two physiological barriers that provide innate immunity.

OR

Select two disease resistant crop varieties from the list of crop varieties given below :

Himgiri, Pusa Gaurav, Pusa Komal, Pusa A-4

4. Name a human genetic disorder due to the following :

(a) An additional X-chromosome in a male

(b) Deletion of one X-chromosome in a female

OR

State what does aneuploidy lead to.

5. Why is the rate of secondary succession much faster than that of primary succession ?

SECTION B

6. State ‘two’ observations made by German naturalist, Alexender von Humboldt during his extensive explorations in South American jungles.

7. A segment of DNA molecule comprises of 546 nucleotides. How many cytosine nucleotides would be present in it if the number of adenine nucleotides is 96 ?

8. (a) You are given castor and bean seeds. Which one of the two would you select to observe the endosperm ?

(b) The development of endosperm precedes that of embryo in plants. Justify.

9. Name a distinguishing structure seen in a mature black pepper seed and not in a pea seed. State how does it develop. 

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