CBSE Class 12 Biology Question Paper 2019 Set 03 Solved

CBSE Class 12 Biology Question Paper Solved 2019 Set C. 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. Give one reason to justify statutory ban on amniocentesis.

2. 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.

3. Mention one example each from plants and animals exhibiting divergent evolution.

4. 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

5. Give two reasons as to why a weed such a Calotropis flourishes in abandoned fields.

SECTION B

6. Mosses and frogs both need water as a medium for fertilisation. Where does syngamy occur and how is it ensured in both these organisms ?

OR

Write the basis of categorising animals as oviparous or viviparous, giving one example of each.

7. (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.

8. 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 ?

9. How is ‘somatic hybridization’ carried out ? Mention one example of a somatic hybrid.

10. How are DNA fragments visualised during gel-electrophoresis ? What is elution ? 

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