CBSE Class 12 Biology Question Paper 2019 Set F

CBSE Class 12 Biology Question Paper 2019 Set F. 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. At what stage does the meiosis occur in an organism exhibiting haploidic life cycle and mention the fate of the products thus produced.

2. Write the number of chromosomes body cells of honey bee workers and drone have.

3. What are ‘flocs’, formed during secondary treatment of sewage ?

OR

Write any two places where methanogens can be found.

4. Name the layer of the atmosphere that is associated with ‘good ozone’.

OR

Mention the term used to describe a population interaction between an orchid growing on a forest tree.

5. British geneticist R.C. Punnett developed a graphical representation of a genetic cross called “Punnett Square”. Mention the possible result this representation predicts of the genetic cross carried.

SECTION – B

6. It is said apomixes is a type of asexual reproduction. Justify.

7. Mention four significant services that a healthy forest ecosystem provide.

OR

Substantiate with the help of one example that in an ecosystem mutualists (i) tend to co-evolve and (ii) are also one of the major causes of biodiversity loss.

8. Write the steps in sequence as carried in multiple ovulation embryo transfer technology.

9. What is an origin of replication in a chromosome ? State its function.

10. List any four ways by which GMO’s have been useful for enhanced crop output. 

11. How is a continuous culture system maintained in bioreactors and why ? 

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