2nd PUC Biology Answer Key 2025 Karnataka (OUT): Unofficial key PDF download

Question Number

Correct Answers

1. "Pollen grains are well preserved as fossils because of the presence of sporopollenin" as
Statement I: Sporopollenin is the most resistant organic material known,
Statement II: No enzyme that degrades sporopollenin is so far known.

Both Statement I and Statement II are correct.

2. The process of transformation of spermatids into sperms is called-

Spermiogenesis

3. Which one among the following is essential for the maintenance of endometrium and for the implantation of fertilized ovum?

Progesterone

4. Select the one among the given that is a probable reason for explosive growth of population in India.

Increase in the number of people in reproducible age

5. Which one among the following is a contraceptive method that involves no medicine or device?

Coitus interruptus

6. Which one among the following ART can be used to rectify if the infertility is due to low sperm count?

IUI

7. Which one among the given is a symbol used in human pedigree analysis for consanguineous mating?

8. Which one among these represents the flow of genetic information?

DNA → mRNA → Protein

9. If the change in gene frequency occurs by chance, it is called-

Genetic Drift

10. Which is the test that can be suggested among the given for a patient with symptoms such as sustained high fever (39°C-40°C), weakness, stomach pain, constipation, headache and loss of appetite?

Widal Test

11. Which among the following is an enzyme-modified by genetic engineering and used as a "Clot buster"?

Streptokinase

12. In which method the plant cells are bombarded with high-velocity microparticles of gold coated with DNA?

Biolistics

13. The use of bioresources by multinational companies and other organisations without proper authorisation and compensatory payment is called as

Biopiracy

14. In which of the processes given, the humus is degraded by some microbes and release of inorganic nutrients occurs?

Mineralisation

15. Which one among these is an example of Ex-situ conservation?

Sanctuaries

Question Number

Correct Answers

16. Few flowering plants have evolved a special mechanism to produce seeds without fertilization called ______.

Apomixis

17. Single-step large mutation is known as _______.

Saltation

18. _______ acts on uterine muscle and causes stronger contractions during parturition.

Oxytocin

19. Members of genus _______ form mycorrhiza and absorb phosphorous from soil and supply it to the plant.

Trichophyton

20. The step in which bands of DNA are cut out and extracted from a gel piece is termed as ________.

Elution

2nd PUC Karnataka Biology Exam Analysis 2025