Biology practice paper class 12th all boards

 Practice Paper-1

Class-XII 

Biology 

 

[Section-A:]

1. In which of the following polyembryony is found?

a) guava

b) orange

c) gram

d) maize

2. Discontinously synthesised fragments are joined by enzyme___

3. SCID patient lacks the enzyme___

4. What is the scientific name of fruit fly___

5. Which of the following is heterozygous:

a) TT

b) Tt

c) tt

d) None of these

6. ___is the surgical cutting of fallopian tube.

7. Biological pest control is:

a) Polluting

b) Toxic

c) Self perpetuating

d) Expensive

8. Which is stop codon:

a) UCA

b) UAG

c) UCG

d) UUG

9. Name the pathogen responsible for typhoid?

10. What is the site of protein synthesis?

11. The spermatids are transformed into sperms by the process called?

a) spermiogenesis

b) spermatogenesis

c) spermiation

d) oogenesis

12. Which antibodies are abundant in colostrum:

a) IgA

b) IgM

c) IgE

d) IgG

13. Megasporangium is also called___

14. Bt toxin is produced by bacterium___

15. What is humus?

Assertion - Reason Questions:

Options:

a) Both A and R true but R is correct explanation of A

b) Both A and R true but are is not correct explanation of A.

c) A is true but R is false

d) A is false but R is true

16. Assertion: Genetic code is degenerate.

Reason: Some amino acids are coded by more than one codon.

17. Assertion: Middle piece of sperm is called powerhouse

Reason: it contain mitochondria that provides energy for swimming.

18. Assertion: Adenine cannot pair with cytosine.

Reason: Because there would be two hydrogen atoms at one of the bonding position and none at other.

[Section B:]

19. Write the difference between sexual and asexual reproduction?

20. Write about barrier method of contraception.

21. Name the first transgenic cow? What is the advantage of its milk over than natural cow milk.

22. What are the basic steps in genetically modified organismis?

23. What is the process of RNA interference?

24. What is colostrum and what are its function?

[Section - C:]

25. Describe the structure of mature embryo sac showing PEN?

26. Draw diagram of anatropous ovule?

27. What is gene therapy? Explain by giving ADA example.

28. Explain double fertilisation?

OR

a) Explain VNTR and describe its role in DNA fingerprinting.

b) list any two applications of DNA fingerprinting.

29. Write the name of pathogen and mode of transmission of following:

a) malaria

b) amoebiasis

c) pneumonia

30. Write salient features of double helical structure of DNA.

[Section - D]

31. Case Study:

Ramesh always liked to visit a forest near his ancestral village. In addition to a variety of plants, it was inhabited by many birds and animals. He observed that each animal was living in a particular sets of conditions. He enquired from his teacher the reasons for this specificity.

1) What is habitat.

2) Write ecological importance of variation in habitats.

3) What did Ramesh observe in the forest?

32. Case Study:

Study the given figure and answer the following questions:

1) Name the process shown in figure and also label its part 1, 2, 3 and 4.

2) What is zygote?

[Section-E]

33. What is menstrual cycle? Write about the hormones involved in it?

OR

a) Describe test tube baby program

b) Describe various IUD's (intra-uterine devices)

34. Describe Miller and Urey experiment on origin of life.

OR

Explain the important inter specific interactions.

35. Write the process of transcription in eukaryotes?