CBSE 12 biology question paper NEET

Medical college entrance exams



1. Which of the following branches of biology applies both to plants as well as animals?

(a) Taxonomy (b) Mycology

(c) Virology (d) Entomology

2. Phenetic classification is based on

(a) ancestral lineage of existing organisms

(b) observable characteristics of existing organisms

(c) dendrograms based on DNA characteristics.

(d) sexual characteristics

3. In which of the following “binomial nomenclature” is described?

(a) Genera Plantarum

(b) Historia Plantarum

(c) Systema Naturae

(d) Flora Japonica

4. Virus attacking blue-green algae is known as

(a) cyanophage (b) coliphage

(c) bacteriophage (d) zoophage

5. Helical contractile sheath occurs in

(a) bacteria (b) bacteriophage

(c) riboviruses (d) fungi

6. Minute structure of the bacterial cell is

(a) hair (b) flagella

(c) cilia (d) pili

7. The bacteria which converts nitrites to nitrates is

(a) Nitrosococcus (b) Nitrosomonas

(c) Nitrobacter (d) Azotobacter

8. Algae attached to stones are called

(a) epiploic (b) monolithic

(c) epilithic (d) none of these

9. Which of the following are edible fungi?

(a) Lycoperdon (b) Rhizopus

(c) Morchella (d) Penicillium

10. In Agaricus, the largest phase of the nuclear condition is

(a) n (b) 2n

(c) n+n (d) 3n

11. Female sex organs of bryophytes are called

(a) oogonia (b) ascogonia

(c) archegonia (d) antheridia

12. Which one are probiotic bryophytes?

(a) Ricciocarpus (b) Porella

(c) Buxbaumia phyla (d) Sphagnum

13. Maximum transpiration occurs in

(a) mesophytic plants (b) hydrophytic plants

(c) xerophytic plants (d) algal

14. Prothallus (gametophyte) gives rise to fern plant (sporophyte) without fertilisation. It is

(a) apospory (b) apogamy

(c) parthenocarpy (d) parthenogenesis

15. Which one has the largest gametophyte?

(a) Cycas (b) Angiosperm

(c) Selaginella (d) Moss

16. Which element is necessary for middle lamella?

(a) Ca (b) Zn

(c) K (d) Cl

17. The chief function of vessels in the plant body is

(a) to translocate food material

(b) to conduct water and mineral salt

(c) to support living cells

(d) all of the above

18. In plant cells, peroxisomes are associated with

(a) photorespiration (b) phototropism

(c) photoperiodism (d) photosynthesis

19. In chloroplasts, chlorophyll is present in the

(a) outer membrane (b) inner membrane

(c) thylakoids (d) stroma

20. The technique to detect specific genes is called

(a) DNA cloning (b) Southern blotting

(c) Western blotting (d) Northern blotting

21. Which of the following is a polygamous plant?

(a) Mangifera (b) Rosa

(c) Gossypium (d) Pisum

22. Which contribute to the success of Mendel?

(a) Qualitative analysis of data

(b) Observation of distinct inherited traits

(c) His knowledge of biology

(d) Consideration of one character at one time

23. Mutations used in agriculture are commonly

(a) induced (b) spontaneous

(c) lethal (d) recessive and lethal

24. it mates with Tt. What will be characteristic of offspring?

(a) 75% recessive (b) 50% recessive

(c) 25% recessive (d) All dominant

25. Replug is present in the ovary of the flower of

(a) lemon (b) mustard

(c) sunflower (D) pea

Assertion and Reason Types Questions

Choose any one of the following four responses:

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
(c) If the assertion is true but the reason is false.
(d) If assertion and reason both are false.

26. Assertion: Transformation involves the donor and recipient bacteria.
Reason: Transformation is used for phenotypic alteration in cells.

27. A: A nucleotide is derived from a nucleoside by the addition of a molecule of phosphoric acid.

R: DNA is the genetic material.

28. A: Lichen has two partners- a fungus and an alga.
R: Lichen shows helotism.

29. A: Mutation is the ultimate source of all genetic variation.
R. Some level of mutation is essential to provide new genetic variability to allow organisms to adapt to new environments.

30. A: Carotenoids are soluble in organic solvents.
R: Carotenoids are accessory pigments.

(31- 35) Match the Following

31. Column I                                      Column II
(A) Peritrichous                               (i) Ginkgo flagellation
(B) Living fossil                               (ii) Macrocystis
(C) Rhizophora                                (iii) Escherichia coli
(D) Smallest flowering                   (iv) Selaginella plant
(E) Largest perennial                     (v) Wolffia alga


(36-40) Fill in the Blanks

36. Idioblasts are specialised…………………. cells.
37. In Clematis, the ………………… is modified into a tendril.
38. Golden rice is rich in ………………………
39. Actinomycin D inhibits the process of ……………
40. Grazing is an example of …………….pollution.

CBSE 12 biology question paper NEET

(41-45) True false type

41. In a polluted lake, the index of pollution is Daphnia.
42. In ferns, sporangia are borne on the adaxial surface of a sporophyll.
43. In Trp operon, tryptophan functions as a corepressor.
44. Gene for ATPase is known as housekeeping gene.
45. Caryopsis develops from an inferior ovary.

(46-50) Short Answer type

46. Define palynology.
47. Define gene pool.
48. Name the two types of operons?
49. Expand the term ODS.
50. Define DNA fingerprinting