12th NEET

Practice Test (Botany)

DATE: 15/04/2025
SECTION-A 5. Chasmogamous flowers;
(1) have exposed anthers and stigma.
1. Among the following identify the end products of
sexual reproduction in flowering plants. (2) do not open at all.
(1) Embryo (2) Zygote (3) produce assured seed-set even in the absence
(3) Flower (4) Seeds and fruits of pollinators.
(4) frequently show complete autogamy.
2. Identify the incorrect statement from the 6. Identify the correct statement w.r.t the parts of a
following w.r.t megasporogenesis in flowering typical stamen.
plants. (1) The long and slender stalk is called the anther.
(1) The process of formation of megaspores from
(2) The terminal generally bilobed structure is
the megaspore mother cell is called
called the filament.
megasporogenesis.
(3) The long and slender stalk is called the style.
(2) Ovules generally differentiate a single
megaspore mother cell (MMC) in the (4) The terminal generally bilobed structure is
micropylar region of the nucellus. called the anther.
(3) MMC is a large cell containing dense 7. In an embryo sac, the egg apparatus consists of;
cytoplasm and a prominent nucleus. (1) one synergid and one egg cell.
(4) The MMC undergoes mitotic division that (2) one synergid and two egg cells.
results in the production of four megaspores. (3) two synergids and two egg cells.
(4) two synergids and one egg cell.
3. Identify A, B, C and D from the given figure.
8. Often the theca in anther are separated by;
(1) longitudinal groove. (2) transverse groove.
(3) diagonal groove. (4) circular groove.
9. Functional megaspore in an angiosperm develops
into;
(1) ovule. (2) endosperm.
(3) embryo sac. (4) embryo.
10. Statement I: In a transverse section, a typical
microsporangium appears near circular in outline.
Statement II: The anther is a four-sided
(tetragonal) structure consisting of four
microsporangia located at the corners, two in each
lobe.
A B C D
(1) Statement I and Statement II both are correct.
(1) Filament Style Ovary Stigma
(2) Statement I is correct but Statement II is
(2) Style Filament Ovary Stigma
(3) Filament Stigma Ovary Style incorrect.
(4) Stigma Style Ovary Filament (3) Statement I is incorrect but Statement II is
correct.
4. Filiform apparatus plays an important role in; (4) Statement I and Statement II both are
(1) guiding the pollen tubes into the synergid. incorrect.
(2) producing nectar. 11. Identify the incorrectly matched pair w.r.t the
(3) stimulating division of generative cell. number of ovules in an ovary.
(4) development of embryo sac. (1) Paddy - One
(2) Wheat - Many
(3) Mango - One
(4) Orchids - Many
12. Assertion (A): Tapetum nourishes the developing 18. Match List-I with List-II to find out the correct
pollen grains. option w.r.t structure of pollen grain.
Reason (R): Tapetum is the innermost wall layer List-I List-II
of microsporangium. (I) The inner wall (A) Bigger cell
(1) Both Assertion (A) and Reason (R) are true (II) The outer wall (B) Smaller cell
and Reason (R) is a correct explanation of (III) The vegetative cell (C) Exine
Assertion (A). (IV) The generative cell (D) Intine
(2) Both Assertion (A) and Reason (R) are true I II III IV
but Reason (R) is not a correct explanation of (1) B D A C
Assertion (A). (2) D C A B
(3) Assertion (A) is true and Reason (R) is false. (3) A D B C
(4) Assertion (A) is false and Reason (R) is true. (4) C D B A

13. The three outer wall layers of microsporangium 19. Basal part of the ovule is represented by;
perform the function of; (1) micropyle.
(1) nourishment to pollen grains. (2) chalaza.
(2) protection and help in dehiscence of anther to (3) funicle.
release the pollen. (4) nucellus.
(3) attachment of filament to anther.
(4) storage of reserve food material. 20. Assertion (A): Pollen grains are well preserved as
fossils.
14. Genetically different type of pollen grains is Reason (R): The hard outer layer of pollen grain is
brought to stigma by; made up of sporopollenin.
(1) autogamy only. (1) Both Assertion (A) and Reason (R) are true
(2) geitonogamy only. and Reason (R) is a correct explanation of
(3) xenogamy only. Assertion (A).
(4) geitonogamy and xenogamy both. (2) Both Assertion (A) and Reason (R) are true
but Reason (R) is not a correct explanation of
15. In an embryo sac, three cells at the chalazal end are Assertion (A).
called the; (3) Assertion (A) is true and Reason (R) is false.
(1) egg apparatus. (4) Assertion (A) is false and Reason (R) is true.
(2) antipodals.
(3) synergids. 21. The pollen grain represents the;
(4) egg cells. (1) female gametophyte.
(2) male gametophyte.
16. The cells of the sporogenous tissue in an anther (3) megasporangium.
undergo meiotic divisions to form; (4) microsporangium.
(1) microspore tetrads.
(2) pollen sac. 22. Among the following identify the plant which is
(3) megaspore tetrad. not water-pollinated.
(4) embryo sac. (1) Vallisneria
(2) Hydrilla
17. Statement I: Pollen grains are rich in nutrients. (3) Zostera
Statement II: Pollen grains are generally spherical (4) Water hyacinth
measuring about 50-75 micrometers in diameter.
(1) Statement I and Statement II both are correct. 23. Inside the embryo sac of a flowering plant out of
(2) Statement I is correct but Statement II is eight nuclei, how many nuclei are present in the
incorrect. central cell?
(3) Statement I is incorrect but Statement II is (1) Six
correct. (2) Four
(4) Statement I and Statement II both are (3) Five
incorrect. (4) Two
24. Statement I: The period for which pollen grains 29. The placenta of a flower is located inside the;
remain viable is highly variable and to some extent (1) megaspore. (2) pollen sac.
depends on the prevailing temperature and humidity. (3) ovule. (4) ovarian cavity.
Statement II: In some cereals such as rice and
wheat, pollen grains lose viability within 15 30. Ovule is also known as;
minutes of their release. (1) megasporangium.
(1) Statement I and Statement II both are correct. (2) microsporangium.
(2) Statement I is correct but Statement II is (3) female gametophyte.
incorrect. (4) male gametophyte.
(3) Statement I is incorrect but Statement II is
correct. 31. The ovule is a small structure attached to the
(4) Statement I and Statement II both are placenta by means of a stalk called;
incorrect. (1) hilum. (2) funicle.
(3) integuments. (4) nucellus.
25. Identify the incorrect statement from the
following. 32. Identify the correct number of types of pollination,
(1) The inner wall of the pollen grain is a thin and depending on the source of pollen.
continuous layer made up of cellulose and (1) Two (2) Three
pectin. (3) Four (4) Six
(2) In over 60 per cent of angiosperms, pollen
grains are shed at 2-celled stage. 33. The body of the ovule fuses with funicle in the
(3) In about 40 per cent species of angiosperms, region called;
the vegetative cell divides mitotically to give (1) micropyle. (2) hilum.
rise to the two male gametes before pollen (3) chalaza. (4) embryo sac.
grains are shed (3-celled stage).
(4) Pollen grains of many species cause severe 34. Inside the ovary is the ovarian cavity which is also
allergies and bronchial afflictions in some known as;
people. (1) placenta. (2) locule.
(3) carpel. (4) thalamus.
26. Match List-I with List-II to find out the correct
option w.r.t parts of a pistil. 35. All the given plants produce both chasmogamous
List-I List-II and cleistogamous flowers, except;
(I) Stigma (A) Elongated slender part (1) Viola. (2) Hibiscus.
beneath the stigma (3) Oxalis. (4) Commelina.
(II) Style (B) The basal bulged part of
the pistil SECTION-B
(III) Ovary (C) Serves as a landing
platform for pollen grains 36. Statement I: Each ovule has one or two protective
I II III envelopes called integuments in angiosperms.
(1) A B C Statement II: Integuments encircle the nucellus
(2) B C A except at the tip where a small opening called the
(3) A C B micropyle is organised.
(4) C A B (1) Statement I and Statement II both are correct.
(2) Statement I is correct but Statement II is
27. In some members of Rosaceae, Leguminoseae and incorrect.
Solanaceae, pollen grains maintain viability for; (3) Statement I is incorrect but Statement II is
(1) 30 minutes. (2) a day. correct.
(3) a week. (4) months. (4) Statement I and Statement II both are
incorrect.
28. Gynoecium have more than one pistil and the
pistils may be fused together; such condition of 37. An ovule generally has _____ embryo sac(s)
gynoecium is called as; formed from a _____.
(1) monocarpellary, syncarpous. (1) a single, microspore
(2) multicarpellary, apocarpous. (2) two, megaspore
(3) monocarpellary, apocarpous. (3) a single, megaspore
(4) multicarpellary, syncarpous. (4) two, microspore
38. When the anther is young, a group of compactly A B C
arranged homogenous cells occupies the centre of (1) F T F
each microsporangium and are called the; (2) T T F
(1) sporogenous tissue. (3) T F F
(2) connective. (4) T F T
(3) endothecium.
(4) middle layers. 44. All of the following are true w.r.t the generative
cell of pollen grain except;
(1) floats in the cytoplasm of the vegetative cell.
39. Identify the incorrect statement from the (2) is spindle shaped.
following. (3) has a dense cytoplasm and a nucleus.
(1) Flowers are morphological and embryological (4) has abundant food reserve.
marvels and the sites of sexual reproduction.
(2) Flowers are objects of aesthetic, ornamental, 45. Assertion (A): Cleistogamous flowers are
social, religious and cultural value. invariably autogamous.
(3) All flowering plants do not show sexual Reason (R): In cleistogamous flowers there is no
reproduction. chance of cross-pollen landing on the stigma.
(4) Flowers do not exist only for us to be used for (1) Both Assertion (A) and Reason (R) are true
our own selfishness. and Reason (R) is a correct explanation of
Assertion (A).
40 . Match List-I with List-II to find out the correct (2) Both Assertion (A) and Reason (R) are true
but Reason (R) is not a correct explanation of
option. Assertion (A).
List-I List-II (3) Assertion (A) is true and Reason (R) is false.
(I) General character (A) Corn cob (4) Assertion (A) is false and Reason (R) is true.
of insect
pollinated plants 46. Cells of microsporangium that possess dense
(II) The tassels wave (B) Flowers are large, cytoplasm and generally have more than one
in the wind to trap colourful, fragrant nucleus belong to;
pollen grains and rich in nectar (1) epidermis. (2) endothecium.
(III) Commonly wind (C) Limited to only 30 (3) middle layers. (4) tapetum.
pollinated plants genera of flowering
plants 47. In the flower the male and female reproductive
structures are respectively;
(IV) Pollination by (D) Grasses (1) androecium and the gynoecium.
water (2) gynoecium and the androecium.
I II III IV (3) pistil and the whorl of stamens.
(1) B D A C (4) filament and pollen sacs.
(2) D C A B
(3) B A D C 48. A typical angiosperm anther is _____ with each
(4) C D B A lobe having _____ theca.
(1) bilobed, four (2) bilobed, one
41. A typical angiosperm embryo sac, at maturity is; (3) bilobed, two (4) bilobed, three
(1) 8-nucleated and 7-celled.
(2) 8-nucleated and 8-celled. 49. Identify the incorrect statement w.r.t
(3) 7-nucleated and 7-celled. geitonogamy.
(1) It is transfer of pollen grains from the anther
(4) 7-nucleated and 8-celled.
to the stigma of another flower of the same
plant.
42. The microsporangia develop further and become; (2) It is functionally cross-pollination.
(1) anther. (2) pollen sacs. (3) Genetically it is similar to xenogamy.
(3) synergids. (4) embryo sac. (4) Involves a pollinating agent.

43. Read the following statements and identify them as 50. Identify the incorrect statement w.r.t
true (T) of false (F). sporopollenin.
A. Often flowers of animal-pollinated plants are (1) It is one of the most resistant organic
specifically adapted for a particular species of materials known.
animal. (2) It can withstand high temperatures and strong
B. Majority of plants use abiotic agents for acids and alkali.
pollination. (3) No enzyme that degrades sporopollenin is so
C. Only a small proportion of plants use biotic far known.
(4) Sporopollenin is present at germ pores of
agents.
pollen grain’s exine.