NCERT CLASS 12 | TOPIC : SEXUAL REPRODUCTION IN FLOWERING PLANTS | QB-3 | NEET BIOLOGY ONLINE TEST

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NCERT CLASS 12 | TOPIC : SEXUAL REPRODUCTION IN FLOWERING PLANTS | QB-3 | NEET BIOLOGY ONLINE TEST

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It contains 41 important questions. Choose the most correct answer. Then check your answer. Try again if there are errors. Regards : www.onlinetest.kalvisolai.com

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1 ➤ 201. Endosperm is a product of ________ and embryo is a product of ________.

(a) Triple fusion, syngamy (b) Syngamy, triple fusion (c) Syngamy, Syngamy (d) Triple fusion, Triple fusion

2 ➤ 202. Post-fertilization events do not include (A) Formation of primary endosperm cell (B) Maturation of ovules in seed (C) Formation of ovary into fruit (D) Formation of embryo inside seed

(a) Only A (b) Only B (c) Only C (d) None of these

3 ➤ 203. Which of the following precedes the other?

(a) Development of embryo before endosperm (b) Endosperm developing before embryo (c) Both the development of embryo and endosperm occurs simultaneously (d) All the above

4 ➤ 204. Which one of the following is correct for endosperm?

(a) The cells of this tissue are filled with reserve food material. (b) Used for nutrition of developing embryo. (c) PEN undergoes nuclear division followed by cytokinesis. (d) All the above

5 ➤ 205. Endosperm is earlier ________ and then develops into ________

(a) cellular, nuclear (b) nuclear, cellular (c) cellular, cellular (d) nuclear, nuclear

6 ➤ 206. The number of nuclei in free nuclear endosperm before cellularization is

(a) Fixed (b) Varies greatly (c) Fixed in species (d) None of these

7 ➤ 207. Coconut water is ________ part of endosperm

(a) Cellular (b) Free nuclear (c) Cellular as well as nuclear (d) Neither cellular nor free nuclear

8 ➤ 208. White kernel of coconut is which part of endosperm?

(a) Cellular (b) Free nuclear (c) Cellular as well as nuclear (d) Neither cellular nor free nuclear

9 ➤ 209. Endosperm is completely consumed during seed formation in

(a) Pea, castor and coconut (b) Castor and coconut (c) Pea and beans (d) Groundnut and castor

10 ➤ 210. Endosperm persist in mature seed of

(a) Pea, castor and coconut (b) Castor and coconut (c) Pea and beans (d) Groundnut and castor

11 ➤ 211. Development of embryo takes place at

(a) Chalazal end of embryo sac (b) Micropyle end of embryo sac (c) Near the integument of embryo sac (d) All of these

12 ➤ 212. Zygote divides after the formation of endosperm

(a) To provide assured nutrition to develop the endosperm. (b) To provide assured nutrition to develop embryo. (c) None of these (d) Both (a) and (b)

13 ➤ 213. The development of embryo in both monocotyledons and dicotyledons

(a) Same (b) Differ greatly (c) Biennials in early staples of development (d) Both (b) and (c)

14 ➤ 214. Which of the following is correct?

(a) Proembryo → Mature embryo → Globular embryo (b) Proembryo → Globular embryo → Mature embryo (c) Globular embryo → Proembryo → Mature embryo (d) Mature embryo → Globular embryo → Proembryo

15 ➤ 215. The portion of embryo above the cotyledon is called ________ and below the cotyledon is called as ________

(a) Epicotyl, hypocotyl (b) Hypocotyl, epicotyl (c) Plumule, radical (d) Radical and plumule

16 ➤ 216. Epicotyl terminates into

(a) Stem tip (b) Root tip (c) Plumule (d) Both (a) and (c)

17 ➤ 217. Hypocotyl terminates into

(a) Root tip (b) Stem tip (c) Plumule (d) Both (a) and (c)

18 ➤ 218. Embryo of monocotyledon possess only

(a) Two cotyledon (b) One cotyledon (c) Scutellum (d) Both (b) and (c)

19 ➤ 219. The root cap of monocot is covered in

(a) Coleoptile (b) Coleorhiza (c) Root tip (d) None of these

20 ➤ 220. The leaf primordia is enclosed in hollow foliar structure called as

(a) Coleoptile (b) Coleorhiza (c) Root tip (d) None of these

21 ➤ 221. Identify A and B in this figure.

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(a) A: Thalamus, B: Endocarp (b) A: Thalamus, B: Achene (c) A: Endocarp, B: Mesocarp (d) A: Mesocarp, B: Endocarp

22 ➤ 222. Assertion: Pollen grains are well preserved as fossils.Reason: Pollen posses sporopollenin.

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

23 ➤ 223. Assertion: Pollen tables is used as a food supplement.Reason: Pollen grains are rich in nutrient.

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

24 ➤ 224. Assertion: Pollen tube enters the ovule through micropyle.Reason: Pollen tube enters in one of the synergids through filiform apparatus.

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

25 ➤ 225. Assertion: Coconut water is a cellular endosperm.Reason: White kernel of coconut is a free nuclear endosperm.

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

26 ➤ 226. Assertion: Most of the zygote divides only after certain amount of endosperm is formed.Reason: This is an adaptation to provide assumed nutrition to the developing embryo.

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

27 ➤ 227. Assertion: Embryos of monocotyledons posses only one cotyledon.Reason: In the grass family the cotyledon is called scutellum.

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

28 ➤ 228. Assertion: Parthenocarpic fruits are seedless Reason: Parthenocarpic fruits develop without fertilization.

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

29 ➤ 229. Assertion: Angiosperm can colonize is other areas easily. Reason: Angiosperms have seeds and seeds have better adoptive strategies for dispersal to new habitats.

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

30 ➤ 230. Assertion: Seed is the basic tool for agriculture. Reason: Dehydration and dormancy of mature seed is not crucial for the storage of seeds.

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

31 ➤ 231. Assertion: Polyembryony is found in all angiosperm. Reason: All angiosperm are produced by apomixis.

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

32 ➤ 232. Assertion: Exine of pollen grain is discontinuous layer. Reason: Exine absent at germ pores.

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

33 ➤ 233. Assertion: Pollen grains of some species can cause asthma. Reason: Pollen grains of some species are act as allergens.

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

34 ➤ 234. Assertion: Pollen bank can be formed for crop breeding programmes. Reason: Pollen grain of many species can be stored for year in liquid nitrogen (–196°C)

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

35 ➤ 235. Assertion: Wind pollinated plant have large feathery stigma. Reason: Feathery stigma easily traps air-borne pollen grains.

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

36 ➤ 236. Assertion: Water pollinated species have mucilaginous covering on pollen grains. Reason: Mucilage covering protect pollen grain from wetting.

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

37 ➤ 237. Assertion: Majority of flowering plant have bisexual flower still they show cross pollination. Reason: Continued self-pollination results in inbreeding depression.

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

38 ➤ 238. Assertion: Self incompatibility is genetic mechanism to prevent self pollination. Reason: It promotes germination of pollen from same plant or same flower on stigma.

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

39 ➤ 239. Assertion: Artificial hybridisation requires emasculation in bisexual flower. Reason: Emasculation is removal another before their dehiscence so it prevent self pollination.

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

40 ➤ 240. Assertion: The ploidy of primary endosperm nucleus (PEN) in angiosperm is 3n. Reason: PEN is formed by triple fusion.

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

41 ➤ 241. Assertion: Endosperm development occurs before embryo development.Reason: Cells of endosperm are filled with reserve food material and act as source of nutrition for developing embryo.

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

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