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Test: Post-Fertilization (Structures & Events) - NEET MCQ


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15 Questions MCQ Test Biology Class 12 - Test: Post-Fertilization (Structures & Events)

Test: Post-Fertilization (Structures & Events) for NEET 2024 is part of Biology Class 12 preparation. The Test: Post-Fertilization (Structures & Events) questions and answers have been prepared according to the NEET exam syllabus.The Test: Post-Fertilization (Structures & Events) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Post-Fertilization (Structures & Events) below.
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Test: Post-Fertilization (Structures & Events) - Question 1

The true embryo develops as a result of fusion of 

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 1

Double fertilization is the fusion of two male gametes brought by a pollen tube to two different cells of the same female gametophyte in order to produce two different structures. It is found only in angiosperms where it was first discovered by Nawaschin in 1898 in Fritillaria and Lilium. Out of the two male gametes one fuses with egg or cosphere to perform generative fertilization. Generative fertilization is also called syngamy or true fertilization. It give rise to a diploid zygote or cospore. the second male gamete fuses with the two haploid polar nuclei or diploid secondary nucleus of the central cell to form a triploid primary endosperm nucleus (PEN). This second fertilisation is called vegetative fertilisation.

Test: Post-Fertilization (Structures & Events) - Question 2

Milk of tender coconut represents (i) and the surrounding white coconut meal represents (ii).

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 2

In coconut (Cocos nucifera), the surrounding white kernel called coconut meal is cellular endosperm and the coconut water (also called coconut milk) in the centre is free nuclear endosperm made up of thousands of nuclei.

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Test: Post-Fertilization (Structures & Events) - Question 3

Endosperm is completely consumed by the developing embryo in

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 3

Endosperm represents the food storing tissue of a seed. It is produced as a result of double fertilisation in angiosperms. In most monocots and some dicot seeds, the food reserve remains in the endosperm. They are called endospermic or albuminous seeds, e.g., maize, wheat, castor bean, coconut, barley, rubber. However, in the majority of dicot seeds(e.g., orchids, Sagittaria), the endosperm is consumed during seed development and the food is stored in cotyledons and other regions. They are called non endospermic or exalbuminous seeds.

Test: Post-Fertilization (Structures & Events) - Question 4

Coleorhiza and coleoptile are the protective sheaths coverging_______and__________respectively.

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 4
  • The epicotyl bearing shoot apex and leaf primordia are enclosed in a foliar structure called coleoptile. It protects the plumule during emergence from the soil.
  • The radicle is protected in a sheath called coleorhiza. It protects the radicle during its passage into the soil.
  • So, the correct answer is " radicle, plumule ".
Test: Post-Fertilization (Structures & Events) - Question 5

Endosperm development precedes ____ development.

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 5
  • Following double fertilization, post fertilization events begin.
  • Events like endosperm formation and embryo development, formation of seeds from ovules and ovary into fruit are classified as post fertilization events.
Test: Post-Fertilization (Structures & Events) - Question 6

Identify the parts labelled A, B and C in the given figure and select the correct option.

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 6

Given figure represents the monocotyledonous embryo of a grass.

Test: Post-Fertilization (Structures & Events) - Question 7

Identify the parts labelled as A, B, C and D in the given figure and select the correct option from the codes given below

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 7

To identify the parts labeled as A, B, C, and D in the given figure, let's analyze the provided options:

1. A: Seed coat (outer covering)
2. B: Scutellum (a part of the embryo in grass seeds)
3. C: Hypocotyl (the part of the embryo below the cotyledons)
4. D: Epicotyl (the part of the embryo above the cotyledons)

From the table provided, the correct option is:

Option d: ie (b)

- A: Seed coat
- B: Scutellum
- C: Hypocotyl
- D: Epicotyl

Test: Post-Fertilization (Structures & Events) - Question 8

Persistent nucellus is called as______________and is found in __________.

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 8

In some seeds, remains of nucellus persist. This residual nucellus which persists in the seed is called perisperm, e.g., black pepper, coffee, castor, cardamum, Nymphaea.

Test: Post-Fertilization (Structures & Events) - Question 9

If an endosperm cell of an angiosperm contains 24 chromosomes, the number of chromosomes in each cell of the root will be

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 9

In angiosperms. Endosperm is a triploid (3n) structure
∴ 3n = 24, then n = 8
Root represents is the diploid structure of a plant, therefore 2n = 16

Test: Post-Fertilization (Structures & Events) - Question 10

The cells of endosperm have 24 chromosomes. What will be the number of chromosomes in the gametes? 

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 10

In angiosperms, endosperm is a triploid structure.
∴ 3n = 24 (given), then n = 8
As gametes are haploid structures, therefore number of chromosomes in gametes is 8

Test: Post-Fertilization (Structures & Events) - Question 11

In the given diagram, X represents

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 11

Nuclear endosperm (X) is the most common type of endosperm. It is named so because it contains free nuclei in the beginning. The primary endosperm nucleus divides of free nuclei. Meanwhile central vacuole appears in the central cell and pushes the cytoplasm containing the nuclei to the periphery. The cytoplasm thickens so that the vacuole decreases in size. It ultimately disappears with the exception of a few cases. The multinucleate cytoplasm undergoes cleavage and gives rise to a multicellular tissue, e.g., maize, wheat, rice, sunflower, Capsella bursa-pastoris.

Test: Post-Fertilization (Structures & Events) - Question 12

During which stage of the cell cycle does microsporogenesis occur in plants?

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 12

Microsporogenesis, the process of forming microspores from a pollen mother cell (PMC), begins during Prophase I of meiosis. This is when the PMC undergoes meiotic division to eventually produce four haploid microspores.

Test: Post-Fertilization (Structures & Events) - Question 13

The function of micropyle in the mature seed is

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 13

Micropyle plays a significant role in the germination of the seed. A narrow opening in the integuments at the terminal end of the nucleus is called a micropyle. In the first place, the pollen tube reaches the ovule to deposit the sperm for fertilization from the micropylar end. Second, at the time of germination of the seed, the micropyle helps the absorption of water and finally, the roots emerge through the micropyle during germination of the seeds. It is through the micropylar end that the pollen tube enters the ovule depositing the sperm, which will result in fertilization. The micropyle helps to absorb water at the time of germination of the seed. It is through this micropyle that the root emerges at the time of germination of the seed.

The opening of the micropyle allows the pollen to enter the ovule for fertilization. In gymnosperms (e.g., conifers), pollen is drawn into the ovule by a drop of fluid that flows out of the micropyle. Subsequently, the micropyle closes. Only a pollen tube enters the micropyle in angiosperms. The radicle of the seedling emerges through the micropyle during germination.

Test: Post-Fertilization (Structures & Events) - Question 14

Study the following statements and select the correct option.
(i) Tapetum nourishes the developing pollen grains.
(ii) Hilum represents the junction between ovule and funicle.
(iii) In aquatic plants such as water hyacinth and water lily, pollination is by insects.
(iv) The primary endosperm nucleus is triploid.

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 14

The correct option is   (i), (ii), (iv) correct; (iii) incorrect

Tapetum

Tapetum is the innermost layer of anther which protects and provides nourishment to the developing pollen.
Hence, the statement in option ‘a’ is correct.

Hilum

Hilum is the scar that represents the site where the funicle fuses with the body of the ovule.
Hence, the statement in option ‘b’ is correct.

Pollination of aquatic plants

Aquatic plants such as water hyacinth and water lily have flowers that emerge out of the water surface and are hence pollinated by wind or insects.
Hence, the statement in option ‘c’ is incorrect.

Primary endosperm nucleus

The primary endosperm nucleus is formed as a result of the fusion between one of the haploid (n) male gametes with the diploid (2n) secondary nucleus of the central cell and is hence triploid (3n) in nature.
Hence, the statement in option ‘d’ is correct.

Final answer
(i), (ii), (iv) correct; (iii) incorrect

Test: Post-Fertilization (Structures & Events) - Question 15

Identify the wrong statement regarding post fertilization development.

Detailed Solution for Test: Post-Fertilization (Structures & Events) - Question 15

After fertilisation, the integuments of the ovule form the protective coats (seed coats). Outer integument develops into testa and the inner one develops into tegmen.

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