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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

12th Standard English Medium Biology (Botany) Subject Asexual and Sexual Reproduction in Plants Creative 3 Mark Questions with Solution Part - I

Published on: 21/06/2021

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Std: 12th Standard - Biology

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

If you break open the coconut fruit, we can observe a fluid part and the white kernel. What does those parts represent?

Observe the picture and answer the questions.
(a) Label the part - A
(b) Name the types of vegetative propagule
(c) Give one example for such type of vegetative propagule

What do you know about bee pollen?

What are the functions of tapetum

Where the stomium is located? What is its role?

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Answers Key:

Generic 3

5 x 3 = 15

The fluid part of the coconut represents free-nuclear endosperm and the white kernel represents cellular endosperm.

(a) A - Bud from eye
(b) Tuber
(c) Solanum tuberosum

(i) Bee pollen is a natural substance with high proteins, carbohydrate, and a trace amount of vitamins and minerals.
(ii) It is used as a dietary supplement as tablets.
(iii) It increases the performance of athletes, racehorses and also heals burn wounds.

(i) It supplies nutrition to the developing microspores.
(ii) It contributes sporopollenin through ubisch bodies thus plays an important role in pollen wall formation.
(iii) The pollenkitt material is contributed by tapetal cells and is later transferred to the pollen surface.
(iv) Exine proteins responsible for 'rejection reaction' of the stigma are present in the cavities of the exine. These proteins are derived from tapetal cells

In a mature anther, the cells along with junction or the two sporangia of an anther lobe lack cellulose and lignin thickening. This region is called stomium. Stomium along with hygroscopic nature of Endothecium helps in the dehiscence of anther at maturity.