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# Sexual Reproduction in flowering Plants

#### Multiple Choice Questions

1.

If there are 4 microspore mother cells in an anther, what will be the number of pollen grains?

• 4

• 8

• 12

• 16

D.

16

Each microspore mother cell divides meiotically to form 4 pollen grains (4 $×$ 4 = 16).

2.

When the filament runs throughout the length of anther, it is called

• dorsi fixed

• versatile

• syngenesious

A.

In adnate type of filament attachment, the filament runs throughout the length of anther. It is found in Ranunculus.

3.

Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of

• cutin

• suberin

• sporopollenin

• callose

C.

sporopollenin

Exine is outer layer of pollen grain which is acetolysis resistant layer. It is also resistant to physical and biological degradation. Because of this property of exine, pollen grains are found well preserved for long periods in fossil deposits.

Cutin is a waxy repellant substance in the cuticle of plants, consisting of higly polymerized esters of fatty acids.

Suberin is an  inert impermeable waxy substance present in the cell walls of corky tissues.

Callose is a plant polysaccharide. It plays an important in plant development.

4.

Elater mechanism for seed dispersal is exhibited by

• Riccia

• Dryopteris

• Funaria

• Marchantia

D.

Marchantia

Marchantia is a liverwort. Its sporophyte contains elongated cells with spiral thickenings on its wall called elaters. These elaters are hygroscopic in nature. The resulting twisting movement helps dispersal of spores.

5.

During formation of which of the following free nuclear division occurs?

• Flower

• Endosperm

• Gametes

• Fruit

B.

Endosperm

In nuclear endosperm the primary endosperm nucleus divides repeatedly without wall formation producing a large number of free nuclei. It is most common type of endosperm.

6.

Assertion : Many visitors to the hills suffer from skin and respiratory allergy problem.

Reason : Conifer trees produce a large quantity of wind-borne pollen grains.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

B.

If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

Some trees of hill like oak, ash, elm, hickory, pecan and mountain cedar produce allergic pollen grains which cause allergy to people. Signs and Symptoms of pollen allergy are
(i) sneezing

(ii) itching eyes, nose and throat

(iii) dark circles under the eyes caused by restricted blood flow near the sinuses

(iv) watering eyes

(v) conjunctivitis

Conifer trees produce a large quantity of wind borne pollen grains because many pollen grains are destroyed in the process of pollination done by wind.

7.

Assertion : The two cotyledons in the seed are often referred to as the embryonic leaves.

Reason : The embryo contains radicle and plumule.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

B.

If both the assertion and reason are true but reason is not the correct explanation of assertion.

In a typical angiospermic plant, cotyledons in the seed are the embryonic leaves. The radicle of the embryo upon the seed germination produces the root system and the plurnule produces the shoot system. The radicle and plumule are contained in the embryo.

8.

Assertion : The megaspore mother cell undergoes mitosis to produce four megaspores.

Reason : Megaspore mother cells and the megaspores are both haploid.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

D.

If both the assertion and reason are false.

The diploid megaspore mother cell has a large nucleus and dense cytoplasm. This cell undergoes meiosis (reduction division) to produce a group of four haploid cells called megaspores.

9.

Xenia and metaxenia terms are related with

• pollen culture

• xylem and phloem

• endosperm

• embryo

C.

endosperm

The direct or indirect effect of male parent (pollen grain) on structures inside embryo sac except embryo is knoqn as xenia.

Metaxenia may be defined as the effect of pollen on the seed coat or pericarp lying outside the embryo sac.

10.

Megasporophyll of Cycas has the same nature as

• stamen

• petal

• sepal

• carpel

D.

carpel

Megasporophyll of Cycas are borne on female plant which produces ovule. Carpel is also a female reproductive organ of flowering plant. Hence, they both are of same nature. (i.e. female sex organs).