The pollen grains are shed at two-celled stage in

(1) 80% angiosperms

(2) 40% angiosperms

(3) 30% angiosperms

(4) 60% angiosperms

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Which among the following is referred to as male gametophyte?

(1) tamen

(2) Anther

(3) Pollen grain

(4) microsporangia

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Which among the following is incorrect with respect to vegetative cell of pollen grain?

(1) It has irregularly shaped nucleus.

(2) It has abundant food reserve.

(3) It is spindle shaped with dense cytoplasm.

(4) It is bigger as compared to generative cell.

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A, B, C and D in the following diagram respectively are:

(1) Epidermis, endothecium, middle layers, tapetum

(2) Epidermis, middle layers, PMC, tapetum

(3) Endothecium, middle layers, microspore mother cells, tapetum

(4) Epidermis, middle layers, tapetum, PMC

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Match the following:

1

Male gametophyte

I

Embryo sac

2    

Female gametophyte   

II

Ovule

3

Megasporangium

III   

Pollen grains

4

Microsporangium

 

IV

Pollen sacs

(1) 1-III ; 2-I ; 3-II ; 4-IV

(2) 1-I ; 2-II ; 3-III ; 4-IV

(3) 1-IV ; 2-III ; 3-II ; 4-I

(4) 1-III ; 2-II ; 3-I ; 4-IV

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The following figure represents :

(1) Transverse section of young anther

(2) 3-d cut section of mature anther

(3) Cut section of filament

(4) Transverse section of mature filament

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The diameter of pollen grain generally varies from:

(1) 40-50 micrometers

(2) 25-50 micrometers

(3) 10-12 micrometers

(4) 8-25 micrometers

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The outer layer exine is made up of:

(1) Cellulose and pectin

(2) Peptidoglycan

(3) Cellulose

(4) Sporopollenin

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Which among the following is not a characteristic feature of sporopollenin?

(1) Sporopollenin is one of the most resistant organic material known.

(2) It can withstand high pressures.

(3) No enzyme that degrades sporopollenin is known.

(4) The exine exhibits a fascinating array of patterns and designs.

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Identify A, B and X :-

 X contains two cells - A and B. B is bigger than A, it has abundant food reserve and large irregularly shaped nucleus. A is small and floats in the cytoplasm of B. It is spindle shaped with dense cytoplasm and nucleus.

 

     A

       B

    X

(1)

Vegetative cell

Generative cell

Pollen grain

(2)

Generative cell

Vegetative cell

Pollen grain

(3)

Generative cell

Vegetative cell

Anther

(4)  

Generative cell   

Vegetative cell   

Filament

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