Which among the following is not a wall layer of microsporangium?

(1) Endothecium

(2) Nucellus

(3) Tapetum

(4) Middle layers

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All of the following statements are correct except:

(1) The proximal end of the filament is attached to the thalamus or the petal of the flower.

(2) The anther is a four-sided structure consisting of four microsporangia, two in each lobe.

(3) The number and length of stamens are variable in flowers of different species.

(4) In a longitudinal section, a typical microsporangium appears near circular in outline.

Concept Questions :-

Stamen: Anther
Stamen: Microsporangium
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Which among the following statement is incorrect with respect to tapetum?

(1) It nourishes developing pollen grains. 

(2) It has dense cytoplasm.

(3) It is the innermost wall layer of microsporangia.

(4) Cells have single nucleus only. 

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How tapetal cells become binucleate?

(1) Meiosis-I

(2) Mitosis

(3) Endomitosis

(4) Eumitosis

Concept Questions :-

Stamen: Anther
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Match the following:

1   

Sporogenous tissue    

I

Process of formation of microspores from PMC by meiosis

2

Microspore tetrad

II

Microspores arranged in cluster of four cells

3

Microsporogenesis

III

Formation of microspore tetrad by meiosis

4

Tapetum

IV   

Nourishes pollen grains

(1) 1-III ; 2-I ; 3-II ; 4-IV 

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

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

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

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Which among the following is incorrect with respect to microsporogenesis? 

(1) The cells of the sporogenous tissue undergo mitotic divisions to form microspore tetrads.

(2) Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad. Each one is a potential pollen or microspore mother cell (PMC).

(3) The microspores are arranged in a cluster of four cells called as the microspore tetrad.

(4) Inside each microsporangium several thousands of microspores or pollen grains are formed that are released with the dehiscence of anther.

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The inner wall of pollen grains is made up of 

(1) Sporopollenin

(2) Cellulose and pectin

(3) Peptidoglycan

(4) Cellulose only

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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.

Concept Questions :-

Stamen: Male Gametophyte
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