Q. No.The anther wall layer which is usually polyploid and has dense cytoplasm as well as high DNA content is
1. Endothelium
2. Tapetum
3. Epidermis
4. Middle layer
Which one of the following statements is not true?
| 1. | Exine of pollen grains is made up of sporopollenin |
| 2. | Pollen grains of many species cause severe allergies |
| 3. | Stored pollen in liquid nitrogen can be used in the crop breeding programmes |
| 4. | Tapetum helps in the dehiscence of anther |
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
In a stamen proximal end of filament is attached to
1. Anther.
2. Thalamus or petals.
3. Sepals.
4. Gynoecium.
A typical angiosperm anther is bilobed with each lobe having two theca i.e. dithecous. Theca is separated often by :
1. A longitudinal groove running lengthwise.
2. A longitudinal groove running breadth wise.
3. A transverse groove running breadth wise.
4. A transverse groove running lengthwise.
Which of the following statement is not associated with phenomenon of flowering?
(1) Decision for flowering takes place much before actual flower appears.
(2) During flowering several structural and hormonal changes takes place
(3) During flowering differentiation takes place
(4) Flowering is independent of environmental factors
The cells of which of the following layers of the anther wall are multinucleated due to endomitosis?
(1) Epidemis
(2) Endothecium
(3) Middle layer
(4) Tapetum
Match the column with respect to pollen grain:
|
Column I |
Column II |
||
|
a) |
Vegetative Cell Nucleus |
(i) |
Abundant Reserve Food & Irregular Nucleus |
|
b) |
Germ Pore |
(ii) |
Spindle shaped with dense cytoplasm |
|
c) |
Exine |
(iii) |
Where the Sporopollenin is absent |
|
(iv) |
Variable Pattern & design |
||
|
(v) |
Continuous layer made up of Cellulose & pectin |
1. a(iv), b(v), c(iii)
2. a(i), b(iii), c(v)
3. a(i), b(iii), c(iv)
4. a(iv), b(i), c(iii)
A typical angiosperm anther is dithecous which means that it is:
1. One lobed and the lobe has two theca
2. Two lobed and each lobe has two theca
3. Two lobed and each lobe has one theca
4. Four lobed and each lobe has two theca
A typical anther is
(a) Tetrasporangiate
(b) Tetragonal
(c) Trilobed
(d) Surrounded by four wall layers
The correct ones are
1. Only (a), (b) and (d)
2. Only (a) and (d)
3. Only (b) and (c)
4. All (a), (b), (c) and (d)
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