Q. No.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 free nuclear divisions?
1. Epidemis
2. Endothecium
3. Middle layer
4. Tapetum
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
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 |
What is the charasteristic of tapetum ?
1. It does not store food.
2. It is multi-nucleated.
3. It is multi-layered structure.
4. It nourishes the megaspore.
What is the number of microsporangia in each lobe of an angiosperm anther?
1. Four
2. Two
3. Eight
4. One
Which among the following extend longitudinally to become pollen sac?
1. Microsporangia
2. Filament of anther
3. Tapetum
4. Endothecium
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
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.
Four statements are given below. How many of them are correct?
(1) The anther is a tetragonal structure, with four microsporangia at corners, two in each lobe.
(2) Microsporangia develops further and becomes a pollen sacs.
(3) A typical microsporangia is surrounded by four layered wall, 3-protective and 1 nutritional.
(4) The nutritive layer is densely cytoplasmic with more than one nucleus
Options :
1. 3
2. 4
3. 2
4. 1
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