Q. No.Which among the following is not a wall layer of microsporangium?
(1) Endothecium
(2) Nucellus
(3) Tapetum
(4) Middle layers
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.
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| 3. | The number and length of stamens are variable in flowers of different species.
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| 4. | In a longitudinal section, a typical microsporangium appears near circular in outline. |
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.
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
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.
The pollen grains are shed at two-celled stage in
(1) 80% angiosperms
(2) 40% angiosperms
(3) 30% angiosperms
(4) 60% angiosperms
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
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
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 |
Which among the following is not true about pollen grain?
(1) Rich in nutrients.
(2) Many species cause severe allergies and bronchial afflictions in some people often leading to chronic respiratory disorders– asthma, bronchitis, etc.
(3) Pollen consumption has been claimed to increase the performance race horses.
(4) Parthenium is used against pollen allergy.
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