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WorksheetsClass XII Biology quiz chapter 2
Total questions: 15
Worksheet time: 8mins
What does the microsporangia develop into?
Pollen grain
Pollen tube
Pollen sac
Pollen mother cell
In a trnsverse section, a typical microsporangium appears in outline as
Rectangular
Longitudinal
Circular
Oval
Identify the homogeneous group of cells which occupy the centre of each microsporangium.
Nucellus
Synergid cells
Sporogenous tissue
Megaspore mother cell
This layer has a role in nourishing the developing pollen grains. Identify the layer.
(a)
After meiotic divisions, what do the cells of the sporogenous tissue form?
The microspores ultimately dissociate from each other to form
The .............. represent the male gametophyte
Stamen
Pollen grains
Pollen sac
Anther
The appertures on the pollen grain exine where sporopollenin is absent is called...................
The intine of pollen grain is a thin layer made up of ......... and ........
In over 60% angiosperms pollen grains are shed at this stage........
3 celled
2 celled
7 celled 8 nucleate
8 celled 7 nucleate
This plant came to india as a contaminant with imported wheat. It is a major cause of pollen allergy. Identify the plant.
Cymbopogon
Oxalis
Parthenium
Dandelion
What is so specific about the three families Rosaceae, solanaceae and leguminoseae with respect to pollen viability?
At what temperature are pollen grains stored in pollen banks?
-78°C
-186°C
-192°C
-196°C
At maturity, a typical angiosperm embryo sac is ...........nucleate.........celled stage.
Name the structure that guides the pollen tubes into the synergids.......
