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प्रश्न
“Cell division is a type of reproduction in unicellular organism.” Justify.
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उत्तर
In unicellular organisms all the important functions are carried out by the single cell because they lack all cellular organelles. The two types of reproduction i.e sexual and asexual need the involvement of many organelles and biomolecules . Hence, these modes of reproduction is absent in prokaryotes. Unicellular organisms are the simple organisms. Therefore, cell division acts as the mode of reproduction and results in the production of daughter cells.
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संबंधित प्रश्न
(i) Name the part marked 'A' in the diagram.
(ii) How dose 'A' reachese part 'B'?
(iii) State the importance of the part 'C'.
(iv) What happens to the part marked 'D' after fertilisation is over?
Fill in the following blank with suitable word :
Pollen grains contain ............ gametes of a plant.
Explain the terms 'self pollination'
Fill in the blanks:
A stamen consists of ______ and ________.
Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label (i) ovary, (ii) male germ-cell, (iii) female germ-cell and (iv) ovule on it.
List any two differences between pollination and fertilization.
Fill in the blanks and rewrite the completed statements:
Lymph flows in _______________ direction.
Define.
Inflorescence
How many middle layers are generally present in the wall of the anther lobes?
The number of pollen sacs in a dithecous anther is ______.
