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प्रश्न
“Cell division is a type of reproduction in unicellular organism.” Justify.
Cell division is a type of reproduction in unicellular organisms. Comment.
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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 are absent in prokaryotes. Unicellular organisms are the simplest organisms. Therefore, cell division acts as the mode of reproduction and results in the production of daughter cells.
संबंधित प्रश्न
What is the function of a flower?
Where is the female gamete formed in flowering plants?
Name the part of a seed which grows into root.
Describe the process of fertilisation in a flower with the help of labelled diagrams.
The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.
(a) Name A. What are the various parts of A?
(b) Which part of A contains gametes?
(c) Name B. What is the swollen top of B known as?
(d) What does the swollen top of b contain?
(e) Out of A and B, which one is (i) male part, and (ii) female part of the flower?
Fill in the blanks:
A stamen consists of ______ and ________.
A student is asked to study the different parts of an embryo of pea seeds. Given below are the essential steps for the experiment :
(I) Soak the pea seeds in plain water and keep them overnight.
(II) Cut open the soaked seed and observe its different parts.
(III) Take some pea seeds in a petri dish.
(IV) Drain the excess water. Cover the seeds with a wet cotton cloth and leave them as it is for a day.
The correct sequence of these steps is
(A) III, I, IV, II
(B) III, IV, I, II
(C) III, I, II, IV
(D) III, II, I, IV
Find an odd one out.
The essential parts of a flower are ______.
Triple fusion involves ______.
