A filamentous alga X is found in ponds, lakes and slow-moving streams. The filament of this alga simply breaks into two (or more) pieces on maturing and each piece then grows to become a complete new alga.
(a) Name an alga which X is likely to be.
(b) What is the colour of X?
(c) What is the method of forming new algae by the breaking of parent alga known as?
(d) An Amoeba also breaks up to form two daughter Amoebae. What is the difference in the splitting of Amoeba and splitting of this alga as a method of reproduction?
(e) Name one marine animal which reproduces in the same way as alga X.
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Answer:
A. blue - green algae.
B. green .
C. fermentation.
D. amoeba reproduce by binary fission and algae reproduce by fermentation
E. spirogyra.
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(a) The name of an alga X is spirogyra.
(b) The colour of X of spirogyra is shiny green colour.
(c) The method of forming new algae by the breaking of parent alga is known as fragmentation.
(d) An Amoeba also breaks up to form two daughter Amoebae. The difference in the splitting of Amoeba and splitting of this alga as a method of reproduction is it takes place in unicellular and multicellular organisms.
(e) The marine animal which reproduces in the fragmentation as alga X (spirogyra) is star fish.
Explanation:
- Spirogyra is a spiral shaped algae which generates in wet weather. The cell wall of the spirogyra includes cellulose (outer membrane) and pectin (inner membrane). This algae does not form any gametes during reproduction.
- Fragmentation is an asexual reproduction in which the children organism splits from the parent organism. The children organism grows into fully matured organisms which looks similar to parent organisms.
- The reproduction of an organisms depends on the complexity of the organisms. The unicellular organisms undergo asexual reproduction. The multicellular organisms undergo sexual and asexual reproduction.
- Starfish can lose an arm and the dejected arm undergoes fragmentation and develops disc and other arms. The loss of the arm is due to accidents and also used as escape mechanism.
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