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.
Answers
Answer:
(a) The name of an alga X is spirogyra.
(b) The color of X (spirogyra) is shiny green color.
(c) The method of forming new algae by breaking from 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 same way as alga X 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 organism 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 that dejected arm undergoes fragmentation to develop into disc and other arms. The loss of the arm is due to accidents or as escape mechanism.
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Color of Spirogyra is Green
Explanation:
(a) Spirogyra (X)
(b) The color of spirogyra (X) is green.
(c) Breaking up of Parent Alga gives rise to New Algae, this process is called Fragmentation.
(d) Amoeba is a unicellular organism that reproduces by the asexual method called binary fission whereas alga is a multi cellular organism that reproduces by the asexual method called fragmentation.
(e) Sea anemone