(a) What is the difference between the two asexual methods of reproduction : fission and fragmentation?
(b) Name one organism which reproduces by fission and another which reproduces by fragmentation.
(c) What is meant by multiple fission? Name one organism which reproduces by the process of multiple fission.
(d) Describe the process of reproduction in Hydra with the help of labelled diagrams. What is the name of this process of reproduction?
(e) Name one unicellular organism which reproduces by the same asexual process as Hydra.
(a) What is the difference between the two asexual methods of reproduction : fission and fragmentation?
(b) Name one organism which reproduces by fission and another which reproduces by fragmentation.
(c) What is meant by multiple fission? Name one organism which reproduces by the process of multiple fission.
(d) Describe the process of reproduction in Hydra with the help of labelled diagrams. What is the name of this process of reproduction?
(e) Name one unicellular organism which reproduces by the same asexual process as Hydra.
(a)
Fission Fragmentation Fission occurs in unicellular organisms. Fragmentation occurs in multicellular organisms.
(b) Amoeba reproduces by binary fission and Spirogyra reproduces by fragmentation.
(c) In multiple fission, the parent cell repeatedly divides to form innumerable organisms at the same time. Plasmodium reproduces by this method.
(d) Hydra reproduces by the method of budding. A small outgrowth called bud is formed on one side of its body by repetitive mitotic division. This bud gradually grows into a full hydra, developing its mouth and tentacles. The new Hydra detaches itself from its parent and starts living as a separate organism.
(e)Yeast reproduces by the same method as Hydra, i.e. budding.
(a)
| Fission | Fragmentation |
| Fission occurs in unicellular organisms. | Fragmentation occurs in multicellular organisms. |
(b) Amoeba reproduces by binary fission and Spirogyra reproduces by fragmentation.
(c) In multiple fission, the parent cell repeatedly divides to form innumerable organisms at the same time. Plasmodium reproduces by this method.
(d) Hydra reproduces by the method of budding. A small outgrowth called bud is formed on one side of its body by repetitive mitotic division. This bud gradually grows into a full hydra, developing its mouth and tentacles. The new Hydra detaches itself from its parent and starts living as a separate organism.
(e)Yeast reproduces by the same method as Hydra, i.e. budding.
