There are four tiny organisms A, B, C and D. The organism A is a parasitic protozoan which causes a disease known as kala-azar. The organism B is a microscopic single-celled animal which causes malaria disease in human beings. The organism C is a unicellular animal which can change its body shape according to need, it has no fixed shape. The organism D is also a unicellular animal which is slipper-shaped having a large number of tiny hair all around its body.

(d) What name is given to the asexual method of reproduction of (i) organism A, and (ii) organism B?

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Solution

●Organism A, Leishmania reproduces by binary fission along the longitudinal axis.
●Organism B, Plasmodium reproduces by multiple fission.

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There are four tiny organisms A, B, C and D. organism A is a parasitic protozoan that causes a disease known as kala-azar. The organism B is a microscopic single-celled animal that causes malaria disease in human beings. The organism C is a unicellular animal that can change its body shape according to need, it has no fixed shape. The organism D is also a unicellular animal that is slipper-shaped having a large number of tiny hair all around its body.
(a) Name the organisms A, B, C and D
(b) Name one characteristic body feature of organism A.
(c) Name the insect which carries organism B and transmits it from one person to another.
(d) What name is given to the asexual method of reproduction of (i) organism A, and (ii) organism B?
(e) Where do organisms C and D live?

Two very small organisms X and Y both reproduce by the method of budding. Organism X is industrially very important because it is used in making alcohol from sugar. It is also used in making bread. Organism Y is a tiny animal having tentacles which lives in water.

(a) What is organism X ?

(b) Name the process in which X converts sugar into alcohol.

(d) what is organism Y ?

(e) Out of X and Y, which organism is multicellular and which one is unicellular ?

There are four tiny organisms A, B, C and D. The organism A is a parasitic protozoan which causes a disease known as kala-azar. The organism B is a microscopic single-celled animal which causes malaria disease in human beings. The organism C is a unicellular animal which can change its body shape according to need, it has no fixed shape. The organism D is also a unicellular animal which is slipper-shaped having a large number of tiny hair all around its body.

(b) Name one characteristic body feature of organism A.

(a) Name the organisms A, B, C and D

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Fission

Standard X Biology

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●Organism A, Leishmania reproduces by binary fission along the longitudinal axis. ●Organism B, Plasmodium reproduces by multiple fission.

●Organism A, Leishmania reproduces by binary fission along the longitudinal axis.
●Organism B, Plasmodium reproduces by multiple fission.