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Question


Match the correct options
i) Encysted Amoeba a) Longitudinal binary fission
ii) Paramecium b) Multiple fission
iii) Euglena c) Transverse binary fission
iv) Ceratium d) Oblique binary fission


A
(i)➞b, (ii)➞c, (iii)➞d, (iv)➞a
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B
(i)➞b, (ii)➞c, (iii)➞a, (iv)➞d
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C
(i)➞d, (ii)➞c, (iii)➞a, (iv)➞b
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D
(i)➞c, (ii)➞d, (iii)➞ b, (iv)➞a
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Solution

The correct option is B (i)➞b, (ii)➞c, (iii)➞a, (iv)➞d
Organisms Mode of reproduction
Encysted Amoeba Multiple fission
Paramecium Transverse binary fission
Euglena Longitudinal binary fission
Ceratium Oblique binary fission

Asexual reproduction in bacteria occurs by irregular or simple binary fission during favourable condition. Amoeba also shows binary fission but during unfavourable conditions, Amoeba withdraws its pseudopodia and forms a three-layered covering around it called the cyst wall. At this time, Amoeba is said to be encysted. This encysted Amoeba, on the arrival of favourable conditions, divides by multiple fission and forms and several minute amoebae called pseudopodiospores. Each pseudopodiospore can develop into mature Amoeba.

Depending upon the plane of division, binary fission can be of the following types:

  • Simple binary fission or irregular binary fission: It can occur through any plane, e.g., Amoeba.

  • Longitudinal binary fission: The plane of division passes along the longitudinal axis of the organism, e.g., Euglena

  • Transverse binary fission: The plane of division is through the transverse axis of the organism, e.g., Paramecium

  • Oblique binary fission: The plane of division is oblique, e.g., Ceratium


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