Question

The mature filament of _____________divides into many pieces and each piece develops into a new individual.

1) spirogyra

2) Amoeba

3) Paramoecium

4) Both 1 and 3

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Answer 1

Explanation:

The question is based on reproduction of lower level organisms which shows different mode of reproduction like Binary Fission, Fragmentation, Budding etc.

Here a mature adult fragment divides to develop into a new individual. This process is called Fragmentation. It is quite common in very simple multicellular organisms like Algae, fungi etc.

So, let's see the options:

1) Spirogyra

• It is a simple green filamentous algae which have a elongated body and this body divides into fragment to produce new individual. It shows Fragmentation. Thus, this is correct✓.

2) Amoeba

• It is an unicellular protozoan which divides by fission process in which it's body is divided into two daughter cells or more daughter cells under unfavorable condition. Thus, this is incorrect.

3) Paramecium

• It is also an unicellular protozoan which divides same by the process of fission. The daughter cells are divided from the main body of parent. Thus, this is incorrect.

As we can see that only Spirogyra shows fragmentation. Paramaecium doesn't shows. So, option 4) which says that 1) and 3) is the not the correct option.

Hence, the correct option is:

$\huge{ \boxed{ \bf{ \red{Option \: A}}}}$

And we are done !!

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