Question

They were earlier believed to be, "microscopic unicellular plants without chlorophyll which multiply by
fission".
(a) Bacteria
(b) Viruses
(C) Fungi
(d) Algae​

Answer 1

Answer:

The answer is option (a) bacteria as bacteria reproduces through the process of binary fission. They are also termed as microscopiic unicellular organisms by nature.

Answer 2

Explanation:

Here we have a statement or belief from the past about a microorganism, and the statement is:

"Microscopic unicellular plants without chlorophyll which multiply by fission. "

In the sentence, the key points to remember:

• Microscopic
• Unicellular
• Without Chlorophyll
• Multiply by fission

Now based on these features, Let's take a look on the given options and find the microorganism in it.

• Viruses - They are microscopic and unicellular. They also don't have Chlorophyll but at that time, it was too difficult to observe their reproduction. They grow inside the host cell, so we can't say that they grow by fission. So, this is not the answer.

• Fungi - Fungi can be unicellular or multicellular. Also, some of them can be seen with naked eyes. So, the option is also not correct.

• Algae - Algae can be small or big, sometimes they are visible when they are bulk. But most importantly, they have Chlorophyll. So, this is not the answer.

So, we are left with Bacteria. Bacteria are microscopic and were discovered earlier also. They are unicellular and that time it was believed that, none of them were having Chlorophyll. Hence, the correct answer is:

$\Large{ \boxed{ \bf{ \green{Bacteria(A)}}}}$

━━━━━━━━━━━━━━━━━━━━