Question

specific excretory organs are absent in unicellular organisms belongs to phylum:
A) porifera
B) Annelida
C) protozoa
D) echinodermeta​

Answer 1

Answer:

Porifera, this organisms doesn't have specific excretory organs.

They excrete through water baths almost all their cells.

Answer 2

The answer will be as follows:

The specific excretory organs are absent in unicellular organisms belonging to the phylum C). Protozoa.

• The unicellular organisms under the phylum Protozoa lack true excretory organs.
• Instead, they have a contractile type of vacuole present inside their cells.
• These contractile vacuoles help in excretion. They help in gathering water filled with toxic and waste substances and transport it out of the cells.
• These vacuoles perform the process of diffusion to excrete the waste substances out of the protozoan cells.

Hence, the correct option chosen to answer the question will be:

C). Protozoa is the phylum with unicellular organisms where specific excretory organs are absent.

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