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Origin and the Evolution of Life on Earth

The first ste...

Question

The first step in the evolution of animals was to attain _____

A

Organisation of nucleus

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B

Cellular organisation

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C

Multicellularity

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D

Tissue level of organisation

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Solution

The correct option is C
Multicellularity

The advent of animals was triggered by attempting to attain multicellularity repeatedly (over 46 times) until the 46th attempt when the first animal life form took shape.

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Similar questions

Match the following list of animals with their level of organisation:

Animal	Level of organisation
A. Pheretima	I. Organ level
B. Fasciola	II. Cellular level
C. Spongilla	III. Tissue level
D. Obelia	IV. Organ system level

Q. Match the following list of animals with their level of organisation.

\begin{matrix} Level of organisation & Animal A. Organ level & 1. Pheretima B. Cellular aggregate level & 2. Fasciola C. Tissue level & 3. Spongilla D. Organ System level & 4. Obelia \end{matrix}

Q. Which of the following statements are true/false?
I. In higher phyla cellular level of organisation is seen.
II. Phylum Platyhelminthes have cellular level of organisation.
III. Cellular level of organisation is seen when the cells are not arranged as loose cell aggregates.
IV. Molluscs exhibit tissue level of organisation.

Q. Which of the following are correct?
(i) Sponges : Cellular level of organisation
(ii) Cnidaria : Tissue level of organisation
(iii) Platyhelminthes : Organ level of organisation
(iv) Annelids, Arthropods, Molluscs, Echinoderms and Chordates : Organ system level of organisation.

Q. Which animals are known for cellular level of body organisation?

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