Chapter 12
Patterns in Life: Diversity and Classification
CBSE Class 9
Science Solutions
Educart Science class Class 9 NCERT Exemplar cover
Question:

You find an unlabelled slide of a single-celled organism that has a well-defined nucleus and multiple cilia. Which group would it most likely belong to? Give reasons.

Answer: Verified

The organism most likely belongs to Kingdom Protista, specifically to the group of ciliated protozoans (for example, Paramecium).

Reasons:

(1) It possesses a well-defined nucleus, showing that is eukaryote. This rules out Kingdom Monera, whose members are prokaryotes and lack a membrane-bound nucleus.

(2) The organism is single-celled (unicellular), which rules out Kingdom Plantae and Animalia whose members are multicellular.

(3) Kingdom Protista includes all unicellular eukaryotic organisms. The presence of multiple cilia is a defining feature of ciliated protists such as Paramecium, which use cilia for locomotion and feeding.

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More NCERT Questions
An earthworm (annelida) and a beetle (arthropoda), both have segmented bodies but the beetle has a hard external skeleton. How does the beetle's external skeleton help it survive? [Pg. No. 242] Does the term 'biodiversity' relate only to the variety of organisms, or does it encompass other elements? [Pg. No. 247] Sponges represent one of the simplest animal body plants. Their bodies lack true tissues and organs. Which feature of sponge cells supports its classification under the animal kingdom? (a) Absence of Meena and Hari observed an animal in their garden. Hari called it an insect while Meena said it was an earthworm. Choose the correct option which confirms that it is an insect. (a) Bilateral symmetric