Biology
Assertion (A): Euglena is an example of a unicellular, eukaryotic organism.
Reason (R): This organism is microscopic and has a well-defined nucleus.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Cell
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Answer
Both A and R are true and R is the correct explanation of A.
Reason — A is true as Euglena is a made up of a single cell, eukaryotic organism.
R is true because it has a well-defined nucleus and membrane-bound organelles.
Therefore, Both A and R are true and R is the correct explanation of A is the correct option.
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Abhay, a 9th grade student, is conducting a project for his school science fair. His task is to explore the structure of an animal cell. Abhay is particularly interested in learning about the different organelles that make up an animal cell. He starts by looking at animal cells under a microscope and comparing various organelles, inclusions and fluid material.
(a) Identify the organelle which is located near the nucleus and contains two short bundles of microfilaments arranged at right angles to each other.
(b) Which organelle is considered as the 'delivery system of the cell'?
(c) Cell membrane is composed of what material ?
(d) Give two examples of cell inclusions.
(e) Name the organelle which was seen by Abhay earlier in plant cells but lacking here in animal cells.