Biology
Assertion (A): Chromosomes carry hereditary information from parents to offspring.
Reason (R): Chromosomes are suspended in the cytoplasm of each cell whether its a plant cell or an animal cell. Chromosomes are composed of RNA threads.
- 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
A is True and R is False.
Reason — A is True because chromosomes carry hereditary information in the form of genes, which are passed from parents to offspring.
R is False as chromosomes are located in the nucleus, not suspended in the cytoplasm. They are made up of DNA and proteins not RNA.
Therefore, A is True and R is False 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.