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.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.
Cell
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Answer
A is True and R is False.
Reason — Chromosomes carry hereditary information in the form of genes, which are passed from parents to offspring. Chromosomes are located in the nucleus, not suspended in the cytoplasm. They are made up of DNA and proteins not RNA.
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Given below is the structure of nucleus of a cell. Read the information below the diagram and fill in the blanks:
Nucleus is the most important part of the cell. It is located in the central area in animal cells but pushed towards the periphery in plant cells due to the presence of a large vacuole in the centre. It regulates and coordinates various life processes of the cell and also plays an important role in cell division.
Nucleus has a delicate, protective surrounding layer (a) …………… which is filled with a relatively dense fluid (b) …………… . There are certain thread-like structures suspended in the fluid called (c) …………… . These thin thread-like fine structures become thick and ribbon-like during the time of cell division. These prominent ribbon-like structures are called (d) …………… .Nucleus contains a spherical, dense body inside it, called as (e) …………… which participates in protein synthesis.
Given below is the structure of a plant cell. Match the structures marked (a) to (e) with the clues given for each: Example : (f) : Synthesis and secretion of enzymes,hormones, etc.
