Question

The organelle that control all activities of the cell:

(a) nucleus

(b) vacuole

(c) plastids

(d) cytoplasm


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Answer 1

$\huge\bf\underline\blue{Answer}$

$\bf\huge\boxed{(a) Nucleus}$

Explanation:-

The Nucleus is the portion of protoplasm which have maximum density and is deeply stained. It is bounded by a double layered membrane. Nucleus is present in all types of shell except matured Red blood cells of the class Mammalia and sieve tubes of angiosperms.

The nucleus is made up of four parts, they are:-

1. Nuclear membrane - It separates the nucleoplasm from the cytoplasm. The structure of nuclear membrane is similar to the structure of cell membrane.
2. Nucleolus - It remains attached to the chromatin fibers at a particular region. The nucleus is a dense granular structure and is made up of Ribonucleic acid (RNA).
3. Nuclear Reticulum - It is a rid shaped structure made up of DNA, chromatin fibers and proteins.
4. Nucleoplasm - The structure is similar to cytoplasm. DNA and RNA synthesizes in this site.

Answer 2

Answer:

a) Nucleus

Explanation:

• It is the control centre in the cell.
• It is covered by an envelope and inside there is an nucleolous and chromatin which forms chromosomes during cell division.
• Nucleolous mainly contain RNA [ Ribonucleic acid] and it helps in protein synthesis in the cytoplasm.
• Nucleus contain all the information which is necessary for the cell to function and to reproduce further cells of the next generation.