Question

Components of nucleus are
A. Karyotheca, nucleolus, chromatin and nuclear matrix
B. Nuclear envelope, nucleolus, chromatin and nucleoplasm
C. Nuclear envelope, nucleoplasm, chromatin
D. All the above

Answer 1

Hint:Nucleus represents a membrane-bound organelle containing the hereditary information responsible for controlling both the growth and reproduction cycle of the cell.

Complete answer:
The nucleus is found in all the eukaryotic cells of the plants and animals. The size of the nucleus is directly proportional to that of the cytoplasm. The nucleus is composed of the following structures:
Nuclear envelope or karyotheca: The nuclear membrane or karyotheca forms an envelope-like structure called a nuclear envelope around the nuclear contents. The nuclear envelope separates the nucleoplasm from the cytoplasm.
Nucleolus :The nucleus contains a large, spherical, and acidophilic dense granule as nucleolus. It was first described by Fontana in 1781. The nucleolus is composed of the following four zones - Granular, amorphous, fibrillar zone and nuclear associated chromatin
Nuclear matrix or nucleoplasm :The space between the nuclear envelope and the nucleolus is filled by a transparent, semisolid, granular substance or matrix known as nucleoplasm.
The chromatin fibres: The nucleoplasm contains many thread-like, coiled and much-elongated structures which take the basic stains such as basic fuchsin. These thread-like structures are known as chromatin fibres. During cell division ( meiosis and mitosis ) chromatin fibres become thick ribbon-like structures which are known as chromosomes.
Here Option D: As option A, B and C are correct, therefore, this is the correct option.

Additional information:The function of each of the components are,
Nucleolus - The main function is the biogenesis of ribosomes. It stores all the proteins of ribosomes.
Chromatin fibers - They contain the genetic material, the DNA which ultimately influences all the biological phenomena at molecular, physiological and gross morphological levels.
Nucleoplasm - Act as a suspension medium for components of the nucleus.
Nuclear envelope - It allows free exchange of ions between the nucleus and the cytoplasm.

Thus, the correct answer is option (D) All of the above.

Note:The various functions of nucleus are,
>The nucleus represents a site responsible for the initiation of the genetic transcription from the translation spot within the cytoplasm.
>It is responsible for exhibiting its control over the organism hereditary characteristics.
>The organelle participates in varied processes such as cell division, protein synthesis, growth, and cellular differentiation.