23. Write short notes on the following:
(a) Cytoplasm
Nucleus
nuclear membrane
nuclearplasma
nucleolus
chromatin fibers
Answers
Answer:
(a) Cytoplasm
●Cytoplasm is a jelly-like substance between the nucleus and the cell membrane.
●Various cell organelles like ribosomes, mitochondria, endoplasmic reticulum, etc. are suspended in the cytoplasm.
●It helps in exchange and storage of substances among cell organelles.
●Most of the metabolic reactions also occur inside cytoplasm.
(b) Nucleus of a cell
●The spherical round body present in the centre of the cell is called nucleus.
●It is an important component of the living cell.
●Nucleus is separated from the cytoplasm by a membrane called the nuclear membrane.
●The nuclear membrane is porous and allows the movement of materials between the cytoplasm and nucleus.
●The nucleus consists of a spherically shaped dense mass called nucleolus. Nucleus also contains thread-like structures called chromosomes. These carry genes and help in inheritance or transfer of characters from the parents to the offspring.
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Answer:
the cytoplasm is the fluid content inside the plasma membrane. it also contains many specialised cell organelles. Each of these organelles performs a specific function for the cell.(b) nucleus: the nucleus ia an organelles found in eukaryotic cells. inside membrane , it contain the majority of the cells genetic materials. This material is organized as DNA molecules,along with a variety of proteins, to form chromosome.(c) nuclear membrane: A nuclear membrane is a double membrane that encloses the cell nucleus. It serves to separate the chromosomes.