Write short note on
(i) Cytoplasm (ii) Nucleus of a cell
(iii) Pollutants
(iv) Meteor
Answers
Answer:
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Explanation:
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(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 structure called chromosomes. These carry genes and help in
inheritance or transfer of characters from the parents to the offspring.
c) pollutants: A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource. ... However, the degradation products of some pollutants are themselves polluting such as the products DDE and DDD produced from the degradation of DDT.
d) meteor:
A meteor is what you see when a space rock falls to Earth. It is often known as a shooting star or falling star and can be a bright light in the night sky, though most are faint. A few survive long enough to hit the ground. ... A rock that has not yet hit the atmosphere is called a "meteoroid".