Chapter 1 (Biology & its Major Fields of Special.) 1st Year Short Questions

Write a short note on cloning.

Cloning is a technology for achieving eugenic aims A clone is defined as a cell or individual and all its asexually produced offspring. All members of a clone are genetically identical except when a mutation occurs. Generally no normal animal reproduces naturally by cloning. Several insects and many plants do, in some circumstance whereas few do so regularly.

Give the significance of the study of the fossil.

We know about extinct groups like dinosaurs, ammonites and trilobites through fossils. Some animals and plant are only known to us as fossils. By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other.

Name macromolecules. Why they form structure of cells?

Proteins, carbohydrates, nucleic acids, and lipids are the four major classes of macromolecules. Macromolecules are made up of single units known as monomers that are joined by covalent bonds to form larger polymers. They are most stable and energetic compounds so involved in the formation of cellular structures.

Define biosphere.

The part of earth’s surface and atmosphere where living organisms are found. is called biosphere.

Define species.

A group of closely related organisms that are very similar to each other and are usually capable of interbreeding and producing fertile offspring.

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