Question

CELL - STRUCHRE AND FUNCTIONS
Class 8 Science
Full chapter important points
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Answer 1

Cell structure

Ideas about cell structure have changed considerably over the years. Early biologists saw cells as simple membranous sacs containing fluid and a few floating particles. Today's biologists know that cells are infinitely more complex than this.

Illustration showing the structure of a cell

There are many different types, sizes, and shapes of cells in the body. For descriptive purposes, the concept of a "generalized cell" is introduced. It includes features from all cell types. A cell consists of three parts: the cell membrane, the nucleus, and, between the two, the cytoplasm. Within the cytoplasm lie intricate arrangements of fine fibers and hundreds or even thousands of miniscule but distinct structures called organelles.

Cell Function

Cells provide six main functions. They provide structure and support, facilitate growth through mitosis, allow passive and active transport, produce energy, create metabolic reactions and aid in reproduction.

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Answer 2

(i) Each organ in the living organisms performs different functions such as digestion, assimilation and absorption. ... A tissue is a group of similar type cells performing a particular function. Parts of the Cell: The basic components of a cell are cell membrane, cytoplasm and nucleus.