{"id":13103,"date":"2020-10-12T17:26:44","date_gmt":"2020-10-12T11:56:44","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=13103"},"modified":"2020-10-12T17:26:44","modified_gmt":"2020-10-12T11:56:44","slug":"cell-structure-and-functions-class-8-extra-questions","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/cell-structure-and-functions-class-8-extra-questions\/","title":{"rendered":"Cell Structure and Functions Class 8 Extra Questions and Answers Science Chapter 8"},"content":{"rendered":"

Cell Structure and Functions Class 8 Extra Questions and Answers Science Chapter 8 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science<\/a> Question bank on a regular basis.<\/p>\n

Class 8 Science Chapter 8 Extra Questions and Answers Cell Structure and Functions<\/h2>\n

Extra Questions for Class 8 Science Chapter 8 Cell Structure and Functions with Answers<\/strong><\/p>\n

Cell Structure and Functions Class 8 Extra Questions Very Short Answer Type<\/h3>\n

Question 1.
\nList some of the basic functions carried out by all living organisms.
\nAnswer:
\nGrowth and development, movement, digestion, respiration, excretion, reproduction, etc.<\/p>\n

\"Cell<\/p>\n

Question 2.
\nWhat is a cork?
\nAnswer:
\nCork is a part of the bark of a tree.<\/p>\n

Question 3.
\nWhat is meant by cell in Latin?
\nAnswer:
\nCell in Latin means \u201chollow space\u201d.<\/p>\n

Question 4.
\nWhat instrument helped in studying the living cells ?
\nAnswer:
\nMicroscope helped in studying the living cells.<\/p>\n

Question 5.
\nHow many cells are there in a human body ? What about their shape and size ?
\nAnswer:
\nHuman body has trillions of cells, which vary in shape and size on the basis of their functions.<\/p>\n

Question 6.
\nWhat is the name of organism made of more than one cell?
\nAnswer:
\nThey are called multicellular.<\/p>\n

Question 7.
\nWhat is meant by unicellular organisms?
\nAnswer:
\nThe single-celled organisms are called unicellular organisms, (uni = one, cellular = cell).<\/p>\n

\"Cell<\/p>\n

Question 8.
\nWhat is the size of cell of a bacteria?
\nAnswer:
\n0.1 to 0.5 micrometre (mm).<\/p>\n

Question 9.
\nWhat is tissue?
\nAnswer:
\nTissue is a group of similar cells performing a specific function.<\/p>\n

Question 10.
\nIs cell wall present or absent in animal cell?
\nAnswer:
\nIt is absent.<\/p>\n

Question 11.
\nWhen can chromosomes be seen?
\nAnswer:
\nThe chromosomes can be seen only when the cell divides.<\/p>\n

Question 12.
\nName two organisms which are made of single cell.
\nAnswer:
\nAmoeba and Paramecium.<\/p>\n

Cell Structure and Functions Class 8 Extra Questions Short Answer Type 1<\/h3>\n

Question 1.
\nWhen you cut your hair and nail, you do not feel pain. Why?
\nAnswer:
\nWhen nail and hair are cut, we do not feel any pain because the cells of nails and hair are dead cells.<\/p>\n

Question 2.
\nWhy are we able to know a lot about cell structure today?
\nAnswer:
\nToday, we know a lot about cell- structure and its functions because of the improved microscopes having higher magnification.<\/p>\n

\"Cell<\/p>\n

Question 3.
\nHow are cells in the living organisms arranged?
\nAnswer:
\nThe cells in the living organisms are arranged in the similar manner as bricks are arranged to make a building.<\/p>\n

Question 4.
\nWhat are basic structural units in buildings and living organisms ?
\nAnswer:
\nBricks in buildings and cells in the living organisms are the basic structural units.<\/p>\n

Question 5.
\nDoes egg of a hen represent a single cell ?
\nAnswer:
\nYes, egg of a hen represents a single cell and is big enough to be seen by unaided eye. _<\/p>\n

Question 6.
\nWhile studying living cells with microscope, why do we use stains ?
\nAnswer:
\nStains (dyes) are used to colour the parts of the cell to observe and study their detailed structure clearly under microscope.<\/p>\n

Question 7.
\nWhat is the difference between the functions of organisms with one cell and the organisms with multi cells?
\nAnswer:
\nA single-celled organism captures and digests food, respires, excretes, grows and reproduces with its single cell. Similar functions in multicellular organisms are carried out by groups of specialised cells forming different tissues which in turn form organs.<\/p>\n

Question 8.
\nWhat are the projections in Amoeba called? What do they do?
\nAnswer:
\nThe projections in Amoeba are known as pseudopodia (pseudo = false; podia = feet). These projections are in fact false feet and these appear and disappear as Amoeba moves or feeds.<\/p>\n

\"Cell<\/p>\n

Question 9.
\nWhat is the size of cells in living organisms.
\nAnswer:
\nThe size of cells in living organisms may be as small as a millionth of a metre or a few centimetre. However, most of the cells are microscopic in size and are not visible to the unaided eye.<\/p>\n

Question 10.
\nWhat is the size of smallest cell? What is the size of red blood cells (RBCs) found in the human body?
\nAnswer:
\nThe size of the smallest cell is 0.1 to 0. 5 micrometres (pm) found in bacteria and that of red blood cells in the human body measure seven micrometres.<\/p>\n

Question 11.
\nGive example of a large cell. State the size of the largest cell.
\nAnswer:
\nThe hen\u2019s egg is an example of large. cell, which is quite large that it can be seen by an unaided eye. The largest cell, measuring 170 x 130 mm, is the egg of an ostrich.<\/p>\n

Question 12.
\nWhat are white and yellow parts of an egg called?
\nAnswer:
\nIn an egg, a white material surrounds the yellow part. The white material is called albumin, and the yellow component is called yolk.<\/p>\n

\"Cell<\/p>\n

Question 13.
\nDefine the terms tissue and organ.
\nAnswer:<\/p>\n