NCERT Class 8 Science Chapter 8 Cell – Structure and Functions Extra Questions and Answers
Class 8 Science Chapter 8 Extra Questions and Answers – Cell – Structure and Functions. Here in this Page Class VIII Students can Learn Extra Questions & Answer 8th Chapter Science fully Inside.
We Provided Here Cell – Structure and Functions Science Chapter 8 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).
1) Fill in the blacks:
a) Onion cell are _____ cell. (Eukaryotic)
b) ____ is called the living substance of the cell. (Protoplasm)
c) Green colored plastids are called _____. (Chloroplasts)
d) ____ is a unit of inheritance in living organisms.(Gene)
2) Multiple choice questions:
a) Plant cell has ____ vacuoles?
a) Large b) Small
Ans. a) Large
b) Bacteria has _____ cell?
a) Eukaryotic b) Prokaryotic
Ans. b) Prokaryotic
c) Plastids are found only in ____ cells?
a) Plant cells b) Animal cells
Ans. a) Plant cells
d) The smallest cell is in ____?
a) Bacteria b) The egg of an ostrich
Ans. a) Bacteria
3) Answer the following questions:
a) What is nucleus? What is chromosomes?
Ans. The central dense round body in the center of a cell is called nucleus.
Nucleus contains thread-like structures called chromosomes.
b) What is the largest cell? What is cytoplasm?
Ans. The egg of an ostrich is the largest cell.
The jelly-like substance between the nucleus and the cell membrane is called cytoplasm.
c) Define prokaryotic cells and eukaryotic cells.
Ans. The cells having nuclear material without nuclear membrane are termed prokaryotic cells.
The cells having well-organized nucleus with a nuclear membrane are termed eukaryotic cells.
d) Give one example for each of multicellular and unicellular organisms.
Ans. Multicellular organism – human
Unicellular organism – bacteria
4) Mark your answer as per the codes provide below:
a) A: Cell wall, this additional layer surrounding the cell membrane is required by plants.
R: Plant cells need protection against variations in temperature, high wind speed, atmospheric moisture.
I.) Both A and R are true and R is the correct explanation of A.
II.) Both A and R are true but R is not the correct explanation of A.
III.) A is true but R is false.
IV.) A is false but R is true.
V.) Both A and R are false.
Ans. I. Both A and R are true and R is the correct explanation of A.
5) The size of the cells in living organisms may be as small as a millionth of a meter or may be as large as a few centimeters. However, most of the cells are microscopic in size and are not visible to the unaided eye. They need to be enlarged or magnified by a microscope. The smallest cell is 0.1 to 0.5 micrometer in bacteria. The largest cell measuring 170mm * 130mm, is the egg of an ostrich.
a) The size of the cell in bacteria is _____. (0.1 to 0.5 micrometer)
b) The largest cell is _____. (the egg of an ostrich)
c) The size of a cell of the egg of an ostrich is _____. (170mm * 130mm)
More extra Questions & Answers
Q.1) Fill in the blanks
1) Organisms made of more than one cell are called as Multicellular.
2) Each organ is further made up of smaller parts is called Tissues.
3) A Tissueis a group of similar cells performing similar function.
4) The central dense round body in the centre is called nucleus.
5) Nucleus contain thread like structure called as Chromosome.
6) Green coloured plastids are called chloroplasts.
7) Cells were first observed by Robert Hooke in 1965.
Q.2) Say whether the following statement are true or false.
1) The single saild organisms are called unicellular organisms
True
2.) The Jelly substance between nucleus and the cell membrane is called cell wall.
False
3.) the cell having nuclear material without nuclear membrane I termed as prokaryotic cells.
TRUE
4.) Several small coloured bodies in the cytoplasm of the cell which are scattered are called as plastids.
True
5.) Cell wall is present in animal cell.
False
6.) Gene is unit of inheritance in living organisms.
True
Q 3.) answer the following
1.) What does gene do?
Answer. gene controls the transfer of a hereditary characteristic from parents to offspring.
2.) What are prokaryotic cell?
Answer. the cell having nuclear material without nuclear membrane are called as prokaryotic cell.
3.) What is the size of cell?
Answer. The size of cell in living Organism may be as small as a millionth of a metre odd maybe as large as few centimetres. however most of the cell are microscopic in size and cannot be seen with naked eye.
4.) Explain the term pseudopodia.
Answer. the term pseudopodia is distinguish as pseudo means falSE an podia means feet.
5.) Distinguish with one example the term unicellular and multicellular.
Answer. 1.) the single celled organisms are called as unicellular.example. amoeba.
2.) organisms made of more than one cell are called as multicellular.
Example. Human
6.) What are the different parts of a cell?
Answer. the different parts of a cell is as below
cell membrane -The boundary of a cell is the cell membrane.
Cytoplasm – Cytoplasm is the Jelly like substance present between the cell membrane and the nucleus.
Nucleus – nucleus is an important component of the living cell it is generally spiritual and located in the centre of the cell.