NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRev

NCERT Textbooks (Class 6 to Class 12)

Class 8 : NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRev

The document NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRev is a part of the Class 8 Course NCERT Textbooks (Class 6 to Class 12).
All you need of Class 8 at this link: Class 8

Exercises

Q1. Indicate whether the following statements are True (T) or False (F).
(a) Unicellular organisms have a one-celled body. ( )
(b) Muscle cells are branched. ( )
(c) The basic living unit of an organism is an organ. ( )
(d) Amoeba has an irregular shape. ( )

Ans:
(a) Unicellular organisms have a one-celled body. (True)
(b) Muscle cells are branched. (True)
(c) The basic living unit of an organism is an organ. (False)
(d) Amoeba has an irregular shape. (True)

Q2. Make a sketch of the human nerve cell. What function do nerve cells perform?
Ans:
NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRev

Human Nerve Cell

Nerve cells carry nerve signals from the brain to different organs and from different organs to the brain.


Q3. Write short notes on the following:

(a) Cytoplasm
(b) Nucleus of a cell

Ans:
(a)
 Cytoplasm 

  • The cytoplasm is the jelly-like substance present between the cell membrane and the nucleus. Various other components or organelles like Mitochondria, Golgi bodies, Ribosomes, etc. are present in the cytoplasm.NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRev
  • Cytoplasm helps the exchange and storage of substances among cell organelles.
  • Most of the metabolic activities occur inside the cytoplasm.

(b) Nucleus of a Cell

  • The nucleus is an important component of the living cell. It is mostly spherical and located in the center of the cell.NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRevPlant and Animal Cell
  • It is separated from the cytoplasm by a membrane called the nuclear membrane. 
  • In addition, the nucleus contains thread-like structures called chromosomes. These carry genes and help in the inheritance or transfer of characters from the parents to the offspring. 
  • The nucleus, in addition to its role in inheritance, acts as the control centre of the activities of the cell.


Q4. Which part of the cell contains organelles?
Ans: The cytoplasm contains cell organelles.

Q5. Make sketches of animal and plant cells. State three differences between them.
Ans:
NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRev

NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRev


Q6. State the difference between eukaryotes and prokaryotes.
Ans:
NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRev

Q7. Where are chromosomes found in a cell? State their function.
Ans. 

  • Chromosomes are found inside the nucleus of a typical cell. 
  • Chromosomes contain genes that are carriers of genetic information. NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRevChromosome
  • Chromosomes govern distinct features of an organism.
  • Chromosomes take part in cell division.


Q8. ‘Cells are the basic structural units of living organisms’. Explain.
Ans: Cells are the smallest units from which a living organism is made. A cell contains all the necessary structures which are required to carry out various biological processes. A group of cells makes a tissue which further makes organs and finally an organism. Thus, cells are called the basic structural unit of living organisms.

Q9. Explain why chloroplasts are found only in plant cells?
Ans: Chloroplasts are a type of plastids that contain chlorophyll. Chlorophyll is a green colour pigment that plays important role in photosynthesis. Since green plants need to prepare their food, hence chloroplast is present in them.NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRevStructure of Chloroplast


Q10. Complete the crossword with the help of clues given below:
Across-
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.
Down-
1. Green plastids.
2. Formed by a collection of tissues.

4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.

NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRevAns:
Across:
1. Chlorophyll
3. Organelle
6. Protoplasm
8. Genes
Down:
1. Chloroplast
2. Organ
4. Membrane
5. Vacuole
7. Tissue

NCERT Solutions - Cell Structure & Functions Class 8 Notes | EduRev

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