NCERT Solutions for Class 8th Science
Chapter 8. Cell - Structure and functions
Text Book Exercise
Text Book Exercise:
Q4. Which part of the cell contains organelles?
Answer : Cytoplas m contains organelles of the cell.
Q5. Make sketches of animal and plant cells. State three differences between them.
Answer : Fig. 8.2. (a) Animal cell, (b) Plant cell.
Q6. State the difference between eukaryotes and prokaryotes.
Answer : Eukaryotes have well-organised nucleus with nuclear membrane while prokaryotes do not have this.
Q7. Where are chromosomes found in a cell? State their function.
Answer : Chromosomes are found in nucleus of the cell. They carry genes and help in inheritance i.e., transfer of characters from the parents to te offspring.
Q8. ‘Cells are the basic structural units of living organisms’. Explain.
Answer : Cells many Cells in the body acumulate to build tissue. Tissues form body organs and body organs form body system. All systems forms a body. As cells give shape to the body. This may be compared to bricks. Brickes are assembled to make a building. So, cell is called the basic structural unit of loiving organisms.
Q9. Explain why chloroplasts are found only in plant cells?
Answer : Chloroplast contain chlorophyll which synthesise food in plant by the process of photosynthesis. No photosynthesis occurs in animals. So, they do not contion chloroplasts.