Question

Q1. Describe the structure and functions of nucleus.
Q2. How is mitochondria important for a cell ?
Q3 .Describe the structure and functions of the two types of endoplasmic reticulum.
Q4.Why are lysosomes called as suicide bags ?
Q5. Plastids are present only in plants .Comment .
Q6. Differentiate between a plant cell and an animal cell.
Q7.What is DNA? Where is it found? Name the functional segment of DNA.
Q8. List two similarities between mitochondria and plastids.
Q9. Name the organelle that is referred to as the 'powerhouse of the cell'.Why is it called so?
Q10. Mention any two functions of the endoplasmic reticulum.
Q11. Give the functions of the following organelles in a cell.
a)Chloroplast b) Leucoplast c)Chromoplast
Q12. What is endocytosis? Name an organism that feeds by this method.
Q13. State cell theory. Name the scientists who presented it.
Q14. Tick the correct box in the given table-
STATEMENT
Isotonic Solution
Hypotonic Solution
Hypertonic Solution
1. The concentration of the solute in the solution is lower than the concentration inside the cell.
2. When a cell is placed in this solution, water will enter the cell by osmosis causing it to swell.
3. The concentration of the solute in the solution is the same as the concentration inside the cell.
4. The concentration of the solute in the solution is higher than the concentration inside the cell.
5. When this solution is injected into the body no cell disruption occurs because no net osmosis occurs.
6. Putting a plant in this solution will result in water loss and cause the plant to wilt.
7. The cell will shrivel when placed in this type of solution.
8. When a cell is placed in this type of solution, there will be equal amounts of water moving in and out of the cell at equal rates.
Q15. Draw a well labeled diagram of plant and animal cell.

Answer 1

Q1. Describe the structure and functions of nucleus.

The nucleus is a spherical-shaped organelle present in every eukaryotic cell. It is the control center of eukaryotic cells, responsible for the coordination of genes and gene expression. The structure of a nucleus encompasses nuclear membrane, nucleoplasm, chromosomes and nucleolus.

Answer 2

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