Cell structure and functions Sample paper

Q1. List two groups of prokaryotic organisms.

Solution

Bacteria and blue-green algae are two groups of prokaryotic organisms.

Q2. What is the importance of cell wall in plant cell?

Solution

The cell wall surrounding the cell membrane protects plant cells against variations in temperature, high wind speed, atmospheric moisture, etc.

Q3. What are chloroplasts? Locate them in the below figure. Why are they green in colour? What is their importance?

plant cells

Solution

Green coloured plastids are called chloroplasts. They are marked as ‘D’ in the given figure. They are green since they contain the green pigment called chlorophyll. Chloroplasts provide green colour to the leaves. Chlorophyll is essential for photosynthesis.

Q4. Name the following: a. Cell organelle responsible for protein synthesis b.Temporary finger-like projections formed in Amoeba which helps in its movement

Solution

a. Ribosome is responsible for protein synthesis. b. Amoeba moves from place to place by forming temporary finger-like projections called pseudopodia.

Q5. Differentiate between plant and animal cells.

Solution

 Plant cell Animal cell 1 Plant cells have an outer, rigid cell wall. Animal cells lack cell wall. 2 Plastids are present in plant cell. Plastids are absent in animal cell. 3 Large, central and permanent vacuole is present. Animal cells have small and many vacuoles which may be temporary. 4 Plant cell is generally larger than animal cell. Animal cell is smaller in size.

Q6. Write two functions of plasma membrane of animal cells.

Solution

(i) The plasma membrane forms the outer boundary of the cell and keeps the cell contents within it.(ii) It is porous and allows the movement of substances or materials both inward and outward.