Make sketches of animal and plant cells. State three differences between them.
The difference between plant cell and animal cell are as follows:
Plant cell | Animal cell |
These cells are large in size. | Cells are small in size. |
Cell wall is present. | Cell wall is absent. |
Vacuoles are larger in size. | Vacuoles are small in size. |
Plastids are present. | Plastids are absent except Euglena. |
Plasma membrane is present. | Plasma membrane is absent. |
Mitochondria are present in small number. | Mitochondria are present and are numerous. |
Describe with the help of a diagram an instrument which can be used to detect a charged body.
Sketch larynx and explain its function in your own words.
Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
Make a labelled diagram of a candle flame.
What is metamorphosis? Give examples.
The following Table shows the total power shortage in India from 1991– 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.
What is a constellation? Name any two constellations.
Describe the construction of a kaleidoscope.
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 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.
Make a sketch of the human nerve cell. What function do nerve cells perform?
Explain how CO2 is able to control fires.
Explain how you can take care of your eyes.
What is the difference between noise and music? Can music become noise sometimes?
Make a sketch of the human nerve cell. What function do nerve cells perform?
Why does the increased level of nutrients in the water affect the survival of aquatic organisms?
Which of the following cannot be charged easily by friction?
(a) A plastic scale
(b) A copper rod
(c) An inflated balloon
(d) A woollen cloth.
A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.
Where are chromosomes found in a cell? State their function.
Complete the cross-word puzzle using the hints given below
Across
1. The process of the fusion of the gametes.
6. The type of fertilization in hen.
7. The term used for bulges observed on the sides of the body of Hydra.
8. Eggs are produced here.
Down
2. Sperms are produced in these male reproductive organs.
3. Another term for the fertilized egg.
4. These animals lay eggs.
5. A type of fission in amoeba.
What is metamorphosis? Give examples.