Describe the process of fertilization in human beings.
Fusion of male and female gamete is called fertilization. Both male and female gametes are released by the reproductive organs of male and female body respectively. Sperm is released from the male reproductive organ, i.e. penis. These released sperms enter into the female body through vagina. Then through the vagina, sperms reaches to egg through the fallopian tube. The process of fertilization take place in the fallopian tube.
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.
Make sketches of animal and plant cells. State three differences between them.
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.
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
How is an embryo developed?
Clear, transparent water is always fit for drinking. Comment.
If wheat is sown in the kharif season, what would happen? Discuss.
Do all the stars in the sky move? Explain.
Prepare a brief speech on global warming that you have to make in your class.
(a) Find out the position of the image of an object situated at A in the plane mirror (Fig. 16.21).
(b) Can Paheli at B see this image?
(c) Can Boojho at C see this image?
(d) When Paheli moves from B to C, where does the image of A move?
Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
State the difference between eukaryotes and prokaryotes.
Name the petroleum product used for surfacing of roads.