Match the organisms in Column I with their action in Column II.
Column I Column II
(i) Bacteria (a) Fixing Nitrogen
(ii) Rhizobium (b) Setting of curd
(iii) Lactobacillus (c) Baking of bread
(iv) Yeast (d) Causing Malaria
(v) A protozoan (e) Causing Cholera
(vi) A Virus (f) Causing AIDS
(g) Producing antibodies
Column I Column II
(i) Bacteria (e) Causing Cholera
(ii) Rhizobium (a) Fixing Nitrogen
(iii) Lactobacillus (b) Setting of curd
(iv) Yeast (c) Baking of bread
(v) A protozoan (d) Causing Malaria
(vi) A Virus (f) Causing AIDS
- Cholera is a water born disease which is spread by drinking impure water.
- In soil, some bacteria are present like Rhizobium which fixes the nitrogen and increases the fertility of the soil.
- Setting of curd is occur due to the presence of Lacto bacillus bacteria. It converts milk into curd.
- Baking of bread is occurs in the presence of yeast. Growth of yeast cell increases the size of the dough.
- Malaria is caused by a protozoan. The carrier of malaria caused protozoan is female Anopheles mosquito.
- AIDS is caused by a virus. This disease is caused by the sexual intercourse.
Popular Questions of Class 8 Science
- Q:-
Describe with the help of a diagram an instrument which can be used to detect a charged body.
- Q:-
Sketch larynx and explain its function in your own words.
- Q:-
Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
- Q:-
Make a labelled diagram of a candle flame.
- Q:-
What is metamorphosis? Give examples.
- Q:-
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.
- Q:-
Make sketches of animal and plant cells. State three differences between them.
- Q:-
What is a constellation? Name any two constellations.
- Q:-
Describe the construction of a kaleidoscope.
- Q:-
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.
Recently Viewed Questions of Class 8 Science
- Q:-
The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accomodate?
- Q:-
Explain how fertilisers are different from manure.
- Q:-
Explain why objects moving in fluids must have special shapes.
- Q:-
It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
- Q:-
Define adolescence.
- Q:-
Fill in the blanks:
(a) Microorganisms can be seen with the help of a ____________.
(b) Blue green algae fix __________ directly from air to enhance fertility of soil.
(c) Alcohol is produced with the help of __________.
(d) Cholera is caused by __________. - Q:-
In the following statements, tick T against those which are true, and F against those which are false:
(a) Sound cannot travel in vacuum. (T/F)
(b) The number of oscillations per second of a vibrating object is called its time period. (T/F)
(c) If the amplitude of vibration is large, sound is feeble. (T/F)
(d) For human ears, the audible range is 20 Hz to 20,000 Hz. (T/F)
(e) The lower the frequency of vibration, the higher is the pitch. (T/F)
(f) Unwanted or unpleasant sound is termed as music. (T/F)
(g) Noise pollution may cause partial hearing impairment. (T/F) - Q:-
Make a sketch of the human nerve cell. What function do nerve cells perform?
- Q:-
Find out the information about the national parks in your state. Identify and show their location on the outline map of India.
- Q:-
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
- NCERT Chapter