‘Manufacturing synthetic fibres is actually helping conservation of forests’. Comment.
Manufacturing synthetic fibres is actually helping conservation of forests because for natural fibres, raw materials is obtained from the plants. For this a number of trees are cut down. But for synthetic fibres, raw material is obtained from the petrochemicals. So we can say that synthetic fibres helps in the conservation of forests.
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.
Mark (✓) the correct answer:
Rayon is different from synthetic fibres because
(a) it has a silk like appearance
(b) it is obtained from wood pulp
(c) its fibres can also be woven like those of natural fibres
Why does the increased level of nutrients in the water affect the survival of aquatic organisms?
Does pure water conduct electricity? If not, what can we do to make it conducting?
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?
Explain why chloroplasts are found only in plant cells?
Angle of incidence is equal to the angle of reflection
(a) Always (b) Sometimes
(c) Under special conditions (d) Never
Sketch larynx and explain its function in your own words.
Give two difference between a zygote and a foetus.
Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
In which part of the sky can you find Venus if it is visible as an evening star?