Please select a subject first
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Write four adverse effects of radiations on human body.
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Write any four important facts which must be thought over while considering the scope of disaster.
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Name the following:
Main ore of aluminium.
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…………. is not essential for photosynthesis.
(a) Oxygen
(b) Carbon dioxide
(c) Light
(d) Chlorophyll
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In the extraction of aluminium: Name the process of concentration of bauxite.
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Considering the relationship in the first pair, complete the second pair:
Root : Vegetative propagation : : Flower : ____________
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The process of absorption of water into raisins occurs through its membranes. This process is known as ______________.
(a) Absorption
(b) Osmosis
(c) Adsorption
(d) Diffusion
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In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
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In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
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In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
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In the extraction of aluminium: Why is it necessary to replace anodes time to time?
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Which aspects will you check for pre-disaster management in your school?
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Answer the questions with the help of picture.
A) Which type of energy is produced?
B) This power plant is based on which energy source?
C) Is this power plant eco-friendly? How?
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Solve the following crossword puzzle.
- Maximum energy generation in India is done using ...... energy.
- ...... energy is a renewable source of energy.
- Solar energy can be called ...... energy.
- ...... energy of wind is used in wind mills.
- ....... energy of water in dams is used for generation of electricity.
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Observe the images ‘A’ & ‘B’ and answer the following questions.
i) Which disasters are shown in the images?
ii) Which primary precautions will you take in case of disaster shown in ‘A’?
iii) Which type of first-aid is offered to the injured peoples in disaster ‘B’?
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What is meant by green energy? Which energy sources can be called as green energy sources and why? Give examples.
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Write in brief about progressive changes in animal classification.
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What is the exact difference between grades of organization and symmetry? Explain with examples.
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Complete the following chart.
| Body cavity | Germ Layer | Phylum |
| Absent | .......... | Porifera |
| Absent | Triploblastic | .......... |
| Pseudocoelom | .......... | Aschelminthes |
| Present | .......... | Arthropoda |
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Answer the following question in your own words.
Why some of the organs in human body are most valuable?
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