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Classify the following elements into metals, non–metals and metalloids: C, Mg, Si, S, Hg, As.
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Given below are the end products of different reactions involving glucose. Write the appropriate end product in front of the following:
(1) Anaerobic reaction =
(2) Reaction in human muscles =
(3) Aerobic respiration
(4) Reaction in plant cells =
(5) Reaction in liver =
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Name the scientist who put forward the most popular model of DNA.
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Write any three differences between metals and non-metals with respect to their physical properties.
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Draw a diagram of DNA showing genes.
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Find the odd one out:
Amoeba, Euglena, Planaria, Paramoecium
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Why are metals used for making cooking vessels?
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Write a balanced chemical equation for the action of heat on aluminium hydroxide.
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Skin : Keratin : : Blood : ____________
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Rewrite the food-chain given below with correct sequence.
Grasshopper– Snake– Paddyfield– Eagle– Frog
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IT Act 2000 is to control the.......................
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Complete the following flowchart.
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In which of the following industries, microbial enzymes are not used?
a) Glass industry.
b) Cheese industry
c) Tanning industry.
d) Paper industry.
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Characters of a phylum are given below. Read those carefully and answer the questions.
a. Spines of calcium carbonate are present on the body.
b. These animals are exclusively marine.
c. They perform the locomotion with the help of tube feet.
d. Their skeleton is made up of calcareous plates or spicules.
i. Animals of which phylum show the above characters?
ii. Give an example from that phylum.
iii. These animals can be classified with the help of which criteria of new system of animals classification?
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Track the changes in methods of animal classification. How the methods of animal classification changed over the time?
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Explain the mechanism of hereditary changes.
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i. Which mental illness is shown in the picture given below?
ii. Which social message would you like to give through it?
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Fill in the blank and explain the statement.
Our muscle cells perform ______ type of respiration during exercise.
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