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| A liquid X of colour Y circulates in the human body only in one direction : from body tissues to the heart. Among other things, liquid X contains germs from cells and dead cells. The liquid X is cleaned of germs and dead cells by a special type of white blood cells called Z. This cleaned liquid is then put into the blood circulatory system in subclavian veins. |
- What is (i) liquid X, and (ii) colour Y?
- What is Z?
- The liquid X is somewhat similar to a component of blood. Name this component.
- Why is liquid X not red?
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Name a circulatory fluid in the human body other than blood.
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How is lymph an important fluid involved in transportation? If lymphatic vessels get blocked, how would it affect the human body? Elaborate.
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What is the other name of 'tissue fluid'? Write its two functions.
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Define ‘redox reaction’. Give one example.
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What is an oxidising agent?
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Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
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Identify the substances that are oxidised and the substances that are reduced in the following reaction.
\[\ce{4Na(s) + O2(g) -> 2Na2O(s)}\]
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Which of the statements about the reaction below are incorrect?
\[\ce{2PbO(s) + C(s) → 2Pb(s) + CO2(g)}\]
- Lead is getting reduced.
- Carbon dioxide is getting oxidised.
- Carbon is getting oxidised.
- Lead oxide is getting reduced.
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Explain the following in term Oxidation of gain or loss of oxygen with two example.
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A shiny brown-coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black-colored compound formed.
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Describe the structure of nephrons.
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What are the methods used by plants to get rid of excretory products?
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How is the amount of urine produced regulated?
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The kidneys in human beings are a part of the system for ______.
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Draw the well-labelled diagram of the human excretory system
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Name the basic filtration unit present in the kidney.
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Name an animal which absorbs oxygen through its moist skin.
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What gaseous waste products are excreted by plants?
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