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| There is a pair of bean-shaped organs P in the human body towards the back, just above the waist. A waste product Q formed by the decomposition of unused proteins in the liver is brought into organ P through blood by an artery R. The numerous tiny filters S present in organ P clean the dirty blood by removing the waste product Q. The clean blood goes into circulation through a vein T. The waste substance Q, other waste salts, and excess water form a yellowish liquid U which goes from organ P into a bag-like structure V through two tubes W. This liquid is then thrown out of the body through a tube X. |
- What is (i) organ P, and (ii) waste substance Q?
- Name (i) artery R, and (ii) vein T.
- What are tiny filters S known as?
- Name (i) liquid U (ii) structure V (iii) tubes W, and (iv) tube X.
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What do we call the degenerated or partially developed useless organs in living organisms? Enlist such organs in human body? How the same organs are useful in other animals?
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Read the following statement and justify the same in your own words with the help of a suitable example.
There is evidence of foetal science among chordates.
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Vestigial organ ______ present in human body is proof of evolution.
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Write a short note based on the information known to you.
Embryology
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Write a short note based on the information known to you.
Connecting link
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Write the names of those animals in whom some vestigial organs in human body are functioning.
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Explain with suitable examples importance of anatomical evidence in evolution.
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Observe the picture and answer the following questions.
A) Which evidence of evolution is shown in the picture?
B) What can be proven with this proof?
C) Give one more example of evidence of evolution
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Identify the process shown in the diagram and explain it in short
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Answer the following question.
a) What is meant by corrosion?
b) Write names of any two methods of prevention of corrosion.
c) In which method, metal like copper, aluminium are coated with a thin layer of their oxides by means of electrolysis.
d) Explain this method with diagram.
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Answer the following question.
Wisdom teeth : Vestigial organs :: Lungfish : ....................
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Find the odd man out:
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_______ is a connecting link between Annelida and Arthropoda.
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Complete the following chart:
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Choose the correct alternative and rewrite the following:
Iron is _____________________.
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What do you mean by vestigial structures? Name four vestigial organs found in man.
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Write three methods of preventing rusting of iron.
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List the organs of Human respiratory system.
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Rewrite the following statement by selecting the correct option.
During respiration, ____________ gas is given out.
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