Question
Write the difference between plant cell and animal cell.
✓
Answer
| Plant cell | Animal cell |
| Cell wall is present and is made of cellulose. | They lack cell wall. |
| Usually lack lysosomes and peroxisomes. | Lysosomes and peroximes are present. |
| They have one large central vacuole. | Many small vacuoles are found. |
| Chloroplast is present which helps plant in photosynthesis. | Chloroplast is absent. |
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Fill in the blanks using the words given in the box.
$a.$ A chemical process in which a substance reacts with oxygen to give off heat is called $............$
$b.$ Wood, paper, $\text{CNG}$ are $............$ substances.
$c.$ The lowest temperature at which a substance catches fire is called its $............$ temperature.
$d.$ Ignition temperature of $............$ is lower than that of wood.
$e.$ The substances which have very low $............$ temperature and can easily catch fire with a flame are called $............$ substances.
$f.$ The amount of heat energy produced on complete combustion of $1\ kg$ of a fuel is called its $............$
→$a.$ A chemical process in which a substance reacts with oxygen to give off heat is called $............$
$b.$ Wood, paper, $\text{CNG}$ are $............$ substances.
$c.$ The lowest temperature at which a substance catches fire is called its $............$ temperature.
$d.$ Ignition temperature of $............$ is lower than that of wood.
$e.$ The substances which have very low $............$ temperature and can easily catch fire with a flame are called $............$ substances.
$f.$ The amount of heat energy produced on complete combustion of $1\ kg$ of a fuel is called its $............$
Explain the process to decompose water into hydrogen and oxygen.
What is meant by water pollution? What are the different ways in which water gets polluted?
A woman is in her reproductive phase of life. Even when the sperms are available at the time of release of a mature ovum by her ovary, fertilization does not take place. Due to this, the woman is unable to bear a baby.
$a.$ What is the most likely defect in the reproductive system of this woman?
$b.$ Name the technique by which this woman can also have a baby?
→$a.$ What is the most likely defect in the reproductive system of this woman?
$b.$ Name the technique by which this woman can also have a baby?
Fill the blank circles in figure and identify the sex of child $A$ and $B.$
→The species $P$ and $Q$ of wild animals are found only in a ‘particular area’. The species $R$ of wild animals is listed in $R$ed data book of India whereas species $S$ of wild animals no longer exists anywhere on the earth.
$A.$ What name is given to species like $P$ and $Q$?
$B.$ What are the species like $R$ known as?
$C.$ Name one species like $R$?
$D.$ What is the special name of species like $S$?
$E.$ Name one species like $S$?
→$A.$ What name is given to species like $P$ and $Q$?
$B.$ What are the species like $R$ known as?
$C.$ Name one species like $R$?
$D.$ What is the special name of species like $S$?
$E.$ Name one species like $S$?
Match the names of scientists given in Column $A$ with the discovery made by them given in Column $B.$
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Column $A$
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Column $B$
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$(a)$
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Louis Pasteur
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$(i)$
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Penicillin
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$(b)$
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Robert Koch
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$(ii)$
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Anthrax bacterium
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$(c)$
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Edward Jenner
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$(iii)$
|
Fermentation
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$(d)$
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Alexander Fleming
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$(iv)$
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Small pox vaccine
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$(v)$
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Typhoid
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What is meant by ‘nitrogen fixation’? State two ways in which nitrogen gas of the atmosphere can be ‘fixed’ in nature to get nitrogen compounds in the soil.
Draw a labeled diagram to show the fertilization of a human egg by a sperm to form a zygote.
With the help of a labelled diagram, describe briefly how an iron key can be electroplated with copper.