You have learnt that a tail is present in a tadpole but it
disappears as it grows into a frog. What is the advantage of
having a tail in the tadpole stage?
You have learnt that different conditions are required for
seed germination. How can we use this knowledge for
proper storage of grains and pulses?
List the similarities and differences in life cycles of plants
and animals.
Read the following story titled ‘Intelligent Leela’ and tick the
most appropriate options. Provide a suitable title of your
choice for the paragraph.
A mixture containing potatoes, salt and sawdust has been
given to you. Outline a stepwise procedure for separating
each component from this mixture.
During the COVID-19 pandemic, all of us wore masks.
Generally, what material are they made of? What is the role
of these masks?
Can you relate the presence of nasal hair to any separation
process?
In what situations would you use decantation instead of
filtration to separate solids from liquids?
State with reason(s) whether the following statements are
True [T] or False [F]. Also, correct the False statement(s).
(i) Salt can be separated from salt solution by
keeping it under the Sun. [ ]
(ii) Handpicking should be used only when the
quantity of one component is less. [ ]
(iii) A mixture of puffed rice and rice grains can be
separated by threshing. [ ]
(iv) A mixture of mustard oil and lemon water can
be separated by decantation. [ ]
(v) Sieving is used to separate a mixture of
rice flour and water. [ ]
State with reason(s) whether the following statements are
True [T] or False [F]. Also, correct the False statement(s).
(i) Salt can be separated from salt solution by
keeping it under the Sun. [ ]
(ii) Handpicking should be used only when the
quantity of one component is less. [ ]
(iii) A mixture of puffed rice and rice grains can be
separated by threshing. [ ]
(iv) A mixture of mustard oil and lemon water can
be separated by decantation. [ ]
(v) Sieving is used to separate a mixture of
rice flour and water. [ ]
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