1. [2]Mention
the components of the transport system in highly organized plants. State the functions of these components.
2.
[3]
(a) What is a fuel ?
(b)Write
any two characteristics of a good fuel.
3.
[3]Name the hormone secreted by thyroid gland. Write its function. Why is it important for us to have iodised salt in our diet ?
4.
[3]
How does
feed-back mechanism regulate the hormone secretion ?
5.
[3] (i) What
do you understand by the
term hydrated salt ?
(ii) Give two
examples of hydrated salt
which are white
and state their
chemical formula.
6.
[3]Why the
medium becomes acidic in
mouth ? What is the
ill effect of the acidic medium ? How
this can be prevented ?
7.
[5]
(a) Draw a neat
diagram of Alimentary canal
and label the following
parts.
(i) the largest gland
(ii) the gland that secretes
digestive enzymes as well as hormones.
(iii) the part
where digested food is absorbed.
(b) What
are Villi ? Mention their functions.
(OR)
(a) Draw
the cross section of the leaf
and label the following parts.
(i) upper epidermis (ii) chloroplast
(b) Define
photosynthesis.
(c) List three
events which occur
during this process.
(d) Write
down the chemical equation
involved in photosynthesis.
(e) How
is unused energy stored in plants ?
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