10 Transpiration, transport and support in plants I
2nd Term WS 10
1
(a) (208–93)
/ 93 × 100% 1m
= 124% 1m
(b) This
can reduce transpiration. 1m
The stomata on the lower surfaces are sheltered from
air current / heat. 1m
(c) Increase the sample size for the shade
leaves.
/ Measure the thickness of cuticle.
/ Record the size of leaves. / Record the
size of stomata. / Record the number of stomata.
/ Measure the light intensity to classify
the types of leaves.
/ Repeat the experiment using other plants
of the same species. (any 2) 1m x 2
2
(a) transpiration 1m
xylem 1m
osmosis 1m
stomata 1m
(b) Photosynthesis
is essential for plants to gain energy.
/ Gas
exchange is needed for photosynthesis to occur.
/ Plants
need to open stomata to exchange gases.
/ Some
water is lost through the cuticle. (any 2) 1m
x 2
3
(a)
1m x 2
(b) Stoma
allows gases to pass in and out of the leaf. 1m
Cuticle reduces
water loss from the leaf surface. 1m
(c) (i) A floating plant 1m
(ii) The
leaf has stomata and cuticle on the upper epidermis. 1m
A leaf from a submerged plant has no
stomata and cuticle on both the upper and
lower epidermis. 1m
4.
(a) Bubble potometer 1m
(b) (25 – 1) / 30 1m
= 0.8 mm /min 1m
(c) It is used to reset the
position of the air bubble. 1m
(d) I: light intensity 1m
II: relative humidity 1m
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