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1<br/><br/><br/><br/><br/><br/><br/><br/>a)     Name cell A and pathway

B and C.                                                                   


b)     Transpiration occurring at the leaves is mainly responsible for movement of water across the root of R . acris. Explain how transpiration is responsible for the movement of water across the root as shown in the figure.                                                 


c)     Ions are taken up by root hair cells using active transport and facilitated diffusion. Describe two ways in which facilitated diffusion differs from active transport.

c.png
Water absorbed by plant roots travels by different pathways from root hairs to the xylem.
Fig. 6.1 shows these pathways in the root of Ranunculus acris.
cell A
xylem vessel
root hair
key
pathway B
---+ pathway C
d.png
(b) Adult volunteers took part in an investigation to find out the effect of dietary
changes on their risk of developing coronary heart disease.
In this investigation, 5% of the volunteers' energy intake was changed from one
food source to another. The volunteers' total energy intake remained constant.
The graph below shows the results of this investigation.
Saturated lipids changed
to carbohydrates
Saturated lipids changed
to unsaturated lipids
0
20
40
60
80
Percentage decrease in risk of
developing coronary heart disease (%)
(1) Suggest why it was necessary to ensure that their total energy intake
remained constant.
(2)
di.png
(i) Name the organelle labelled X on the diagram.
(1)
(ii)
the correct name of the organelle labelled Y
on the diagram.
(1)
A Golgi apparatus
B mitochondrion
C rough endoplasmic reticulum
D smooth endoplasmic reticulum
(iii) The organelles labelled X, Y and Z on the diagram are involved in the synthesis
and secretion of digestive enzymes.
Describe the roles of these organelles in the synthesis and secretion of
digestive enzymes.
do.png
7 , Fungi have structures called hyphae mat secrete enzymes used for the extracellular digestion of food. The diagram below shows a growing tip oi one fungal hypha containing vesicles. labelled I. These 1«vesicles contain digestive enzymes.
m.png
(ii) Using the information in the graph and your own knowledge, suggest an
explanation for the results of this investigation.
(3)

Step-by-step answer

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