Question
Leaves are made of tissues.
(a) Define the term tissue.
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Figure shows a photograph of a transverse section of a leaf, showing the upper and lower surfaces
(b) Name:
(i) tissue A
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(ii) the process by which gases travel through the stomata.
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(c) Describe how root hair cells differ from the cells labelled B in Fig. 4.1.
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(d) Outline how water that has entered a root hair cell reaches the stomata.
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(e) Leaf hairs, shown in Fig. 4.1, help to increase the humidity near the leaf surface.
(i) Compare the leaf hairs on the upper leaf surface with the leaf hairs on the lower leaf
surface.
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(ii) Explain the importance of increasing humidity near the leaf surface.
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Answer/Explanation
Ans:
Question
Figure shows a diagram of a cell found in leaves.
(a) (i) State the names of structures F, G and H.
Write your answers on Fig. 5.1.
(ii) On Fig. 5.1 draw:
a line labelled K to show where the chromosomes are found
a line labelled L to show the position of the cell membrane.
(iii) State the name of this type of plant cell.
(b) The cell in Fig. 5.1 was placed in a concentrated glucose solution.
Fig. 5.2 shows the appearance of the cell after ten minutes in the glucose solution.
(i) State two ways in which the cell has changed.
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2 ………………………………………………………………………………………………………………………. [2]
(ii) Water moves into and out of the cell by osmosis.
Osmosis is a form of diffusion.
Describe the ways in which diffusion is different to active transport.
Answer/Explanation
Ans
(a)(i) (F) cytoplasm ;
(G) chloroplast ;
(H) (sap / central) vacuole ;
(a)(ii) K line ending on the nucleus ;
L line ending exactly on inner line of cell wall ;
(a)(iii) palisade (mesophyll) cell ; 1
(b)(i) cell / it, has shrunk or is smaller / AW ;
cell walls are indented / AW ;
vacuole / AW is smaller ;
gap developed (between wall and membrane) ;
(b)(ii) 