All topics › AQA GCSE Biology › Plant tissues2.3.1 Plant tissuesAQA GCSE Biology (8461), Higher tier · Organisation › Plant tissues, organs and systems
Practise Plant tissues. 14 exam-style questions plus unlimited generated ones on this subtopic, at up to four difficulty levels, with full mark schemes and a progress tracker. Free, no account needed.
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Light enters a leaf through its upper surface.lower epidermis palisade mesophyll spongy mesophyll upper epidermis upper epidermis → palisade mesophyll → spongy mesophyll → lower epidermis
Name the gas that diffuses into the leaf through the stomata for use in photosynthesis. carbon dioxide
A leaf is an organ. tissue Sample questions Written for this site in the style of AQA exam questions. They are not taken from real past papers.
Question 1 Easy 5 marks
{fig} shows a cross-section through part of a leaf.
[object Object]
(a) Name tissues B and C .[2]
(b) Give the function of cell D .[1]
(c) Layer A is covered by a waxy cuticle.[1]
(d) Which layer contains the most chloroplasts?one box.[1]
Show the answer and mark scheme (a) Answer: B palisade mesophyll; C spongy mesophyll
B – palisade mesophyll C – spongy mesophyll (b) to open and close the stoma / to control gas exchange and water loss (c) to reduce water loss (by evaporation) (d) Answer: B
Question 2 Medium 6 marks
A leaf contains several different plant tissues.
(a) Explain how the palisade mesophyll is adapted for photosynthesis.[2]
(b) Explain how the spongy mesophyll is adapted for gas exchange.[2]
(c) The upper epidermis is transparent.[1]
(d) Meristem tissue is found at the growing tips of shoots and roots.[1]
Show the answer and mark scheme (a) the cells contain many chloroplasts (to absorb light) the layer is near the upper surface of the leaf, so receives the most light (b) it has (many) air spaces so gases such as carbon dioxide can diffuse (quickly) to the photosynthesising cells (c) light can pass through to the palisade cells (for photosynthesis) (d) its cells divide (by mitosis) to make new cells that can differentiate / for growth Question 3 Hard 7 marks
The leaf is a plant organ. It contains several tissues that work together.
(a) Explain how the tissues of a leaf are adapted for photosynthesis and gas exchange.[6]
(b) Name the gas that diffuses into the leaf through the stomata for use in photosynthesis.[1]
Show the answer and mark scheme (a) waxy cuticle and upper epidermis are transparent, letting light through; the cuticle reduces water loss palisade mesophyll cells contain many chloroplasts to absorb light palisade cells are close to the upper surface and tightly packed, so they receive the most light spongy mesophyll has air spaces, so gases diffuse quickly between the stomata and the cells stomata in the lower epidermis let carbon dioxide diffuse in and oxygen / water vapour diffuse out guard cells open and close the stomata to control gas exchange and water loss xylem brings water (for photosynthesis); phloem carries dissolved sugars away the leaf is thin, giving a short diffusion distance, and has a large surface area Marked with levels of response: the full level descriptors are in the app.
(b) Answer: carbon dioxide
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