Question 1 Hard
Which leaf layer has air spaces to let gases diffuse?
Show answer
Answer: spongy mesophyll
- The cells are loosely packed.
- It is the spongy mesophyll.
Plant tissues, organs and translocation: GCSE Combined Science Biology practice questions
A second set of questions on plant tissues, organs and translocation. They are different from the ones on the topic page. Try each, then open the answer and compare your working.
More questions
Question 2 Hard
A fruit uses sugar brought by the phloem. Is the fruit a source or a sink?
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Answer: sink
- It uses or stores the sugar.
- So it is a sink.
Question 3 Hard
Translocation needs energy. From which process does the energy come?
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Answer: respiration
- Cells release energy from glucose.
- It is respiration.
Question 4 Hard
Name the layer of wax on the upper surface of a leaf that reduces water loss.
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Answer: cuticle
- It is waxy and waterproof.
- It is the waxy cuticle.
Question 5 Easy
What do we call a group of similar cells that do the same job?
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Answer: tissue
- Cells working together on one job.
- This is a tissue.
Question 6 Easy
Which part of a plant takes in water and minerals from the soil?
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Answer: root
- It is underground.
- It is the root.
Question 7 Medium
Are the cells in xylem tubes dead or living?
Show answer
Answer: dead
- Xylem tubes are hollow.
- Hollow tubes are made of dead cells.
Question 8 Medium
Name the cells that sit next to phloem cells and provide them with energy.
Show answer
Answer: companion cells
- They are next to the phloem.
- They are companion cells.
Quick checks
Short questions with options. Choose one before you open the answer.
Check 1
What is a tissue?
Show answer
A group of similar cells that do the same job.
Check 2
What is the job of the palisade mesophyll?
Show answer
To carry out most of the photosynthesis.
Check 3
What is the job of the spongy mesophyll?
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Its air spaces allow gases to diffuse through the leaf.
Check 4
What are stomata?
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Small holes, mostly in the lower epidermis, that let gases in and out.
Check 5
What do guard cells do?
Show answer
They open and close a stoma.
Check 6
What does the waxy cuticle do?
Show answer
It reduces water loss from the leaf surface.
Check 7
What does xylem carry?
Show answer
Water and mineral ions from the roots to the leaves.
Check 8
What strengthens xylem tubes?
Show answer
Lignin.
Check 9
What does phloem carry?
Show answer
Dissolved sugars, mainly sucrose.
Check 10
What is translocation?
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The movement of dissolved sugars from the leaves to the rest of the plant.
Check 11
Does translocation need energy?
Show answer
Yes, from respiration.
Check 12
What is a source in a plant?
Show answer
A part that makes sugar, such as a leaf.
Check 13
What is a sink in a plant?
Show answer
A part that uses or stores sugar, such as a root or a fruit.
Check 14
What do companion cells do?
Show answer
They provide energy for phloem cells.
Check 15
Which direction does water move in xylem?
Show answer
Up the plant, from the roots to the leaves.
Check 16
Which directions can sugar move in phloem?
Show answer
Both up and down.
Check 17
What is an organ?
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A structure made of several tissues that work together.
Check 18
Name three plant organs.
Show answer
The leaf, the stem and the root.
Check 19
What does the upper epidermis do?
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It is a thin, transparent layer that protects the leaf and lets light through.
Check 20
Why are palisade cells packed tightly near the top of the leaf?
Show answer
So they catch lots of light.
Check 21
Why is a leaf thin?
Show answer
So gases only have a short way to diffuse.
Check 22
Why do phloem cells have small holes in their end walls?
Show answer
So the sugar solution can pass from cell to cell.
Keep going with Plant tissues, organs and translocation
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