What does a seed need to germinate, and how are the root, stem and leaves built for their jobs?
The conditions needed for germination, the process of germination including the radicle, plumule, root hairs and cotyledons, and the functions of the root, stem and leaves related to plant structure.
A focused CCEA GCSE Agriculture and Land Use answer on plant biology and germination, covering the conditions needed for germination, the process of germination with the radicle, plumule, root hairs and cotyledons, and the functions of the root, stem and leaves.
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What this dot point is asking
CCEA wants you to state the conditions a seed needs to germinate, describe germination using the correct named parts (radicle, plumule, root hairs and cotyledons), and give the functions of the root, stem and leaves, linking each to its structure.
Conditions needed for germination
You can test each condition by setting up seeds and changing only one factor at a time, keeping the others the same.
The process of germination
The stages, with the parts CCEA names:
- The seed takes in water and swells, and the seed coat splits.
- The radicle (the young root) grows downwards first, anchoring the seedling and absorbing water.
- Root hairs grow from the young root to increase the surface area for absorbing water and minerals.
- The plumule (the young shoot) grows upwards towards the light and develops the first leaves.
- The cotyledons (seed leaves) supply the stored food the seedling needs until its true leaves can photosynthesise.
Functions of root, stem and leaves
The grown plant has three main organs, each suited to its job:
- Root. Anchors the plant in the soil and absorbs water and minerals. Root hairs give a large surface area for absorption.
- Stem. Supports the plant, holds the leaves up to the light, and transports water, minerals and food between the roots and the leaves.
- Leaves. Make food by photosynthesis. They are broad and flat to capture light and contain most of the plant's chlorophyll.
Examples in context
Example 1. Sowing depth for a crop. A grower sows seeds at the correct depth so they have enough moisture and warmth but are not too deep for the plumule to reach the surface. If sown too deep, the seedling runs out of stored food from the cotyledons before it reaches the light and dies, so getting the conditions right at sowing protects the yield.
Example 2. Warming the seedbed. Because seeds need a suitable temperature, a grower may use cloches, a polytunnel or wait for the soil to warm in spring before sowing. A warmer seedbed speeds germination and gives an even, vigorous crop, whereas cold, wet soil leads to poor and patchy germination.
Try this
Q1. Name the three conditions needed for germination. [3 marks]
- Cue. Water, oxygen and a suitable (warm) temperature.
Q2. State the function of root hairs. [1 mark]
- Cue. They increase the surface area of the root for absorbing water and minerals.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA Unit 1 style3 marksState the three conditions a seed needs to germinate, and describe an experiment to show that one of them is needed.Show worked answer →
Two marks for the conditions and one for a valid experiment.
The three conditions needed for germination are water, oxygen and a suitable (warm) temperature.
To show water is needed: set up two boiling tubes of cress or bean seeds on cotton wool. Keep both at the same warm temperature with air present, but add water to one and leave the other dry. Only the seeds with water germinate, showing water is needed.
You could instead test temperature (one tube in a warm place, one in a fridge, both with water and air) or oxygen (one tube with air, one where the air has been removed, for example by boiling and covering the water with oil). Markers reward the three conditions plus a controlled experiment that changes only one variable.
CCEA Unit 1 style4 marksDescribe the process of germination, naming the radicle, plumule, root hairs and cotyledons.Show worked answer →
Four marks for an ordered description using the named parts.
When the seed takes in water it swells and the seed coat splits. The radicle (the young root) grows downwards first, anchoring the seedling and taking in water.
Root hairs grow from the young root to increase the surface area for absorbing water and minerals from the soil.
The plumule (the young shoot) then grows upwards towards the light and develops the first leaves.
The cotyledons (seed leaves) supply the stored food the seedling needs to grow until its true leaves can photosynthesise. In some seeds they are pulled above ground and turn green. Markers reward the correct order (radicle first, then plumule) and the role of each named part.
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