Seeds and Bulbs

In this worksheet, students observe and describe how seeds and bulbs grow into mature plants.

Key stage:  KS 1

Curriculum topic:   Plants

Curriculum subtopic:   Seeds, Bulbs and Maturing Plants

Difficulty level:

QUESTION 1 of 10

All over the world farmers and gardeners grow a wide range of plants from seeds and bulbs. Some of these plants will provide food and wealth to families, other plants will look attractive in the garden and give pleasure to visitors.

Class 2 at Wood Street Primary are investigating how plants develop from seeds.

They sprinkle cress seeds over plastic cups filled with compost, then they water the seeds. Bill and Martha are members of class 2. They measure the length of their cress plants every Monday, Wednesday and Friday for four school weeks. They also write down any important observations.

Bill and Martha record their results in a table. They started their investigation on Monday of Week 1.

Week Day Length of Shoot (cm) Observations
1 Wednesday 0 Seed starts to swell
1 Friday 0 Seeds crack
2 Monday 0.3 Shoots start to grow
2 Wednesday 0.9
2 Friday 1.3 Leaf developing
3 Monday 2.5 Shoots much taller
3 Wednesday 3
3 Friday 3.3
4 Monday 3.8 Shoots lean towards the window
4 Wednesday 4.2
4 Friday 4.6 Last day. Cress sandwiches for lunch!

You will need to use this table to answer the next questions. Remember, you can always use HELP to see the table again.

Bill and Martha think they should water the cress seeds regularly.

How often should Bill and Martha water the cress?

Every day

Every Monday

On which day did the the first shoots appear?

Friday (week 1)

Monday (week 2)

Between which days did the shoots grow most?

Monday (week 2) to Wednesday (week 2)

Wednesday (week 2) to Friday (week 2)

Friday (week 2) to Monday (week 3)

Bill writes down the following conclusion.

"Between Friday of week 2 and the last day our cress shoots grew by _______ cm."

How many cm did the cress seeds grow by?

Lilly and Harry carried out a similar experiment to Bill and Martha.

However, Lilly and Harry did not water their plants as often as Bill and Martha.

How would their results be different?

Their shoots will be bigger.

Their shoots will be smaller.

The teacher tells Bill and Martha about a gardener who plants some bulbs into different pots.

The gardener puts one pot in his greenhouse, he puts the other into a darkroom. He gives both pots exactly the same volume of water at the same time each day.

 in greenhouse in darkroom

The bulbs grew small shoots in both pots.

The teacher asks Bill and Martha to explain what the most scientific reason for this is.

Bulbs do not need light to grow.

Bulbs need light and water to grow.

Bulbs do not need light to grow because they have their own food store, they just need water.

The teacher asks Bill and Martha to think about their observation from Monday from week 4. That day Bill and Martha wrote:

Shoots lean towards the window

Why did their shoots lean towards the window?

They were stretching to reach the rain outside.

They need light to continue their growth.

The teacher tells the class that some gardeners take bulbs out of the soil in autumn and keep them in a small box or paper bag until the following spring. The box is stored somewhere dry.

Why don't the bulbs develop shoots when they are being stored in the box or paper bag?

It is too cold.

Bulbs need healthy soil and lots of water to grow.

• Question 1

Bill and Martha think they should water the cress seeds regularly.

How often should Bill and Martha water the cress?

Every day
EDDIE SAYS
Growing plants need plenty of water. They should be watered regularly every day.
• Question 2

On which day did the the first shoots appear?

Monday (week 2)
EDDIE SAYS
Bill and Martha recorded in the table that "shoots start to grow" on Monday of week 2.
• Question 3

Between which days did the shoots grow most?

Friday (week 2) to Monday (week 3)
EDDIE SAYS
Between Friday of week 2 and Monday of week 3 the cress shoots grew by 1.2 cm.
• Question 4

Bill writes down the following conclusion.

"Between Friday of week 2 and the last day our cress shoots grew by _______ cm."

How many cm did the cress seeds grow by?

3.3
EDDIE SAYS
The cress grew by 3.3 cm. You can easily work this out by subtracting 1.3, which is the measurement Bill and Martha made on the Friday of week 2, from 4.6 which is the final measurement that Bill and Martha made. 4.6 - 1.3 = 3.3 cm
• Question 5

Lilly and Harry carried out a similar experiment to Bill and Martha.

However, Lilly and Harry did not water their plants as often as Bill and Martha.

How would their results be different?

Their shoots will be smaller.
EDDIE SAYS
Plants that are not watered regularly will not grow as much as plants that are.
• Question 6

The teacher tells Bill and Martha about a gardener who plants some bulbs into different pots.

The gardener puts one pot in his greenhouse, he puts the other into a darkroom. He gives both pots exactly the same volume of water at the same time each day.

 in greenhouse in darkroom

The bulbs grew small shoots in both pots.

The teacher asks Bill and Martha to explain what the most scientific reason for this is.

Bulbs do not need light to grow because they have their own food store, they just need water.
EDDIE SAYS
Bulbs contain a rich food source for the growing plant, and as long as you water them regularly they will develop shoots.
Of course, as soon as the shoots develop the plant should be given plenty of light, otherwise it will not continue to grow.
• Question 7

The teacher asks Bill and Martha to think about their observation from Monday from week 4. That day Bill and Martha wrote:

Shoots lean towards the window

Why did their shoots lean towards the window?

They need light to continue their growth.
EDDIE SAYS
Even though seeds don't need light to start their growth, the leaves need light to make new food for the plant so they can continue to grow. That is why Bill and Martha's shoots lean towards the light from the window.
• Question 8

The teacher tells the class that some gardeners take bulbs out of the soil in autumn and keep them in a small box or paper bag until the following spring. The box is stored somewhere dry.

Why don't the bulbs develop shoots when they are being stored in the box or paper bag?

Bulbs need healthy soil and lots of water to grow.
EDDIE SAYS
This little trick saves gardeners lots of money because they don't have to replace bulbs that have died off during the winter.
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