Year 7 Science · Unit 1 · Lesson 4
Apply Worksheet
Learning Goals
True or false? Fix the false ones
Circle T or F. If a statement is false, correct it on the line.
1. Ferns have vascular tissue.
Correct it:
2. A gymnosperm makes its seeds inside a fruit.
Correct it:
3. About 90% of all plant species are angiosperms.
Correct it:
4. A seed holds an embryo plant and a store of food inside a tough coat.
Correct it:
5. A tree fern can grow 10 m tall, so it can live on a dry, exposed slope.
Correct it:
1. “Gymnosperm” means “naked seed”. Explain what the name tells you about a gymnosperm’s seeds.
Compare two seed plants
Complete the table for gymnosperms and angiosperms.
| Feature | Gymnosperms | Angiosperms |
|---|---|---|
| Where the seeds are made | ||
| How pollen usually reaches another plant | ||
| One Australian example |
Order the steps: a lilly pilly seed finds a new home
Number the events from 1 (first) to 5 (last).
| Step number | Event |
|---|---|
| The currawong flies off with the seed still inside its gut. | |
| A lilly pilly flower is pollinated and a seed forms inside a fleshy fruit. | |
| The seedling grows where it does not have to compete with its parent for light and water. | |
| A currawong eats the ripe fruit. | |
| The seed is dropped in the bird’s droppings, three valleys away. |
2. Pines rely on the wind to carry their pollen, and they tend to grow together in forests of pines. Explain why a flowering plant pollinated by birds can grow thinly scattered and still make seeds.
Read the data
Scenario: monocot or dicot?
A class digs up four flowering plants from the school garden and records their features in Table 1. Plant 4 had no flowers when it was collected, so the class split open one of its seeds instead.
| Plant | Leaf veins | Roots | Flower parts or seed | Monocot or dicot? |
|---|---|---|---|---|
| 1 | Net-like | One main root with side roots | 5 petals | |
| 2 | Parallel | Many thin roots | 3 petals | |
| 3 | Parallel | Many thin roots | 6 petals | |
| 4 | Net-like | One main root with side roots | No flowers; the seed has two seed leaves |
Source: made-up samples for this worksheet.
3. Complete the last column of Table 1.
4. Plant 3 has 6 petals, not 3. Explain why it still fits its group, and why the class checked three features for each plant instead of just one.
5. About 90% of plant species are angiosperms. Explain how flowers, fruit and seeds helped angiosperms spread into almost every land habitat, including the dry parts of Australia.
True or false
1. True. 2. False: gymnosperm seeds are made in cones. 3. True. 4. True. 5. False: a tree fern reproduces by spores, which need water, so it lives in damp gullies.
Question 1
Its seeds are not enclosed in a fruit; they sit in cones (1). [1 mark]
Compare two seed plants
Seeds: cones; inside fruit. Pollen: mostly wind (pines); often insects, birds or bats. Example: Wollemi pine or hoop pine; gum tree or wattle (accept any correct example). 1 mark per row. [3 marks]
Order the steps
Reading down the table as printed, the correct step numbers are 3, 1, 5, 2, 4.
In order: seed forms in fruit; currawong eats fruit; bird flies off; seed dropped far away; seedling grows free of competition.
Question 2
Wind scatters pollen, so wind-pollinated plants need their own kind growing thickly nearby (1). A bird carries pollen straight to the same species (1), even across open ground, so scattered plants still set seed (1). [3 marks]
Read the data
3. 1 dicot; 2 monocot; 3 monocot; 4 dicot. 2 marks for all four, 1 mark for three. [2 marks]
4. Monocot parts come in 3s, and 6 = 2 × 3 (1); its veins and roots agree (1). One feature can be missing or mislead; three that agree are stronger evidence (1). [3 marks]
Question 5
Marking guide: 1 flowers attract pollinators; 1 which deliver pollen more reliably than wind, so plants can grow scattered; 1 animals eat fruit and carry seeds away (currawong, lilly pilly); 1 seedlings escape competing with the parent; 1 a seed’s food store and coat let it wait for rain; 1 link to many habitats, including dry Australia. [6 marks]
Model answer: Flowers attract bees and birds that carry pollen straight to the same species, so scattered plants still set seed. Animals eat fruit and drop seeds far from the parent. A seed’s food store and tough coat let it wait out drought, so angiosperms can live almost anywhere, even in dry Australia.
Common error: saying flowers are there to look pretty; their job is reproduction.