WS 9

Sapling is eaten by?

(Deer/wolf/lions)

Deer

Deer is eaten by?

(Sapling/wolf/lion)

Wolf

Wolf is eaten by?

(Sapling/deer/lion)

Lion

Scientist found that the deer population in that place has decreased sharply. Suggest one reason for it.

Humans hunt deers for antlers.

If the population continues to decrease sharply, how will the sapling population change?

The sapling population will increase.

Apart from providing the food (nutrient cycle), how are plants and animals connected in the ecosystems?

Animals breathe out carbon dioxide which is taken by plants for photosynthesis. During photosynthesis, plants produce oxygen which is breathed in by animals.

Leanne often shops from overseas shops.

❌

Bob eats shark-fin soup once a month.

❌

Jane prefers eating vegetables than meat.

✅

Kevin uses appliances with Grade 1 energy labels.

✅

Nora drives her car to work every day.

❌

Which of the following types of renewable energy is/are produced in Hong Kong? List all the correct answer(s).

(Solar energy / Wind energy / hydro energy / geothermal energy) is/are produced in Hong Kong.

Solar energy, wind energy and hydro energy are produced in Hong Kong.

Coal

Renewable/non-renewable

Limitations

Non-renewable energy

• takes hundreds of millions of years to form so it may run out

• Burning it can produce a lot of greenhouse gases

Sunlight

Renewable/non-renewable

Limitations

renewable energy

• High setup cost

• Only available on sunny days and making it unreliable

• Relies on environment and whether conditions

• Solar panel takes up space

Wind

Renewable/non-renewable

Limitations

Renewable energy

• Relies on environment and weather conditions making it unreliable

• Maintenance cost is high

• Takes up a lot of space

• Wind turbines are usually far from cities, therefore require more energy and higher cost to transport the energy to cities