"Our Home: Earth, a Unique Life Sustaining Planet" — Practice

Question 1

Why is Venus the hottest planet in the solar system, even though Mercury is closer to the Sun?

Accepted Answer

Venus's thick carbon dioxide atmosphere traps heat via the greenhouse effect

Question 2

What is the habitable zone (or Goldilocks zone)?

Accepted Answer

The range of distances from a star over which water remains liquid

Question 3

What is the chapter's own term for the solid parts of the Earth, including rocks, soils and minerals?

Accepted Answer

Geosphere

Question 4

In sexual reproduction, why doesn't an offspring's genetic material double compared to a single parent's?

Accepted Answer

Each parent's gamete carries only half of that parent's genetic material

Question 5

Which of the following correctly matches an animal group to its fertilisation and embryo development strategy, as described in the chapter?

Accepted Answer

Fish — external fertilisation, embryo develops in water

Question 6

Explain why Earth's magnetic field is essential for protecting life, tracing the full chain from its source to what it ultimately shields.

Accepted Answer

The field, likely from molten iron movement in Earth's core, deflects cosmic rays and solar wind, which would otherwise damage the atmosphere and reduce the ozone layer, letting in more harmful UV.

Question 7

A student says a garden greenhouse and the greenhouse effect on Venus work by exactly the same mechanism. Correct this using the chapter's own 'A step further' explanation.

Accepted Answer

They keep things warm through different mechanisms — gas absorbing radiation (planetary) versus a sealed glass space trapping already-warmed air (garden greenhouse).

Practice — "Our Home: Earth, a Unique Life Sustaining Planet"

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