1. What is the difference between a star and a planet?

a) A star is a luminous sphere of plasma, while a planet is

a solid or gaseous body that orbits a star.

b) A star is a massive object that produces its own light,

while a planet is a smaller object that reflects light from a

star.

c) A star is a hot ball of gas that undergoes nuclear fusion,

while a planet is a cold ball of rock or ice that does not.

d) All of the above are correct. *

Rationale: A star is different from a planet in terms of its

size, luminosity, composition and energy source.

2. What is the main reason why seasons occur on Earth?

a) The distance between Earth and the Sun changes

throughout the year.

b) The tilt of Earth's axis causes different parts of Earth to

receive more or less sunlight throughout the year. *

c) The rotation of Earth around its axis causes day and

night cycles that affect the temperature.

d) The gravitational pull of the Moon and other planets

causes changes in Earth's climate.

Rationale: Seasons are caused by the tilt of Earth's axis,

which makes the angle of sunlight vary depending on the

location and time of year. The distance between Earth and

the Sun has a negligible effect on seasons.