HOTs for Science Olympiad -2 - Free MCQ Test with solutions Class 4 Olympiad

Planting trees helps in reducing air pollution as trees absorb carbon dioxide and release oxygen during photosynthesis, thus improving air quality.

Deforestation results in the loss of trees and natural habitats for various animal species, leading to a decline in biodiversity and affecting the overall ecosystem.

Conserving water and electricity reduces the strain on natural resources and helps in protecting the environment for future generations. It also reduces the carbon footprint and promotes sustainable living practices.

Improper disposal of plastic waste can lead to environmental pollution, harm wildlife, and contribute to various ecological problems. Therefore, it's important to properly dispose of plastic waste to prevent environmental damage.

Collecting water samples for analysis helps in understanding the extent and source of pollution. Reporting the findings to their teacher can lead to appropriate action being taken to address the pollution issue.

Planets, including Earth, revolve around the sun in fixed paths called orbits. This phenomenon is known as revolution. The sun is the center of our solar system, and planets revolve around it due to the gravitational force exerted by the sun.

Earth is the only planet in the solar system known to have liquid water on its surface. This unique feature allows Earth to support life as we know it.

The challenge you wouldn’t face on Jupiter is the: Shorter day-night cycle

A shorter day (about 10 hours) doesn’t make a big difference for survival. But the strong gravity, no oxygen, and extreme weather are all big challenges that astronauts would have to deal with on Jupiter.

The duration of a day on a planet is determined by its rotation speed. If a planet rotates slower than Earth, its day will be longer. Therefore, the rotation speed of the planet is the most likely explanation for the longer day observed by the astronaut.

The change in seasons on Earth is primarily caused by the tilt of the Earth's axis as it orbits the sun. This tilt causes different parts of the Earth to receive varying amounts of sunlight throughout the year, leading to the seasons.