Olympiad Test: Our Environment - 2 - Class 6 MCQ

When kitchen waste is dumped in a pit, it undergoes decomposition due to the action of microorganisms. Over time, this organic waste breaks down and transforms into compost, a nutrient-rich soil amendment. Composting is a natural process that converts organic matter into a valuable fertilizer, enhancing soil fertility and structure.

Burning dried leaves and plant parts is detrimental for various reasons. It degrades the soil by reducing essential nutrients, produces harmful gases affecting air quality, prevents the opportunity to obtain valuable manure, and leads to unnecessary heat generation causing environmental issues.

Red bins are installed for waste like metal chips, screws and nuts. Green bins are installed for collecting biodegradable waste like egg shells and vegetable peels. Blue bins are installed for collecting the newspapers and journals, cardboard etc

To convert kitchen waste into nutrient-rich manure, the correct sequence involves first putting garbage in a pit, covering the bottom with sand, then loosely covering the pit, and finally adding worms. The worms aid in the breakdown of organic matter, facilitating the composting process.

River, ocean, pond and sea are surface water sources. Tube well and well are groundwater sources.

Air has mass which makes the balloon heavier and bends the scale to the side on which the inflated balloon is hung.

Spraying of pesticides on plants to kill pests may cause water pollution. The runoff from pesticide laden crop fields enters the nearby water bodies and causes water pollution.

The ozone layer is present in the stratosphere. Air is not an element. It is a mixture of gases that surrounds the Earth and makes it hospitable for living organisms.