Natural Resources - Free MCQ Practice Test with solutions, CTET Science

Wooden door, windows and chair are made of timber obtained from forest while polythene is manmade product.

Well is underground source of water while river, lake and sea are surface source of water.

The major part of air (which does not support burning candle) is nitrogen.

Air is a mixture of a number of gases like Nitrogen, Oxygen and Carbon dioxide etc.

The purest form of water is rain water as no impurities is present in it.But when it comes to earth, the gases present in the atmosphere gets mixed with it and hence makes it impure but rainwater is pure when it fells from clouds.

Water has dissolved air. When the water is heated, the air within it begins to escape, resulting in the formation of bubbles.

The blowing wind makes the windmill to rotate.

• The energy in which wind is used to generate electricity is known as wind energy.
• Wind turbines convert the kinetic energy in the wind into mechanical power.
• This mechanical power is then used for various purposes.
• Wind energy is a free and renewable resource. It is a clean and non-polluting source of energy.

Microorganisms act upon the dead plants to produce humus the increase the fertility of soil.

Water is the only substance, which is found in all three states in nature.

Kerosene is derived from petroleum and is a combustible hydro-carbon in liquid state. It is not derived from forests and so is not a forest product.

Forest products are materials that are derived from forests and forestry either for direct consumption or for commercial use. Gum, plywood and sealing wax are all obtained from forests for different purposes and so are categorized as forest products.

The gaseous state of water is vapour form by evaporation or boiling the water.

mushrooms and other micro-organisms feed on dead plant and animal tissues, playing a significant role in decomposing organic matter and recycling nutrients in the ecosystem. They do not feed on living animals, sunlight, or use water as a primary nutrient source. 

The burning of fossil fuels - like coal, oil and natural gas - releases gases into the air, mainly carbon-dioxide, sulfur dioxide, methane and nitrous oxide.

By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.

The process of changing water into water vapour is called condensation.

Air is all around us, a thick layer of air surrounds the earth, this blanket of air is called atmosphere.

Rain is also known as precipitation.

Mountaineers carry Oxygen cylinder with them, while climbing mountains because air pressure is low at higher altitude.

The thick envelop of air around the earth is called atmosphere, which contain nitrogen and oxygen gas mainly.

 (d) all of these

• Furniture: Made from wood, which is a direct product of trees.
• Medicines: Many are derived from plant extracts and compounds.
• Petrol: Not obtained directly from plants. It is a fossil fuel formed from ancient organic matter, including both plants and animals, after millions of years under heat and pressure.
• Paper: Produced from wood pulp, directly sourced from trees.

Petrol is the correct answer, as it is not directly obtained from plants but through geological processes over time.

The correct answer is d) All of the above.

Explanation:

• Stopping dust storms: Trees and plants act as windbreakers, reducing the speed of the wind, which helps prevent dust storms.
• Preventing soil erosion: The roots of trees and plants hold the soil together, preventing it from being washed away by rain or blown away by wind.
• Balancing oxygen and carbon dioxide: Trees absorb carbon dioxide and release oxygen through photosynthesis, helping to maintain a balance in the atmosphere.

Thus, trees and plants provide all these important benefits to the environment.

Mountain appears green due to presence of plants on it in form of herb, shrub and tree.

Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves. Transpiration also cools plants, changes osmotic pressure of cells and enables mass flow of mineral nutrients and water from roots to shoots.
Therefore, the correct answer is option A.

Plants convert CO₂ into O₂ during photosynthesis. Exchange of gases takes place through stomata.

A weather cock shows the direction in which wind is blowing.

Water is a compound consisting of hydrogen and oxygen in fixed ratio.

Humus is found in the top layer of the soil.

Water is not blue in colour.

Water is colorless because all light (except tiny bit of blue) is reflected back. 

The process of eating and being eaten is called as food chain to transfer energy from one organism to other organism.