Student Questions

The process where bacteria convert soil nitrogen into molecular nitrogen is called: A. Nitrogen fixation B. Nitrification C. Denitrification D. Ammonification

Which of the following is responsible for the destruction of the ozone layer? A. Carbon monoxide B. Carbon dioxide C. Chlorofluorocarbons (CFCs) D. Nitrogen dioxide

In a composite fish culture system, Catla fishes are typically: A. Surface feeders B. Middle-zone feeders C. Bottom feeders D. Feed on aquatic weeds

What does not come out of volcanoes?

How much time will take for it take for light to reach earth

I'm a muscle under the lungs I pull the lungs open to take in air.

Which of the following Roman Numeral expressions is incorrect? A. LX + IV = 64 B. XC - X = 80 C. CD + C = 500 D. XL + VI = 46

If a shop offers a "Buy 2 Get 1 Free" deal, what is the actual percentage discount you are getting on the total number of items? A) 50% B) 33.33% C) 25% D) 20%

A toy car originally cost ₹500. During a sale, the price was reduced by 10%, and then reduced by another 10% on the new price. What is the final price? A) ₹400 B) ₹405 C) ₹410 D) ₹450

Which is greater: 40% of 50 or 50% of 40? A) 40% of 50 B) 50% of 40 C) They are both equal D) Cannot be determined

If the ratio of milk to water in a mixture is 4:1, what percentage of the total mixture is water? A) 25% B) 10% C) 20% D) 40%

Acid rain is formed when certain gases from factories mix with water vapour in the air. Which of the following is a long-term "hidden" effect of acid rain on a forest? A) It washes away all the leaves so the trees look like it is winter. B) It changes the soil chemistry, dissolving vital nutrients that trees need to grow. C) It makes the forest floor too slippery for animals to walk on. D) It causes the trees to grow much faster than normal, making them weak.

Many cities are painted white or have "green roofs" (plants on top of buildings). How does this help specifically with "Thermal" or "Heat" pollution in a city? A) It makes the buildings look pretty so people forget the heat. B) It reflects sunlight and absorbs less heat, reducing the "Urban Heat Island" effect. C) It stops the wind from blowing through the city streets. D) It increases the amount of noise the buildings can absorb.

If a scientist finds high levels of a pesticide in an eagle’s egg, even though the pesticide was only sprayed on a farm 50 miles away, which process is occurring? A) Natural selection B) Photosynthesis C) Biomagnification D) Evaporation

A farmer notices that the pond at the edge of his field has turned bright green and the fish have died. What is the most likely sequence of events that caused this? A) Overfishing caused the algae to grow because there were no fish to eat it. B) Lack of sunlight caused the water to turn green and freeze the fish. C) Excess fertilizer washed into the pond, causing an algae bloom that used up all the oxygen. D) The fish ate the green algae and died from food poisoning.

If a town stops dumping trash into a nearby river but the fish are still dying, which of the following is the most likely "hidden" cause of the water pollution? A) People are swimming in the river too much. B) Rainwater is washing chemical fertilizers from nearby farms into the river. C) The fish are getting too much sunlight. D) The river is flowing too fast for the fish to swim.

A city decides to switch all its coal power plants to solar energy. Which type of pollution will this change help reduce the most? A) Noise pollution B) Air pollution C) Light pollution D) Soil pollution

Many sea turtles mistake floating plastic bags for jellyfish and eat them. This is an example of how pollution: A) Helps animals find new food sources. B) Cleans the ocean floor. C) Disrupts the food chain and endangers wildlife. D) Makes the water clearer for the turtles to see.

If a factory is built near a forest and starts releasing thick black smoke, why might the local bird population decrease even if the birds aren't breathing the smoke directly? A) The smoke makes the birds' feathers too heavy to fly. B) The pollution kills the insects and plants the birds need for food. C) The birds prefer to live in cities with more smoke. D) The smoke turns the trees into a color the birds don't like.

Which word CANNOT be formed using the letters from: CHAMPIONSHIP? A) Picnic B) Sip C) Piano D) Mash