Sadequain Grammar School Time: 15 minutes Subject: Science Class : V

1. Look at the dandelion fruit.Does it look like a parachute?How its structure helps in dispersion.

Yes,by the help of its structure it can easily float and moves from one place to another

Yes,by the help of its structure it can easily moves from one place to another

No,by the help of its structure animals attracts toward it

No,by the help of its structure it can easily moves from one place to another

The dandelion fruit has a structure that resembles a parachute, which allows it to easily float and be carried by the wind. This helps in the dispersion of the fruit, as it can be carried to different locations and spread its seeds effectively.

Explanation

The dandelion fruit has a structure that resembles a parachute, which allows it to easily float and be carried by the wind. This helps in the dispersion of the fruit, as it can be carried to different locations and spread its seeds effectively.

2. The dangers happens when natural gas leaks out because it is flammable,which means that if there's a flame or even a spark in the of a leak,it could cause a fire or explosion. A gas leak can happen if a gas pipe is damaged, like if someone is digging a hole and accidentally brakes an underground gas line.What you think which gas is flammable?

Methane and oxygen

Methane and carbondioxide

Oxygen and nitrogen

Hydrogen and carbondioxide

Methane and oxygen are the correct answer because both gases are highly flammable. Methane is the main component of natural gas and is highly combustible. Oxygen is a key element that supports combustion. When methane and oxygen are present together in the right proportion, they can create a highly flammable environment. If a gas leak occurs and there is a source of ignition, such as a flame or spark, the mixture of methane and oxygen can easily ignite, leading to a fire or explosion.

Explanation

Methane and oxygen are the correct answer because both gases are highly flammable. Methane is the main component of natural gas and is highly combustible. Oxygen is a key element that supports combustion. When methane and oxygen are present together in the right proportion, they can create a highly flammable environment. If a gas leak occurs and there is a source of ignition, such as a flame or spark, the mixture of methane and oxygen can easily ignite, leading to a fire or explosion.

3. You know about seed dispersion.One way of seed dispersion is splitting of fruits, among all option which fruit is not includes in this type of dispersion.

Cotton fruits

Peas

Flame of forest

Angsana

Angsana is the fruit that is not included in the type of seed dispersion mentioned, which is splitting of fruits. The other options, such as cotton fruits, peas, and flame of forest, are known to disperse their seeds through splitting of fruits.

Explanation

Angsana is the fruit that is not included in the type of seed dispersion mentioned, which is splitting of fruits. The other options, such as cotton fruits, peas, and flame of forest, are known to disperse their seeds through splitting of fruits.

4. The gases in the air have different uses,mark the gas with its correct use.

Helium (use to fill balloons and airships)

Argon (used to produce lasers)

Nitrogen (used to fill light bulbs)

Oxygen (used to make fertilizers)

Oxygen is used to make fertilizers because it is an essential element for plant growth. Oxygen is used in the process of aerobic decomposition, where organic matter breaks down and releases nutrients that can be absorbed by plants. This process is crucial for the production of fertilizers, as it helps to enrich the soil with essential nutrients that promote plant growth and improve crop yield.

Explanation

Oxygen is used to make fertilizers because it is an essential element for plant growth. Oxygen is used in the process of aerobic decomposition, where organic matter breaks down and releases nutrients that can be absorbed by plants. This process is crucial for the production of fertilizers, as it helps to enrich the soil with essential nutrients that promote plant growth and improve crop yield.

5. Not all gases are colourless and odourless.Some have colours and strong odours!Match the gas with their colour and odour.

Chlorine

Ammonia

Bromine

Sulphur dioxide

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Sadequain Grammar School Time: 15 Minutes Subject: Science Class : V