TEST YOUR SCIENTIFIC KNOWLEDGE

2.

Which characteristic is found only in mammals???

Eyes that detect colour
Glands that make milk
Skin that absorbs oxygen
Bodies that are protected by scales

Correct Answer

A. Glands that make milk

Explanation

Mammals are the only animals that possess glands that produce milk. This is a distinguishing characteristic that sets them apart from other animals. While some mammals, like humans, have highly developed mammary glands for breastfeeding their young, even the most primitive mammals have some form of milk-producing glands to nourish their offspring. This unique ability to produce milk is a defining feature of the mammalian class.

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3.

What is the primary function of the large leaves found in the seedlings growing in the forest???

To provide shade for root systems
To get rid of excess water that is entering through the roots
To allow for leaf damage by insects
To gather as much light as possible for photosynthesis

Correct Answer

A. To gather as much light as possible for photosynthesis

Explanation

The large leaves found in seedlings growing in the forest have the primary function of gathering as much light as possible for photosynthesis. Photosynthesis is the process by which plants convert sunlight into energy, and leaves play a crucial role in this process by capturing sunlight and using it to produce food for the plant. The larger the leaves, the more surface area they have to absorb sunlight, maximizing the plant's ability to photosynthesize and grow.

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4.

Shown here is the life cycle of the common frog. If we compare the adult frog to the tadpole,we would see that there are no visible similarities between them.A complete change in physical appearance happens through various stages from tadpole to adult. Given below are the stages of development in various organisms.Whose development is similar to that of the frog???

Egg>>>Chick>>>Hen>>>Egg
Egg>>fry>>Adult fish>>Egg
Egg>>duckling>>Duck>>Egg
Egg>>caterpilar>>pupa>>butterfly>>Egg

Correct Answer

A. Egg>>caterpilar>>pupa>>butterfly>>Egg

Explanation

The correct answer is "Egg>>caterpillar>>pupa>>butterfly>>Egg". This is because, similar to the life cycle of a frog, the development of a butterfly also involves a complete change in physical appearance through different stages. The process starts with an egg, then goes through the caterpillar stage, followed by the pupa stage, and finally, the adult stage as a butterfly. The cycle then starts again with the laying of eggs.

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5.

Iron can be found in the solid as well as the liquid state.A single iron atom in the solid state is _______________that in the liquid state.

Smaller than
Heavier than
Bigger than
The same as

Correct Answer

A. The same as

Explanation

In the solid state, the iron atoms are closely packed together and have a regular arrangement, which makes them more dense. In the liquid state, the iron atoms have more freedom of movement and are less closely packed, resulting in a slightly lower density. Therefore, a single iron atom in the solid state is the same size as a single iron atom in the liquid state.

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6.

If we consider the constituent atoms of the moon and the earth,we will find that....

The moon and the earth are made up of the same basic elements
The moon and the earth are made up of the same single element
The moon is made up of elements that are totally different from those of the earth.
The moon and the earth are each made up of a single element,but they are different.

Correct Answer

A. The moon and the earth are made up of the same basic elements

Explanation

The correct answer is that the moon and the earth are made up of the same basic elements. This means that both the moon and the earth contain similar types of atoms and chemical elements in their composition. This is supported by scientific evidence and studies that have analyzed the composition of both celestial bodies.

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1

7.

Three gases found in the Earth's atmosphere are carbon dioxide,nitrogen and oxygen.What is their order of abundance from greatest to least????

Nitrogen,Oxygen,Carbon Dioxide
Nitrogen,Carbon Dioxide,Oxygen
Oxygen,Nitrogen,Carbon Dioxide
Carbon Dioxide,Oxygen,Nitrogen

Correct Answer

A. Nitrogen,Oxygen,Carbon Dioxide

Explanation

The correct answer is Nitrogen, Oxygen, Carbon Dioxide. This is because nitrogen makes up about 78% of the Earth's atmosphere, while oxygen makes up about 21%. Carbon dioxide, on the other hand, is present in much smaller quantities, making up less than 1% of the atmosphere. Therefore, nitrogen is the most abundant gas, followed by oxygen, and then carbon dioxide.

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8.

Antibiotics are drugs used against bacterial infections.One of the most common side effects of antibiotics is diarrhoea.Scientists wanted to find out if eating yogurt can lessen the side effects of the medication.For this they gave yogurt to a group of people on antibiotics,who were known to suffer the side effects of antibiotics and recorded the observations.In order to reach a conclusion for the study,which of the following needs to be measured???

The frequency and duration of fever
The incidence and severity of diarrhoea
The water loss caused due to diarrhoea
The count of pathogenic bacteria in the blood

Correct Answer

A. The incidence and severity of diarrhoea

Explanation

The study aims to determine if eating yogurt can lessen the side effects of antibiotics, specifically diarrhoea. Therefore, the most relevant factor to measure would be the incidence and severity of diarrhoea. This would provide information on whether or not yogurt consumption has an impact on reducing the side effects of antibiotics in terms of diarrhoea. Measuring the frequency and duration of fever, the water loss caused due to diarrhoea, or the count of pathogenic bacteria in the blood would not directly provide information on the effectiveness of yogurt in reducing antibiotic side effects.

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9.

Some white blood cells destroy harmful bacteria within the human body by engulfing them and digesting them,in the same way that amoeba engulf their food.Which of the following characteristics of some white blood cells allows them to do this???

The ability to divide
The presence of a nucleus
The ability to change shape
The absence of any haemoglobin

Correct Answer

A. The ability to change shape

Explanation

Some white blood cells are able to change shape, which allows them to engulf and digest harmful bacteria within the human body. This ability is similar to how amoeba engulf their food. By changing shape, white blood cells can surround and engulf bacteria, forming a protective barrier around them. Once engulfed, the white blood cells can then digest and destroy the bacteria. The presence of a nucleus, the ability to divide, and the absence of any haemoglobin are not directly related to the process of engulfing and digesting bacteria.

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Test Your Scientific Knowledge

Cells that conduct messages are known as.....

Quiz Preview

Which characteristic is found only in mammals???

What is the primary function of the large leaves found in the seedlings growing in the forest???

Iron can be found in the solid as well as the liquid state.A single iron atom in the solid state is _______________that in the liquid state.

If we consider the constituent atoms of the moon and the earth,we will find that....

Three gases found in the Earth's atmosphere are carbon dioxide,nitrogen and oxygen.What is their order of abundance from greatest to least????

Some white blood cells destroy harmful bacteria within the human body by engulfing them and digesting them,in the same way that amoeba engulf their food.Which of the following characteristics of some white blood cells allows them to do this???