Name: Evergreen Self Study in Science for Class 9th
Brand: Amit Book Depot
Price: 550 INR
Availability: InStock

Evergreen Self Study in Science for Class 9th

by Madhurima

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Q1

Why is the cell called the building block of life?

A1

Cells are the smallest structural and functional units of living organisms. All life processes occur within cells, making them the basic building blocks of every living being.
Q2

Differentiate between speed and velocity.

A2

Speed is scalar, measuring only how fast an object moves. Velocity is vector, measuring speed with direction. Velocity changes with change in direction even if speed is constant.
Q3

How does force affect motion? Give one example.

A3

Force can start, stop, speed up, slow down, or change direction of motion. Example: Kicking a stationary football makes it move.
Q4

What is the difference between a mixture and a compound?

A4

Mixtures are physically combined, retain properties of components, and can be separated by physical means. Compounds are chemically bonded with new properties.
Q5

Why do sound waves need a medium to travel?

A5

Sound is a mechanical wave requiring particles (solid, liquid, gas) to vibrate and transfer energy. In vacuum, no particles exist, so sound cannot travel.
Q6

Differentiate between asexual and sexual reproduction.

A6

Asexual reproduction involves one parent, produces identical offspring, no gamete formation. Sexual reproduction involves two parents, gamete fusion, genetic variation.
Q7

What is atomic mass number? Give example.

A7

Atomic mass number = total protons + neutrons in nucleus. Example: Carbon-12 has 6 protons + 6 neutrons = mass number 12.
Q8

Why is classification of living organisms important?

A8

Classification groups organisms based on similarities and evolutionary relationships, making study of diversity, identification, and understanding of life patterns systematic.
Q9

What is the greenhouse effect in Earth’s system?

A9

Greenhouse gases trap heat in Earth’s atmosphere, maintaining suitable temperature for life. Excess gases cause global warming and climate imbalance.
Q10

How do you separate sand and common salt from a mixture?

A10

Add water to dissolve salt, then filter to separate sand. Evaporate filtrate water to obtain salt crystals. This uses solubility difference.

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Have Doubts Regarding This Product ? Ask Your Question

Q1

Why is the cell called the building block of life?

A1

Cells are the smallest structural and functional units of living organisms. All life processes occur within cells, making them the basic building blocks of every living being.
Q2

Differentiate between speed and velocity.

A2

Speed is scalar, measuring only how fast an object moves. Velocity is vector, measuring speed with direction. Velocity changes with change in direction even if speed is constant.
Q3

How does force affect motion? Give one example.

A3

Force can start, stop, speed up, slow down, or change direction of motion. Example: Kicking a stationary football makes it move.
Q4

What is the difference between a mixture and a compound?

A4

Mixtures are physically combined, retain properties of components, and can be separated by physical means. Compounds are chemically bonded with new properties.
Q5

Why do sound waves need a medium to travel?

A5

Sound is a mechanical wave requiring particles (solid, liquid, gas) to vibrate and transfer energy. In vacuum, no particles exist, so sound cannot travel.
Q6

Differentiate between asexual and sexual reproduction.

A6

Asexual reproduction involves one parent, produces identical offspring, no gamete formation. Sexual reproduction involves two parents, gamete fusion, genetic variation.
Q7

What is atomic mass number? Give example.

A7

Atomic mass number = total protons + neutrons in nucleus. Example: Carbon-12 has 6 protons + 6 neutrons = mass number 12.
Q8

Why is classification of living organisms important?

A8

Classification groups organisms based on similarities and evolutionary relationships, making study of diversity, identification, and understanding of life patterns systematic.
Q9

What is the greenhouse effect in Earth’s system?

A9

Greenhouse gases trap heat in Earth’s atmosphere, maintaining suitable temperature for life. Excess gases cause global warming and climate imbalance.
Q10

How do you separate sand and common salt from a mixture?

A10

Add water to dissolve salt, then filter to separate sand. Evaporate filtrate water to obtain salt crystals. This uses solubility difference.

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