Explanation

Earth, Mars, and Pluto have atmospheres that contain Nitrogen gas.

• Earth: ~78% nitrogen
• Mars: ~2.6% nitrogen
• Pluto: thin atmosphere with nitrogen ice and gas

Neptune's atmosphere is mostly hydrogen, helium, and methane, not nitrogen.

Explanation

Xylem and Phloem are specialized conducting tissues in vascular plants:

Xylem: Transports water and minerals from roots to other parts (unidirectional).

Phloem: Transports sugars (photosynthates) from leaves to other parts (bidirectional).

Explanation

A keyboard is a physical input device, so it is considered hardware.

It allows the user to interact with the computer by typing commands or data.

Explanation

A constellation is a group of stars forming a pattern, located outside our solar system.

Asteroids, satellites, and comets are all within the solar system.

Explanation

Let's break down Aslam's movements:

1. 3 km east

2. 6 km north

3. 5 km east

Total eastward distance = 3 + 5 = 8 km

Aslam's position forms a right-angled triangle with the starting point:

Eastward distance = 8 km (base)

Northward distance = 6 km (height)

Using the Pythagorean theorem to find the distance from the starting point:

distance = √(8² + 6²)

= √(64 + 36)

= √100

= 10 km

Explanation

By: Used to express the method or means (e.g., by car, by bus, by walk).

Example: "He travels by walk every day."

Explanation

Galileo Galilei was a renowned astronomer, often called the "father of modern observational astronomy."

He made key improvements to the telescope and supported the heliocentric theory.

Explanation

Biology is classified as a natural science.

Because it studies living organisms and life processes through observation and experimentation.

Key Points:

Natural Sciences include:

1. Biology (study of life)
2. Physics (matter/energy)
3. Chemistry (substances/reactions)

Explanation

Hectic means بہت مصروف یا افراتفری

Calm means پرامن اور مصروف نہیں

Explanation

We use "died of" to indicate the cause of death, especially with diseases.

Example: She died of cancer / cholera / a heart attack.