All-in-One Exam Prep Platform

Explanation

The stratospheric ozone layer is Earth's “sunscreen”  protecting living things from too much ultraviolet radiation from the sun.

Oxygen layer in the atmosphere

Ozone protects us from the harmful ultraviolet radiation of the sun.

Ozone formula: O3

The ozone layer lies approximately 15-40 kilometers (10-25 miles) above the Earth's surface, in the stratosphere.

The ozone layer is depleting: Air pollution

Explanation

The most abundant gas in the atmosphere is nitrogen, with oxygen second.

Argon, an inert gas, is the third most abundant gas in the atmosphere.

Explanation

Because sound is just vibrating air, space has no air to vibrate and therefore no sound in a vacuum.

Sound waves below 20 Hz are known as infrasound.

Sound waves above 20 kHz are known as ultrasound

Sound waves transmit a medium such as a gas, liquid, or solid.

• The speed of sound in air is about 343 meters per second
• The sound travels at 1,481 m/s in water 
• The speed of sound in a vacuum is zero meters per second.

Explanation

• Humidity in the air was measured by a Hygrometer.
• ****
  
• A hygrometer is an instrument used to measure relative humidity.
• Humidity is the measure of the amount of moisture in the air.
• A psychrometer is an example of a hygrometer.
• hygrometer.
  
• 
  
• ***
• The humidity in the air tells us about the ratio of Water vapors in the air

Explanation

The percentage of oxygen in the air is about 20.95%.

The air is made up of many gases, including oxygen, nitrogen, argon, and carbon dioxide

***

Nitrogen

Nitrogen is the most abundant gas in the air, making up about 78% of it. 

Argon

Argon is the third most abundant gas in the air, making up about 0.93% of it. 

Carbon dioxide

Carbon dioxide is present in trace amounts in the air, making up about 0.04% of it. 

Explanation

An anemometer is an instrument that measures wind speed.

This type of anemometer has a spinning wheel.

Additional Information:

A hygrometer is an instrument used to measure humidity

A salinometer is used to measure the salinity

A bolometer is used to measure the power of incident electromagnetic radiation

A barometer is used to measure air pressure in certain environment.

Explanation

Note: according to Fpsc answer key  the correct  ans is green light

Since the maximum absorption by chlorophyll occurs in red light.

It is the most effective wavelength for photosynthesis.

Chlorophyll strongly absorbs red light.

Thus it is effective at photosynthesis.

All important questions and Information Related to 'Photosynthesis"

Photosynthesis takes place in the presence of the following light Only in sunlight from the sun

Photosynthesis takes place faster in white light

Photosynthesis occurs more in blue and red light rays

Photosynthesis occurs more in blue and red light rays and less, or not at all, in green light rays.

ND2-03-2023

Explanation

Explanation

Ecology is the study of interrelationships between organisms and with their environment.

It is also known as environmental science.

It's a branch of biology that examines how living things interact with their physical surroundings.

Explanation

Troposphere is the lowest layer of the atmosphere where all weather phenomena occur and where we live.

Exosphere is the outermost layer, gradually merging into space, containing very thin air and satellites.