2nd October 2019

nature-education

17

What are the gases needed for the support of life?

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Nitrogen, oxygen and argon make up the chief of these gases at approximately 78, 21, and 1 percent by volume. Small amounts of water vapor, carbon dioxide, methane, nitrogen dioxide and sulfur dioxide are also part of our air. Nitrogen (N2) is one of the most common elements that makes up our air and earth.

Similarly, you may ask, what happens to the other gases we breathe in?

Basically when air fills our alveoli, by the process of diffusion, only oxygen in the air is taken into the blood stream while the other gases along with the waste CO2 is exhaled. So you do breathe in nitrogen, but it is exhaled as it is by the body.

What is the main gas in the air that we breathe?

The most common gas people breathe from clean air is nitrogen. Air is a mixture of gases, and the air on Earth contains about 78 percent nitrogen and about 21 percent oxygen. Argon, carbon dioxide neon, helium, methane, krypton, hydrogen and xenon are in much smaller amounts.

What gas do we need to survive?

Nitrogen and oxygen make up about 99 percent of Earth's air. People and other animals need oxygen to live. Carbon dioxide, a gas that plants depend on, makes up less than .04 percent. Plants and animals each produce the gases that the other needs to live.

1

Why air is necessary for us?

Air plays a vital role in recycling one of Earth's most important substances: carbon. Animals and humans also release carbon dioxide into the air when they breathe. Through a process called photosynthesis, plants extract carbon dioxide from the air and use it to produce energy.

2

What is the difference between the air we inhale and exhale?

The difference between the amount of oxygen in inhaled and exhaled air is equal to the difference in the amount of carbon dioxide in exhaled and inhaled air. The special adaptions of the alveoli for gas exchange are: Thin walls.

3

What are the conditions necessary for life on Earth?

Conditions for life on earth

Water.
Temperature. Most of the planet is above 0°C, so water in organisms does not freeze.
Gases. The appropriate mix of gases are needed such as CO2for photosynthesis, oxygen for respiration and nitrogen for protein synthesis.
Light and solar radiation. Sunlight provides energy for photosynthesis.

4

What were the first living things on Earth?

The first living things on Earth, single-celled micro-organisms or microbes lacking a cell nucleus or cell membrane known as prokaryotes, seem to have first appeared on Earth almost four billion years ago, just a few hundred million years after the formation of the Earth itself.

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What makes the Earth habitable for life?

What makes the Earth habitable? It is the right distance from the Sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atmosphere, and it has the right chemical ingredients for life, including water and carbon.

6

Why is it important to life on Earth?

Earth has a breathable atmosphere. Oxygen is the gas that is required for the life of most creatures. This is present in Earth's atmosphere and also in water. This is a poisonous gas which makes up most of the atmosphere of planets like Venus and Mars and makes them unable to support human life.

7

Which gas is produced by respiration?

Respiration takes place in the plant's cells, using oxygen to produce energy and giving off carbon dioxide as a waste product. So in terms of the gas taken in and the gas given out, respiration is the opposite of photosynthesis.

8

What do we need for life?

Air: Air is made up of several gases, but the two most important gases are Oxygen and Carbon dioxide. Without oxygen, animals will die, and without carbon dioxide, plants cannot survive. Food (nutrients): Living things need energy for function. Energy is needed to grow, reproduce, move, and to work.

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What does life need to survive?

In order to survive, animals need air, water, food, and shelter (protection from predators and the environment); plants need air, water, nutrients, and light. Every organism has its own way of making sure its basic needs are met.

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What are the factors that make the planet habitable?

Astronomical Properties. For a planet to sustain life, it has to be a comfortable distance away from a star, such as the sun of our solar system. Around a star, there is a shell-shaped region of space, called the Habitable Zone (HZ), where a planet can maintain liquid water on the surface.

11

Is light a requirement for all life?

Life needs some water, but deserts show that even a little can be enough. Only a small amount of light from the central star is required to provide for photosynthesis. Some nitrogen must be present for life and the presence of oxygen would be a good indicator of photosynthesis and possibly complex life.

12

How did the moon?

Also, this hypothesis does not have a natural explanation for the extra baking the lunar material has received. The Condensation Theory: This theory proposes that the Moon and the Earth condensed individually from the nebula that formed the solar system, with the Moon formed in orbit around the Earth.

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Which gases are important to sustaining life?

The greenhouse gases absorb some of this energy and radiate much of it back towards the surface whilst the rest is radiated out to space. This plays an important role in keeping the Earth's surface warm and able to sustain life.

14

What constitutes a life?

The definition of life is controversial. The current definition is that organisms are open systems that maintain homeostasis, are composed of cells, have a life cycle, undergo metabolism, can grow, adapt to their environment, respond to stimuli, reproduce and evolve.

15

How the air is produced?

As Matt Westwood says, oxygen is produced by plant photosynthesis. They facilitate a chemical reaction using NO_3 as an input and producing energy, N_2, and probably O_2. So, basically, living things make air. Bacteria make nitrogen, plants make oxygen and animals make carbon dioxide (plus methane when they fart).

16

How many moons are in the inner solar system?

There are four other dwarf planets in the solar system that we know of besides Pluto. These are Eris, Makemake, Haumea, and Ceres, which can be found well beyond Neptune into the outer limits of the solar system. Each has one or a couple of moons. Haumea has two moons, Hi'iaka and Namaka.

17

What is the habitable zone?

In astronomy and astrobiology, the circumstellar habitable zone (CHZ), or simply the habitable zone, is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure.

18

What is meant by the term Goldilocks zone?

The Goldilocks Zone refers to the habitable zone around a star where the temperature is just right - not too hot and not too cold - for liquid water to exist on an planet. Looking for planets in the Goldilocks Zone is a way that allows scientists to hone in their search for Earth-like planets that could contain life.

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What gas do we need to breathe in order to stay alive?

The permanent gases in air we exhale are roughly 78 per cent nitrogen, 15 to 18 per cent oxygen (we retain only a small amount), 4 to 5 per cent carbon dioxide and 0.96 per cent argon, the CO2 being of course used by plants during photosynthesis.

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Where is oxygen produced?

These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. In fact, all the plants on Earth incorporate symbiotic cyanobacteria (known as chloroplasts) to do their photosynthesis for them down to this day.

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