Carbon dioxide is a raw material for plant photosynthesis, and the amount of carbon dioxide in the a

Are you a junior high school student? I'm the best of the top science students in the third grade. I just finished my high school exam.

See your questions clearly!

What you're saying is"air"

It's in the atmosphere (i.e., the air around us).

Let me translate what you said:"Every effort should be made to increase the amount of carbon dioxide in the air"

You say:'We should try to increase CO2 (i.e. encourage people to drive more. Burn things more. The amount contained in the air.

If the amount of CO2 in the air is increased from the current level. It will cause the greenhouse effect, ecological imbalance, melting glaciers, and rising sea levels.

If you don't take into account the greenhouse effect, ecological imbalance, melting glaciers, and sea level rise, you can also do that. That's what I'm talking about below.

If CO2 is high in the air. And there's no greenhouse effect, no ecological imbalance, no melting glaciers, no sea level rise, and so on.

The amount of CO2 has increased. The content of O2 is reduced accordingly.

Then. Globally, 6 billion people will not die from lack of oxygen. There are other creatures as well.

Summary: From a scientific point of view.

Is it still right to exterminate humanity?

The environment can directly or indirectly affect humans.

Greenhouse effect, ecological imbalance, melting glaciers, rising sea levels.

Is it good for humans?

Other than that. CO2 does promote crop growth.

However, increasing CO2 levels should not be in the atmosphere.

Ever heard of greenhouse growing?

It's about growing crops in a transparent tent.

Burning carbon in the tent increases the CO2 content in the tent.

Then you won't be afraid to affect the atmosphere (don't forget that plants can turn CO2 into O2...).That's all for now. What a hard fight!

Do you have any junior high school science questions that you can ask me?

The air is made up of a variety of gases, each of which accounts for a certain proportion, and this proportion has been adapted to the life of the earth, and if a large change in the composition of a certain gas causes the organisms to become unadapted and extinct, the various components of the air must be kept in balance, and the c02 of the earth's atmosphere is 0A few percentage points is terrifying!

Too much carbon dioxide is concentrated to hinder the respiration of plants, which is not good for the metabolism of plants.

It can help crops grow, yes.

So how much is the loss?

The greenhouse effect, species extinction, ecological imbalance, melting glaciers, rising sea levels.

To put it simply. This act is to eat and wait for death.

If the amount of carbon dioxide in the air is too high.

Plants are not able to undergo aerobic respiration, which affects the normal growth of plants.

Food is necessary for human survival, and it can sustain human life, so it should be eaten wildly

Answer: The organic matter produced by green plants through photosynthesis not only meets their own needs for growth, development and reproduction, but also provides basic food**, oxygen**, and energy for other organisms in the biosphere** Green plants consume carbon dioxide in the atmosphere through photosynthesis, release oxygen (more than their own oxygen needs), and maintain the relative balance of carbon dioxide and oxygen in the biosphere Raw materials for photosynthesis: carbon dioxide and water; Product:

organic matter and oxygen; Conditions: Light Energy, Place: Chloroplast The formula for photosynthesis is:

Carbon dioxide + water Light energy x09 x09 chloroplast Organic + oxygen So the answer is: respiration, gas, carbon dioxide, carbon dioxide, oxygen, carbon-oxygen.

In addition to carbon dioxide, plants that perform photosynthesis need water and sunlight. In photosynthesis, the chlorophyll of plants uses sunlight energy to break down water molecules into oxygen and hydrogen ions, and hydrogen ions and carbon dioxide to produce glucose and oxygen. Therefore, sunlight and water are necessary for photosynthesis to take place.

Photosynthesis refers to the process by which plants synthesize organic matter using light energy. This process occurs within chloroplasts, where chloroplast pigments convert carbon dioxide and water into organic substances (such as glucose) and oxygen by absorbing sunlight energy.

In this process, carbon dioxide is one of the important raw materials for the synthesis of organic matter, but plants also need other substances to complete photosynthesis.

First of all, plants need water. Water molecules are activated by light energy within chloroplasts, and through light reactions during photosynthesis, water molecules are broken down into oxygen and hydrogen ions. The energy generated by the reaction of hydrogen ions and another type of light drives the synthesis of organic matter from CO2 and H2O.

Second, plants need sunlight. Sunlight is an energy source necessary for photosynthesis, and the chloroplasts of plants absorb the light energy from sunlight and convert it into chemical energy for the synthesis of organic matter.

In conclusion, in photosynthesis, plants need carbon dioxide, water, and sunlight, which work together to complete the process of synthesizing organic matter.

Water is also needed, the enzyme involved in the reaction.

The density of carbon dioxide is 2 kg m3 and the unit conversion is: 2 g liters. 8 liters of carbon dioxide mass 16 grams. According to the chemical equation:

caco3+2hcl=cacl2+h2o+co2↑100 44

For every 100 grams of calcium carbonate, 44 grams of carbon dioxide can be produced by the complete reaction, so the required mass of calcium carbonate is: 16 100 44 grams).

m=pv=2×8=16g

Solution: Let the mass of calcium carbonate be x

caco3+2hcl=cacl2+h2o+co2↑100 44

x 16100/44=x/16

x = 36g A: The mass of calcium carbonate required is 36g.

8 liters is 8 cubic decimeters, that is, cubic meters, so carbon dioxide has 2 kg = 16 grams 2HCl + CAC3 CACl2 + H2O + CO2 --100---44---m---16100 m = 44 16

m = so at least grams of calcium carbonate are needed.

The quality of CO2 is sought first.

Convert to 2 g l

So the mass of 22LCO2 is 44g

caco3---co2

10044x44

x=100g

Pure CaCO3 is required for 100g

Now there is 10% impurity, so y=

Option B, the process of photosynthesis:

Photoreaction stage The chemical reaction in the first stage of photosynthesis must have light energy to proceed, and this stage is called the photoreaction stage. The chemical reaction in the photoreaction stage is carried out on the thylakoids within the chloroplast.

Dark Reaction Phase The chemical reaction in the second phase of photosynthesis can be carried out without light energy, and this stage is called the dark reaction phase. The chemical reactions in the dark reaction phase are carried out in the matrix within the chloroplast. The light reaction stage and the dark reaction stage are a whole, and in the process of photosynthesis, the two are closely related and indispensable.

The importance of photosynthesis Photosynthesis provides material and energy for the survival of almost all living things, including humans. Therefore, photosynthesis is of great significance for humans and the entire biological world. The significance of photosynthesis can be summarized as follows;

First, the production of organic matter. The amount of organic matter produced by green plants through photosynthesis is enormous. It is estimated that the green plants on the planet produce about four or five hundred thousand tons of organic matter each year, which is far more than the total annual production of industrial products on the planet.

Therefore, people compare the green plants on the earth to a huge "green factory". The survival of green plants is inseparable from the organic matter produced by themselves through photosynthesis. Both human and animal food also come directly or indirectly from organic matter produced by photosynthesis.

Second, convert and store solar energy. Green plants convert solar energy into chemical energy through photosynthesis and store it in organic matter made by photosynthesis. Almost all living things on the earth directly or indirectly use this energy as the energy source for life activities.

The energy contained in fuels such as coal, oil, and natural gas was, in the final analysis, stored by ancient green plants through photosynthesis.

Third, the content of oxygen and carbon dioxide in the atmosphere should be relatively stable. It is estimated that the oxygen consumed by all living beings in the world through respiration and by burning various fuels averages 10,000 t s (tonnes per second). At this rate of oxygen consumption, it would only take about 2,000 years for the atmosphere to run out of oxygen.

However, this did not happen. This is because green plants are widely distributed on the earth and are constantly absorbing carbon dioxide and releasing oxygen through photosynthesis, so that the amount of oxygen and carbon dioxide in the atmosphere remains relatively stable.

Fourth, it plays an important role in the evolution of living things. Before the advent of greenery, there was no oxygen in the Earth's atmosphere. It was only 2 billion to 3 billion years ago that green plants appeared on the earth and gradually became dominant, and the earth's atmosphere gradually contained oxygen, so that other organisms on the earth that carried out aerobic respiration could occur and develop.

As part of the oxygen in the atmosphere is converted into ozone (O3). The ozone layer formed by ozone in the upper atmosphere can effectively filter out ultraviolet rays that have a strong destructive effect on living organisms in solar radiation, so that aquatic organisms can gradually live on land. After a long process of biological evolution, a variety of animals and plants widely distributed in nature finally appeared.

The answer is wrong, it should be B.

Photosynthesis is divided into the following two parts:

Photoreaction: A reaction that occurs directly under light.

Dark reaction: A reaction that takes place in a dark place that does not require light.

From the perspective of energy conversion, photosynthesis is divided into three processes: absorption, transfer and conversion of light energy, conversion of electrical energy into active chemical energy, and conversion of active chemical energy into stable chemical energy, where the latter two processes do not require the presence of light.

Light 6CO2 + 12H2O——

Since C6H12O6+6O2+6H2O

Chlorophyll in seawater bai

H2O+CO2 - H2CO3 Reversible reaction light 6CO2+12H2O—— C6H12O6+6H2O+6O2 planktonic algae.

Dunacol NH3+H2O CO2 – NaHCO3 NH4Cl Ammonia produced by the corpses of animals and plants

(l)a：①⑤b：⑦；d: (or a: b: ; d: 3 points); ABCFG (or AFGBE) (2 points).

2) Accurate (1 point); CO2 is one of the raw materials for plant photosynthesis, and the volume of CO2 consumed by plant photosynthesis can be estimated from the volume of water entering the jar (2 points).

3) Change in the mass of the plant or change in the quality or volume of water in the container in which the plant is cultivated (2 points).

(l)a：①⑤b：⑦；d: (or a: b: ; D: ABCFG (or AFGBE).

2) Accurate (1 point); CO2 is one of the raw materials for plant photosynthesis, and the volume of CO2 consumed by plant photosynthesis can be inferred from the volume of water entering the jar.

3) A change in the mass of the plant or a change in the quality or volume of water in the container in which the plant is cultivated.

The same jar is respectively put into a certain plant seedling with the same growth and size and the same volume of water, the dropper at the mouth of the bottle is filled with NaOH concentrated solution, and then different volumes of pure carbon dioxide gas are filled into three bottles, and the components of the filled gas are: bottle A: 2000 ml of air; A bottle:

1600 ml air, 400 ml CO2; C bottle: 1400 ml of air, 600 ml of CO2, all three sets of devices are shown in the figure on the right. (3) Put the three sets of devices in the same place, after the same amount of sunlight for the same amount of time, squeeze the dropper, and after the full reaction, open the water stop clamp to observe the volume of water entering the three bottles.

The rate change of plant respiration is negligible) Please answer the following questions: (1) The instrument and drug required to prepare pure carbon dioxide gas are (the instrument name is indicated by the capital letter under the instrument, and the serial number of the drug is written inside), connect the selected instrument as required, and the order of each interface from left to right is sequential.

The topic is too long to read.

The rate of photosynthesis in plants depends on the intensity of light, carbon dioxide concentration, and temperature, and the rate of respiration is also temperature-dependent, with no fixed ratio.

The organic matter produced by green plants through photosynthesis not only meets their own needs for growth, development and reproduction, but also provides basic food**, oxygen**, and energy for other organisms in the biosphere** Green plants consume carbon dioxide in the atmosphere through photosynthesis, release oxygen (more than their own oxygen needs), and maintain the relative balance of carbon dioxide and oxygen in the biosphere Raw materials for photosynthesis: carbon dioxide and water; Products: organic matter and oxygen; Conditions:

Light energy, place: chloroplast The formula for photosynthesis is: carbon dioxide + water.

Organic matter (stored energy) + oxygen

So the answer is: