Why carbon dioxide is an important gas for plants to make organic matter

Therefore, the section "The Making of Organic Matter – Photosynthesis" is both the focus of this chapter and the book as a whole. What gases do green plants release when exposed to light? This gas is not purified with plants.

Carbon dioxide. It is through the pores on the surface of the plant leaves, which can be opened and closed to absorb and release gas.

The switch of the stomata is related to the water potential of the guard cell, the water potential of the guard cell decreases and the water absorption expands, the stomata open, the water potential rises and the water loss shrinks, so that the stomata are closed. Stomata are usually found in the aerial parts of plants, especially on the leaf epidermis, and can also be seen on young stems and petals, but most submerged plants do not.

Photosynthesis. It is necessary for the opening of the stomata. The guard cells of yellowed leaves do not have chlorophyll.

Photosynthesis is not possible, and stomatal movement does not occur under the influence of light.

There are pores on the surface of plant leaves, which can be opened and closed to absorb and release gases.

Answer: Photosynthesis.

Analysis: Analysis:

According to the analysis of existing knowledge, the way of carbon dioxide consumption in nature is the photosynthesis of plants;

Plants absorb oxygen and produce gases such as carbon dioxide and carbon dioxide. （）

a.That's right. b.Mistake.

Correct answer: Lu Meng B

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=

Photosynthesis of green plants refers to the process of green plants in the chloroplasts of cells, using light energy to synthesize carbon dioxide and water into organic matter, release oxygen, and convert light energy into chemical energy and store it in the organic matter produced The organic matter produced not only meets the needs of green plants for their own growth, development and reproduction, but also provides basic food for other organisms in the biosphere**

Therefore, d

Innovative design of "Experimental Innovation for the Production of Carbon Dioxide by Green Plant Respiration" (2).

Plants produce organic matter through photosynthesis, and the return to the inorganic environment into carbon dioxide and water is through respiration, [plants and people also have to breathe, and during the day, it is only that the intensity of photosynthesis during the day is greater than that of respiration, and it cannot be expressed].

As for the absence of animals, that's not going to work. Plants and animals are important links in the food chain [producers and consumers respectively] The relationship between the two is indispensable, without plants and animals there is no food, and oxygen; Plants cannot grow well without animals, because without the restraint of animals, the number of plants will increase greatly, and finally they will not survive due to the intensification of intraspecific struggles; There are also microorganisms in animals that can decompose organic matter and turn it into easily absorbed inorganic matter, which is conducive to plant absorption. The symbiotic relationship between rhizobia and legumes is a good example: Some plants also rely on animals to reproduce their offspring.

Carbon is absorbed and solidified by plants, which is called the main component of trees, but the trees themselves rely on photosynthesis to do this, and when there is no sunlight at night, trees exhale carbon dioxide just like animals. Water is fluid, and on the one hand, it is absorbed by the trees and at the same time it is volatilized by the trees. When the wood is used as fuel, a large amount of carbon dioxide is emitted when it is burned, and all the water evaporates.

In the end, even if there are no animals and plants, this process will not be affected, but without animals, many plants may not be able to pass on to their ancestors.

Transpiration is the process of water being lost from the surface of a living plant body (mainly leaves) to the atmosphere in a state of water vapor, which is different from the evaporation process of physics, transpiration is not only affected by external environmental conditions, but also regulated and controlled by the plant itself, so it is a complex physiological process. When plants are young, all surfaces exposed to air can transpire.

External factors influencing transpiration.

1) Light: Light promotes the opening of the stomata and increases transpiration. (2) Moisture status:

Sufficient moisture is conducive to the opening of the stomata, and too much moisture will close the stomata instead. (3) Temperature: The opening of the stomata generally increases with the increase of temperature, but the increase of water loss due to high temperature can also make the stomata close.

4) Wind: Breeze is good for transpiration, and strong wind transpiration is reduced. (5) CO2 concentration:

Low CO2 concentrations promote stomatal opening and increased transpiration. Indicators of transpiration: transpiration intensity (transpiration rate), transpiration efficiency, transpiration coefficient.

Ways to reduce transpiration: (1) reduce transpiration area; (2) improve the plant ecological environment; (3) Application of anti-transpiration agent. If there is excessive transpiration, the plant is prone to wilting.

Plants produce transpiration in general, in order to maintain the balance of water and salt in the plant body, promote the transportation of water and nutrients in the roots, etc., as for the release of carbon dioxide, it is due to the fact that any metabolism must have a balanced process, due to the influence of the surrounding environment, the amount of carbon dioxide released is different, because plant cells also need to carry out respiration.

Transpiration is the power of plants to absorb water and transport substances, most of which can be generated, and when plants are severely short of water, they close their stomata to reduce transpiration. Groundwater is not always exhausted, and plants themselves have to respire to produce nutrients and energy.

His roots are not directly inserted into the water.

Transpiration is one of the driving forces for plants to absorb water, and plants can reduce the surface temperature through transpiration to prevent high temperature burns. Oxygen and organic matter are the products of photosynthesis in plant chloroplast-containing cells, while carbon dioxide is the product of respiration, and photo-harmony can only be carried out by chloroplast-containing cells, and respiration is the life activity that all living cells have.

a. The skin formation of air is calculated by volume, and the oxygen of the potato accounts for about 21%, so the statement A is correct;

b. Oxygen can supply breathing and is often used in medical emergencies, so B is correct;

c. Nitrogen is stable in nature, and nitrogen is commonly used as protective gas when welding metals, so C is correct;

d. Carbon dioxide.

It is one of the important raw materials for plant photosynthesis, so d is wrong, so D is chosen