Ask a question about auxin, and ask an urgent experimental question about auxin.

Because different concentrations have different effects on different plants. As for that concentration, it still needs to be studied. I don't know. Above or below that concentration has different effects.

We eat the seeds of sunflowers, which are melon seeds, and the seedless fruits of sunflowers are melon seed skins, obviously, we don't eat melon seed ......skins

During the flowering period of tomatoes, pollination was affected by successive rainy days, so after the administrator sprayed a certain concentration of auxin in time, it could only save a little, and the yield would not increase.

What we need is the pulp of the tomato and not the seeds, whereas the sunflower needs the seeds. Auxin promotes the development of the individual, and the fruit sprayed with auxin is seedless, so the tomato is not affected, while the sunflower has a great influence.

Oh my God, you're just as confused as I was

I've looked at a few similar variation questions and think it should be like this:

Clarify who to compare first: after treatment, compare with normal conditions (pollination can be done normally).

Tomato: Similar to the formation of seedless tomatoes, fruits are formed by flowering and pollination under normal conditions, and now seedless tomatoes can be formed under the action of auxin without pollination. So it should be the same compared to the original.

Melon seeds: Without pollination, seeds cannot be formed, auxin can only promote growth, and no matter how much melon seed skin is, it is useless, so it is reduced compared to normal.

Similar variation questions.

I should have made it clear == What's wrong, we're talking.

The "single variable" principle needs to be followed in the design of biological experiments, so the words "same and appropriate" are often used when describing culture conditions, which means that all other factors must be the same except for the experimental variables; Suitable is used to ensure the normal growth of organisms.

The experiments in group A and group B were different only in the experimental variable (ultraviolet light of a certain intensity), and the others were exactly the same.

If group B does not add visible light, the most important thing is that it cannot grow normally. Compared with group A, the use of ultraviolet light and the use of visible light are two variables, and the principle of "single variable" is not followed.

Synthesize it yourself, I can't think of a particularly smooth statement for a while, and I will synthesize a few of them:

1. Normal photosynthesis of plants requires visible light.

2. The use of ultraviolet light alone without visible light cannot ensure the normal photosynthesis of plants.

3. If the photosynthesis of normal vertical beats cannot be guaranteed, it cannot be said that the inhibition of plant growth is only the effect of ultraviolet light, or it can be caused by insufficient light.

I choose DThe reason is as follows: the edamame people eat seeds, because the edamame is underdeveloped due to some factors during the cultivation process, which affects pollination and fertilization, then the seeds that are well fertilized will not be available, so no matter what, they can no longer get mature edamame, and the above measures cannot be used, because they cannot make up for the lack of normal fertilization.

The point of this question is to distinguish whether you are eating seeds or ovary!

The effects of n and p on plants are all in the biology books, auxin promotes the development of plants, but without pollination and fertilization, there will be no outdated development, which can not be supplemented by any measure.

b Boron: promotes the germination of pollen and the elongation of pollen tubes.

n is an essential element that makes up chlorophyll, proteins, and nucleic acids. The compounds formed by N in the plant are unstable or soluble in water, so N can move freely in the plant body, and when N is lacking, the young leaves can absorb N to the old leaves, resulting in the old leaves turning yellow. N is a chemical element that can easily cause eutrophication in aquatic ecosystems, in aquatic ecosystems, too much N and P will cause eutrophication, eutrophication in freshwater ecosystems is called "blooms", and eutrophication in marine ecosystems is called "red tides".

The lack of N in the animal body is actually a lack of amino acids, which will affect the growth and development of the animal body.

P:P is an essential element that makes up phospholipids, nucleic acids, and ATP. The lack of P in plants will affect the replication of DNA and the transcription of RNA, thus affecting the growth and development of plants.

P is also involved in the energy transfer process in photosynthesis and respiration in plants, as both ATP and ADP contain phosphoric acid. P is also an element that is prone to eutrophication of aquatic ecosystems. When the plant lacks p, the old leaves tend to appear dark green or purple-red stems and leaves, and the growth period is delayed.

Auxin promotes the development of plants.

n fertilizer promotes the growth of leaf stems. p can elongate pollen tubes. Auxin analogues promote cell elongation.

It should be seen what factors can also be played, such as selenium, or the temperature and humidity are not suitable, measures to spray selenium fertilizer water to control temperature and humidity.

Lateral transport refers to the transport of auxin from one side of the stem (light source) to the other side (backlight).

The resulting uneven distribution of auxin is actually related to the charge distribution. Auxin is weakly acidic, often in the form of anion in cells, for plants, unidirectional light will cause different parts of the tip of the organ to produce potential difference, negative charge to the light side, backlight side with positive charge, in this way, auxin with weak acidic anion will move to the positively charged backlight side, and then transport downward, thus causing the backlight side under the tip of the auxin distribution more, the longitudinal elongation of the cell is fast, the light side is less distributed, the longitudinal elongation of the cell is slow, so that the plant bends to the light source to grow. When unilateral light irradiates the tip of the coleoplast, there is a certain degree of lateral transport from the light-facing side to the back-lit side at the tip.

The transport of ions is therefore active transport.

The concentration of auxin in the plant is very low, much lower than the concentration of cell fluid, so it needs to consume energy from low to high concentration, which is active transportation.

Yes, lateral transport is the transport of auxin from the light-facing side to the backlight side. Its mode of transport is active transport (carrier and ATP required).

No. Lateral transport is also transported along the concentration gradient. For example, if you are a large-leaved boxwood, only by constantly cutting off the tops of the side branches can it grow thickly.

Answer: Auxin B is dual, high concentrations of auxin will inhibit the growth of plants, so option B is wrong.

a. In a certain concentration range, the promoting effect is enhanced with the increase of auxin concentration, and when it is higher than the optimal concentration, the promoting effect weakens with the increase of auxin concentration, and a is wrong;

b. The developing seeds produce auxin to promote the development of the ovary and bear fruit, b is correct;

c. The physiological mask of auxin cultivation is only dual, low concentration promotion, high concentration inhibition, C correct;

D. Low concentrations of auxin can be placed in the fall of flowers and fruits, D is correct, so choose: Zhichen BCD

When acting on different organs, the growth of the sedan chair is the optimal concentration to promote the growth of the hand is the same.

1. D. Auxin abnormalities lead to flower abnormalities, and it can be seen that auxin is indeed related to the development of flowers, so A and B are paired;

The results resulting from both methods are the same, so it is known that the p gene and auxin polar transport are related to the c pair.

Auxin can not cause genetic mutations, known, d wrong.

3. B tryptophan is catalyzed by enzymes to indole acetic acid, which can be seen to be not a protein (if the protein is a ribosome, it must go through ribosomes), so C is wrong.

A unknown. B amino acids all contain at least one amino group and one carboxyl group.

The more reactants, the faster the reaction rate, rather than inhibiting its synthesis.

The c,p gene is involved in auxin polar transport.

a, indoleacetic acid can be synthesized in large quantities in the germ sheath.

1) The effect of agar punch on the growth and bending of the germ segis sheath has not been ruled out.

2) The effect of promoting growth is weakened.