Do plants still grow without plant hormones

Can not grow normally, hormones are a class of substances that play a role in regulating the growth and development and physiological functions of animals and plants, if not, it is like human lack of urgency, such as human lack of growth hormone, it becomes cretinism, plant lack of hormones will also make plants grow abnormally, and other plant hormones can not support plant growth.

Yes, with more hormones, it is not very good for the plant itself. Just like us, we need to grow naturally.

Yes, but it's slow, but it's healthy.

No, hormones regulate physiological functions. If you don't have it, you can't grow.

It should be said that there is a distinction between external and internal regulation. The regulation of internal factors includes hormone regulation and secondary metabolite regulation, and external regulation includes photoperiod regulation, photoinduction, etc.

a. Plant hormones.

It will also be inactivated after it has played a role, and it cannot be used repeatedly, a error;

b. Plants cannot secrete sex hormones.

God is false and erected;

c. The essence of animal and plant hormones is different, and their recognition receptors are different, and plant hormones only act on plants, C is correct;

d. Auxin.

and other plant hormones can not be absorbed in the animal body and are excreted with the urine swimming, d is correct Therefore, CD is chosen

Flowers and plants that have been kept in the house for a long time will grow towards the place where there is light, small seedlings will bend towards the light, and sunflowers will turn their flower disks with the sun, these are all the magic of auxin. If you look closely at a tree, you will see that the canopy is small and large, most typically the conical canopy of cedar and juniper, which is responsible for this phenomenon. The auxin produced by the apical bud inhibits the growth of the lateral branches, and the farther away from the apex, the less inhibiting the effect, so the highest part of the crown is sharper, the closer to the ground the wider it is, and the more vigorous the lateral branches grow.

The top buds of cotton are removed, so that the side buds can be fully developed, there are more flowers, and there are more cotton peaches, and the yield is of course increased. The hedges planted during landscaping often have to be pruned, and every time they are cut, part of the top buds are removed, and the inhibition of the growth of side branches by the production hormone is removed, and the side branches grow fast and well, and the hedges become thicker and thicker, which is very beautiful.

Auxin also promotes fruit enlargement. If the pistil does not receive pollen to complete fertilization, it will generally not produce seeds and fruits. But people use auxin to make it fruitful

The unpollinated tomato buds are soaked in auxin, and after a while, seedless tomatoes can be eaten.

The chemical essence of plant hormones is the trace substances synthesized in plants that have an important regulatory effect on plant growth and development, and are generally small molecule compounds.

The chemical nature of auxin is IAA (indoleacetic acid).

Auxin is a type of plant hormone.

Usually when you are asked to judge, you will put these two curves in a graph.

Since plant roots are more sensitive to auxin than plant stems, a certain concentration may be low in stems (promoting) and high in roots (inhibition). In the image, there is a phase difference between the image of the root and the image of the stem, that is, the root in the front of the image and the stem in the back.

Hope mine can be helpful to you.

Exams like this are all like this: put a plant horizontally on the ground, determine which end grows downwards and which grows up, the root is down, the stem is up, the reason is that the plant is stored underneath by gravity, because the optimal concentration of the root is low, so the root is inhibited, so it grows downward, and in the same way, the stem grows upward.

Lateral transport is carried out at the tip of the coleoplast. However, the tip of the coleoplasty has been removed, and the remaining phloem can only be transported polarly (that is, it can only be transported from top to bottom). ）