-
Anonymous users2024-02-08Select C. When using the principle of auxin to breed seedless tomatoes, greater than or equal to E according to the diagram cannot promote growth. A false.
In the phototropism experiment of the stem, if the auxin concentration on the phototropic side of the stem is measured to be the concentration at point b, then the concentration of the backlight-side is set between BCD, and is not equal to b,d, otherwise it will not show the phenomenon of bending to the light source. B false. If point C indicates the auxin concentration of the apical bud of a plant, according to the principle of apical dominance of the plant, the auxin concentration of the lateral bud should be inhibited and should be greater than the E point.
D false. If point c indicates the most suitable concentration to promote stem growth, points A and D cannot represent the most suitable concentration to promote root and shoot growth, because the optimal concentration of roots, shoots, and stems is the power of 10 to the minus tenth, the power of 10 to the power of minus eighth, and the power of 10 to the power of the minus four, respectively.
-
Anonymous users2024-02-07Concentrations below point C are calcium concentrations that promote growth.
According to the diagram of the effects of hormones on rhizomes and leaves in the biology book, roots are more sensitive to hormones than stems, so use low concentrations, while buds are not sensitive to stems, so use high concentrations.
-
Anonymous users2024-02-06The cultivation of seedless tomatoes uses the principle of auxin to promote the development of the ovary, so the effect of auxin should be shown to promote, so the concentration should be less than the e point, and the optimal concentration of the root is less than the bud and the stem, so d is wrong. In A, the backlight is greater than that on the light-oriented side, and in B, according to the principle of apical dominance of the plant, the concentration of auxin in the side buds should be inhibited, so AB is wrong.
-
Anonymous users2024-02-05Much is what is natural and what is chemically synthetic.
-
Anonymous users2024-02-04What elements do plants need to grow?
-
Anonymous users2024-02-03The geotropism and backsoil of plant growth are the embodiment of the duality of auxin, why is this sentence wrong, ask for an answer.
Answer: The geotropism of plant root growth reflects the promotion of low concentration and high concentration inhibition, and reflects the duality of auxin. However, the back growth of the stem only has a promoting effect and no inhibitory effect, so it does not reflect the duality of auxin's effect.
Why is seedless watermelon a heritable variant and seedless tomato not?
Answer: Seedless watermelon is a mutation caused by a change in the chromosome, which is a change in genetic material, so it is a heritable variation, while a seedless tomato is a mutation caused by a change in external conditions (treating the infertile ovary with auxin to develop into a seedless fruit), so this variation cannot be passed on to the next generation, and it is a non-heritable variation.
-
Anonymous users2024-02-02The root is to the ground, and the stem is to the back. The appropriate concentration of auxin can promote plant growth, but too high a concentration will inhibit growth, which is duality. In the definition, only the stem is compliant, and the ground orientation of the root is the manifestation of inhibition.
Seedless watermelons are polyploid hybrids, and seedless tomatoes are sprinkled directly with auxin, you say. If it helps, please adopt.
-
Anonymous users2024-02-01The orientation of the roots and the backing of the stems.
Tomatoes are directly coated with ethylene to ripen, and seedless watermelons are multi-fold sports varieties [I'm typing too slowly, the time is almost up, if there is anything I don't understand, I will definitely explain it to you].
Dizzy, buy a reference book.
First, the dominant recessive nature of albinism and sickle anemia was determined, and according to the left half of Figure 1, it can be concluded that anemia is a recessive genetic disease, which is bb; Then look at Figure 2, because if it is normal, it can be cut, and if it is not normal, it can't, so B is normal, C is albino, and both are homozygous, only A is heterozygous (because A can cut out three pieces: DNA is a double helix structure, only one of A can be cut, B can be cut all of them, cut into two short and two long, C is not cut) Because albinism is a recessive genetic disease, it is AA, so it can be known that B is AA and C is AA >>>More
p17, the enzyme that catalyzes the hydrolysis of lipase.
Lipase"It is an enzyme, and the enzyme is a protein, so it is natural to use protease. >>>More
In fact, you don't have to be so nervous, you may just put too much pressure on yourself, relax, and the workbook or something wrong is a good thing, learn more lessons, don't miss it again, and the review before the exam is very important, I usually look at the notes, and then see that I am not very familiar with the will be memorized, and then 5.3 wrong questions to see more, but there is no need to do 5.3 in the second year of high school, you can try my method, maybe it will get better.
Lying on two pairs of homologous chromosomes follows the law of free combination, and two pairs of genes on the same chromosome follow the law of gene linkage interchange. >>>More