A few biology questions sophomore A few high school biology questions

A part of the vegetative organs (roots, stems, leaves) of a higher plant that, after detaching from the mother, is able to develop into a new individual. This type of asexual reproduction is known as vegetative reproduction. (Note "Higher Plants").

The description of option ABCD is all correct, but only A is an essential feature.

Asexual reproduction is a way of reproduction in which a new individual is directly produced by the mother without the union of germ cells.

Spore reproduction in asexual reproduction produces germ cells, so option A is correct (budding reproduction is the process of budding from the mother to produce a bud body, and then separate from the parent to develop into a new individual; or the reproductive mode of forming a group without separating from the parents. For example, hydroids and other coelenterates. Bud reproduction does not produce germ cells).

Addendum: Because not all asexual reproduction does not produce germ cells, as mentioned above, spore reproduction in asexual reproduction produces germ cells, so the statement of option b is incorrect.

Vegetative reproduction distinguishes the concepts of vegetative reproduction from budding reproduction.

Essential characteristics. Such as asexual spore spore reproduction.

Bud reproduction does not produce germ cells, and the mother can directly produce new individuals that meet the definition of asexual reproduction.

Vegetative reproduction is for sure. Budding reproduction is only hydra and yeast.

1. Unconditioned reflexes are naturally produced by the evolution of the organism and do not require the participation of the cerebral cortex.

2. After normal people go to the cold environment, the pores shrink, the evaporation of water decreases, and the water in the body increases, so the water in the body is appropriately reduced by reducing the secretion of antidiuretic hormone. The enzyme activity is basically unchanged. However, the activity of respiratory enzymes increases, because the respiration of the body's cells is enhanced after the cold environment, so the activity of the enzymes is increased.

3. The principle of fertilization is to increase the content of mineral elements in the soil. Reasonable dense planting is to increase the full use of sunlight by the plant body.

4. The direct value can be seen, while the indirect value is not known or unclear now, and it needs to be studied to know.

5. Kind of method.

6. It can act on hormone-secreting cells or glands, such as thyroid hormones. Thyroid hormones act on almost all posters, mainly due to negative feedback regulation on pituitary cells.

7. Hierarchical regulation means that the hypothalamus secretes hormones to act on the pituitary gland, and the pituitary gland secretes hormones to act on the back glands. In this way, it works from level to level. Only humoral regulation, no neuromodulation.

1.Unconditioned reflexes are innate, uncultivated.

Increase the composition of various inorganic salts. For example, potassium ions or something. The purpose of proper dense planting is to reduce the amount of organic matter consumed by respiration. The principle seems to be that by increasing the carbon dioxide concentration appropriately, it can be reduced.

4.Indirect should be the impact on the environment.

5.I just remember how to count. The number of the first catch * the number of the second catch The number of marks = the total.

6.The last question is both.

1.Yes 2No change.

3.It is to prevent the carbon dioxide concentration from becoming too high.

Sampling, marker refill.

7.Neuromodulation is the mainstay, supplemented by humoral modulation.