Biological questions about changes in total organic matter dry weight during early development

1. The difference between monocots and dicots is that the main structure of monocots planting and storage materials is endosperm, while dicots are two ** leaves, and the endosperm of dicots is generally degraded. In the process of seed development, the variety of organic matter in monocotyledon embryo and endosperm will increase because various biochemical reactions are constantly underway, but because photosynthesis has not yet been carried out, organic matter is only consumed, so the total amount of organic matter decreases. The organic matter change of the dicotyledon embryo is the same as that of monocotyledons, while for the endosperm, if it is degenerated, there is no change at all, and if it is not degenerated, it is the same as monocotyledons.

2. The fertilized egg of viviparous animals does not have no material before implantation, and the development of the zygote consumes organic matter, so the total amount of organic matter will decrease, but the variety will increase. After implantation, the mother provides nutrients for the fertilized egg, and the zygote matures and develops into an embryo, at which time the total amount of organic matter increases with the development of the embryo. So generally we say that with the development of the embryo, the total amount of organic matter and the number of species increase.

The development of oviparous embryos depends on protein to provide nutrients, so from the beginning of fertilization, the total amount of organic matter in the development of embryos increases. However, the total amount of organic matter in the protein is reduced. It should be noted here that the egg whites do not belong to the embryo of the oviparous animal.

The yolk here is not the yolk we see, it is a part of the embryonic cell, and the total amount of organic matter in the yolk will also increase with the development of the embryo.

Both plants and animals always rely on the decomposition of their own organic matter to obtain the energy needed for development when they begin to develop from the fertilized egg, so the total amount of organic matter decreases, but the variety increases.

1.The total dry mass is reduced. Because cellular respiration consumes energy, the dry mass must decrease. Although the dry mass decreased, the variety and complexity of organic matter increased.

2。Viviparous animals are divided into whether or not they are implanted (whether the fertilized egg is in contact with the uterine wall), and after implantation for a period of time, the mother's nutrients can enter the fertilized egg, and the dry weight will increase. Before implantation, respiration consumes energy and the dry weight decreases.

All the nutrients of oviparous animals are in the egg, and the total dry weight of the egg is reduced. But the yolk is the cell, and the egg yolk is equivalent to the warehouse, and the yolk absorbs nutrients from the egg white. So the yolk dry weight increases.

The total amount of organic matter accumulation refers to the organic matter produced by plants through photosynthesis during the experiment minus the organic matter consumed by respiration, and the remaining amount is the amount of accumulation. Whereas, dry weight is the total amount of organic matter contained in this plant. In the range of 30%-50% shading, it can be seen from ** that the net photosynthetic rate is greater than zero, it can be seen that the photosynthetic rate of plants is greater than the respiration rate, the organic matter produced by plants is greater than the organic matter consumed, and the dry weight of plants is increasing, which is increased compared with natural selection before the experiment.

Untie; Element A and O are the elements with the most content in the fresh weight of the cells in the stuffy number, not the elements with the most content in the dry weight, A is wrong;

Elements B and O are the most abundant elements in the fresh weight of cells, not the most abundant elements in dry weight, and H2O is a non-organic matter, not an organic matter, and B is wrong;

c. The element with the most content in the dry weight of human cells is C, and the organic matter with the most content in the dry weight of human cells is protein, which is correct;

D, H2O is inorganic, not organic, D is wrong, so choose: C

Untie; Elements A and O are the most abundant elements in the fresh weight of the cell, not the most abundant elements in the dry weight, a is wrong; Element B and O are the most abundant elements in the fresh weight of the cell, not the most abundant element in the dry weight, H2O is inorganic, not organic, B is wrong; c. The element with the most content in the dry weight of human cells is C, and the organic matter with the most content in the dry weight of human cells is protein, which is correct; D, H2O is inorganic, not organic, D is wrong, so choose: C