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Leni [432]
2 years ago
9

Pls help me help me ​

Biology
2 answers:
Zolol [24]2 years ago
5 0

Answer:

Task card 25= B, sleet

Task Card 26= B, gasses

Task Card 27= A, Stratus

Task Card 28= B, warmer

eimsori [14]2 years ago
3 0

25: B

26: B

27: A

28:B

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You have learned that the fusion of egg and sperm produces a zygote. But how does the sperm reach the egg, and how does the zygo
FrozenT [24]

Answer:

Pollen grain lands on stigma

Explanation:

A) Pollen grain lands on stigma

  • pollen tube grows down the style
  • generative cell divides, forming two sperm
  • two sperm are discharged to them female gametophyte
  • sperm fuse with the egg and two polar nuclei
  • zygote forms and divides into a terminal cell and a basal cell
  • cells of embryo differentiate into three tissue types---- seed dries out and becomes dormant.

B)

  1. During pollination, a pollen grain is transferred from an anther to a stigma. Once the pollen grain lands on a suitable stigma, it germinates and forms a pollen tube, a structure that grows down through the style to the ovary.
  2. Once in the pollen tube, the generative cell from the pollen grain divides by mitosis, forming two sperm. The sperm travel down the pollen tube and are discharged into the female gametophyte. In a process called double fertilization, one sperm fertilizes the egg, forming the zygote; the other sperm fuses with two polar nuclei in the female gametophyte, forming a triploid (3n) nucleus. The zygote develops into the plant embryo, and the triploid nucleus divides and gives rise to the endosperm. Double fertilization prevents the waste of the plant's resources by ensuring that the nutrient-rich endosperm only develops if the egg is fertilized.
  3. After double fertilization, the ovule starts to develop into a seed containing the plant embryo. As the embryo develops, the three tissue systems are established, and the cotyledons (seed leaves) form. The seeds of many species dry out as they mature. These dry seeds lie dormant until suitable germination conditions occur.

3 0
3 years ago
Why would joint damage be associated with rapid growth and low testosterone levels?
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Answer: Low levels of testosterone has been linked to joint pain and may cause rheumatoid arthritis in the long run. Rapid growth can lead to joint damage as <span>the accelerated bone growth disrupts the supply of blood to the cartilage, causing bone death and regrowth.

Hope this helps!</span>
4 0
3 years ago
Read 2 more answers
The long and complex series of events that occurs when a signal binds to the cell surface and is converted from one form to anot
Lostsunrise [7]
The answer is signal transduction
6 0
3 years ago
What is the right answer
777dan777 [17]

Answer:

B

Explanation:

5 0
3 years ago
Not b so what is it
olasank [31]

Answer: d

Explanation:

7 0
3 years ago
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