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Some pollen grains will not germinate in vitro. They will germinate only on compatible stigma. Why?
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- Pollen grains are derived from a microsporocyte, developed inside the microsporangia of an anther, and are supposed to contain 2 sperm cells and a tube nucleus. O True FalseThere are two locations in which the gynoecium interacts chemically with the pollen and pollen tube and can either allow the pollen tube to grow or prevent it from growing. What are these two locations? O Style and megagametophyte Stigma and ovule Stigma and style Stigma and megagametophyte Style and ovuleTrue or false. 1.) The ovary becomes the seed when matures 2.) Pollination is the transfer of pollen grains from the stamen to the stigma 3.) Double fertilization in plants produces two zygotes. 4.) The anther contains the female sex cells of the plants. 5.) Epigeal germination occurs when the cotyledon remains below the ground.
- In flowers, the structures that produce male gametophytes are called _______ ;the strcutures that produce female gametophytes are called _______ . a. pollen grains; flowers c. anthers; stigma b. stamen; carpels d. megaspores; microsporesFigure 32.3 If the anther is missing, what type of reproductive structure will the flower be unable to produce? What term is used to describe a flower that is normally lacking the androecium? What term describes a flower lacking a gynoecium?At the time of entering into ovule, pollen tube has:a) three male nucleib) two mole nucleic) one gamete nucleusd) four male gametes
- Suppose that 100 pollen grains land on a stigma, and 50 mature seeds are formed in the fruit. What does this indicate about the pollination process and success? A) 100% success: 100 pollen grains grew to 50 ovules, two to each, and double fertilization occurred. B) 100% success: Only 50% of the pollen grains germinated, but each produced 2 sperms to complete double fertilization in 50 seeds. C) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 50 polar nuclei. D) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 100 polar nuclei. correct answer and explanation why please.We used seedlings of Lepidium sativum to see under which conditions it would germinate in an experiment. We'd use cotton wool and dampen it, and placing the seedlings at the bottom. Depending on which bottle it was, some were mixed with dampened cotton wool, and others didn't have cotton wool that were dampened. Then the opening of the bottle was covered, except for one which was covered with a lid. (See the picture). Now, I have to explain my results in my lab report. I can't find a solid source on what factors that cause the germination of seedlings. I've covered cellular respiration, and photosynthesis, but I don't know how to proceed from here. Bear also in mind that there's no soil in which the seed is germinating, so I will have to be able to explain this. Second of all, could you clue me in on how moisture is important for the germination of seedlings? Should I also bring up the physiology of seedlings and how they're growing?I found a few black walnut and I want to bonsai them. They are still covered in the green fleshy "fruit" part. How do I remove this fruit? Lastly, how should I germinate them?