Concept explainers
To differentiate: Between pollination and fertilization.
Concept introduction: A flower is the reproductive part of a modified thick shoot of an
To determine: Whether pollination or fertilization process occurs first.
Concept introduction: Flower is a reproductive part of a modified thick shoot of an angiosperm plant. In order to carry out sexual reproduction, the conversion of the shoot apical meristem into floral meristem is required. There involves various parts that make up the structure of a flower.
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- What are the post-fertilization changes that occur in plants?arrow_forwardDuring double fertilization, one sperm will unite with the egg, forming a zygote. As mentioned in the lecture, a generative cell divides to form two sperm. How is the second sperm used during the process of double fertilization? 00 00 It fertilizes the flower by landing directly on the stigma, which is the sticky surface found above a flower's style and ovary. This depends on the type of plant. Land plants will allocate the sperm that is not united with the egg to the formation of different tissues through mitosis and cytokinesis. It forms a triploid cell by fusing with polar nuclei. This cell then divides and develops endosperm tissue. Since it was not the sperm to fuse with the polar nuclei, the sperm cell will degenerate.arrow_forwardSuppose 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.arrow_forward
- Many flowers have both anthers and pistils. What prevents self-pollination and later self-fertilization?arrow_forwardWhat are the post fertilizational changes in the flower?arrow_forwardDescribe how the petals, ovary, and ovule of flowers participate inreproduction. What happens to each part after fertilization?arrow_forward
- in a mung bean, there is an attachment of the funiculus to the ovule. what do you think is the position of the ovule from which this seed is derived?arrow_forwardWhat happens to sepals, petals, and stamens after fertilization? State the fate of zygote, ovule, and ovary in these plants.arrow_forwardWhich of the following events must occur before fertilization can happen? -Double meiosis -seed coat formation -endosperm formation -Pollination -fruit developmentarrow_forward
- What is the purpose of hilum in seeds?arrow_forwardWhat is the difference between self-pollination and cross-pollination? If pollen is transferred from the stamens of a flower to the stigma of the very same flower, is that cross-pollination or self-pollination? If it is transferredfrom the stamen of one flower to the stigma of another flower on the very same plant? If it is transferred from the stamen of one flower to the stigma of another flower on a different plant, but a plant that is a clone of the first one? Animals do not have pollen, of course, but why is it that most animals never have to worry about the equivalent problem of self-fertilization? Why cannot most animals fertilize themselves?arrow_forwardWhat happens to the female parts of the flower after fertilisation? The ovules become seeds and the rest becomes the fruit The ovules become fruit and the rest becomes the seeds The ovules become seeds and the rest becomes the food storearrow_forward
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