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- The receptive tip of the carpel, which receives pollen at pollination and on which the pollen grain germinates. The stigma is adapted to catch and trap pollen, either by combing pollen off visiting insects or by various hairs, flaps, or sculpturings.
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A hermaphrodite is an organism with both male and female genitalia. In sexually reproducing organisms, males have organs that produce male gametes, usually sperm. Females have different sexual organs that produce female gametes, usually called eggs. In sexually dimorphic organisms, each organism only has type of reproductive organs, and the populat...
In sexually dimorphic organisms, a hermaphrodite may arise because of variations in the genetic code. In humans, hermaphrodites are caused by a variety of genetic conditions. In one form, a hermaphrodite or intersex person is created when two fertilized eggs fuse together, giving the zygote two X chromosomes and one Y chromosome. Other cases of her...
Clownfish
In clownfish society, the only two individuals that get to breed are the two largest individuals. Although all clownfish are born with non-functioning genitals, the largest clownfish undergoes a change when it becomes the largest fish, and ovaries develop and start releasing eggs. This female needs a male to reproduce with, and the second largest fish develops testis that produce sperm. The couple continues to reproduce until one of them dies, in which case they are replaced by the next large...
Earthworms
A hermaphrodite that can be found in your own backyard is the earthworm. Earthworms spend their days deep beneath the soil, burrowing in random directions and aerating the soil. Two earthworms could be only a short distance apart, and never come into contact. Because of this isolated lifestyle, it is important for the worms to be able to reproduce successfully when they meet. The earthworms are hermaphrodites and have both male and female genitalia. When they copulate, both organism give a ga...
Flowers
Some plants are hermaphrodites. In their reproductive organs, flowers, there are both male and female reproductive systems. The pollen, or male gamete is released from a stamen. The female part, the stigmata, is a long tube that leads to ovules containing eggs. The pollen must make its way from the stamen to the stigma. Sometimes this happens on the same plant, and sometimes bees and other pollinating insects carry the pollen from one plant to other. Much like the earthworm, plants benefit fr...
Sexual Dimorphism– When a species has two distinct types, or genders, that only produce on type of genitalia.Gametes– Celled produced by organisms that can fuse together, creating a new organism.Genitalia– The organs used by organisms to copulate, leading to fertilization of an egg.Copulation– The cooperative act two organisms engage in to fertilize an egg.1. Tunicates are organisms that live in the ocean. They are sedentary filter feeder that resemble a pulsing sac. When tunicates reproduce, each organism releases sperm into the environment. Each tunicate can also receive sperm from the environment to fertilize their eggs. The fertilized eggs are released into the ocean, where the zygote finds a spo...
STIGMATA definition: 1. marks that appear on a person's body in the same places as those made on Jesus' body when he was…. Learn more.
STIGMATA meaning: 1. marks that appear on a person's body in the same places as those made on Jesus' body when he was…. Learn more.
Dec 24, 2021 · Stigma is a part of the female reproductive structure of the flower. It comprises the pistil, a part of the gynoecium or female reproductive organ of a plant, together with two other structures, the style, and ovary. Stigma is a specially adapted portion of the pistil modified for pollen reception. Stigma Flower.
Oct 17, 2024 · 1 The glandular sticky surface at the tip of a carpel of a flower, which receives the pollen. In insect-pollinated plants the stigmas are held within the flower, whereas in wind-pollinated species they hang outside it. 2 See eyespot. From: stigma in A Dictionary of Biology ».
stigma. 1. The receptive tip of the carpel, which receives pollen at pollination and on which the pollen grain germinates. The stigma is adapted to catch and trap pollen, either by combing pollen off visiting insects or by various hairs, flaps, or sculpturings.
