)The sporophyte generation produces spores that grow into a A. The male cells in the pollen is carried to the female sex cells and when they fuse they will create a seed which can grow into a new plant. As the rate of embryonic development decreases, the seeds of most angiosperms enter a period of dormancy, accompanied by dehydration and hardening of the integuments, which form seed coats. Label the ovary and ovule on the above diagram. Pollination 4. _______ The egg is released from the ovaries and travels along the oviduct. Many angiosperm species reproduce both asexually and sexually. From the vagina, the sperm travel into the uterus and up into the oviducts and to the egg cell. Close-up of the head of a common sunflower (, Young leaves, male catkins, and (top centre) female flowers of paper birch (. Gravity: Fruit can fall off a tree and roll as far as possible from the parent tree. Plants pollinated by wind do not need to attract insects or animals to pollinate them and thus do not need brightly coloured petals. The process of fertilisation in plants occurs in clearly defined steps: This pollen tube starts to grow from the stigma and down the style. The pistil, most often composed of an enlarged basal ovary, a columnar style, and distal stigma, is the ovule-producing organ of the flower. It is the personal preference of the couple. Angiosperms often have vegetative, asexual reproduction methods. Some species are able to switch between asexual and sexual reproduction, depending on certain conditions, such as whether there is a mate available for sexual reproduction. The position of the floral organs with reference to each other and to the tip of the floral receptacle varies in different flowers; in some, the perianth (sepals and petals) and stamens are attached to the receptacle below the pistil; such flowers are hypogynous (e.g., buttercup and magnolia). Stigma is inside the flower where the pollinator will brush up against it and has a sticky coating that the pollen sticks to. As the seed dries or it is brushed against something else, they fall off. If you are ovulating, it does not matter if it is the first time you have sex, you can still fall pregnant. When you've finished answering as many of the questions as you can, scroll down to the bottom of the page and check your answers by clicking 'Get score'. Height is measured in centimetres (cm) and age is measured in years. It is hoped more colonies will be found in other remote mountain regions. Emphasise that it is not only boys who can carry condoms. Receptacle. Acorns are also hard so that they can last a long time in storage before getting the chance to germinate. Cotyledons that emerge above the soil may wither and drop off as their food is used (e.g., bean), or they may persist and function as photosynthetic leaves (e.g., castor bean). The team is now close to reintroducing these bee larvae into the remaining colony. Pollinators play an extremely important role in the life cycle of flowering plants. Since angiosperms produce a very large amount of the world's food crops, without pollinators, we would be without most of the food crops produced for us to eat. Learners might refer to the brightly coloured petals, strong scent, the specific length of the stigma, stamen, nectar pouch, etc. This is a very good example of natural selection at play. What is the message that is brought across by the title and article? Explain what changes occur inside the ovaries of a girl during puberty and why these changes are important for reproduction. Flowers contain the plantâs reproductive structures. In addition, some may serve as sources of stored food themselves (pea). For plants to survive, they need to reproduce. How could you easily distinguish which plants used pollinators to pollinate them? They attract pollinators, such as insects and birds and also bats and mice. Why do you think these growth spurts took place when they did? In most angiosperms, the flowers are perfect: each has both microsporangia and megasporangia. "It's a long shot but one we hope will bear fruits" commented Dr Wimple. In conifers such as pines, the green leafy part of the plant is the sporophyte, and the cones contain the male and female gametophytes (see the figure below). Some organisms like corals and komodo dragons can reproduce either sexually or asexually. A timeline shows us a representation of how time passes and the events which take place. Do you remember that the pollen grains contain the male sex cells, and the ovary contains the ovules or female sex cells. The child will have half its genetic material (DNA) from its mother and half from its father. It may be divided into different parts (or locules) and produces the ovules that contain the female reproductive sex cells. 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