lesson 6: plant reproduction
... As the endosperm and the plant embryo develop, the ovule will harden and form a seed coat. Some flowers start out with multiple ovules, so they will end up with multiple seeds. (Our “average” flower picture had only one ovule, so it would make only one seed.) While the ovules are turning into seeds ...
... As the endosperm and the plant embryo develop, the ovule will harden and form a seed coat. Some flowers start out with multiple ovules, so they will end up with multiple seeds. (Our “average” flower picture had only one ovule, so it would make only one seed.) While the ovules are turning into seeds ...
Plants - OnMyCalendar
... An ovulate cone scale has two ovules, each containing a megasporangium. Only one ovule is shown. ...
... An ovulate cone scale has two ovules, each containing a megasporangium. Only one ovule is shown. ...
Origin of angiosperm characters
... hopalostachians. Some early angiospem flowers still retained a little modified anthocorm morphology (Dilcher, 1979). Moreover, distinct interfloral phyllomes were recently found in florets of Palaeocene hamamelid heads (Maslova & Krassilov, in press; Pl. 2, figs 1-3) indicating their primary rather ...
... hopalostachians. Some early angiospem flowers still retained a little modified anthocorm morphology (Dilcher, 1979). Moreover, distinct interfloral phyllomes were recently found in florets of Palaeocene hamamelid heads (Maslova & Krassilov, in press; Pl. 2, figs 1-3) indicating their primary rather ...
Chapter 19 PowerPoint
... Variation in flowers and fruits is the result of millions of years of evolution. ...
... Variation in flowers and fruits is the result of millions of years of evolution. ...
S L (S )
... ovary has a simple apical style. This style is expanded into an umbrella-shaped disk, which is held upside-down in the open flower. The stigmas are under each of the notched lobes at the upward-pointing ends of the style. The downward-hanging petals and the upward-pointing stylar lobes form a curtai ...
... ovary has a simple apical style. This style is expanded into an umbrella-shaped disk, which is held upside-down in the open flower. The stigmas are under each of the notched lobes at the upward-pointing ends of the style. The downward-hanging petals and the upward-pointing stylar lobes form a curtai ...
Clematis ligusticifolia Nutt., WESTERN VIRGIN`S BOWER, OLD
... ca. 2.5 mm long, brown, hairy; beak ca. 40 mm long, rose-purple when immature drying buff. Mid-June−mid-September. Native. Perennial woody climber mostly known from the coastal canyons of SMM. Clematis ligusticifolia is a summer-flowering species that occurs in relatively sparse populations; it typi ...
... ca. 2.5 mm long, brown, hairy; beak ca. 40 mm long, rose-purple when immature drying buff. Mid-June−mid-September. Native. Perennial woody climber mostly known from the coastal canyons of SMM. Clematis ligusticifolia is a summer-flowering species that occurs in relatively sparse populations; it typi ...
3.6.1 Reproduction of the Flowering Plant 2.3.7 Functions of Meiosis
... The carpel is the female part of the flower. The stigma is where the pollen grain lands and is stimulated to germinate. The style connects the stigma to the ovary. The ovary contains one or more ovules. Each ovule makes an embryo sac (megaspore) by meiosis. The embryo sac produces an egg cell and po ...
... The carpel is the female part of the flower. The stigma is where the pollen grain lands and is stimulated to germinate. The style connects the stigma to the ovary. The ovary contains one or more ovules. Each ovule makes an embryo sac (megaspore) by meiosis. The embryo sac produces an egg cell and po ...
Ipomoea carnea Jacq. (Convolvulaceae)
... This is the first report of pollination of I. carnea by anthophorid bees. Austin 11974, in litt.) reports that they are pollinated by bees of the genus Bombus and by the wasp Campsomeris in Florida, by bees of the genus Peponapis and Melissodes bimaeulata nulla in Yucatan. Van der Pijl (1954), descr ...
... This is the first report of pollination of I. carnea by anthophorid bees. Austin 11974, in litt.) reports that they are pollinated by bees of the genus Bombus and by the wasp Campsomeris in Florida, by bees of the genus Peponapis and Melissodes bimaeulata nulla in Yucatan. Van der Pijl (1954), descr ...
View/Open
... Each microsporophylls bears 8 or 9 microsporangia in two rows on its abaxial side Before polen dispersal the cone axis elongate to expose the individual sporangia Sporophylls bears stomata on the lower surface and resin ducts in the distal portion ...
... Each microsporophylls bears 8 or 9 microsporangia in two rows on its abaxial side Before polen dispersal the cone axis elongate to expose the individual sporangia Sporophylls bears stomata on the lower surface and resin ducts in the distal portion ...
Imperfect Flowers
... the female flowers, and they can also cross pollinate with other plants in the vicinity. ...
... the female flowers, and they can also cross pollinate with other plants in the vicinity. ...
Let`s look at flowers
... Looking at flowers 1. Draw your flower and make a note of size and colour. 2. Does it have a scent? (Some people might be able to detect a scent when others cannot. Some scents can be lost after flowers are picked.) 3. Label on the drawing the parts that are visible and how many of them there are. T ...
... Looking at flowers 1. Draw your flower and make a note of size and colour. 2. Does it have a scent? (Some people might be able to detect a scent when others cannot. Some scents can be lost after flowers are picked.) 3. Label on the drawing the parts that are visible and how many of them there are. T ...
Plant Science Topic notes
... These pictures were taken from the same tree at different times of the year. Some of the cones are open and have shed their seeds, while others are still closed with seeds inside them. When these cones dry they open releasing their mature seeds. Angiospermophytes These are the flowering plants and i ...
... These pictures were taken from the same tree at different times of the year. Some of the cones are open and have shed their seeds, while others are still closed with seeds inside them. When these cones dry they open releasing their mature seeds. Angiospermophytes These are the flowering plants and i ...
Broccoli Seed
... Each field grown for broccoli seed is isolated from an adjacent flowering brassica by a distance of 2 miles. Broccoli seed is grown from transplants planted in early fall, seed is harvested the following May. All of the cole crops can be crossed and as many of the flowers cannot be fertilized by the ...
... Each field grown for broccoli seed is isolated from an adjacent flowering brassica by a distance of 2 miles. Broccoli seed is grown from transplants planted in early fall, seed is harvested the following May. All of the cole crops can be crossed and as many of the flowers cannot be fertilized by the ...
The mating game: pollination and fertilization in flowering plants
... proteins (AGPs), abundant in stylar secretions, may provide important directional cues. The Yariv reagent, which binds AGPs, inhibits growth of lily and maize pollen, although a similar effect was not observed in all plants [35]. In Nicotiana tabacum, a transmitting tissue specific glycoprotein, TTS ...
... proteins (AGPs), abundant in stylar secretions, may provide important directional cues. The Yariv reagent, which binds AGPs, inhibits growth of lily and maize pollen, although a similar effect was not observed in all plants [35]. In Nicotiana tabacum, a transmitting tissue specific glycoprotein, TTS ...
page 38 LIFE ON EARTH UNIT TWO SUMMARY UNIT TWO
... further. Conifers often live in areas with long cold winters when water is frozen and cannot be used by the trees. So, adaptations for dry conditions, such as the structure of their leaves, help the conifers survive the winters. Most of the conifers live in regions just south of the Arctic tundra. T ...
... further. Conifers often live in areas with long cold winters when water is frozen and cannot be used by the trees. So, adaptations for dry conditions, such as the structure of their leaves, help the conifers survive the winters. Most of the conifers live in regions just south of the Arctic tundra. T ...
Plant Parts
... • made up of two structures: 1. filament: supports the anther 2. anther: produces pollen • pollen: contains the male sex cells ...
... • made up of two structures: 1. filament: supports the anther 2. anther: produces pollen • pollen: contains the male sex cells ...
Plant Reproduction and Development 621
... The embryo is surrounded by endosperm, enlarged cotyledons, or both. The seed coat is formed from the integuments of the ovule. The arrangement within the seed of a dicot is shown in Figure 34.7a. Below the cotyledon attachment point, the embryonic axis is termed the hypocotyl, which terminate ...
... The embryo is surrounded by endosperm, enlarged cotyledons, or both. The seed coat is formed from the integuments of the ovule. The arrangement within the seed of a dicot is shown in Figure 34.7a. Below the cotyledon attachment point, the embryonic axis is termed the hypocotyl, which terminate ...
Gymnosperms
... tallest living vascular plants. Conifers have their reproductive structures in cones, but they are not the only plants to have that trait ( Figure 1.1). Conifer pollen cones are usually very small, while the seed cones are larger. Pollen contains gametophytes that produce the male gamete of seed pla ...
... tallest living vascular plants. Conifers have their reproductive structures in cones, but they are not the only plants to have that trait ( Figure 1.1). Conifer pollen cones are usually very small, while the seed cones are larger. Pollen contains gametophytes that produce the male gamete of seed pla ...
Diversity in the Plant Kingdom
... (chromosomes). These special cells are called gametes (sperm or egg cells) because they can directly engage in fertilization. Fertilization involves pooling the chromosomes of the egg and the sperm to produce a fertilized egg having once again the normal chromosome content, and thus a normal new ind ...
... (chromosomes). These special cells are called gametes (sperm or egg cells) because they can directly engage in fertilization. Fertilization involves pooling the chromosomes of the egg and the sperm to produce a fertilized egg having once again the normal chromosome content, and thus a normal new ind ...
2007-01 (NRCS)
... northern, interior, southwestern and western Alaska, and produces the most reliable quantity of fruit from year to year. Flowers are mostly solitary in the axils of the needle-like leaves. They are pink or purplish and inconspicuous, often buried near the ground beneath spiking branches. Flowering o ...
... northern, interior, southwestern and western Alaska, and produces the most reliable quantity of fruit from year to year. Flowers are mostly solitary in the axils of the needle-like leaves. They are pink or purplish and inconspicuous, often buried near the ground beneath spiking branches. Flowering o ...
Gymnosperms
... Gymnosperms differ from angiosperms in several significant ways: (1) Seeds are produced "naked" on the surface of modified leaves or cone scales, instead of being enclosed in fruits. (2) No flowers are produced. (3) Only a single male gamete is required for the production of one seed, in contrast to ...
... Gymnosperms differ from angiosperms in several significant ways: (1) Seeds are produced "naked" on the surface of modified leaves or cone scales, instead of being enclosed in fruits. (2) No flowers are produced. (3) Only a single male gamete is required for the production of one seed, in contrast to ...
plants 2014 in class
... • The mother cell divides by meiosis to produce 4 haploid megaspores. • Three of these 4 megaspores disintegrate. • The fourth megaspore undergoes 3 cycles of mitosis to produce the female gametophyte, consisting of 7 cells with a total of 8 haploid nuclei. The central cell contains 2 polar nuclei. ...
... • The mother cell divides by meiosis to produce 4 haploid megaspores. • Three of these 4 megaspores disintegrate. • The fourth megaspore undergoes 3 cycles of mitosis to produce the female gametophyte, consisting of 7 cells with a total of 8 haploid nuclei. The central cell contains 2 polar nuclei. ...
Chapter 21 Most land plants have (but charophyceans do not):
... a flagella without a need for water (microspores develop into the male gametophyte pollen grain, which contains the male gamete sperm) ...
... a flagella without a need for water (microspores develop into the male gametophyte pollen grain, which contains the male gamete sperm) ...
PLANT REPRODUCTION QUESTION 1973:
... __ Details of archegonial structure __ Details of antheridial structure __ Gametophyte is photosynthetic; has rhizoids for anchoring and water absorption FLOWERING PLANT __ Male (micro)gametophyte (or pollen grain is immature microgametophyte) __ Female (mega)gametophyte or embryo sac __ Structure o ...
... __ Details of archegonial structure __ Details of antheridial structure __ Gametophyte is photosynthetic; has rhizoids for anchoring and water absorption FLOWERING PLANT __ Male (micro)gametophyte (or pollen grain is immature microgametophyte) __ Female (mega)gametophyte or embryo sac __ Structure o ...
How Do Organisms Reproduce
... ___________________ attract pollinators to help reproduction occur. The wind or animals transport the ______________ from the _____________________ to the style of the pistil. The pollen then travels down the stigma to reach the ovule in the ___________. When the pollen (male sex cell) and _________ ...
... ___________________ attract pollinators to help reproduction occur. The wind or animals transport the ______________ from the _____________________ to the style of the pistil. The pollen then travels down the stigma to reach the ovule in the ___________. When the pollen (male sex cell) and _________ ...
Pollination
Pollination is a process by which pollen is transferred from the anther to the stigma of the plant, thereby enabling fertilization and reproduction. It is unique to the angiosperms, the flower-bearing plants.In spite of a common perception that pollen grains are gametes, like the sperm cells of animals, this is incorrect; pollination is an event in the alternation of generations. Each pollen grain is a male haploid gametophyte, adapted to being transported to the female gametophyte, where it can effect fertilization by producing the male gamete (or gametes), in the process of double fertilization). A successful angiosperm pollen grain (gametophyte) containing the male gametes is transported to the stigma, where it germinates and its pollen tube grows down the style to the ovary. Its two gametes travel down the tube to where the gametophyte(s) containing the female gametes are held within the carpel. One nucleus fuses with the polar bodies to produce the endosperm tissues, and the other with the ovule to produce the embryo Hence the term: ""double fertilization"".In gymnosperms, the ovule is not contained in a carpel, but exposed on the surface of a dedicated support organ, such as the scale of a cone, so that the penetration of carpel tissue is unnecessary. Details of the process vary according to the division of gymnosperms in question.The receptive part of the carpel is called a stigma in the flowers of angiosperms. The receptive part of the gymnosperm ovule is called the micropyle. Pollination is a necessary step in the reproduction of flowering plants, resulting in the production of offspring that are genetically diverse.The study of pollination brings together many disciplines, such as botany, horticulture, entomology, and ecology. The pollination process as an interaction between flower and pollen vector was first addressed in the 18th century by Christian Konrad Sprengel. It is important in horticulture and agriculture, because fruiting is dependent on fertilization: the result of pollination. The study of pollination by insects is known as anthecology.