Lecture 12: Gymnosperms and Angiosperms
... • Heterosporous: forms two different types of spores (micro- and megaspores; male and female spores) • Male – pollen grains contain tube nucleus and generative cell (2 sperm nuclei) • Female – female gametophyte contains egg and 2 polar nuclei ...
... • Heterosporous: forms two different types of spores (micro- and megaspores; male and female spores) • Male – pollen grains contain tube nucleus and generative cell (2 sperm nuclei) • Female – female gametophyte contains egg and 2 polar nuclei ...
Reproduction and Development
... A microspore divides once by mitosis and produces a generative cell and a tube cell – Generative cell will eventually form sperm – Tube cell, enclosing the generative cell, produces the pollen tube; delivers sperm to egg ...
... A microspore divides once by mitosis and produces a generative cell and a tube cell – Generative cell will eventually form sperm – Tube cell, enclosing the generative cell, produces the pollen tube; delivers sperm to egg ...
ch 29 and 30 plant diversity a.p.
... sporangia of the parental sporophyte. This protects the female gametophyte from environmental stresses, such as drought and UV radiation. It also provides the gametophyte with nutrients (See Figure 30.2 page 592 for the evolution of gametophyte/sporophyte relationship) 2. Heterospory: Seed plants ar ...
... sporangia of the parental sporophyte. This protects the female gametophyte from environmental stresses, such as drought and UV radiation. It also provides the gametophyte with nutrients (See Figure 30.2 page 592 for the evolution of gametophyte/sporophyte relationship) 2. Heterospory: Seed plants ar ...
FLOWERS
... Oldest flower fossil is 125 million years old. The dominant forms of plant life were gymnosperms, cycads, and ferns. ...
... Oldest flower fossil is 125 million years old. The dominant forms of plant life were gymnosperms, cycads, and ferns. ...
rotation 1 - School Garden Project
... direction she faces when going down the long middle section shows which direction the flowers are. The more the bee buzzes during the middle part, the farther away the flowers are. In the game one person is the worker bee searching for flowers. Everyone else turns their back and closes their eyes as ...
... direction she faces when going down the long middle section shows which direction the flowers are. The more the bee buzzes during the middle part, the farther away the flowers are. In the game one person is the worker bee searching for flowers. Everyone else turns their back and closes their eyes as ...
A. Overview of Seed Plant Evolution
... animals. They typically lack bright coloration in wind-pollinated plant species. Neither the sepals nor petals are directly involved in reproduction. Stamens, the male reproductive organs, are the sporophylls that produce microspores that will give rise to gametophytes. A stamen consists of ...
... animals. They typically lack bright coloration in wind-pollinated plant species. Neither the sepals nor petals are directly involved in reproduction. Stamens, the male reproductive organs, are the sporophylls that produce microspores that will give rise to gametophytes. A stamen consists of ...
Induced Mutagenesis and Natural Genetic Variation in - Esalq
... produced a 15% reduction in the fertility of M1 plants. Chemical mutagens are extremely toxic and, therefore, require more care in the manipulation of treated material, compared to physical mutagens, which is not residual. The latter can be easily applied to pollen (Liharska et al., 1997) and then ...
... produced a 15% reduction in the fertility of M1 plants. Chemical mutagens are extremely toxic and, therefore, require more care in the manipulation of treated material, compared to physical mutagens, which is not residual. The latter can be easily applied to pollen (Liharska et al., 1997) and then ...
A. Overview of Seed Plant Evolution
... animals. They typically lack bright coloration in wind-pollinated plant species. Neither the sepals nor petals are directly involved in reproduction. Stamens, the male reproductive organs, are the sporophylls that produce microspores that will give rise to gametophytes. A stamen consists of ...
... animals. They typically lack bright coloration in wind-pollinated plant species. Neither the sepals nor petals are directly involved in reproduction. Stamens, the male reproductive organs, are the sporophylls that produce microspores that will give rise to gametophytes. A stamen consists of ...
New evidence of the reproductive organs of Glossopteris based on
... relatively dense clusters of microsporangia. Each pollen sac is filled with bisaccate, striate pollen grains. The sporangial wall consists of small cells containing a black substance, and is diagonally striated in surface view similar to the Arberiella-type microsporangia (Fig. 1b). A third type of ...
... relatively dense clusters of microsporangia. Each pollen sac is filled with bisaccate, striate pollen grains. The sporangial wall consists of small cells containing a black substance, and is diagonally striated in surface view similar to the Arberiella-type microsporangia (Fig. 1b). A third type of ...
Science Form 3 GLA + not Science Form 3 GLA + note e Form 3
... ovaries will stop producing ova when a woman is about 55 years old or when she reaches menopause. The ovum is the largest cell in the female body because it contains dense cytoplasm to provide food to the embryo at the early stage of its development. An ovum that is not fertilised by a sperm can onl ...
... ovaries will stop producing ova when a woman is about 55 years old or when she reaches menopause. The ovum is the largest cell in the female body because it contains dense cytoplasm to provide food to the embryo at the early stage of its development. An ovum that is not fertilised by a sperm can onl ...
Campsis radicans
... • When pollen makes contact with the stigma, a tube called the pollen tube grows down through the style pushing the plant sperm nuclei (there are 2) with it. • Double fertilization occurs; not only is the egg fertilized, but another set of cells is fertilized. – The fertilized egg produces a zygote, ...
... • When pollen makes contact with the stigma, a tube called the pollen tube grows down through the style pushing the plant sperm nuclei (there are 2) with it. • Double fertilization occurs; not only is the egg fertilized, but another set of cells is fertilized. – The fertilized egg produces a zygote, ...
useful indices in plant reproductive ecology
... given number of pollinators, the number of visits to a given plant in an interval will be proportional to the fraction of open flowers in the population which belong to that plant. This index was developed to study the interaction between Yucca and its specialised pollinator. Before one applies it, ...
... given number of pollinators, the number of visits to a given plant in an interval will be proportional to the fraction of open flowers in the population which belong to that plant. This index was developed to study the interaction between Yucca and its specialised pollinator. Before one applies it, ...
Origin of angiosperm characters
... show embryo cap and caruncle. These fruits are assigned to aquatic angiosperms related to Lemnaceae, a fairly advanced monocot family. However, they seem to retain a primitive cupule-like fruit structure and the ovule type common to a number of monocot families as well as for their protognetalean pr ...
... show embryo cap and caruncle. These fruits are assigned to aquatic angiosperms related to Lemnaceae, a fairly advanced monocot family. However, they seem to retain a primitive cupule-like fruit structure and the ovule type common to a number of monocot families as well as for their protognetalean pr ...
Angiosperm Reproduction and Biotechnology
... species are often small, green, and inconspicuous, and they produce neither nectar nor scent. Most temperate trees and grasses are wind-pollinated. The flowers of hazel (Corylus avellana, shown here) and many other temperate, wind-pollinated trees appear in the early spring, when leaves are not prese ...
... species are often small, green, and inconspicuous, and they produce neither nectar nor scent. Most temperate trees and grasses are wind-pollinated. The flowers of hazel (Corylus avellana, shown here) and many other temperate, wind-pollinated trees appear in the early spring, when leaves are not prese ...
Flower numbers, pod production, pollen viability, and pistil function
... et al., 1999, 2006). Yields of kabuli chickpeas are less than desi chickpea under terminal drought and pod abortion by kabuli chickpea is more sensitive to water stress than that of desi chickpea (Leport et al., 2006). While pod abortion in chickpea has previously been studied (Leport et al., 2006), ...
... et al., 1999, 2006). Yields of kabuli chickpeas are less than desi chickpea under terminal drought and pod abortion by kabuli chickpea is more sensitive to water stress than that of desi chickpea (Leport et al., 2006). While pod abortion in chickpea has previously been studied (Leport et al., 2006), ...
22.1 What Is a Plant?
... The gymnosperms are seed plants that bear their seeds directly on the scales of cones. The angiosperms are seed plants that bear their seeds in flowers inside a layer of tissue that protects the seed. In seed plants, the entire male gametophyte is contained in a tiny structure called a pollen gr ...
... The gymnosperms are seed plants that bear their seeds directly on the scales of cones. The angiosperms are seed plants that bear their seeds in flowers inside a layer of tissue that protects the seed. In seed plants, the entire male gametophyte is contained in a tiny structure called a pollen gr ...
Lecture 12: Gymnosperms and Angiosperms
... • Heterosporous: forms two different types of spores (micro- and megaspores; male and female spores) • Male – pollen grains contain tube nucleus and generative cell (2 sperm nuclei) • Female – female gametophyte contains egg and 2 polar nuclei ...
... • Heterosporous: forms two different types of spores (micro- and megaspores; male and female spores) • Male – pollen grains contain tube nucleus and generative cell (2 sperm nuclei) • Female – female gametophyte contains egg and 2 polar nuclei ...
Lecture 12: Gymnosperms and Angiosperms
... • Heterosporous: forms two different types of spores (micro- and megaspores; male and female spores) • Male – pollen grains contain tube nucleus and generative cell (2 sperm nuclei) • Female – female gametophyte contains egg and 2 polar nuclei ...
... • Heterosporous: forms two different types of spores (micro- and megaspores; male and female spores) • Male – pollen grains contain tube nucleus and generative cell (2 sperm nuclei) • Female – female gametophyte contains egg and 2 polar nuclei ...
MELITTOPHILY AND MALACOPHILY IN Ipomoea pes-caprae
... observed for their foraging behavior such as mode of approach, landing, probing behaviour, the type of forage they collected, and how they contacted essential organs for pollination. These insects were captured from the flowers during 10:00–12:00 h on five different days for pollen analysis in the l ...
... observed for their foraging behavior such as mode of approach, landing, probing behaviour, the type of forage they collected, and how they contacted essential organs for pollination. These insects were captured from the flowers during 10:00–12:00 h on five different days for pollen analysis in the l ...
Plant Diversity II - The Evolution of Seed Plants
... mature flower on a sporophyte plant and culminates in a germinating seed. 1. Anthers contain microsporangia, containing microspore mother cells that produce microspores by meiosis. 2. Microspores form pollen grains, which are immature male gametophytes. 3. In the ovule, the megaspore mother cell pro ...
... mature flower on a sporophyte plant and culminates in a germinating seed. 1. Anthers contain microsporangia, containing microspore mother cells that produce microspores by meiosis. 2. Microspores form pollen grains, which are immature male gametophytes. 3. In the ovule, the megaspore mother cell pro ...
Chapter 30 Notes
... mature flower on a sporophyte plant and culminates in a germinating seed. 1. Anthers contain microsporangia, containing microspore mother cells that produce microspores by meiosis. 2. Microspores form pollen grains, which are immature male gametophytes. 3. In the ovule, the megaspore mother cell pro ...
... mature flower on a sporophyte plant and culminates in a germinating seed. 1. Anthers contain microsporangia, containing microspore mother cells that produce microspores by meiosis. 2. Microspores form pollen grains, which are immature male gametophytes. 3. In the ovule, the megaspore mother cell pro ...
botany 306 - Department of Ecology, Evolution, and Organismal
... A) Example of independent evolution: Many possible answers, including: wind pollination in families such as the Juncaceae or Cyperaceae and Poaceae or between these and Ranunculaceae, Sapindaceae, Salicaceae and others; latex in Nymphaeaceae and Euphorbiaceae; spikelets in Cyperaceae and Poaceae. B) ...
... A) Example of independent evolution: Many possible answers, including: wind pollination in families such as the Juncaceae or Cyperaceae and Poaceae or between these and Ranunculaceae, Sapindaceae, Salicaceae and others; latex in Nymphaeaceae and Euphorbiaceae; spikelets in Cyperaceae and Poaceae. B) ...
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 ...
Pollen
Pollen is a fine to coarse powder containing the microgametophytes of seed plants, which produce the male gametes (sperm cells). Pollen grains have a hard coat made of sporopollenin that protects the gametophytes during the process of their movement from the stamens to the pistil of flowering plants or from the male cone to the female cone of coniferous plants. If pollen lands on a compatible pistil or female cone, it germinates, producing a pollen tube that transfers the sperm to the ovule containing the female gametophyte. Individual pollen grains are small enough to require magnification to see detail. The study of pollen is called palynology and is highly useful in paleoecology, paleontology, archaeology, and forensics.Pollen in plants is used for transferring haploid male genetic material from the anther of a single flower to the stigma of another in cross-pollination. In a case of self-pollination, this process takes place from the anther of a flower to the stigma of the same flower.