Lab Packet II
... pores) for the exchange of gases, and a protective layer of cutin which forms a cuticle. These characteristics allow vascular plants to get large in size. Vascular plants also begin to remove themselves from moist environments because they need less or no water for reproduction. In ferns, a single s ...
... pores) for the exchange of gases, and a protective layer of cutin which forms a cuticle. These characteristics allow vascular plants to get large in size. Vascular plants also begin to remove themselves from moist environments because they need less or no water for reproduction. In ferns, a single s ...
Palaeobotanical redux: revisiting the age of the angiosperms
... angiosperm-like pollen is extremely rare in pre-Barremian strata5,36–41 and that samples from the earliest Early Cretaceous (Berriasian) are devoid of pollen grains that can be assigned plausibly to angio sperms. All of the angiosperm-like pollen grains reported from the Valanginian–Hauterivian are ...
... angiosperm-like pollen is extremely rare in pre-Barremian strata5,36–41 and that samples from the earliest Early Cretaceous (Berriasian) are devoid of pollen grains that can be assigned plausibly to angio sperms. All of the angiosperm-like pollen grains reported from the Valanginian–Hauterivian are ...
- PlantingScience
... contains a discrete trait that is easy to identify and thus easy to trace from generation to generation. The trait is the presence or absence of a purple pigment called anthocyanin ...
... contains a discrete trait that is easy to identify and thus easy to trace from generation to generation. The trait is the presence or absence of a purple pigment called anthocyanin ...
Intro to Plants
... promote seed dispersal. – The angiosperms produce many different types of fruits, which develop from parts of flowers. – Many fruits are eaten by animals and pass undigested from the animals’ bodies. – Other fruits have structures that help them float on wind or water. – Some fruits even forcefully ...
... promote seed dispersal. – The angiosperms produce many different types of fruits, which develop from parts of flowers. – Many fruits are eaten by animals and pass undigested from the animals’ bodies. – Other fruits have structures that help them float on wind or water. – Some fruits even forcefully ...
Biology: Concepts and Connections, 6e (Campbell)
... A) Diploid sporophytes that produce spores by meiosis alternate with haploid gametophytes that produce gametes by mitosis. B) Diploid sporophytes that produce gametes by meiosis alternate with haploid sporophytes that produce gametes by mitosis. C) Diploid gametophytes that produce gametes by meiosi ...
... A) Diploid sporophytes that produce spores by meiosis alternate with haploid gametophytes that produce gametes by mitosis. B) Diploid sporophytes that produce gametes by meiosis alternate with haploid sporophytes that produce gametes by mitosis. C) Diploid gametophytes that produce gametes by meiosi ...
New evidence of the reproductive organs of Glossopteris based on
... wide (Fig. 1c). The main axis at the base of the fertile shoot contains tracheids with scalariform thickenings (Fig. 1e). The fertile leaves are appressed to the main shoot, have a wide basal lamina, and lack a prominent petiole. A pair of slender stalks, each vascularized with scalariform tracheids ...
... wide (Fig. 1c). The main axis at the base of the fertile shoot contains tracheids with scalariform thickenings (Fig. 1e). The fertile leaves are appressed to the main shoot, have a wide basal lamina, and lack a prominent petiole. A pair of slender stalks, each vascularized with scalariform tracheids ...
Lab 5 - SDSU College of Sciences
... subtended by a bract. The bracts are generally small but can get large, e.g., in Pseudotsuga (DOUGLAS-FIR). Each ovuliferous scale bears two ovules (which, of course, develop into two seeds) on its adaxial surface. Ovuliferous scales evolved from much more elaborate lateral branch systems, which bec ...
... subtended by a bract. The bracts are generally small but can get large, e.g., in Pseudotsuga (DOUGLAS-FIR). Each ovuliferous scale bears two ovules (which, of course, develop into two seeds) on its adaxial surface. Ovuliferous scales evolved from much more elaborate lateral branch systems, which bec ...
Plant Growth, Reproduction, and Response
... MAIN IDEAS Plant life cycles alternate between producing spores and gametes. Life cycle phases look different among various plant groups. ...
... MAIN IDEAS Plant life cycles alternate between producing spores and gametes. Life cycle phases look different among various plant groups. ...
19 REPRODUCTION IN PLANTS MODULE - 3
... spores. They are microscopic and covered by a protective wall. When they reach the suitable environment they develop into a new plant body e.g. in bread moulds, moss, fern. In higher plants like pea, maize and gymnosperms, asexual reproduction is always heterosporous. Here, spores are produced after ...
... spores. They are microscopic and covered by a protective wall. When they reach the suitable environment they develop into a new plant body e.g. in bread moulds, moss, fern. In higher plants like pea, maize and gymnosperms, asexual reproduction is always heterosporous. Here, spores are produced after ...
Plants - brittany
... Asexual Plant Reproduction Do you like to eat oranges and grapes that have seeds, or do you like seedless fruit? If these plants do not produce seeds, how do growers get new plants? Growers can produce new plants by asexual reproduction because many plant cells have the ability to grow into a variet ...
... Asexual Plant Reproduction Do you like to eat oranges and grapes that have seeds, or do you like seedless fruit? If these plants do not produce seeds, how do growers get new plants? Growers can produce new plants by asexual reproduction because many plant cells have the ability to grow into a variet ...
Bryophytes - OpenStax CNX
... More than 10,000 species of mosses have been catalogued. Their habitats vary from the tundra, where they are the main vegetation, to the understory of tropical forests. In the tundra, the mosses' shallow rhizoids allow them to fasten to a substrate without penetrating the frozen soil. Mosses slow do ...
... More than 10,000 species of mosses have been catalogued. Their habitats vary from the tundra, where they are the main vegetation, to the understory of tropical forests. In the tundra, the mosses' shallow rhizoids allow them to fasten to a substrate without penetrating the frozen soil. Mosses slow do ...
THE FLOWER - Millennium Organization
... pits termed germ pores, through one of which the pollen tube protrudes. b- Germinal furrows which are grooves in the exine or narrow lanceolate thin areas are of common occurrence.They serve to accommodate the expansion and shrinkage of the pollen grain due to change in humidity. ...
... pits termed germ pores, through one of which the pollen tube protrudes. b- Germinal furrows which are grooves in the exine or narrow lanceolate thin areas are of common occurrence.They serve to accommodate the expansion and shrinkage of the pollen grain due to change in humidity. ...
AtCSLA7, a Cellulose Synthase-Like Putative
... of relatively uncharacterized genes in plants, called the CELLULOSE SYNTHASE-LIKE (CSL) genes (Richmond and Somerville, 2000; Saxena and Brown, 2000; Hazen et al., 2002) encode glycosyltransferases in this family. These proteins have been divided into between six and eight different subfamilies (dep ...
... of relatively uncharacterized genes in plants, called the CELLULOSE SYNTHASE-LIKE (CSL) genes (Richmond and Somerville, 2000; Saxena and Brown, 2000; Hazen et al., 2002) encode glycosyltransferases in this family. These proteins have been divided into between six and eight different subfamilies (dep ...
Bryophytes and Ferns
... 2. Which of the following is diploid? a. the archegonia of a moss b. a cell in the gametangia of a moss c. a cell that is part of the stalk of a moss sporophyte d. a spore produced by a sporophyte 3. In moss, _____ produce sperm. a. sporangia b. antheridia c. embryos d. archegonia 4. Fertilization i ...
... 2. Which of the following is diploid? a. the archegonia of a moss b. a cell in the gametangia of a moss c. a cell that is part of the stalk of a moss sporophyte d. a spore produced by a sporophyte 3. In moss, _____ produce sperm. a. sporangia b. antheridia c. embryos d. archegonia 4. Fertilization i ...
Wildflowers Activity Booklet
... Some flowers have a lower petal which serves as a landing pad for insects to stand on. Can you find any flowers with this feature? To find out how animals pick up the pollen from the plants, try this activity. Take the pipecleaners from the pack. Gently insert a cleaner, or, if you have small hands, ...
... Some flowers have a lower petal which serves as a landing pad for insects to stand on. Can you find any flowers with this feature? To find out how animals pick up the pollen from the plants, try this activity. Take the pipecleaners from the pack. Gently insert a cleaner, or, if you have small hands, ...
Flower and Seed Dissection
... level, and temperature. Germination is the process through which the embryo inside the seed begins to grow. As the seed germinates, it develops roots, a stem, and then leaves. If a seed is not allowed to germinate within a certain length of time, the embryo inside the seed dies. Each kind of species ...
... level, and temperature. Germination is the process through which the embryo inside the seed begins to grow. As the seed germinates, it develops roots, a stem, and then leaves. If a seed is not allowed to germinate within a certain length of time, the embryo inside the seed dies. Each kind of species ...
Plant Diversity I: Non-vascular vs. vascular plants
... • fertilization is followed by development of the embryo within the archegonium • the embryo develops into a small sporophyte (diploid) - remains attached to the archegonium for absorption of nutrients • the sporophyte is comprised of: – 1. seta (stalk) – 2. sporangium surrounded by a capsule • hapl ...
... • fertilization is followed by development of the embryo within the archegonium • the embryo develops into a small sporophyte (diploid) - remains attached to the archegonium for absorption of nutrients • the sporophyte is comprised of: – 1. seta (stalk) – 2. sporangium surrounded by a capsule • hapl ...
Evolution of Rhaphithamnus venustus (Verbenaceae), A
... mospermy gave negative results. Preliminary primary sporogenous tissue when the bud is ca. studies on Masatierra with R. venustus were 2-3 mm long. Easily discernible at that stage not conclusive, but of 52 manually self-polli- are seven or eight archesporial cells, each with nated flowers in four d ...
... mospermy gave negative results. Preliminary primary sporogenous tissue when the bud is ca. studies on Masatierra with R. venustus were 2-3 mm long. Easily discernible at that stage not conclusive, but of 52 manually self-polli- are seven or eight archesporial cells, each with nated flowers in four d ...
Hoverflies - Neighborhood Naturalist
... In a sunny garden, the eggs hatch in just a few days. A nectar or eating pollen, they become liberally dusted with caterpillar-like little green monster emerges from each egg pollen and inadvertently carry it to the next flower they and begins gorging itself. Eyeless and legless, the voracious visit ...
... In a sunny garden, the eggs hatch in just a few days. A nectar or eating pollen, they become liberally dusted with caterpillar-like little green monster emerges from each egg pollen and inadvertently carry it to the next flower they and begins gorging itself. Eyeless and legless, the voracious visit ...
Bryophytes and Ferns
... 2. Which of the following is diploid? a. the archegonia of a moss b. a cell in the gametangia of a moss c. a cell that is part of the stalk of a moss sporophyte d. a spore produced by a sporophyte 3. In moss, _____ produce sperm. a. sporangia b. antheridia c. embryos d. archegonia 4. Fertilization i ...
... 2. Which of the following is diploid? a. the archegonia of a moss b. a cell in the gametangia of a moss c. a cell that is part of the stalk of a moss sporophyte d. a spore produced by a sporophyte 3. In moss, _____ produce sperm. a. sporangia b. antheridia c. embryos d. archegonia 4. Fertilization i ...
Fossils formatted
... To study petrifactions, thin sections of the rock are cut by special saws to allow passage of transmitted light. The cut surface of the rock is opaque and to make it further transparent, cut surface is ground with a grinding machine, so that more light can pass through the rock and the rock is thin ...
... To study petrifactions, thin sections of the rock are cut by special saws to allow passage of transmitted light. The cut surface of the rock is opaque and to make it further transparent, cut surface is ground with a grinding machine, so that more light can pass through the rock and the rock is thin ...
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.