Floral specialization and angiosperm diversity: phenotypic
... where three-quarters of the species have flowers with petals, even though the basal condition is for flowers to lack petals. If petals are adaptive (say attracting more pollinators, increasing reproductive success), there may be differential transitions between states (Fig. 1), such that lineages wi ...
... where three-quarters of the species have flowers with petals, even though the basal condition is for flowers to lack petals. If petals are adaptive (say attracting more pollinators, increasing reproductive success), there may be differential transitions between states (Fig. 1), such that lineages wi ...
2012 Alston Publishing House Pte Ltd Science SMART Teacher`s
... Science SMART Teacher’s Guide Grade 5 Chapter 1 Lesson Plans ...
... Science SMART Teacher’s Guide Grade 5 Chapter 1 Lesson Plans ...
Gymnosperms
... • Phylum Cycadophyta the cycads • Phylum Coniferophyta (or Pinophyta) the conifers ...
... • Phylum Cycadophyta the cycads • Phylum Coniferophyta (or Pinophyta) the conifers ...
Ch. 17 Presentation
... 2. Meiosis in the ovule produces a haploid spore that forms the few cells of the female gametophyte, one of which becomes the egg. 3. Pollination occurs when a pollen grain lands on the stigma. A pollen tube grows from the pollen grain to the ovule. 4. The tube carries a sperm that fertilizes the eg ...
... 2. Meiosis in the ovule produces a haploid spore that forms the few cells of the female gametophyte, one of which becomes the egg. 3. Pollination occurs when a pollen grain lands on the stigma. A pollen tube grows from the pollen grain to the ovule. 4. The tube carries a sperm that fertilizes the eg ...
biology1
... -A small sporophyte generation retained within or supported by the gametophyte plant is typical of Mosses Ferns Mosses and ferns Angiosperms ...
... -A small sporophyte generation retained within or supported by the gametophyte plant is typical of Mosses Ferns Mosses and ferns Angiosperms ...
Magnification changer with magnification scale
... the back side of leaves. Like all other vascular plants, they have a life cycle referred to as alternation of generations, characterized by a diploid sporophytic and a haploid gametophytic phase. Unlike the gymnosperms and angiosperms, the ferns' gametophyte is a free-living organism. ...
... the back side of leaves. Like all other vascular plants, they have a life cycle referred to as alternation of generations, characterized by a diploid sporophytic and a haploid gametophytic phase. Unlike the gymnosperms and angiosperms, the ferns' gametophyte is a free-living organism. ...
Plants with Seeds
... both male and female structures • Male gametophytes are contained within pollen grains produced by the microsporangia of anthers • The female gametophyte, or embryo sac, develops within an ovule contained within an ovary at the base of a stigma • Most flowers have mechanisms to ensure cross-pollinat ...
... both male and female structures • Male gametophytes are contained within pollen grains produced by the microsporangia of anthers • The female gametophyte, or embryo sac, develops within an ovule contained within an ovary at the base of a stigma • Most flowers have mechanisms to ensure cross-pollinat ...
REPRODUCTION IN PLANTS
... (a) Annuals : Plants live for one year. The plants which produce flowers and seeds within one season are called annuals eg. pea (b) Biennials : Plants which complete their life cycle in two seasons are called biennials. In the first year, the plants remain in the vegetative state. In the second year ...
... (a) Annuals : Plants live for one year. The plants which produce flowers and seeds within one season are called annuals eg. pea (b) Biennials : Plants which complete their life cycle in two seasons are called biennials. In the first year, the plants remain in the vegetative state. In the second year ...
Bio13 Plant Kingdom
... stems and in the production of reproductive structures (cones, flowers, fruits). • The roots are typically the place where food is stored, but some plants store food in their stems. ...
... stems and in the production of reproductive structures (cones, flowers, fruits). • The roots are typically the place where food is stored, but some plants store food in their stems. ...
Chapter 9 THE KINGDOM PLANTAE
... The nonvascular plants; liverworts, hornworts and mosses are grouped together in a single division bryophyta (Gr, bryon, "moss"). Bryophytes display a key adaptation that first made the move onto land possible: the embryophyte condition. Their gametes develop within gametangia. The male gametangium, ...
... The nonvascular plants; liverworts, hornworts and mosses are grouped together in a single division bryophyta (Gr, bryon, "moss"). Bryophytes display a key adaptation that first made the move onto land possible: the embryophyte condition. Their gametes develop within gametangia. The male gametangium, ...
Plant Flowers
... found at the base in the center of the flower. Its internodes are short and the number of leaves attached to it is usually small, so the receptacle is not usually a large or obvious part of the flower. Sepals make up the lower (or outermost) whorl of floral leaves. They are frequently, but not alway ...
... found at the base in the center of the flower. Its internodes are short and the number of leaves attached to it is usually small, so the receptacle is not usually a large or obvious part of the flower. Sepals make up the lower (or outermost) whorl of floral leaves. They are frequently, but not alway ...
PST 102 - Fountain University, Osogbo
... (i) Genetic stability: Mitosis produces two nuclei which have the same number of chromosomes as the parent cell. Daughter cells are genetically identical to the parent cell and no variation in genetic information can therefore be introduced during mitosis. (ii) Growth: The number of cells within an ...
... (i) Genetic stability: Mitosis produces two nuclei which have the same number of chromosomes as the parent cell. Daughter cells are genetically identical to the parent cell and no variation in genetic information can therefore be introduced during mitosis. (ii) Growth: The number of cells within an ...
introduction
... When identifying flower parts, it is best to start on the outside of the flower and work towards the middle: Sepals: a modified leaf, part of the outermost of the four groups of flower parts. The sepals of a flower are collectively called the calyx and act as a protective covering of the inner flowe ...
... When identifying flower parts, it is best to start on the outside of the flower and work towards the middle: Sepals: a modified leaf, part of the outermost of the four groups of flower parts. The sepals of a flower are collectively called the calyx and act as a protective covering of the inner flowe ...
Lab 2 Packet
... When identifying flower parts, it is best to start on the outside of the flower and work towards the middle: Sepals: a modified leaf, part of the outermost of the four groups of flower parts. The sepals of a flower are collectively called the calyx and act as a protective covering of the inner flowe ...
... When identifying flower parts, it is best to start on the outside of the flower and work towards the middle: Sepals: a modified leaf, part of the outermost of the four groups of flower parts. The sepals of a flower are collectively called the calyx and act as a protective covering of the inner flowe ...
Biology 2 Lab Packet For Practical 2
... When identifying flower parts, it is best to start on the outside of the flower and work towards the middle: Sepals: a modified leaf, part of the outermost of the four groups of flower parts. The sepals of a flower are collectively called the calyx and act as a protective covering of the inner flowe ...
... When identifying flower parts, it is best to start on the outside of the flower and work towards the middle: Sepals: a modified leaf, part of the outermost of the four groups of flower parts. The sepals of a flower are collectively called the calyx and act as a protective covering of the inner flowe ...
Lab-8, Cycads
... Now obtain a prepared slide of a longitudinally sectioned ovule. Locate the megagametophyte and nucellus. Locate also the integuments. You should be able to see vascular strands in this tissue. At the micropylar end of the gametophyte you will see one or more large, elliptical appearing archegonia. ...
... Now obtain a prepared slide of a longitudinally sectioned ovule. Locate the megagametophyte and nucellus. Locate also the integuments. You should be able to see vascular strands in this tissue. At the micropylar end of the gametophyte you will see one or more large, elliptical appearing archegonia. ...
Document
... Cutin found in cuticle that helps prevent pathogen attack Wax prevents dessication Stomata are pores that open and close to allow gas exchange while minimizing water loss ...
... Cutin found in cuticle that helps prevent pathogen attack Wax prevents dessication Stomata are pores that open and close to allow gas exchange while minimizing water loss ...
Angiosperms - Plant Biology
... 1. Angiosperms, or flowering plants, are unique in having ovules borne inside carpels, rather than on naked scales or leaves, as in gymnosperms. The ovule is fertilized by a pollen grain that is transferred from a stamen to a carpel by wind, water, or animals and then germinates into a tube that gro ...
... 1. Angiosperms, or flowering plants, are unique in having ovules borne inside carpels, rather than on naked scales or leaves, as in gymnosperms. The ovule is fertilized by a pollen grain that is transferred from a stamen to a carpel by wind, water, or animals and then germinates into a tube that gro ...
PLANT PACKET 2 08
... In angiosperm plants, seeds develop after a sperm fertilizes an egg inside the female part of the plant. The fertilized egg and sperm nucleus form a zygote. This zygote will develop into the new plant and is protected and nourished by the surrounding seed. Protecting the seed is a fruit. Sometimes t ...
... In angiosperm plants, seeds develop after a sperm fertilizes an egg inside the female part of the plant. The fertilized egg and sperm nucleus form a zygote. This zygote will develop into the new plant and is protected and nourished by the surrounding seed. Protecting the seed is a fruit. Sometimes t ...
Chapter 30 Plants II
... 3. Pollen eliminated the liquid-water requirement for fertilization • The microspores, released from the microsporangium, develop into pollen grains. • These are covered with a tough coat containing sporopollenin. • They are carried away by wind or animals until pollination occurs when they land in ...
... 3. Pollen eliminated the liquid-water requirement for fertilization • The microspores, released from the microsporangium, develop into pollen grains. • These are covered with a tough coat containing sporopollenin. • They are carried away by wind or animals until pollination occurs when they land in ...
plant kingdom
... antherozoids. The female sex organ called archegonium is flask-shaped and produces a single egg. The antherozoids are released into water where they come in contact with archegonium. An antherozoid fuses with the egg to produce the zygote. Zygotes do not undergo reduction division immediately. They ...
... antherozoids. The female sex organ called archegonium is flask-shaped and produces a single egg. The antherozoids are released into water where they come in contact with archegonium. An antherozoid fuses with the egg to produce the zygote. Zygotes do not undergo reduction division immediately. They ...
B: Chapter 4: Plant Reproduction
... produce eggs and male reproductive organs produce sperm. Depending on the species, these reproductive organs can be on the same plant or on separate plants, as shown in Figure 3. If a plant has both organs, it usually can reproduce by itself. However, some plants that have both sex organs still must ...
... produce eggs and male reproductive organs produce sperm. Depending on the species, these reproductive organs can be on the same plant or on separate plants, as shown in Figure 3. If a plant has both organs, it usually can reproduce by itself. However, some plants that have both sex organs still must ...
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.