Gymnosperms + Seed and Pollen Basics
... wood that has been digested so that the individual cells separate from one another. Then the suspension of cells is mounted and the result is known as a maceration in which we can determine the types of cells present. Keep in mind that this sample is secondary xylem only so only those cells describe ...
... wood that has been digested so that the individual cells separate from one another. Then the suspension of cells is mounted and the result is known as a maceration in which we can determine the types of cells present. Keep in mind that this sample is secondary xylem only so only those cells describe ...
Chapter-3 PLANT KINGDOM
... • Stamen has filament and anther. Anthers bear pollen grains. Pollen grains have two male gametes. • Pistil has stigma, style and ovary. Ovary has ovule in which female gametophyte (embry sac) develops. • Embryo sac has 7 cells and 8 nuclei. One egg cell, 2 synergids, 3 antipodals and two polar nucl ...
... • Stamen has filament and anther. Anthers bear pollen grains. Pollen grains have two male gametes. • Pistil has stigma, style and ovary. Ovary has ovule in which female gametophyte (embry sac) develops. • Embryo sac has 7 cells and 8 nuclei. One egg cell, 2 synergids, 3 antipodals and two polar nucl ...
REPRODUCTION IN ANIMALS
... sperms get exposed to water movement, wind and rainfall. Also, there are other animals in the pond which may feed on eggs. Thus, production of large number of eggs and sperms is necessary to ensure fertilization of at least a few of them. Q.6. How could a single cell become such a big individual? An ...
... sperms get exposed to water movement, wind and rainfall. Also, there are other animals in the pond which may feed on eggs. Thus, production of large number of eggs and sperms is necessary to ensure fertilization of at least a few of them. Q.6. How could a single cell become such a big individual? An ...
video slide
... Pollen and Production of Sperm • Microspores develop into pollen grains, which contain the male gametophytes • Pollination is the transfer of pollen to the part of a seed plant containing the ovules • Pollen can be dispersed by air or animals, eliminating the water requirement for fertilization • I ...
... Pollen and Production of Sperm • Microspores develop into pollen grains, which contain the male gametophytes • Pollination is the transfer of pollen to the part of a seed plant containing the ovules • Pollen can be dispersed by air or animals, eliminating the water requirement for fertilization • I ...
Sexual Reproduction - SD43 Teacher Sites
... bodies of the parents. If a sperm cell comes in contact with an egg cell of the same species, fertilization may occur. External fertilization is common in animals that live in the water. Both sea urchins and fish such as salmon use this method. The males and females of both species release their gam ...
... bodies of the parents. If a sperm cell comes in contact with an egg cell of the same species, fertilization may occur. External fertilization is common in animals that live in the water. Both sea urchins and fish such as salmon use this method. The males and females of both species release their gam ...
seed - ScienceToGo
... A pollen grain that has landed on a stigma germinates and the pollen tube of the male gametophyte grows down to the ovary ...
... A pollen grain that has landed on a stigma germinates and the pollen tube of the male gametophyte grows down to the ovary ...
Annelids Powerpoint
... Includes sandworms & clamworms Have paddle-like parapodia to move Take in oxygen through parapodia Some are free-swimming predators with strong jaws to feed on small animals • Many live commensally with sponges, ...
... Includes sandworms & clamworms Have paddle-like parapodia to move Take in oxygen through parapodia Some are free-swimming predators with strong jaws to feed on small animals • Many live commensally with sponges, ...
developmental biology 5 fertilization Introduction: Special features of
... This change in membrane potential opens up the calcium channels and allows calcium to enter the sperm facilitating the process of membrane fusion during acrosomal reaction. • Protein phosphorylation occurs. However it not known whether these events are independent of one another and to what extent e ...
... This change in membrane potential opens up the calcium channels and allows calcium to enter the sperm facilitating the process of membrane fusion during acrosomal reaction. • Protein phosphorylation occurs. However it not known whether these events are independent of one another and to what extent e ...
DEVELOPMENTAL BIOLOGY 5 FERTILIZATION
... This change in membrane potential opens up the calcium channels and allows calcium to enter the sperm facilitating the process of membrane fusion during acrosomal reaction. • Protein phosphorylation occurs. However it not known whether these events are independent of one another and to what extent e ...
... This change in membrane potential opens up the calcium channels and allows calcium to enter the sperm facilitating the process of membrane fusion during acrosomal reaction. • Protein phosphorylation occurs. However it not known whether these events are independent of one another and to what extent e ...
BIOL 153L General Biology
... 10. Although conifers are the most familiar of the gymnosperms, some gymnosperms lack needles and/or cones. Some of these other extant gymnosperms are described below. Ginkgoes (pp. 450-453) have broad fan-shaped leaves and fleshy (and stinky) yellow cones. Although once found worldwide, their natur ...
... 10. Although conifers are the most familiar of the gymnosperms, some gymnosperms lack needles and/or cones. Some of these other extant gymnosperms are described below. Ginkgoes (pp. 450-453) have broad fan-shaped leaves and fleshy (and stinky) yellow cones. Although once found worldwide, their natur ...
HOW DO ORGANISMS REPRODUCE
... embryo sac is seven celled and 8 nucleate structures. Three micropylar cells contain three micropylar nuclei. Three chalazal cells contain 3 chalazal nuclei. One central cell contains two polar nuclei. ...
... embryo sac is seven celled and 8 nucleate structures. Three micropylar cells contain three micropylar nuclei. Three chalazal cells contain 3 chalazal nuclei. One central cell contains two polar nuclei. ...
Ferns
and
Conifers LAB: Lab Atlas Chapters 7 and 8
... upward from the rhizome are the megaphylls (called sporophylls if there are sori on them), leaves or fronds. Each megaphyll is on a petiole. Note the veins of vascular tissue running through the leaflets. On the undersides of some of the megaphyll leaves are sporangia, which are in clusters ca ...
... upward from the rhizome are the megaphylls (called sporophylls if there are sori on them), leaves or fronds. Each megaphyll is on a petiole. Note the veins of vascular tissue running through the leaflets. On the undersides of some of the megaphyll leaves are sporangia, which are in clusters ca ...
Concepts in Biology, First Edition Sylvia Mader
... The ovule now contains the mature female gametophyte (embryo sac), which typically consists of eight haploid nuclei embedded in a mass of cytoplasm. The cytoplasm differentiates into cells, one of which is an egg and another of which contains two polar nuclei. ...
... The ovule now contains the mature female gametophyte (embryo sac), which typically consists of eight haploid nuclei embedded in a mass of cytoplasm. The cytoplasm differentiates into cells, one of which is an egg and another of which contains two polar nuclei. ...
Asexual reproduction
... Development of the Embryo Sac Each ovary contains one or more ovules. An ovule has two walls called integuments. The integuments have a small opening the micropyle through which a pollen tube can enter. The bulk of the ovule consists of diploid nucellus cells that supply nutrients for later growth ...
... Development of the Embryo Sac Each ovary contains one or more ovules. An ovule has two walls called integuments. The integuments have a small opening the micropyle through which a pollen tube can enter. The bulk of the ovule consists of diploid nucellus cells that supply nutrients for later growth ...
Plants Fungus and Lichens Review
... 1. List the 6 general characteristics of plants. 2. What did plants probably evolve from? 3. What are some advantages for life on land for a plant? 4. What are the 3 main groups of plants? 5. List 3 examples of aquatic plants. 6. Explain the difference between mitosis and meiosis. 7. All land plants ...
... 1. List the 6 general characteristics of plants. 2. What did plants probably evolve from? 3. What are some advantages for life on land for a plant? 4. What are the 3 main groups of plants? 5. List 3 examples of aquatic plants. 6. Explain the difference between mitosis and meiosis. 7. All land plants ...
Plants Review and Key
... 1. List the 6 general characteristics of plants. 2. What did plants probably evolve from? 3. What are some advantages for life on land for a plant? 4. What are the 3 main groups of plants? 5. List 3 examples of aquatic plants. 6. Explain the difference between mitosis and meiosis. 7. All land plants ...
... 1. List the 6 general characteristics of plants. 2. What did plants probably evolve from? 3. What are some advantages for life on land for a plant? 4. What are the 3 main groups of plants? 5. List 3 examples of aquatic plants. 6. Explain the difference between mitosis and meiosis. 7. All land plants ...
Double Fertilization
... In plants fertilization is the event in sexual reproduction which follows pollination. In higher plants, two sperm are involved in fertilization, reaching the ovule via a pollen tube from the germinating pollen grains. One sperm fertilizes the egg cell within the embryo sac to produce the zygote and ...
... In plants fertilization is the event in sexual reproduction which follows pollination. In higher plants, two sperm are involved in fertilization, reaching the ovule via a pollen tube from the germinating pollen grains. One sperm fertilizes the egg cell within the embryo sac to produce the zygote and ...
Turtle Dissection
... but kept in body until just before hatching or can hatch inside female Nourishment comes from egg not mother Ex: Some reptiles (snakes) ...
... but kept in body until just before hatching or can hatch inside female Nourishment comes from egg not mother Ex: Some reptiles (snakes) ...
Turtle Dissection PowerPoint
... but kept in body until just before hatching or can hatch inside female Nourishment comes from egg not mother Ex: Some reptiles (snakes) ...
... but kept in body until just before hatching or can hatch inside female Nourishment comes from egg not mother Ex: Some reptiles (snakes) ...
Topic: Reproduction
... 3. Explain what occurs during pollination. 4. Explain what occurs after pollination. 5. Explain what happens to the flower once the eggs are fertilized. 6. Describe the structure of a seed. ...
... 3. Explain what occurs during pollination. 4. Explain what occurs after pollination. 5. Explain what happens to the flower once the eggs are fertilized. 6. Describe the structure of a seed. ...
Reproduction and Development
... After pollen grain lands on stigma, the generative cell divides by mitosis into two haploid sperm cells 1 sperm fertilizes egg; forms the zygote (2n) 1 sperm fertilizes polar nuclei; forms endosperm (3n) ...
... After pollen grain lands on stigma, the generative cell divides by mitosis into two haploid sperm cells 1 sperm fertilizes egg; forms the zygote (2n) 1 sperm fertilizes polar nuclei; forms endosperm (3n) ...
File
... • It affects 10% of the population and can be reduced by limiting contact with the allergen • Treatment include anti – histamine drugs and other drugs that partially inhibit the allergic response ...
... • It affects 10% of the population and can be reduced by limiting contact with the allergen • Treatment include anti – histamine drugs and other drugs that partially inhibit the allergic response ...
Aarssen Lectures 1-12 + Grogan Fungus Lectures Lecture 1
... non-vascular, gametic metois, anchored to substrate with rhizoids: these do not partake in water of nutrient conduction. They absorb water and inorganic ions directly through the gametophyte surface. Dries up and becomes dormant in absence of water, and resumes growth when water becomes available ag ...
... non-vascular, gametic metois, anchored to substrate with rhizoids: these do not partake in water of nutrient conduction. They absorb water and inorganic ions directly through the gametophyte surface. Dries up and becomes dormant in absence of water, and resumes growth when water becomes available ag ...
Untitled - UW Canvas
... before or after the pollen grains are released. If pollen is released as two-celled, then the generative cell divides within the pollen tube as it travels down the style (Figure 6.8A). Whether pollen grains are 2- or 3-nucleate at release can be an important taxonomic character (Chapter 11). The pol ...
... before or after the pollen grains are released. If pollen is released as two-celled, then the generative cell divides within the pollen tube as it travels down the style (Figure 6.8A). Whether pollen grains are 2- or 3-nucleate at release can be an important taxonomic character (Chapter 11). The pol ...
Fertilisation
Fertilisation (also known as conception, fecundation and syngamy) is the fusion of gametes to initiate the development of a new individual organism. In animals, the process involves the fusion of an ovum with a sperm, which first creates a zygote and then leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilisation, or outside (external fertilisation). The cycle of fertilisation and development of new individuals is called sexual reproduction.