The Evolution of Ovule Number and Flower Size in
... benefit from producing many small inexpensive flowers, even though some flowers capture too few pollen grains to fertilize their ovules. Wind-pollinated plants with numerous flowers distributed throughout the inflorescence, each with a single ovule or a few ovules, sample more of the airstream, and ...
... benefit from producing many small inexpensive flowers, even though some flowers capture too few pollen grains to fertilize their ovules. Wind-pollinated plants with numerous flowers distributed throughout the inflorescence, each with a single ovule or a few ovules, sample more of the airstream, and ...
Safe sex in plants - Department of Biological Sciences
... unwanted animal visitors, such as those that steal the nectar without affecting pollination and those that eat flowers, can have adverse effects on pollinator attraction and the number and quality of the offspring that are produced by plants through both the male (pollen) and female (seed production ...
... unwanted animal visitors, such as those that steal the nectar without affecting pollination and those that eat flowers, can have adverse effects on pollinator attraction and the number and quality of the offspring that are produced by plants through both the male (pollen) and female (seed production ...
What are the parts of a flower?
... Separation of male and female structures in space -Dioecious- the plant produces only male or female -Monoecious- produces male and female flowers on the same plant Separation of male and female structures in time -Even if functional stamens and pistils are both found in the same flower, they may re ...
... Separation of male and female structures in space -Dioecious- the plant produces only male or female -Monoecious- produces male and female flowers on the same plant Separation of male and female structures in time -Even if functional stamens and pistils are both found in the same flower, they may re ...
Chapter 31
... • Advancement: 1 or more features vs. relatively primitive • Carpels: apocarpous vs. syncarpous • Flowers: primitive to well developed • Pollen: monosulcate vs. tricolpate (for dicots) • Stomatal subsidiary cells: 04 (for monocots) ...
... • Advancement: 1 or more features vs. relatively primitive • Carpels: apocarpous vs. syncarpous • Flowers: primitive to well developed • Pollen: monosulcate vs. tricolpate (for dicots) • Stomatal subsidiary cells: 04 (for monocots) ...
Seed Plants - Gymnosperms
... The term gymnosperms refers to a diverse group of seed plants that do not produce flowers, but do produce pollen and seeds. The largest and best known gymnosperm division is Coniferophyta, which includes pines, redwoods, cypresses, junipers, other cone-bearing trees and shrubs. Many have thick needl ...
... The term gymnosperms refers to a diverse group of seed plants that do not produce flowers, but do produce pollen and seeds. The largest and best known gymnosperm division is Coniferophyta, which includes pines, redwoods, cypresses, junipers, other cone-bearing trees and shrubs. Many have thick needl ...
FLOWERS AS REPRODUCTIVE STRUCTURES
... The stamens are the male organs and produce pollen that contain the male gametes The pistil with the stigma, style and ovary is the female organ of the plant. The ovulums are found in the ovule. Lorraine Kuun, July 2011 ...
... The stamens are the male organs and produce pollen that contain the male gametes The pistil with the stigma, style and ovary is the female organ of the plant. The ovulums are found in the ovule. Lorraine Kuun, July 2011 ...
Plant Reproduction - Petal School District
... 8) What stage is created when sperm and egg fuse: sporophyte or gametophyte? ...
... 8) What stage is created when sperm and egg fuse: sporophyte or gametophyte? ...
Stabilizing Selection and the Structural Variability of Flowers within
... Zoophilous flowers often appear to be formed so as to place pollen on the body of a pollinator in a position where it will contact the stigma of a subsequently visited flower (Proctor, Yeo and Lack, 1996). As a general principle, natural selection is said to shape the evolution of flowers by matchin ...
... Zoophilous flowers often appear to be formed so as to place pollen on the body of a pollinator in a position where it will contact the stigma of a subsequently visited flower (Proctor, Yeo and Lack, 1996). As a general principle, natural selection is said to shape the evolution of flowers by matchin ...
Biology 20 Laboratory Plant Diversity and Reproduction OBJECTIVE
... differ. If there is one cotyledon, the plant is termed a monocotyledon (monocot). If there are two cotyledons, the plant is termed a dicotcotyledon (dicot). This is a major distinction by which angiosperms are divided and classified. You will see remnants of the cotyledons when we look at fruits and ...
... differ. If there is one cotyledon, the plant is termed a monocotyledon (monocot). If there are two cotyledons, the plant is termed a dicotcotyledon (dicot). This is a major distinction by which angiosperms are divided and classified. You will see remnants of the cotyledons when we look at fruits and ...
vesca. - Genetics
... leaflet, and stouter rootstocks and runners (the last two characteristics possibly due to heterosis and, at all events, unimportant). The possible explanations of the origin of this plant are: (1) mutation; (2) contamination of the pollen of F . virginiana with the pollen of a redfruited F. vesca, a ...
... leaflet, and stouter rootstocks and runners (the last two characteristics possibly due to heterosis and, at all events, unimportant). The possible explanations of the origin of this plant are: (1) mutation; (2) contamination of the pollen of F . virginiana with the pollen of a redfruited F. vesca, a ...
Short Questions
... 57. Seeds may remain inactive for a period before germination. What term is used to describe this period of inactivity? 58. In which part of the flower is pollen produced? 59. List three characteristics in each case of; 1. An insect-pollinated flower, 2. A wind-pollinated flower. 60. What process fo ...
... 57. Seeds may remain inactive for a period before germination. What term is used to describe this period of inactivity? 58. In which part of the flower is pollen produced? 59. List three characteristics in each case of; 1. An insect-pollinated flower, 2. A wind-pollinated flower. 60. What process fo ...
Box 9.1 Mr. Hofmeister and the vanishing gametophyte
... Box 9.1 Mr. Hofmeister and the vanishing gametophyte The evolution of plant life cycles Sadly, plant life cycles are too often taught, if at all, through memorizing the stages and tissue types in the life cycle of a flowering plant. This is hardly an inspiration to further study in botany. Although ...
... Box 9.1 Mr. Hofmeister and the vanishing gametophyte The evolution of plant life cycles Sadly, plant life cycles are too often taught, if at all, through memorizing the stages and tissue types in the life cycle of a flowering plant. This is hardly an inspiration to further study in botany. Although ...
video slide
... develops from a single carpel (or several fused carpels) of one flower (examples: pea, ...
... develops from a single carpel (or several fused carpels) of one flower (examples: pea, ...
Section 24.3 Summary – pages 646-657
... • Animals, such as insects and birds, brush up against the anthers while trying to get to the nectar. ...
... • Animals, such as insects and birds, brush up against the anthers while trying to get to the nectar. ...
Lectures 8-15 (word format)
... ▼ vascular tissue differences • vessel members (conduction) and fibres (support) are specialized angiosperm xylem cells that have evolved from the ...
... ▼ vascular tissue differences • vessel members (conduction) and fibres (support) are specialized angiosperm xylem cells that have evolved from the ...
CHAPTER 4: REPRODUCTION SEXUAL AND ASEXUAL
... Sterility is the inability to reproduce. A man may be sterile because his testes do not produce enough sperms, or his sperms may not be able to reach an ovum in the fallopian tube. A woman may be sterile because she fails to ovulate or there is a blockage in her fallopian tube, preventing the ovum a ...
... Sterility is the inability to reproduce. A man may be sterile because his testes do not produce enough sperms, or his sperms may not be able to reach an ovum in the fallopian tube. A woman may be sterile because she fails to ovulate or there is a blockage in her fallopian tube, preventing the ovum a ...
Structural Botany Laboratory 10 Cordaitales and Coniferales
... Coniferales is the cone. These cones are monosporangiate (i.e., a given cone produces either ovules or pollen, but not both). In general, conifers are monoecious in that a given plant will produce both ovulate or seed cones and pollen cones, but some species are dioecious like cycads and Ginkgo. As ...
... Coniferales is the cone. These cones are monosporangiate (i.e., a given cone produces either ovules or pollen, but not both). In general, conifers are monoecious in that a given plant will produce both ovulate or seed cones and pollen cones, but some species are dioecious like cycads and Ginkgo. As ...
lecture outline
... Seed dormancy increases the chances that germination will occur at a time and place most advantageous to the seedling. o For example, seeds of many desert plants germinate only after a substantial rainfall, thus ensuring enough water to complete development. o Where natural fires are common, many se ...
... Seed dormancy increases the chances that germination will occur at a time and place most advantageous to the seedling. o For example, seeds of many desert plants germinate only after a substantial rainfall, thus ensuring enough water to complete development. o Where natural fires are common, many se ...
Part 2
... Material above modified from material found at: http://science.jburroughs.org/resources/flower/fruit3.html, http://www.resnet.wm.edu/~mcmath/bio205/fruits.html, http://waynesword.palomar.edu/fruitid1.htm, http://www.seriouseats.com/2010/04/what-are-the-differences-between-nuts-and-drupes.html, http: ...
... Material above modified from material found at: http://science.jburroughs.org/resources/flower/fruit3.html, http://www.resnet.wm.edu/~mcmath/bio205/fruits.html, http://waynesword.palomar.edu/fruitid1.htm, http://www.seriouseats.com/2010/04/what-are-the-differences-between-nuts-and-drupes.html, http: ...
Spores versus seeds, and then fruit
... Gymnosperm sex involves . . . Large female sporophyte cones bear t wo sporangia; these are called ovules. Each ovule produces four haploid megaspores using meiosis. One megaspore develops into the female gametophyte. The female gametophyte slowly produces t wo to six egg cells. Separately, but simu ...
... Gymnosperm sex involves . . . Large female sporophyte cones bear t wo sporangia; these are called ovules. Each ovule produces four haploid megaspores using meiosis. One megaspore develops into the female gametophyte. The female gametophyte slowly produces t wo to six egg cells. Separately, but simu ...
Angiosperms: Phylum Anthophyta, the flowering plants
... the seed plants are all shown in this diagram: 1. Very small gametophytes that are nourished by and protected inside the parental sporophyte (reduced even further in angiosperms) 2. Pollen grains, which provide protection and dispersal for the male gametophyte (often animal-dispersed in angiosperm ...
... the seed plants are all shown in this diagram: 1. Very small gametophytes that are nourished by and protected inside the parental sporophyte (reduced even further in angiosperms) 2. Pollen grains, which provide protection and dispersal for the male gametophyte (often animal-dispersed in angiosperm ...
The Green Machine
... and Mossamedes deserts of southwestern Africa. It is rather strange in appearance, possessing a long taproot along with a short stem that usually supports two permanent strap-like leaves. Welwitschia mirabilis may live for more than 1,000 years. ...
... and Mossamedes deserts of southwestern Africa. It is rather strange in appearance, possessing a long taproot along with a short stem that usually supports two permanent strap-like leaves. Welwitschia mirabilis may live for more than 1,000 years. ...
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.