Plant Evolution - Biology Junction
... 1. Plants are believed to have evolved from a freshwater green algal ancestor over 450 million years ago. a. Both utilize chlorophylls a and b and various accessory pigments. b. In both, the food reserve is starch. c. The cell walls of both contain cellulose. d. DNA base codes for rRNA suggest plant ...
... 1. Plants are believed to have evolved from a freshwater green algal ancestor over 450 million years ago. a. Both utilize chlorophylls a and b and various accessory pigments. b. In both, the food reserve is starch. c. The cell walls of both contain cellulose. d. DNA base codes for rRNA suggest plant ...
Lecture 12: Gymnosperms and Angiosperms
... sporophyte, while the haploid gametophyte stages are microscopic. The unique feature about the life cycle of flowering plants is a double fertilization that produces a diploid zygote and a triploid endosperm or nutritive tissue. ...
... sporophyte, while the haploid gametophyte stages are microscopic. The unique feature about the life cycle of flowering plants is a double fertilization that produces a diploid zygote and a triploid endosperm or nutritive tissue. ...
Classification and Evolution
... hearing pollen or seeds. A single tree usually has both pollen-bearing (male) and seed-bearing (female) cones; males are usually carried on lower branches, or lower down on the same branches as females. Male cones appear in spring, shed pollen, and soon fall from the tree. Female cones are larger, w ...
... hearing pollen or seeds. A single tree usually has both pollen-bearing (male) and seed-bearing (female) cones; males are usually carried on lower branches, or lower down on the same branches as females. Male cones appear in spring, shed pollen, and soon fall from the tree. Female cones are larger, w ...
Notes - Educast
... All pteridophytes have a true alternation of generations, in which a dominant sporophyte generation produces spores through meiosis , and a free-living gametophyte generation forms gametes (egg and sperm) by mitosis . Ferns can be used to illustrate the life cycle stages common to all pteridophytes. ...
... All pteridophytes have a true alternation of generations, in which a dominant sporophyte generation produces spores through meiosis , and a free-living gametophyte generation forms gametes (egg and sperm) by mitosis . Ferns can be used to illustrate the life cycle stages common to all pteridophytes. ...
What is a plant? - Effingham County Schools
... A. Largest group of gymnosperms are the conifers. Ex; pine trees 1. Conifers have 2 types of cones; male and female 2. Male cones produce pollen that carries sperm cells 3. Female cones produce eggs 4. Pollination occurs by the wind: not dependent on water 5. After pollination, the fertilized egg de ...
... A. Largest group of gymnosperms are the conifers. Ex; pine trees 1. Conifers have 2 types of cones; male and female 2. Male cones produce pollen that carries sperm cells 3. Female cones produce eggs 4. Pollination occurs by the wind: not dependent on water 5. After pollination, the fertilized egg de ...
Euglenophyta (Euglenids, trypanosoma
... - Any of various gymnosperms that bear their reproductive structures in cones and belong to the phylum Coniferophyta. Conifers evolved around 300 million years ago and, as a group, show many adaptations to drier and cooler environments. They are usually evergreen and often have drought-resistant lea ...
... - Any of various gymnosperms that bear their reproductive structures in cones and belong to the phylum Coniferophyta. Conifers evolved around 300 million years ago and, as a group, show many adaptations to drier and cooler environments. They are usually evergreen and often have drought-resistant lea ...
seed plants
... One of the female gametophyte cells becomes an egg (n). The rest divide to produce the rest of the cells of the female gametophyte. A male gametophyte (n), or pollen grain, enters the ovule, and the nucleus of one of its cells acts like a sperm, and fertilizes the egg (= zygote). ...
... One of the female gametophyte cells becomes an egg (n). The rest divide to produce the rest of the cells of the female gametophyte. A male gametophyte (n), or pollen grain, enters the ovule, and the nucleus of one of its cells acts like a sperm, and fertilizes the egg (= zygote). ...
Plant
... 3. Ferns and fern allies have several adaptations that algae and bryophytes lack, including vascular tissues and a dominant sporophyte generation. 4. Ferns are the largest and most diverse group of seedless vascular plants. A. Fern sporophytes have roots, rhizomes, and leaves that are megaphylls. Th ...
... 3. Ferns and fern allies have several adaptations that algae and bryophytes lack, including vascular tissues and a dominant sporophyte generation. 4. Ferns are the largest and most diverse group of seedless vascular plants. A. Fern sporophytes have roots, rhizomes, and leaves that are megaphylls. Th ...
Instructions for the Plants II lab
... “receptacle seed” (referring to the fact that the seeds of angiosperms are housed in fruits). As was stated above, all seed plants are heterosporous, but in addition to that, the megaspore is not released from the sporophyte. Instead, the megaspore is housed within an ovule. After fertilization the ...
... “receptacle seed” (referring to the fact that the seeds of angiosperms are housed in fruits). As was stated above, all seed plants are heterosporous, but in addition to that, the megaspore is not released from the sporophyte. Instead, the megaspore is housed within an ovule. After fertilization the ...
1 Plant Diversity General Plants are classified into 4 major groups
... much greater variety of dispersal differences from gymnosperms: more efficient vascular tissues: sieve cells smaller in gymnosperms, larger and with more pores in angiosperms few gymnosperms have xylem vessels, mainly have tracheids angiosperms have flower instead of cone angiosperms surround seed w ...
... much greater variety of dispersal differences from gymnosperms: more efficient vascular tissues: sieve cells smaller in gymnosperms, larger and with more pores in angiosperms few gymnosperms have xylem vessels, mainly have tracheids angiosperms have flower instead of cone angiosperms surround seed w ...
chapter27_Plant Reproduction and Development(1
... • Flowers are shoots that are specialized for reproduction • Modified leaves form their parts • Gamete-producing cells develop in their reproductive structures • Other parts such as petals are adapted to attract and reward pollinators ...
... • Flowers are shoots that are specialized for reproduction • Modified leaves form their parts • Gamete-producing cells develop in their reproductive structures • Other parts such as petals are adapted to attract and reward pollinators ...
Student Workbook 3
... two different kinds of pine cones? The bigger cones, the ones that we are used to seeing on the ground, are the female cones and they contain the seeds that grow into new pine trees. But before they can grow, these seeds must be pollinated by a male cone. ...
... two different kinds of pine cones? The bigger cones, the ones that we are used to seeing on the ground, are the female cones and they contain the seeds that grow into new pine trees. But before they can grow, these seeds must be pollinated by a male cone. ...
a12 PlantDiversity
... independence. Third, the seed coat provides protection for the embryo while it waits to germinate until conditions are suitable. The most familiar gymnosperms are members of the conifer, or “cone-bearing”, group which includes pine, fir, cedar and spruce trees. Gymnosperm means “naked seed”. The see ...
... independence. Third, the seed coat provides protection for the embryo while it waits to germinate until conditions are suitable. The most familiar gymnosperms are members of the conifer, or “cone-bearing”, group which includes pine, fir, cedar and spruce trees. Gymnosperm means “naked seed”. The see ...
Chapter 30 Notes
... The flora and fauna of Earth changed dramatically during the formation of the supercontinent Pangaea in the Permian. Climatic conditions became warmer and drier, favoring the spread of gymnosperms. Many groups of organisms disappeared while others emerged. Amphibians decreased in diversity a ...
... The flora and fauna of Earth changed dramatically during the formation of the supercontinent Pangaea in the Permian. Climatic conditions became warmer and drier, favoring the spread of gymnosperms. Many groups of organisms disappeared while others emerged. Amphibians decreased in diversity a ...
Plant Diversity II - The Evolution of Seed Plants
... The flora and fauna of Earth changed dramatically during the formation of the supercontinent Pangaea in the Permian. Climatic conditions became warmer and drier, favoring the spread of gymnosperms. Many groups of organisms disappeared while others emerged. Amphibians decreased in diversity a ...
... The flora and fauna of Earth changed dramatically during the formation of the supercontinent Pangaea in the Permian. Climatic conditions became warmer and drier, favoring the spread of gymnosperms. Many groups of organisms disappeared while others emerged. Amphibians decreased in diversity a ...
The plant kingdom is in the domain Eukarya and in the supergroup
... gametophyte is fertilized. Note-sperm cells are not released into the environment like seedless plants. The entire male gametophyte is used to deliver the sperm cells. Seeds and pollen eliminates the necessity of water for reproduction. Both can be carried long distances and have a thick coats to re ...
... gametophyte is fertilized. Note-sperm cells are not released into the environment like seedless plants. The entire male gametophyte is used to deliver the sperm cells. Seeds and pollen eliminates the necessity of water for reproduction. Both can be carried long distances and have a thick coats to re ...
Central Core CD
... Once pollen lands on the stigma, it grows a pollen tube down the style to the ovary. The cell within the grain of pollen divides to form two sperm nuclei, which travel down the pollen tube to the embryo sac, fertilizing the egg. ...
... Once pollen lands on the stigma, it grows a pollen tube down the style to the ovary. The cell within the grain of pollen divides to form two sperm nuclei, which travel down the pollen tube to the embryo sac, fertilizing the egg. ...
Botanical Aspects of Pollination
... Following fertilization rapid development of the embryo, endosperm and associated structures appears as rapid growth. The growth is associated with the release of plant growth regulators or plant hormones. Three plant hormones appear to be associated with fruit set and development; Auxin, Gibberelli ...
... Following fertilization rapid development of the embryo, endosperm and associated structures appears as rapid growth. The growth is associated with the release of plant growth regulators or plant hormones. Three plant hormones appear to be associated with fruit set and development; Auxin, Gibberelli ...
Central Core CD - New Mexico FFA
... The germination process begins with the absorption of water. The seed swells and the embryo changes from a dormant state to an actively growing plant. The embryo draws energy from starches stored in the endosperm or cotyledons. The embryo’s root emerges from the seed and develops into the primary ro ...
... The germination process begins with the absorption of water. The seed swells and the embryo changes from a dormant state to an actively growing plant. The embryo draws energy from starches stored in the endosperm or cotyledons. The embryo’s root emerges from the seed and develops into the primary ro ...
exam 4 practice questions
... 21. A mature male Angiosperm gametophyte consists of _____ total cells, while a mature female has _____ total cells with ____ nuclei. 22. Fertilization can occur only after pollination in Angiosperms. a. True b. false 23. A pollen grain is a MATURE/ IMMATURE male GAMETOPHYTE/ SPOROPHYTE. 24. Ovaries ...
... 21. A mature male Angiosperm gametophyte consists of _____ total cells, while a mature female has _____ total cells with ____ nuclei. 22. Fertilization can occur only after pollination in Angiosperms. a. True b. false 23. A pollen grain is a MATURE/ IMMATURE male GAMETOPHYTE/ SPOROPHYTE. 24. Ovaries ...
NCERT Solutions Question 1: Name the parts of an angiosperm
... The female gametophyte (embryo sac) develops from a single functional megaspore. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. The first mitotic division in the megaspore forms two nuclei. One nucleus moves towards the micropylar end while the other ...
... The female gametophyte (embryo sac) develops from a single functional megaspore. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. The first mitotic division in the megaspore forms two nuclei. One nucleus moves towards the micropylar end while the other ...
Study Materials
... Plant Kingdom because they live in soil but require water for sexual reproduction. They grow in moist shady places. The dominant phase in the life cycle is haploid gametophyte. It may be a flattened thallus or differentiated into stem-like, root-like and leaf-like structures. The root-like structure ...
... Plant Kingdom because they live in soil but require water for sexual reproduction. They grow in moist shady places. The dominant phase in the life cycle is haploid gametophyte. It may be a flattened thallus or differentiated into stem-like, root-like and leaf-like structures. The root-like structure ...
Pinophyta
The conifers, division Pinophyta, also known as division Coniferophyta or Coniferae, are one of 12 extant division-level taxa within the Kingdom Plantae (Viridiplantae) and 10 within the extant land plants. Pinophytes are gymnosperms, cone-bearing seed plants with vascular tissue. All extant conifers are woody plants with secondary growth, the great majority being trees with just a few being shrubs. Typical examples of conifers include cedars, Douglas-firs, cypresses, firs, junipers, kauri, larches, pines, hemlocks, redwoods, spruces, and yews. The division contains approximately eight families, 68 genera, and 630 living species.Although the total number of species is relatively small, conifers are of immense ecological importance. They are the dominant plants over huge areas of land, most notably the boreal forests of the northern hemisphere, but also in similar cool climates in mountains further south. Boreal conifers have many wintertime adaptations. The narrow conical shape of northern conifers, and their downward-drooping limbs, help them shed snow. Many of them seasonally alter their biochemistry to make them more resistant to freezing, called ""hardening"". While tropical rainforests have more biodiversity and turnover, the immense conifer forests of the world represent the largest terrestrial carbon sink, i.e. where carbon from atmospheric CO2 is bound as organic compounds.They are also of great economic value, primarily for timber and paper production; the wood of conifers is known as softwood.Conifer is a Latin word, a compound of conus (cone) and ferre (to bear), meaning ""the one that bears (a) cone(s)"".