2318364665 | Insects help angiosperms to | reproduce sexually with physically distant members of their own species | | 0 |
2318369410 | Many angiosperms lure insects with | nectar; both plant and pollinator benefit | | 1 |
2318371380 | Mutualistic symbioses are common between | plants and other species | | 2 |
2318373266 | Angiosperms are the most | important group of plants in terrestrial ecosystems and in agriculture | | 3 |
2318376918 | Plant life cycles are characterized by | by the alternation between sporophyte (spore-producing) and gametophyte (gamete-producing) generations | | 4 |
2318378937 | Flowers, double fertilization, and fruits are | key features of the angiosperm life cycle | | 5 |
2318381545 | In angiosperms, the sporophyte is | the plant that we see; they are larger, more conspicuous and longer-lived than gametophytes | | 6 |
2318382806 | The angiosperm life cycle is characterized by "three Fs": | flowers, double fertilization, and fruits | | 7 |
2318386583 | Flowers are | the reproductive shoots of the angiosperm sporophyte; they attach to a part of the stem called the receptacle
*Shortened stem with four whorls of modified leaves | | 8 |
2318390234 | Flowers consist of four floral organs: | carpels, stamens, petals, and sepals | | 9 |
2318392102 | Stamens and carpels are | reproductive organs; sepals and petals are sterile | | 10 |
2318395539 | A carpel has a long ... | style with a stigma on which pollen may land | | 11 |
2318396671 | At the base of the style is an | ovary containing one or more ovules | | 12 |
2318397836 | A single carpel or group of fused carpels is called | a pistil | | 13 |
2318399348 | A stamen consists of | a filament topped by an anther with pollen sacs that produce pollen | | 14 |
2318401412 | Complete flowers contain | all four floral organs | | 15 |
2318402248 | Incomplete flowers lack | one or more floral organs, for example stamens or carpels | | 16 |
2318403344 | Clusters of flowers are called | inflorescences | | 17 |
2318717890 | Much of floral diversity represents | adaptation to specific pollinators | | 18 |
2318724671 | Name the Four general trends that can be seen in the evolution of flowers | 1.Bilateral symmetry
2.Reduction in the number of floral parts
3.Fusion of floral parts
4.Location of ovaries inside receptacles; inferior ovaries | | 19 |
2318735747 | The angiosperm life cycle includes | 1.Gametophyte development
2.Pollination
3.Double fertilization
4.Seed development | | 20 |
2318748238 | Female Gametophytes is also known as... | (Embryo Sacs) | | 21 |
2318751638 | The embryo sac, or female gametophyte, develops within | the ovule | | 22 |
2318753383 | Within an ovule, two integuments surround a | megasporangium | | 23 |
2318756242 | One cell in the megasporangium undergoes | meiosis, producing four megaspores, only one of which survives | | 24 |
2318758288 | The megaspore divides without | cytokinesis, producing one large cell with eight nuclei | | 25 |
2318760301 | This cell is partitioned into | a multicellular female gametophyte (7 cells - one big cell with 2 polar nuclei), the embryo sac | | 26 |
2318763220 | Pollen develops from | microspores within the microsporangia, or pollen sacs, of anthers | | 27 |
2318765646 | Each microspore undergoes mitosis to produce two cells: | the generative cell and the tube cell | | 28 |
2318767611 | A pollen grain consists of | the two-celled male gametophyte and the spore wall | | 29 |
2318771213 | In angiosperms, pollination is | the transfer of pollen from an anther to a stigma | | 30 |
2318772055 | After landing on a receptive stigma, a pollen grain produces a | pollen tube that grows down into the ovary and discharges two sperm cells near the embryo sac | | 31 |
2318774468 | Fertilization is... | the fusion of gametes, occurs after the two sperm reach the female gametophyte | | 32 |
2318776638 | Describe the function of the sperm in fertilization | One sperm fertilizes the egg, and the other combines with the two polar nuclei, giving rise to the triploid food-storing endosperm (3n) | | 33 |
2318781518 | Double fertilization ensures that | endosperm only develops in ovules containing fertilized eggs | | 34 |
2318794106 | What happens after double fertilization | -Each ovule develops into a seed
-The ovary develops into a fruit enclosing the seed
-When a seed germinates, the embryo develops into a new sporophyte | | 35 |
2318830589 | The transfer of pollen from anthers to stigma can be accomplished by | wind, water, or animals | | 36 |
2318831724 | Wind-pollinated species (what do they do?) | (e.g., grasses and many trees (nontropical trees) release large amounts of pollen | | 37 |
2318838386 | In apomixis, an embryo is created from | -a diploid cell in the ovule.
-Then the ovules mature into seeds.
Ex. Dandelion | | 38 |
2318850315 | Moth pollinated flowers are usually... | sweetly fragrant, pale colored and open at night | | 39 |
2318858202 | Some pollinators are... | 1. Bees
2. Moth
3.Hummingbirds
4.Blowfly
5. Bats | | 40 |
2318865040 | Coevolution is | the joint evolution of interacting species in response to selection imposed by each other | | 41 |
2318865984 | Many flowering plants have coevolved with | specific pollinators | | 42 |
2318873290 | The development of a seed into a flowering plant includes several stages | 1.Endosperm development
2.Embryo development
3.Seed dormancy
4.Seed germination
5.Seedling development
6.Flowering | | 43 |
2318876642 | Endosperm development usually precedes | embryo development | | 44 |
2318877945 | In most monocots and many eudicots, endosperm stores | nutrients that can be used by the seedling | | 45 |
2318880196 | In other eudicots, the food reserves of the endosperm are | exported to the cotyledons | | 46 |
2318885510 | The first mitotic division of the zygote splits what? | splits the fertilized egg into a basal cell and a terminal cell | | 47 |
2318886931 | The basal cell produces | a multicellular suspensor, which anchors the embryo to the parent plant | | 48 |
2318889482 | The terminal cell gives rise to | most of the embryo | | 49 |
2318893713 | The embryo and its food supply are enclosed by | a hard, protective seed coat | | 50 |
2318894592 | The seed enters a state of | dormancy | | 51 |
2318896742 | A mature seed is only about what percent water? | 5-15% water | | 52 |
2318898443 | In some eudicots, such as the common garden bean, the embryo consists of | the embryonic axis attached to two fleshy cotyledons (seed leaves) | | 53 |
2318900243 | Below the cotyledons the embryonic axis is called | the hypocotyl and terminates in the radicle | | 54 |
2318901434 | the radicle | embryonic root | | 55 |
2318902870 | above the cotyledons it is called | the epicotyl | | 56 |
2318903769 | The plumule comprises | the epicotyl, young leaves, and shoot apical meristem | | 57 |
2318906912 | The seeds of some eudicots, such as castor beans, have | thin cotyledons | | 58 |
2318913282 | Name 2 toxins found in Castor Bean | 1.RCA Ricinus communis agglutinin
-Agglutinates RBCs; does not penetrate intestinal wall
2.Ricin - 1 milligram enough to kill
-Death often within 3-5 days; severe dehydration, decrease in urine; decrease in blood pressure
-Inhibit protein synthesis by irreversibly inactivating ribosomes
-RIPs ribosome inactivating proteins | | 59 |
2318945926 | RTB portion of ricin | -Binds to both glycoprotein and glycolipids.
-106-108 ricin molecules may bind per cell.
-A sing ricin molecule that enters the cytosol can inactivate 1500 ribosomes per minute and kill the cell. | | 60 |
2318962139 | The ricin A portion of the heterodimer is the enzyme that | binds and depurinates a specific adenine of the 28S rRNA | | 61 |
2318966577 | A monocot embryo has | one cotyledon | | 62 |
2318967791 | Grasses, such as maize and wheat, have a special cotyledon called | a scutellum | | 63 |
2318969350 | Two sheathes enclose the embryo of | a grass seed: a coleoptile covering the young shoot and a coleorhiza covering the young root | | 64 |
2318973430 | Seed dormancy increases | the chances that germination will occur at a time and place most advantageous to the seedling | | 65 |
2318974400 | The breaking of seed dormancy often requires | environmental cues, such as temperature or lighting changes | | 66 |
2318977183 | Most seeds remain viable after how long? | a year or two of dormancy, but some last only days and others can remain viable for centuries | | 67 |
2318979082 | Germination depends on | on imbibition, the uptake of water due to low water potential of the dry seed | | 68 |
2318985826 | In Germination what emerges from the seed first? | 1. The radicle
2. Shoot tip | | 69 |
2318993272 | In many eudicots, a hook forms in the What?, and growth pushes the hook above ground | In many eudicots, a hook forms in the hypocotyl, and growth pushes the hook above ground | | 70 |
2318994923 | What causes the hook to straighten and pull the cotyledons and shoot tip up | Light | | 71 |
2319001234 | In other eudicots the an epicotyl hook forms and the cotyledons remain in the soil | In other eudicots the an epicotyl hook forms and the cotyledons remain in the soil | | 72 |
2319005743 | the bean has a (family Fabaceae) | hypocotyl hook | | 73 |
2319006930 | the pea has an (family Fabaceae) | epicotyl hook | | 74 |
2319012552 | In maize and other grasses, which are monocots, the----pushes up through the soil creating a tunnel for the shoot tip to grow through | coleoptile | | 75 |
2319019927 | The flowers of a given plant species are synchronized to appear | at a specific time of the year to promote outbreeding | | 76 |
2319022193 | Flowering is triggered by a combination of | environmental cues and internal signals | | 77 |
2319023349 | A fruit is | the mature ovary of a flower | | 78 |
2319025488 | Function of fruit | It protects the enclosed seeds and aids in seed dispersal by wind or animals | | 79 |
2319033047 | Fruits are classified based on their developmental origin | 1.Simple fruits
2.Aggregate fruits
3.Multiple fruits | | 80 |
2319035136 | Simple fruits develop from | a single or several fused carpels | | 81 |
2319036267 | Aggregate fruits result from | a single flower with multiple separate carpels | | 82 |
2319037058 | Multiple fruits develop from | a group of flowers called an inflorescence | | 83 |
2319044806 | An accessory fruit contains | other floral parts in addition to ovaries | | 84 |
2325766787 | Pome | includes fleshy receptacle or hypanthium (fused bases of stamens, petals and sepals | | 85 |
2325767290 | Fruit dispersal mechanisms include | 1.Water
2.Wind
3.Animals | | 86 |
2325768441 | Asexual reproduction results in | a clone of genetically identical organisms | | 87 |
2325768736 | Mechanisms of Asexual Reproduction | 1.Fragmentation
2.Apomixis | | 88 |
2325768987 | Fragmentation | separation of a parent plant into parts that develop into whole plants, | | 89 |
2325770510 | Apomixis | asexual production of seeds from a diploid cell | | 90 |
2325771857 | Asexual reproduction is also called | called vegetative reproduction because progeny arise from mature vegetative fragments | | 91 |
2325773454 | Asexual reproduction can be beneficial to a successful plant in | -a stable environment
But make plant vulnerable to local extinction if there is an environmental change. | | 92 |
2325776425 | Sexual reproduction generates | genetic variation that makes evolutionary adaptation possible | | 93 |
2325777085 | many species have evolved mechanisms to prevent | selfing | | 94 |
2325777896 | Mechanisms That Prevent Self-Fertilization | 1.Dioecious species
2. Others have stamens and carpels that mature at different times or are arranged to prevent selfing
3.self-incompatibility | | 95 |
2325777897 | Dioecious species | have staminate and carpellate flowers on separate plants | | 96 |
2325779551 | self-incompatibility | a plant's ability to reject its own pollen
*Some plants reject pollen that has an S-gene matching an allele in the stigma cells | | 97 |
2325782135 | Totipotent cells | those that can divide and asexually generate a clone of the original organism, are common in plants | | 98 |
2325784292 | vegetative propagation | Vegetative reproduction that is facilitated or induced by humans | | 99 |
2325784617 | A callus is | a mass of dividing, undifferentiated totipotent cells can sprout shoots and roots in response to plant hormones | | 100 |
2325786242 | Grafting | -A twig or bud can be grafted onto a plant of a closely related species or variety
*The stock provides the root system
*The scion is grafted onto the stock | | 101 |
2325789250 | Transgenic plants are | are genetically modified (GM) to express a gene from another organism | | 102 |
2325791195 | Plant tissue culture also facilitates the production of | of genetically modified (GM) plants | | 103 |
2325792206 | Plants with beneficial mutations are used in | breeding experiments | | 104 |
2325792536 | Desirable traits can be introduced from | different species or genera | | 105 |
2325793517 | biotechnology | The manipulation of living organisms to produce goods and services | | 106 |
2325794614 | the Bt toxin | Some transgenic crops were developed to produce this toxin which is toxic to insect pests | | 107 |
2325797684 | Bt toxin is from | Bacillus thuringiensis, a soil bacterium that produces a crystalline protein that harms the guts of some insect larvae | | 108 |
2325802770 | Biofuels are | fuels derived from living biomass, the total mass of organic matter in a group of organisms | | 109 |
2325803220 | Most long term planners are backing away from | biofuels | | 110 |
2325804123 | Worldwide use of herbicide resistant crops has led in a massive increase | in herbicide use.
-These chemicals are toxic to our primary producers. | | 111 |