Regulate the exchange of gases in and out of the plant‚ and the amount of water lost through the leaves of the plant. Pollen grains – circular cells with an extremely hard protective cell wall containing sperm cells‚ pollen grains germinate when they come in contact with female stamens‚ producing a pollen tube through which the sperm travel to reach the ova (ovary). These pollen tubes can easily be seen in a corn cob. Root hair cell – designed to increase the surface area of the root for absorption
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only one bee‚ the queen‚ within the hive that lays eggs and keeps reproducing. Drone bees‚ or male bees‚ have one purpose and that is to fertilize new queens. Lastly‚ the most essential and largest quantity of bees are the workers. They forage for pollen and nectar‚ contribute to the care of the queen and drones‚ feed larvae‚ protect the hive and perform other task to ensure the survival of the colony. (Lehmann) For as long as bees were created‚ they have been a vital part to this world. Rachel Bale
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Five hundred million years ago‚ the invasion of land was under way. Why then? Astronomical numbers of photosynthetic cells had come and gone‚ and oxygen-producing types had changed the atmosphere. High above Earth‚ the sun’s energy had converted much of the oxygen into a dense ozone layer‚ a shield against lethal doses of ultraviolet radiation. Until then‚ life had not ventured above the surface of water and mud. Algae were evolving at the water’s edge‚ and one group – probably the charophytes
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Next time you are having dinner with your family‚ observe what is on your table. You may see meat‚ vegetables‚ bread‚ and even dessert. These foods may look delicious‚ but would you believe me if I told you all of the food you were consuming was made in a laboratory? These foods are called GMOs‚ genetically modified organisms. The United States Department of Agriculture defines a GMO as an organism that is produced through genetic modification. Scientists change the DNA sequence of organisms to
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1. If there was no ECB infestation in a certain year‚ would a farmer gain or lose financially by planting Bt corn? Explain why. He might lose a little bit‚ but since there is no way to know if there will be an ECB infestation at planting time‚ he might still be better off to use Bt corn. There is almost always a residual number of corn borer and other insects left in the soil‚ even after treating a field‚ so the chances are too high that he might need to spray insecticides to keep the damage
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plant characterized by having one photosynthetic embryonic seed leaf or cotyledons in the seed. Monocotyledonous plants can also be identified:- • When flowers grow‚ as the petals are formed in multiples of three (trimerous). • Each pollen grain of a monocotyledonous plant has one pore. • In the stem of a monocot‚ the vascular bundles are scattered. • The monocot roots are fibrous roots. • In monocots‚ the leaves have parallel venation. Dicotyledonous
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genetic pollution caused by spread of seeds or pollen. As regards pollen contamination from GM varieties and the call for compensation for growers of non-GM or organic varieties whose crops are contaminated‚ if one is to be fair one might reasonably expect growers of non-GM and organic varieties to compensate growers of GM crops if they are contaminated with non-GM or organic pollen. |Genetic pollution from transgenes spreads into other organisms through pollen‚ seeds and microbial processes. It is fundamentally
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an ecosystem which depend on each other allows for a greater chance of survival and perpetuation. This may occur for several reasons‚ for example a bee and a flower. The bee requires the pollen of the flower to make its honey. However‚ while gathering the pollen from the flowers‚ it transfers some of the pollen to female flowers‚ allowing them to make seeds and spawn further generations. However‚ a foreign species may‚ for example‚ eat the bees therefore allowing for decreased fecundity of the flowers
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Biology 1. If an interphase cell is treated with cyanide (a metabolic poison)‚ the cell does not divide by mitosis. However‚ if cyanide is added right after mitosis has started‚ the same cell completes mitosis. Which of the following explains this observation? A. Metabolic activity ceases during mitosis B. Cell division does not require metabolic activity C. Energy required for mitosis is produced and stored in the cell during interphase D. Mitotic cells make factors that make them resistant to
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larger that any bryophyte. Seeds evolved between the vascular plants and provided a means to protect young individuals. Flowers‚ which are the most obvious characteristic of angiosperms‚ guide the activities of insects and other pollinators so that pollen is dispersed rapidly and precisely from one flower to another of The same species‚ thus promoting out crossing. Many angiosperms display other modes of pollination‚ including self-pollination. Evolutionary Origins Plants derived from an aquatic
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