The evolution of plants has resulted in increasing levels of complexity‚ from the earliest algal mats‚ through bryophytes‚ lycopods‚ ferns to the complex gymnosperms and angiosperms of today. While the groups which appeared earlier continue to thrive‚ especially in the environments in which they evolved‚ each new grade of organisation has eventually become more "successful" than its predecessors by most measures. Probably an algal scum formed on land 1‚200 million years ago. In the Ordovician period
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Pharmacologyonline 3: 64-72 (2006) Newsletter ROLE AND SCOPE OF ETHNOMEDICAL PLANTS IN THE DEVELOPMENT OF ANTIVIRALS Debprasad Chattopadhyay ICMR Virus Unit‚ ID & BG Hospital‚ GB 4‚ First floor‚ 57 Dr. Suresh C Banerjee Road‚ Beliaghata‚ Kolkata 700 010‚ India. Summary Ethnomedicinal plants have been used as source of drugs for almost all diseases‚ but none are used against viruses probably because there are a very few specific viral targets for natural molecules to interact. Most
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study the transpiration of a leafy shoot using the bubble potometer * Materials and apparatus: * Bubble potometer * Leafy shoot * Scissors * Basin with water * A fan * Plumbing tape * Method: Normal Condition: 1. The bubble potometer was filled with water. 2. The stem of a leafy shoot was cut under water. 3. The bottom of the stem was wrapped by plumbing tape. 4. The stem was fitted onto the photometer under the water. 5. The plant was allowed
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Excellent; I couldn’ t have written a better paper myself. DIVERSITY OF PLANTS Plants evolved more than 430 million years ago from multicellular green algae. By 300 million years ago‚ trees had evolved and formed forests‚ within which the diversification of vertebrates‚ insects‚ and fungi occurred. Roughly 266‚000 species of plants are now living. The two major groups of plants are the bryophytes and the vascular plants; the latter group consists of nine divisions that have living members. Bryophytes
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Chapter 37: Water and sugar transport in plants Water moves from areas of high water potential to areas of low water potential. Water’s potential energy in plants is a combination of (1) it’s tendency to move in response to differences in solute concentration and (2) the pressure exerted on it Plants do not expend energy to replace water that is lost to transpiration when stomata are open and photosynthesis is occurring. Instead‚ water moves from soil and roots to leaves long a water potential
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Transport in Plants Introduction In this lab experiment‚ we set out to examine the different transpiration rates of a plant system in certain environments. Water is transported in a plant by the process of transpiration‚ which is the loss of water through evaporation from the surface of leaves. The stomata in leaves are responsible for the diffusion of water vapor. Transpiration brings water upward through the xylem in the plant. There are certain factors that can affect transpiration rates in
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Abstract The hypothesis states that plants respire at a faster rate if they are exposed to wind‚ opposed to no wind. This was tested by putting one plant in water in front of a fan and the other plant in water‚ but with no fan. The results showed that the plant in front of the fan transpired more. However‚ since the plant blew cold air it affected the rate of transpiration and altered the experiment. Overall‚ this experiment supports the hypothesis that wind makes plants transpire more.
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leafy object. Trees and flowers or generally‚ they are known as plants. A very good morning to all! Today‚ I would like to enlighten everyone in this room about the benefits of plants. Why do you see them everywhere you go? How do they benefit us? Well‚ the floras are a very crucial object to this planet’s survival and all its living things. However‚ today‚ I would like to focus on the benefits if plants towards us‚ human beings. Plants provide oxygen for us‚ supply us with materials to be used on
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PLANT RESPONSES TROPISM is a biological phenomenon‚ indicating growth or turning movement of a biological organism‚ usually a plant‚ in response to an environmental stimulus. In tropisms‚ this response is dependent on the direction of the species. The word tropism comes from the Greek trope ("to turn" or "to change"). Tropisms are usually named for the stimulus involved and may be either positive (towards the stimulus) or negative (away from the stimulus). Phototropism is the growth response
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should be able to answer the following learning outcomes: Big Idea 1 The biological processes occurring in plants Essential question(s) you should ask yourself while studying this part of the topic: What is the life cycle and structure of a plant? Understand the life cycle of a plant Describe the structure and function of parts of the plant Describe the transport of water through a plant Why are leaves‚ flowers and seeds important? Describe the process of photosynthesis Explain the importance
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