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manoj biology project.pdf

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manoj biology project.pdf

  1. 1. BIOLOGY INVESTIGATORY PROJECT R.MANOJ 12TH STD
  2. 2. STUDY OF DISPERSAL OF SEED BY VARIOUS AGENCIES.
  3. 3. INTRODUCTION  The process of scattering of fruits and seeds to distant places away from their parent is calle dispersal on dissemination. It provides the new plants better chances of obtaining water, nutrient light and space thereby enabling them to have a better start in life.The fruits and seeds develop many devices for better dispersal through different agenciesThe principal agencies that aid in the dispersal of fruits and seeds are wind (anemochory), wit(hydrochory) and animals including man (zoochory). Besides, some plants show self dispersal by explosimechanism (autochory). The dispersal through the agency of animals is consideredas the best and msuccessful method. Dispersal of seeds and fruits is quite interesting subject of natural phenomenonandhence the study of dispersal of seeds by various agencies has been selected for the present project.
  4. 4.  AIM: Study the disperal of seed by various agent. MATERIAL REQUIRED: Different types of seeds and fruits, knife, foreceps, petridishes, hand lens etc.
  5. 5.  PROCEDURE:  1. Collect different types of seeds and observe their features carefully, classifythem according ttheir mode of dispersal.  Similarly cut open different types of fruits, note down the features of their seeds and classify them according to their mode of dispersal.  Record your observation in the form of a table .
  6. 6. TYPES OF SEED DISPERSAL  Seed Dispersal by Wind.  Seed Dispersal by Water.  Seed Dispersal by Animal.  Seed Dispersal by Insect.  Seed Dispersal by Explosions.
  7. 7. SEED DISPERSAL BY WIND (anemochory)  The wind is the natural andfundamental means of seeddispersal in the plant kingdom.  This process of dispersal is mainly seen in those plants which bear very light seeds.  The seeds of the orchid plant, dandelions, swan plants, cottonwood tree, hornbeam, ash, cattail, willow herb, are all examples
  8. 8. SEED DISPERSAL BY WATER (hydrochory)  In this method of seed dispersal, seeds float away from their parent plant.  These are mainly seen in those plant which lives in water or nearby the water bodies like beaches, lakes, ponds etc.  Coconut, palm, mangroves, water lily, water mint, are a few examples of plants whose seed are dispersed by the water.
  9. 9. SEED DISPERSAL BY ANIMAL (ZOOCHORY)  Seeds can be transported on the outside of vertebrate animals (mostly mammals), a proces known as epizoochory.  epizoochorous transport can be highly effective if seeds attach to wide- ranging animals.  The seed of these plants gets attached on the fur of animals with the help of these hooks and are carried away to different places, far from their parent plants.  large animal seed dispersers (such as chimpanzees, toucans and hornbills) may disperse large seeds with few other seed dispersal agents
  10. 10. SEED DISPERSAL BY INSECT  Insects are very active during the day and visit a variety of wildflowers.  These are less efficient than bees at moving pollen between plants.  Insects probe for nectar, their flight fuel, and typically favor the flat, clusteredflowers that provide a landing pad and abundant rewards.
  11. 11. SEED DISPERSAL BY EXPLOSIONS  Explosions in fruits literally refer to bursting with all its energy.  In this case, as the fruits get ripened, it shoots out its seeds into the external environment.  This type of seed dispersal is mainly seen in those plants havingpods.  Okra, Lupins, gorse, and broom are a few examples of plants whose seeds are dispersed by Explosions.
  12. 12. OBSERVATION: PLANT 1.Impatiens(balsam) 2.viola(plansy) 3. Acer (Maple), Hopea, Tecoma, Haloptelia (Chilbil), Shorea (Sal), Elm, Moringa,Jacaronida, Cinchoria,Albizia (Siris),Dalbergia (Shisham) etc. Characteristics of seeds/fruits Capsular fruit, mature fruit burst open with force when touched and seeds are shot severalfeet away. Fruit capsule, tension developsin the drying wall of the carpels causing the fruit to burst open along mechanismthe line of dehiscence. Thin, wing like expansions are present in seeds/ fruits, Wings providelarge surface area to the wind for their dispersal. Mode of dispersal/external agency Autochory/explosivemechanism. Autochory/explosivemechanism. Anemochory/dispersalby wind.
  13. 13. plant 4. Chenopodium (Bathua),Polygonum. 5.Boerhaavia,Plumbagocleome 6.Ficus(Banyan and pipal tree). 7.Crop plants (cereals,pulses,spices etc. Charecteristics of seed /fruits Seed/Fruit verylight, float on the surface of water. Fruits are sticky and can stick to the body of Zoochory animals. Fruit edible, chiefly eaten by birds, seeds released unharmed with faeces. Fruits/Seeds haveeconomic importance. Mode of dispersal/externak agency Hydrochory/dispersalby water. Zoochory/dispersal by animal. zoochory/dispersal by bird. Zoochory/dispersal by man.
  14. 14. CONCLUSION: Seeds have the ability to germinate in the presence of moisture, air, and light under the right temperature, even in the absence of soil. If you are interested in knowing more about seed germination, you can repeat the same experiment but keep the bag in a dark place instead of placing it in light.

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