Unit 2


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  • Unit 2

    1. 1. Section Two Point Zero By Kelsey Bretin
    2. 2. Why Variation? I think there is variation in all living things because without it we would all be the same and we would all be competing for the same resources but then again there is no food chain so we would all be eating each other. Because seriously who would want to eat Tyler P? ha ha ha just kidding! But then again you wouldn’t know it was Tyler P.
    3. 3. Variation in Plants There are about 400,000 different kinds of plants on our planet. Most variety are in warm climates closer to the equator. This is because plants need light, warmth and water to survive, this is plentiful by the equator. Plants reproduce in both sexual and asexual ways.
    4. 4. Sexual reproducing in Flowers The photo to the left is a cross section of a sexually reproducing flower. The stamen is the male part of the flower, it houses the pollen which is transfered to the stigmas of the same flower or a different one by pollinating animals and insects. The stigma, ovary and ovule are the female parts of the flower. The seeds are made in the ovule after being fertilized by the pollen.
    5. 5. Sexual Reproduction in Animals During sexual reproduction in animals, a male sperm fertilizes a female egg. Once the egg is fertilized it is called a zygote. The cells within the zygote multiply(cleavage) until there are enough to make a fetus.
    6. 6. Asexual reproducing Plants The kinds of asexual reproduction in plants are budding, spore production, binary fusion.
    7. 7. Budding Budding is like the photo in this slide. When a plant buds, a small copy of the parent plant grows on a part of the original plant until it gets big enough and the original plant dies it puts down roots. This is very affective because when the parent plant dies, the nutrients from the rotting material feeds the new plants. Budding in animals is when a single celled or some small multi-celled organisms create a small copy of themselves and it soon detaches from the parent. An example of a budding organism would be yeast, coral or “hens and chicks”.
    8. 8. Spore Production Spores are usually in non-flowering plants, fungi and some moulds. Spores are similar to seeds but they are a small copy of the parent. They develop into a copy of the parenting plant.
    9. 9. Binary Fusion Binary Fusion is when a plant or small animal makes an exact copy of itself. A example of this would be when a bacteria splits and multiplies. This is good for keeping everything similar and since it is asexual there is no risk of inbreeding.
    10. 10. Vegetative Reproduction Vegetative reproduction is when a living piece of a parenting plant becomes separated from the original plant and grows roots and starts a new copy of the original plant. I think this is a hard thing to do in the wild without human help except for the tree aspen, which produces suckers which are easily transfered and grow easily without human help.