B3.1 rhythms

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  • Circa ‘about’ dies ‘day’ Latin
  • B3.1 rhythms

    1. 1. Biological Rhythms This is something a plant or animal does periodically (maybe daily, monthly or yearly).
    2. 2. Rhythms WALT: To understand how circadian rhythms work in living organisms. WILF: State what a circadian rhythm and list examples. (C) Describe examples of circadian rhythms for both plants and animals. (B) Explain the importance of photoperiodism in plants. (A/A*) Keywords Circadian rhythm Biological clock Hormones Germinate Photoperiodism
    3. 3. Circadian Rhythms A biological rhythm that happens daily. How? Your biological clock. e.g. melatonin (hormone) Makes you feel sleepy. More of this hormone is released around 10pm whilst levels decrease in the morning, helping you to wake up.
    4. 4. Circadian Rhythms A biological rhythm that happens daily. How? Your biological clock. e.g. Jet lag Moving east or west around the globe our day to night cycle will either be earlier or later.
    5. 5. 1.A circadian rhythm is… 2.What is a biological clock and where is it found? 3.Describe 2 examples of a human circadian rhythm. Aim Higher! A/A* The data shown looks at the concentration of melatonin against time. Describe the relationship between these two variables. Time 14:00 17:00 20:00 23:00 02:00 05:00 07:00 Blood melatonin concentration (picograms/ml) 8 9 11 28 69 67 9
    6. 6. Plants have the rhythm too! Plants also have circadian (daily) rhythms. e.g. flowers opening in the day and closing at night Day Night
    7. 7. Photoperiodism This is the response of a plant that changes as the length of day changes. Examples Reproduction (Flowering) Germination Growth Use page 29 to describe when and why these examples happen.
    8. 8. 3, 2, 1! State 3 keywords you have learnt today . Name 2 examples of circadian rhythms. Describe 1 example of photoperiodism.
    9. 9. Photoperiodism Photoperiodism Photoperiodism is the way a plant responds to the of a day. A plant that flowers in the autumn is called a -day plant. During the shorter days of plants may not grow at all. As the days get longer in spring, __ germinate and start to grow. During spring and summer a plant will faster. A long-day plant flowers as the days get longer in the months. Photoperiodism is the way a plant responds to the of a day. A plant that flowers in the autumn is called a -day plant. During the shorter days of plants may not grow at all. As the days get longer in spring, __ germinate and start to grow. During spring and summer a plant will faster. A long-day plant flowers as the days get longer in the months. Photoperiodism Photoperiodism Photoperiodism is the way a plant responds to the of a day. A plant that flowers in the autumn is called a -day plant. During the shorter days of plants may not grow at all. As the days get longer in spring, __ germinate and start to grow. During spring and summer a plant will faster. A long-day plant flowers as the days get longer in the months. Photoperiodism is the way a plant responds to the of a day. A plant that flowers in the autumn is called a -day plant. During the shorter days of plants may not grow at all. As the days get longer in spring, __ germinate and start to grow. During spring and summer a plant will faster. A long-day plant flowers as the days get longer in the months.

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