How To Fish N Plants Breathe
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How To Fish N Plants Breathe






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How To Fish N Plants Breathe How To Fish N Plants Breathe Presentation Transcript

  • - How do they breathe?
    • Just like animals, plants need to breathe too…
    • Do plants have lungs?
    • Do plants have gills?
    • Then how do they breathe?
  • How do Plants breathe?
    • Gases such as oxygen and carbon dioxide enter or leave a plant through tiny holes called stomata (singular – stoma).
    • They are mostly found on the underside of its leaves and on its stems.
  • Stomata
    • There are about 20-1000 stomata per mm 2 of the leaf, depending on the type of plants.
    • The highest number of stomata is found on the leaves of the Spanish oak tree. There are around 1200 stomata per mm 2 .
    • During the day, the stomata are usually open so that carbon dioxide which is needed to make food, can enter the plant.
    • At the same time, excess oxygen produced by the plant also leaves the plant through its stomata.
    • At night, when the plant is not making food, oxygen enters and carbon dioxide leaves the plant through its stomata.
    • Remember…
    • oxygen is needed at all times for respiration, even when the plant is making food!
  • Cross-sectional view of the leaf
  • Open stoma Closed stoma
    • The roots of a plant also need oxygen which they obtain from the air spaces in the soil.
    • Do you know…
    • If you give too much water to a plant in a pot you could kill the roots by drowning them!
  • Mangrove Plants
    • In order to breathe in mud, mangrove trees snorkel for air. They develop air-breathing roots which take in air aboveground.
    • These roots have special tiny pores on their surface to take in air. Only air can enter these pores, not water or salts.
    The roots also contain large air spaces that can store air. During high tide, when the roots are below water, there is still a ready supply of oxygen.
  • - How do fish breathe?
    • Animals living in underwater have no problem in removing carbon dioxide because it dissolves very easily in water. Their problem is how to obtain enough oxygen .
    The amount of oxygen dissolved in the water depends upon the water temperature but, in general, if the water is at 15°C there is 30 times more oxygen in the air than in water.
    • Fish breathe by using GILLS .
    • Gills are found on either side of its heads.
  • Gills
    • The gill is made up of tiny flaps that are rich in blood.
    • These flaps increase the surface area of the gills.
    • The large surface area and the many blood vessels enable the fish to absorb more oxygen from the water.
    - A Fresh Gill
  • - A Spoiled Gill
    • oxygen present in the water is absorbed into the blood vessels through the gills.
    • carbon dioxide is removed from the blood vessels through the gills.
    As water passes over the gills of a fish,
    • The water that enters the mouth of a fish has more oxygen than the water leaving the fish.
    • The water that flows out of the gills of a fish has more carbon dioxide than the water entering the fish.
  • How Do Mudskippers Breathe?
    • In water , mudskipper breathe through gills like other fishes.
    • Out of water , mudskippers can hold water in enlarged gill chambers which lock shut on land.
    • When the oxygen in the water runs out, they have to replenish the used water in their gill chambers with fresh water, so they cannot stay far from water.
    • Mudskippers also absorb air through their skin which is rich with blood vessels, so long as the skin remains moist .