Students ,
You can just click link given below and see good videos by biologists on practical in biology for class 12 cbse
1. स्पॉटिंग कैसे करें (Spotting kaise kare)
5b.Population density & frequency
6. Suspended particulate matter
8. Viva voce how to speak and answer the questions
Hydrilla plant comments on its aquatic adaptation
🌱Hydrilla verticillata is a submerged, rooted aquatic plant that can grow in water up to depths of 20 ft.
They have tiny leaves with serrations along their margins.
The leaves are grouped together in a bunch.
They have slender, long and spongy stems that move freely along the water current.
Stomata are absent as no transpiration occurs inside water .
Hydrilla lacks cuticle as they are found inside water no need to prevent any water - loss.
The plant body produce mucilage to prevents it from rotting.
Aerenchyma tissue provide buoyancy to plants
Vallisneria Aquatic adaptation
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Leaves of vallisneria are thin and long tape-like to sustain plant in water and absorb maximum light .
Their leaves lack stomata.
The hydrophytes have aerenchyma cells to help in buoyancy.
In Vallisneria, pollination and fertilisation occurs with the help of water . This is called hydrophilly.
Rohu fish
Comments on aquatic adaptations
1. Streamline shape to move through water with least resistance
2. Gills covered by operculum for respiration
3 . Different types of fins for swimming
4. Mucus on surface to prevent wetting of skin
Pathology slides
A. Plasmodium
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Ascariasis
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