Operation biology
Blog for students of biology
Jan 22, 2023
Class 12 practical video
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
Malaria is caused by four strains of plasmodium viz , vivax , ovale, malariae, falciparum
Infection is via sporozoites stage which inhabit salivary gland of mosquito vector
Sporozoites first infect liver , get differentiated into merozoites which infect blood cells as seen in slide provided
Amoeboid , signet ring stage are seen in blood slide
Parasite live and feed inside RBC .
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Ascariasis
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It is caused by Ascaris lumbricoides
It affect small intestine of man
It get entry into gut via contaminated food or water
It hatches from egg ingested along with food or water
It feed on intestinal cells causes abdominal pain , vomiting , cramps , leading to loss of blood , blockage of gut .
Date sheet class 12 science
Date sheet class 12 science
24 Feb - English core
28 Feb - Chemistry
06 March - Physics
11 March - Maths
13 March - Phy Ed
16 March - Biology
23 March - Comp SC
Test for practice
In this test link you are supposed to use your Google account to open the Google form link
Jan 19, 2023
Biology practical new section coming soon
Hello students soon a new section is being introduced regarding biology practicals and project work . This will reduce the burden on students who search on internet to complete their project work .
Core experiments for class 12 Biology
1. Comparing the soil water holding capacity of two given soil samples .
2. Comparing pH of two soil samples
3. Comparing two water samples for pH , turbidity , presence of organisms
4. Comparing two places for suspended particulate matter
5. Calculating population density and frequency with quadrate method
6. Study cell division in living tissue provided
7. Extracting DNA from vegetables and fruits
8 . Study pollen germination in seasonal flowers
9. Study mendelian ratio by using colored seeds.
Class 11 biology practicals
1. Study of plants families with the help of flower specimens
2. Study of transverse and longitudinal section of stem, leaves and roots of selected angiosperms
3. Study of osmosis in plant and animals
4. Study of stomatal distribution in leaves
5.Study of transpiration with the help of cobalt chloride.
6. Extracting the pigments of plant Leaf by chromatography
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Kingdom Fungi video lecture
Pl click on the link for video lectures on Kingdom Fungi https://youtu.be/CBwfBDcFYF4 Part 2 Kingdom Fungi Link for part 2 lecture
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