12th Standard Syllabus & Materials
12th Standard
TN 12th English Poem - 6 - Incident of the French Camp Sample Question Papers Study Material - QB365 Set A
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TN 12th English Prose - 6 - On the Rule of the Road Sample Question Papers Study Material - QB365 Set A
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TN 12th English Prose - 5 - The Chair Sample Question Papers Study Material - QB365 Set A
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TN 12th English Supplementary - 4 - The Midnight Visitor Sample Question Papers Study Material - QB365 Set A
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TN 12th English Poem - 4 - Ulysses Sample Question Papers Study Material - QB365 Set A
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TN 12th English Prose - 4 - The Summit Sample Question Papers Study Material - QB365 Set A
Published on: 13/05/2022
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latest Creative QuestionsDownload Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Biology Test1.
Fruit Dies(Drosophila melanogaster) are the most widely used genetic tool by molecular geneticists. The life cycle of a fruit fly completes within a time span of 15 days. Calculate the death rate if 12 individuals in a laboratory population of 148 fruit Diesdied during a particular week
2.
Name the kind of interaction in the following pairs.
(a) Shark and Suckerfish
(b) Cat and Rat
(c) Lion and Deer
3.
a) What is pedosphere?
b) What is soil profile?
4.
What is phototropism?
5.
How is the camel able to withstand desert conditions?
1.
Death rate (d) = \(\frac { number\ of\ deaths\ per\ unit\ time }{ average\ population } \)
Death rate (d) = \(\frac { 12 }{ 148 } \)
Death rate = 0.08 individuals per fruit fly per week.
2.
(a) Commensalism
(b) Amensalism
(c) Predation
3.
(i) Pedosphere: The soil zone is known as pedosphere.
(ii) Soil profile: Soil is formed of many horizontal layers called soil profile.
4.
The growth or orientation of an organism in response to light, either towards the source of light (positive phototropism) as seen in sunflower, or away from light (negative phototropism) as in case of the root of plants
5.
(i) The camel is able to use water efficiently and effectively for evaporative cooling through their skin and respiratory system.
(ii) They excrete highly concentrated urine and can also withstand dehydration up to 25% of the body weight.
(iii) The hoofs and hump are also suitable adaptations for survival in this dry sandy environment.
12th Standard Syllabus & Materials
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Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
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