EASY
12th Tamil Nadu Board
IMPORTANT
Earn 100

What is Albedo effect and write their effects ?

Important Questions on Principles of Ecology

MEDIUM
12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 6 - Principles of Ecology>Evaluation>Q 30
The organic horizon is generally absent from agricultural soils because tilling, e.g., plowing, buries organic matter. Why is an organic horizon generally absent in desert soils ?
HARD
12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 6 - Principles of Ecology>Evaluation>Q 31
Soil formation can be initiated by biological organisms. Explain how?
HARD
12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 6 - Principles of Ecology>Evaluation>Q 32
Sandy soil is not suitable for cultivation. Explain why?
MEDIUM
12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 6 - Principles of Ecology>Evaluation>Q 33
Describe the mutual relationship between the fig and wasp and comment on the phenomenon that operates in this relationship.
EASY
12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 6 - Principles of Ecology>Evaluation>Q 34
Lichen is considered as a good example of obligate mutualism. Explain.
MEDIUM
12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 6 - Principles of Ecology>Evaluation>Q 35
What is mutualism? Mention any two example where the organisms involved are commercially exploited in modern agriculture.
MEDIUM
12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 6 - Principles of Ecology>Evaluation>Q 36
List any two adaptive features evolved in parasites enabling them to live successfully on their host?
MEDIUM
12th Tamil Nadu Board
IMPORTANT
Biology Botany Standard 12>Chapter 6 - Principles of Ecology>Evaluation>Q 37

Mention any two significant roles of predation plays in nature.