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12th Biology Monthly Test - 2 ( Botany - Ecosystem )

St. Britto Hr. Sec. School - Madurai

12th Biology Monthly Test - 2 ( Botany - Ecosystem )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Arrange in order based oli process of succession.

(i) Climax
(ii) Competition
(iii) Reaction
(iv) Invasion
(v) Nudation
(vi) Ecesis

Nudation, Invasion, Ecesis, Aggregation, Competition, Reaction, Climax
Invasion, Aggregation, Competition, Ecesis, Nudation, Reaction, Climax
Climax, Competition, Reaction, Invasion, Nudation, Ecesis
Aggregation, Climax, Competition, Nudation, Invation, Reaction, Ecesis

Ten percent law was proposed by ____________

Elton
Thienemann
Lindeman
Odum

TDF stands for ________

Tropical dry evergreen forests
Total dry evergreen forests
Tamilnadu dry evergreen forests
Throughout dry evergreen forests

_____________is a lentic ecosystem.

pond
stream
seas
rivers

Which one of the following is called artificial ecosystem

Rice field
Maize field
Pond
Both a and b

Solar energy used by green plants for photosynthesis is only

2 – 8%
2 – 10%
3 – 10%
2 – 9%

Which of the following are not regulating services of ecosystem services
i) Genetic resources
ii) Recreation and aesthetic values
iii) Invasion resistance
iv) Climatic regulation

i and iii
ii and iv
i and ii
i and iv

Ecosystem consists of

decomposers
producers
consumers
all of the above

The following diagram represents

pyramid of number in a grassland
ecosystem
pyramid of number in a grassland ecosystem
pyramid of number in a pond ecosystem
pyramid of biomass in a pond ecosystem

An ecosystem which c~m be easily damaged but can recover after some time if damaging effect stops, will be having.

High stability and low resilience
Low stability and low resilience
High stability and high resilience
Low stability and high resilience

Ecosystem consists of

decomposers
producers
consumers
all of the above

_________is a blue carbon ecosystem

Ocean
Forest
Lakes
Mangroves

Solar energy used by green plants photosynthesis is only

2 -8%
2- 10%
3 - 10%
2-9%

Pond is a type of

forest ecosystem
grassland ecosystem
marine ecosystem
fresh water ecosystem

Which of the following is expected to have the highest value (gm^-2yr^-1) in a grassland ecosystem?

Tertiary production
Gross production
Net production
Secondary production

Part - B

Generic 2 - Answer All Question

Name the common .plants present in fresh water swamp forests.
Define decomposition.

Define productivity.

What are producers?

How many types of forest vegetation are seen in India?

What are consumers?

Pyramid of energy is always upright. Give reasons

Discuss the gross primary productivity is more efficient than net primary productivity.

Part - C

Generic 3 - Answer All Question

Compare primary and secondary succession.

What is food-web?

What is plant succession?

What is Nudation?

Generally human activities are against to the ecosystem, where as you a student how will you help to protect ecosystem?
How are aquatic ecosystem classified?

What is mineralisation?

Give the outline classification of plant succession.

Part - D

Generic 5 - Answer All Question

Generally in summer the forest affeted by natural frre. Over a period of time it recovers itself by the process of successions. Find out the types of succession and explain.

Name of the food chain which is generally present in all type of ecosystem. Explain and write their
significance.

Draw a pyramid from following details and explain in brief. Quantities of organisms are given-Hawks-50, plants-IOOO.rabbit and mouse-250 + 250, pythons and lizard-100 +50 respectively.

Write a note on the types of succession.

Draw a pyramid from following details and explain in brief.
Quantities of organisms are given-Hawks-50, plants-1000.rabbit and mouse-250 +250, pythons and lizard- 100 + 50 respectively.
Shape of pyramid in a particular ecosystem is always different in shape. Explain with example.

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