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

St. Britto Hr. Sec. School - Madurai

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

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Identify the possible link "A" in the following food chain
Plant \(\rightarrow\) Insect \(\rightarrow\) Frog \(\rightarrow\) "A" \(\rightarrow\) Eagle

Cobra
Parrot
Rabbit
Eagle

Secondary succession takes place on/in

bare rock
degraded forest
newly created pond
barren lands

Which one the following is not a sedimentary biogeochemical cycle in ecosystem?

Calcium
Carbon cycle
Sulphur cycle
Phosphorus cycle

Which of the following is not a sedimentary cycle

Nitrogen cycle
Phosphorous cycle
Sulphur cycle
Calcium cycle

Pond ecosystem is

not self sufficient and self regulating
partially self sufficient and self regulating
self sufficient and not self regulating
self sufficient and self regulating

Ecosystem consists of

decomposers
producers
consumers
all of the above

The upright pyramid of number is absent in

Lake
Grassland
Pond
Forest

Significance of food web is I are

it does not maintain stability in nature
it shows patterns of energy transfer
it explains species interaction
b and c

Solar energy used by green plants photosynthesis is only

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

Plants such as Albizzia, Acacia and Capparis are the examples of tropical

Grass lands
thorn forests
decidiuous forests
evergreen forests

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?

Plant \(\rightarrow\) Mice \(\rightarrow\) Snake \(\rightarrow\) Peacock

0.02 J
2.5 J
5 J
0.0002 J

About 70% of total global carbon is found in

Forests
grasslands
agroecosystem
Oceans

The term 'ecosystem' was proposed by __________

S. A. Forbes
Vernadsky
A. G. Tansley
Odum

Which of the following is not a abiotic component of the ecosystem?

Bacteria
Humus
Organic compounds
Inorganic compounds

Pond is a type of

forest ecosystem
grassland ecosystem
marine ecosystem
fresh water ecosystem

Part - B

Generic 5 - Answer All Question

Write a note on the types of succession.

Explain in detail about "First law of thermodynamics".
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.

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

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.

Write about the significance of plant succession.

Various stages of succession are given below. From that rearrange them accordingly. Find out the type of succession and explain in detail. Reed-swamp stage, phytoplankton stage, shrub stage, submerged plant stage, forest stage, submerged free floating stage, marsh medow stage.

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