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Test: Ecological Succession (NCERT)


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10 Questions MCQ Test Biology Class 12 | Test: Ecological Succession (NCERT)

Test: Ecological Succession (NCERT) for NEET 2022 is part of Biology Class 12 preparation. The Test: Ecological Succession (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Ecological Succession (NCERT) MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Ecological Succession (NCERT) below.
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Test: Ecological Succession (NCERT) - Question 1

Match column I with column II and select the correct option from the given codes.

Detailed Solution for Test: Ecological Succession (NCERT) - Question 1

Bacteria are important decomposers of ecosystem. Because of their small size, they are also called as micro consumers. Green plants (producers) are also called transducers because they convert light energy into chemical energy.
Primary succession (=Prisere) is the biotic succession that occurs on a previously bare area. Lithosere (or Xerosere) refers | to the sequence of successional stages that occur on bare rock.

Test: Ecological Succession (NCERT) - Question 2

Primary succession occurs on

Detailed Solution for Test: Ecological Succession (NCERT) - Question 2

Primary succession starts from the primitive substratum, where previously there was not any sort of living matter. The first groups of plants establishing there are known as the pioneers, primary community or primary colonisers. Newly formed river delta, newly exposed sea floor, igneous rocks, sand dunes, new cooled lava sediments are some examples of primary bare area. Primary succession takes a long time for completion, several hundred to several thousand years.

Test: Ecological Succession (NCERT) - Question 3

In lithosere, foliose lichens make the conditions favourable for the growth of

Detailed Solution for Test: Ecological Succession (NCERT) - Question 3

In lithosere (xerosere or xerarch), the pioneer community is usually constituted by crustose lichens (e.g., Graphis, Rhizocarpon). Foliose lichens (e.g., Dermatocarpon, Parmelia) kill the crustose lichens by shading them, cause deeper depressions and accumulate more soil particles and organic matter. Foliose lichens make the conditions favourable for the growth of hardy mosses (e.g., Tortula, Grimmia).

Test: Ecological Succession (NCERT) - Question 4

Select the correct sequence of succession in a pond

Detailed Solution for Test: Ecological Succession (NCERT) - Question 4

Series of biotic communities that develop in a newly formed pond or lake is called hydrosere. Various seral stages of hydrosere are:
Planktons (Phytoplanktons and zooplanktons) → rooted submerged hydrophytes → floating hydrophytes → reed swamps → sedges or marsh-meadow stage → woodland stage → climax forest.

Test: Ecological Succession (NCERT) - Question 5

Correct sequence of stages of succession on a bare rock is

Detailed Solution for Test: Ecological Succession (NCERT) - Question 5

The various serai stages of lithosere (succession on bare rock) are as follows:
Lichens (Pioneer community) → Mosses → Annual grasses→ Perennial grasses → Shrubs → Trees (Climax community).

Test: Ecological Succession (NCERT) - Question 6

Read the given statements and select the correct option.
Statement 1: Pioneer community is the stable and final biotic community of an ecological succession.
Statement 2: Pioneer community has maximum diversity and niche specialisation.

Detailed Solution for Test: Ecological Succession (NCERT) - Question 6

Pioneer community is the first community to inhabit an area while the last stable community of an ecological succession is climax community. Climax community has the maximum diversity and niche specialisation.

Test: Ecological Succession (NCERT) - Question 7

In the given figure, A,B,C,D,E and F represent some stages of hydrosere. Select the correct statement regarding these.

Detailed Solution for Test: Ecological Succession (NCERT) - Question 7

In the given figure, A represents submerged stage (e.g., Hydrilla, Potamogeton, Vallisneria, etc.), B represents floating leaved anchored plant stage (e.g., Nymphaea, Nelumbo, Pistia, etc.), C represents reed-swamp stage (e.g., Phragmites, Typha, Scirpus, Sagittaria, etc.), D represents marsh-meadow stage (e.g., Carex, Cyperus, Juncus, etc.), E represents woodland stage (e.g., Salix, Populus, Alnus, etc.) and F represents the climax community of forest (e.g., Acer, Quercus, Ulmus, etc.).

Test: Ecological Succession (NCERT) - Question 8

An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having

Detailed Solution for Test: Ecological Succession (NCERT) - Question 8

If an ecosystem is easily dameged, that means it is not very stable. But since, it recovers fast when the damaging effect stops, it certainly has high resilience.

Test: Ecological Succession (NCERT) - Question 9

During the stages of succession in a given ecosystem, the following changes in characteristics may be observed.

Which one of the characteristics A,B,C,D or E is responsible for the apparent high degree of stability associated with a climax ecosystem?

Detailed Solution for Test: Ecological Succession (NCERT) - Question 9

High species diversity is the most important factor in bringing stability to a climax ecosystem.

Test: Ecological Succession (NCERT) - Question 10

Second stage of hydrosere is occupied by plants like

Detailed Solution for Test: Ecological Succession (NCERT) - Question 10

Second stage of hydrosere is represented by submerged plants. The bottom lined by soft mud having organic matter is favourable for growth of submerged plants like Hydrilla, Potamogeton, Vallisneria abd Najas. They are rooted in the mud and form dense growth.

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