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Standard XII
Biology
Lichens
Q. Consider t...
Question

Q. Consider the following statements regarding ecological succession:

Which of the statements given above is/are correct?


A
1 only
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B
2 only
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C
Both 1 and 2
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D
Neither 1 nor 2
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Solution

The correct option is C Both 1 and 2

Explanation:

Statement 1 is correct: The gradual and fairly predictable change in the species composition of a given area is called ecological succession.

Statement 2 is correct: During succession, some species colonize an area and their population becomes more numerous whereas populations of other species decline and even disappear.


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Q. Identify the incorrect statement.
I. During plant succession, some species colonise an area and populations become more numerous.
II. Secondary succession is a slow process when compared to primary succession.
III. In the successive seral stages, there is no change in the species composition of the ecosystem.
Q. Identify the wrong pair of statements.
I) During plant succession, some species colonise an area and populations become more numerous, whereas populations of other species decline and even disappear.
II) Both hydrarch and xerarch successions lead to mesic conditions.
III) Secondary succession is a slow process when compared to primary succession.
IV) In the successive seral stages, there is no change in the diversity of species of organisms.
Q. Q. Regarding ecological succession, consider the following statements:Which of the statements given above is/are correct?

Q. पारिस्थितिक अनुक्रमण के संबंध में, निम्नलिखित कथनों पर विचार कीजिए:
  1. किसी दिए गए क्षेत्र की प्रजातियों की संरचना में क्रमिक और उचित आंकलित परिवर्तन को क्रमक(sere) कहा जाता है।
  2. समुदायों का संपूर्ण अनुक्रम जो किसी दिए गए क्षेत्र में क्रमिक रूप से परिवर्तित होता है, को पारिस्थितिक अनुक्रमण कहा जाता है।
  3. जलारंभी अनुक्रमण जलमग्न क्षेत्रों में होता है और अनुक्रमण श्रेणी हाइड्रिक से समोदित(mesic) परिस्थिति की ओर अग्रसित होती है।
उपर्युक्त कथनों में से कौन सा/से सही है/हैं?

  1. 1 and 2 only
    केवल 1 और 2

  2. 3 only
    केवल 3

  3. 2 and 3 only
    केवल 2 और 3

  4. 1, 2 and 3
    1, 2 और 3
Q. Identify the wrong pair of statements
I.During plant succession some species colonise an area and populations becomes more numerous whereas populations of other species decline and even disappear
II.Both hydrarch and xerarch successions lead to mesic conditions
III. Secondary succession is a slow process as compared to primary succession
IV.In successive seral stages there is no change in the diversity of species of organisms
Q. Consider the following statements in the context of ecological succession:

1. Lichens are considered a pioneer species.
2. Phytoplanktons act as pioneer species in aquatic ecosystems.

Which of the above are correct?
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