Home
Class 12
BIOLOGY
A: Niche become general and broader duri...

A: Niche become general and broader during biotic succession.
R: Species diversity increases but organic matter is decreased.

A

If both Assertion &Reason are true and the reason is the corect explanation of the assertion , then mark (1)

B

If both Assertion & Reason are true but the reason, is not the correct explanation of the assertion , then mark (2)

C

If Assertion is true statement but Reason is false , them mark (3).

D

If both Asseration and Reason are false statements , then mark (4).

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion (A) and the reason (R) provided. ### Step-by-Step Solution: **Step 1: Analyze the Assertion (A)** The assertion states: "Niche becomes general and broader during biotic succession." - Biotic succession refers to the process by which ecosystems change and develop over time. During this process, different species replace one another. - Initially, a niche may be occupied by a specific species, but as succession progresses, more species may occupy similar niches, leading to a broader niche. - However, the assertion claims that the niche becomes general and broader, which is misleading. In reality, niches can become more specialized as different species adapt to specific roles within the ecosystem. **Conclusion for Assertion (A):** The assertion is **false**. **Step 2: Analyze the Reason (R)** The reason states: "Species diversity increases but organic matter is decreased." - During biotic succession, it is generally observed that species diversity tends to increase as new species colonize the area. - However, the claim that organic matter decreases is incorrect. As species die and decompose, their organic matter contributes to the ecosystem, typically leading to an increase in organic matter over time. **Conclusion for Reason (R):** The reason is also **false**. **Step 3: Combine the Conclusions** Since both the assertion and the reason are false, we can conclude that the correct answer is that both A and R are false. ### Final Answer: Both assertion and reason are false. ---
Promotional Banner

Topper's Solved these Questions

  • ECOSYSTEM

    AAKASH INSTITUTE|Exercise Assignment (Section C)|65 Videos

  • DIGESTION AND ABSORPTION

    AAKASH INSTITUTE|Exercise Assignment (SECTION-D Assertion - Reason Type Questions )|10 Videos

  • ENVIRONMENTAL ISSUES

    AAKASH INSTITUTE|Exercise ASSIGNMENT SECTION D|15 Videos

Similar Questions

Explore conceptually related problems

Species diversity generally increases as one proceeds from

During an ecological succession, many changes occur. Select the wrong statement with respect to succession. (i) Some species colonies and some species disappear (ii) Diversity will not change during succession. (iii) The total biomass increases . (iv) The species number increases.

Assertion: During an ecological succession, the number of species increases, the community biomass increases and the community's ratio of respiration to photosynthesis also increases.

Consider the following statements with respect to patterns of biodiversity . A. With very few exceptions, tropics (Iatitudinal range of 23.5^(@)N to 23.5^(@) S ) harbour more species than temperate or polar areas. B. In general, species diversity increases as we move away from the equator towards the poles . C. The diversity of plants and animals is uniform throghout the world but shows a rather even distribution . D. The largely tropical Amazonian rain forest in South America has the greatest biodiversity on earth. Of the above statements :

Which of the following structural characters of community, changes during succession ? (a) Solar energy use efficiency (b) Species diversity (c) Nutrient conservation (d) Complexity of food web (e) Species composition

Identify the correct match . 1. Stratification : Vertical distribution of different species occupying different levels . 2. Secondary productivity : Amount of biomass or organic matter produced per unit area over a time period by plant during photosynthesis . 3. Primary productivity : Rate of formation of new organic matter by consumers . 4 Decomposition : Break down complex organic matter into inorganic substances like carbon dioxide , water and nutrients