Home
Class 12
BIOLOGY
Assertion : Tropical regions have got a ...

Assertion : Tropical regions have got a long evolutionary time for species diversification as compared to temperate regions.
Reason : Temperate regions have undergone frequent glaciations in the past whereas tropical regions have remained relatively undisturbed for millions of years.

A

a) If both assertion and reason are true and reason is the correct explanation of assertion.

B

b) If both assertion and reason are true but reason is not the correct explanation of assertion.

C

c) If assertion is true but reason is false.

D

d) If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that tropical regions have a longer evolutionary time for species diversification compared to temperate regions. This is based on the idea that tropical regions have been more stable over long periods, allowing for more species to evolve. 2. **Analyzing the Reason**: - The reason provided is that temperate regions have experienced frequent glaciations in the past, while tropical regions have remained relatively undisturbed for millions of years. Glaciation refers to periods when large areas were covered by ice, which can disrupt ecosystems and limit species diversity. 3. **Connecting Assertion and Reason**: - The reason supports the assertion. Frequent glaciations in temperate regions would have led to habitat destruction and a reduction in the time available for species to evolve, resulting in lower species diversity. In contrast, the stability of tropical regions has allowed for prolonged evolutionary processes. 4. **Conclusion**: - Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, the correct option is that both the assertion and reason are true, and the reason is the correct explanation for the assertion. ### Final Answer: - The correct option is **A**: Both assertion and reason are true, and the reason is the correct explanation of the assertion.
### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that tropical regions have a longer evolutionary time for species diversification compared to temperate regions. This is based on the idea that tropical regions have been more stable over long periods, allowing for more species to evolve. 2. **Analyzing the Reason**: - The reason provided is that temperate regions have experienced frequent glaciations in the past, while tropical regions have remained relatively undisturbed for millions of years. Glaciation refers to periods when large areas were covered by ice, which can disrupt ecosystems and limit species diversity. ...
Promotional Banner

Topper's Solved these Questions

  • BIODIVERSITY & CONSERVATION

    NCERT FINGERTIPS ENGLISH|Exercise Biodiversity & Conservation|140 Videos

  • BIODIVERSITY & CONSERVATION

    NCERT FINGERTIPS ENGLISH|Exercise NCERT (EXEMPLAR PROBLEMS|20 Videos

  • BIOTECHNOLOGY - PRINCIPLES AND PROCESSES

    NCERT FINGERTIPS ENGLISH|Exercise Biotechnology - Principles And Processes|139 Videos

Similar Questions

Explore conceptually related problems

What is so special about tropics that might account for their greater biological diversity? a. Unlike temperate regions subjected to frequent glaciations in the past, tropical latitudes have remained relatively undisturbed for millions of years and thus, had a long evolutionary time for species diversification. b. Temperate environments, unlike tropical ones, are less seasonal, relatively more constant and predictable. Such constant environments promote niche specialization and lead to a greater species diversity. c. There is more solar energy available in the tropics, which contributes to higher productivity, this in turn might contribute indirectly to greater diversity.

The temperate regions show a lower value of primary productivity as compared to tropical regions.

Assertion : Lichens are a pioneer community in the temperate region. Reason : Blue-green algae grow as the pioneer community in the tropical region.

Which of the following is not a fundamental reason for greater biodiversity in tropics as compared to that of temperate regions ?

Assertion: Tropical regions are more diversity-rich in comparison to temperate areas. Reason: Availability of more solar energy directly affects the presence of more species in these areas.

Choose how many of the given statement are not correct about the Tropics ? (i) Greater species diversity compared to Temperate (ii) Subjected to frequent glaciations in the past (iii) Great seasonal variations are seen here (iv) Enviornment is relatively constant

Assertion: Tropical plants have a higher optimum temperature for photsynthesis than temperate plants Reason: The temperature optimum for photosynthesis of different plants depends on their habitat.

According to an estimate almost 40 percent forests have been lost in the tropics compared to only 10 percent in the temperate region.

Assertion : PCR primers must not have self complementary regions. Reason : Self complementary regions result in hairpin structures adversely affecting the PCR.