Home
Class 12
BIOLOGY
Assertion : Small sized animals are rare...

Assertion : Small sized animals are rarely found in polar regions.
Reason : Small sized animals have larger surface area relative to their volume and they have to spend much energy to generate body heat through metabolism.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: **Step 1: Understand the Assertion** - The assertion states that small-sized animals are rarely found in polar regions. This is a claim about the distribution of animal sizes in cold climates. **Step 2: Analyze the Reason** - The reason provided explains that small-sized animals have a larger surface area relative to their volume. This means that they lose body heat more quickly than larger animals. **Step 3: Relate the Assertion to the Reason** - In polar regions, where temperatures are low, small animals would struggle to maintain their body heat due to their high surface area to volume ratio. This leads to rapid heat loss. **Step 4: Consider Metabolic Energy Needs** - To compensate for the heat lost, small animals would need to expend a lot of energy to generate body heat through metabolism. This is energetically costly and not sustainable in cold environments. **Step 5: Conclusion** - Therefore, the assertion is correct because small-sized animals are indeed rarely found in polar regions, and the reason provided correctly explains why this is the case. **Final Answer:** - Both assertion and reason are true, and the reason correctly explains the assertion.
### Step-by-Step Solution: **Step 1: Understand the Assertion** - The assertion states that small-sized animals are rarely found in polar regions. This is a claim about the distribution of animal sizes in cold climates. **Step 2: Analyze the Reason** - The reason provided explains that small-sized animals have a larger surface area relative to their volume. This means that they lose body heat more quickly than larger animals. ...
Promotional Banner

Topper's Solved these Questions

  • ORGANISMS AND POPULATION

    NCERT FINGERTIPS ENGLISH|Exercise Organisms And Population|175 Videos

  • ORGANISMS AND POPULATION

    NCERT FINGERTIPS ENGLISH|Exercise NCERT|20 Videos

  • MOLECULAR BASIS OF INHERITANCE

    NCERT FINGERTIPS ENGLISH|Exercise Molecular Basis Of Inheritance|151 Videos

  • PRACTICE PAPERS

    NCERT FINGERTIPS ENGLISH|Exercise Practice paper|150 Videos

Similar Questions

Explore conceptually related problems

Very small animals are rarely found in polar regions because

Very small size animals are rarely found in'

Explain why very small animals are rarely found in polar region.

Assertion:- Very small organisms rarely found in polar regions. Reason:- Small animals have a larger surface area relative to their volume, they tend to lose body heat very fast when it is cold outside.

Read the following statements and select the correct option: (a) Very small animals are rarely found in polar regions. (b) Small animals have a larger surface area relative to their volume, they tend to lose body heat very fast when it is cold outside.

Consider the following statement (A-D) each with one or two blanks. (A) Some snails go into ______(i)_______ to avoid ______(ii)______ related problems (B) Since small animals have a ______(iii)______ surface area relative to their volume, they tend to lose body heat _____(iv)_____ when it is cold outside. (C) Next to temperature , _____(v)_____ is the most ecologically important environment factor. (D) Every ____(vi)_____ the famous keolado National Park in Rajasthan host thousands of migrating birds. Which one of the following option gives the correct fill ups for the respective blank numbers from (i) to (vi) in the statements ?

Heat loss or heat gain is a function of surface area Very ________ animals are rarely found in polar regions.

Assertion (A) : Frenkel defects are shown by AgX . Reason (R ) : Ag^(o+) ions have small size.

Assertion : Polar bodies have small amount of cytoplasm. Reason : It is formed by unequal mitotic division.

Assertion: All clatharate compound of noble gas are the compounds in which the molecules of noble gases are trapped in cavities in te crystal lattice of other compounds. Reason: He and Ne having smaller size do not form clathrate compound molecules because they are small enough to escape from cavities.