Home
Class 12
BIOLOGY
Select the correct statement from the fo...

Select the correct statement from the following:

A

Mutations are random and directional

B

Darwinian variations are small and directionless

C

Fitness is the end result of the ability to adapt and get selected by nature

D

All mammals except whales and camels have seven cervical vertebrae

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to evaluate each of the provided statements and determine which one is correct. ### Step-by-Step Solution: 1. **Evaluate Option A**: "Mutations are random and directional." - **Analysis**: Mutations occur randomly and are not directional. They can lead to various outcomes, but they do not follow a specific direction or pattern. - **Conclusion**: This statement is incorrect. 2. **Evaluate Option B**: "Darwinian variations are small and directionless." - **Analysis**: Darwinian variations refer to the small changes that occur in populations over time. While these variations can be small, they are not necessarily directionless as they can lead to adaptations that are beneficial for survival. - **Conclusion**: This statement is incorrect. 3. **Evaluate Option C**: "Fitness is the end result of the ability to adapt and get selected by nature." - **Analysis**: This statement accurately describes the concept of fitness in evolutionary biology. Fitness refers to an organism's ability to survive and reproduce in its environment, which is indeed a result of adaptation and natural selection. - **Conclusion**: This statement is correct. 4. **Evaluate Option D**: "All mammals except whales and camels have seven cervical vertebrae." - **Analysis**: This statement is incorrect. Most mammals, including humans, have seven cervical vertebrae, but manatees are an exception, not whales and camels. - **Conclusion**: This statement is incorrect. ### Final Answer: The correct statement is **Option C**: "Fitness is the end result of the ability to adapt and get selected by nature." ---
To solve the question, we need to evaluate each of the provided statements and determine which one is correct. ### Step-by-Step Solution: 1. **Evaluate Option A**: "Mutations are random and directional." - **Analysis**: Mutations occur randomly and are not directional. They can lead to various outcomes, but they do not follow a specific direction or pattern. - **Conclusion**: This statement is incorrect. ...
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • EVOLUTION

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS)(B. MATCHING TYPE QUESTIONS )|4 Videos

  • EVOLUTION

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) (C.ASSERTION REASON TYPE QUESTIONS:)|15 Videos

  • EVOLUTION

    MODERN PUBLICATION|Exercise REVISION EXERCISES-(VI. LONG ANSWER TYPE QUESTIONS )(Five mark each)(B. QUESTIONS FROM CBSE EXAMINATIONS :)|6 Videos

  • ECOSYSTEM

    MODERN PUBLICATION|Exercise Chapter Practice Test (Section - D) (Case - Based Short Answer Type Questions)|5 Videos

  • HUMAN HEALTH AND DISEASES

    MODERN PUBLICATION|Exercise Chapter Practice Test|2 Videos

Similar Questions

Explore conceptually related problems

Select the correct statements from the following

Select the correct statements from the following

Knowledge Check

  • Select the correct statement from th following.

    A
    Activated sludge in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria
    B
    Biogas is produced by the activity of aerobic bacteria on naimal waste (dung)
    C
    Methanobacterium is an aerobic bacterium found in rumen of cattle
    D
    Biogas, commonly called gobar gas, is pure methane.

  • An inorganic iodide (A) on heating with a solution of KOH gives a gas (B) and a solution of a compound. The gas (B) on ignition in air gives a compound (C ) and water. Copper sulphate is finally reduced to the methal on passing (B) through its solution. Select the correct statement from the following for the gas (B).

    A
    Its solution in water does not decompose in pressure of light.
    B
    It can be prepared by the alkaline hydrolysis of white phosphorus.
    C
    It is non- inflammable owing to the presence of `P_(2)H_(4)`.
    D
    It can act as oxidising agent.

  • Two identical objects A and B are at temperatures T_A and T_B . Respectively. Both objects are placed in a room with perfectly absorbing walls maintained at a temperature T(T_AgtTgtT_B) . The objects A and B attain the temperature T eventually. Select the correct statements from the following:

    A
    A only emits radiation while B only obsorbs it until both attain the temperature T
    B
    A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature T
    C
    Both A and B only absorb radiation, but do not emit it, until they attain the temperature T
    D
    Each object continuous to emit and absorb radiation even after attaining the temperature T.

    • Similar Questions

    Explore conceptually related problems

    In the given circuit, R, 10Omega R_(2) = 6Omega and E = 10V . Select the correct statements from the following

    Select the correct statements from the following I. Endosperm is generally triploid in angiosperms, II. All angiosperms have monosporic and endosporic embryo sac, III. Angiosperms are characterised by double fertilization, IV. All angisoperms show indirect pollination and siphonogamy

    Select the correct statement from the fllowing

    Select the correct statement form the following

    Selected the correct statement from the following

    Home
    Profile