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Read the following statements and select...

Read the following statements and select the correct ones.
i) All vertebrates are capable of osmoregulation and thermoregulation.
ii) Some species have evolved the ability to regulate, but only over a limited range of environmental conditions, beyond which they simply conform.
iii)99 per cent of animals and nearly all plants can- not maintain a constant internal environment. -
iv)Animals arc either perfect regulators or perfect conformers.

A

(i) and (ii)

B

(i) and (iii)

C

(iii) and (iv)

D

(i) and (iv)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to evaluate each statement regarding organisms and their ability to regulate their internal environments. Let's analyze each statement step by step. ### Step-by-Step Solution: 1. **Statement i: "All vertebrates are capable of osmoregulation and thermoregulation."** - **Analysis:** This statement is true. All vertebrates have the physiological mechanisms to regulate their internal environment, including maintaining fluid balance (osmoregulation) and body temperature (thermoregulation). - **Conclusion:** This statement is **correct**. 2. **Statement ii: "Some species have evolved the ability to regulate, but only over a limited range of environmental conditions, beyond which they simply conform."** - **Analysis:** This statement is true. Many species can regulate their internal environment only within certain limits. Outside of these limits, they may conform to the external environment. - **Conclusion:** This statement is **correct**. 3. **Statement iii: "99 percent of animals and nearly all plants cannot maintain a constant internal environment."** - **Analysis:** This statement is misleading. While it is true that many organisms cannot maintain a constant internal environment, it is not accurate to say that 99% of animals cannot do so. Many animals are capable of some form of regulation, although plants generally cannot. - **Conclusion:** This statement is **incorrect**. 4. **Statement iv: "Animals are either perfect regulators or perfect conformers."** - **Analysis:** This statement is false. Most animals exhibit a range of regulatory abilities and are not strictly perfect regulators or conformers. They may regulate to some extent but can also conform to environmental changes. - **Conclusion:** This statement is **incorrect**. ### Final Evaluation: - **Correct Statements:** i and ii. - **Incorrect Statements:** iii and iv. ### Answer: The correct option is **B: Statements i and ii are correct**. ---
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