Q. With reference to the ‘zones’ of a freshwater pond ecosystem, consider the following statements:

Which of the statements given above is/are correct?

Q. मीठे पानी के तालाब के पारिस्थितिकी तंत्र के 'क्षेत्रों' के संदर्भ में, निम्नलिखित कथनों पर विचार कीजिए:

उपर्युक्त कथनों में से कौन-सा/से सही है/हैं?

1 and 4 only
केवल 1 और 4

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3 only
केवल 3

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2 and 4 only
केवल 2 और 4

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1, 2 and 3 only
केवल 1, 2 और 3

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Solution

The correct option is A
1 and 4 only
केवल 1 और 4
1 and 4 only
केवल 1 और 4

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Similar questions

The correct statement with regard to $H_{2}^{+}$ & $H_{2}^{-}$ is

Assertion : For drying $H_{2} S$ , Conc. $H_{2} S O_{4}$ cannot be used.

Reason: Moist $H_{2} S$ is oxidized by Conc. $H_{2} S O_{4}$

a_{0}

N O

H_{2}

P_{H_{2}}

(mm of Hg)	359	300	152
$- \frac{P_{H_{2}}}{d t}$	1.50	1.03	0.25

P_{N O}

$P_{H_{2}}$ (mm of Hg)	289	205	147
$- \frac{P_{H_{2}}}{d t}$	1.60	1.10	0.79

H_{2}

N O

H_{2}^{+}

H_{2}^{-}

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