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Standard X
Biology
Fertilisers and Pesticides
Which of the ...
Question

Which of the following can cause biomagnification

A
DDT
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B
Animal excreta
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C
Acids
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D
All of the above
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Solution

The correct option is A DDT
Some non-biodegradable insecticides like DDT enter the food chain from one tropic level to another and go on accumulating causing biomagnification.

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Q. Which of the following statements is not correct regarding biomagnification?

(i) Mercury accumulated by an organism cannot be metabolised.
(ii) In the process of biomagnification, concentration of DDT is increased at successive trophic levels.
(iii) Accumulation of cadmium can cause thinning of eggshells in birds.
(iv) DDT accumulation is a major cause of a reduced population of fish-eating birds.
(v) Biomagnification occurs only in the aquatic food chain

Q. Which one of the following is a heavy metal contaminant that can accumulate in biological organisms with biomagnification effects? What is the disease caused?
Q. Which of the following can undergo biomagnification?
Q. Q. With reference to biomagnification, consider the following statements:Which of the statements given above is/are correct?

Q. जैव आवर्धन (biomagnification) के संदर्भ में, निम्नलिखित कथनों पर विचार कीजिएः
  1. जैव आवर्धन से तात्पर्य प्रदूषकों के एक पोषी स्तर से दूसरे पोषी स्तर की ओर बढ़ने के क्रम में एकत्रित होने की प्रवृत्ति से है।
  2. जैव आवर्धन के लिए, प्रदूषकों को लंबे समय तक जीवित, गतिशील, जल में घुलनशील और जैविक रूप से सक्रिय होना चाहिए।
उपर्युक्त कथनों में से कौन सा/से सही है/हैं?

  1. 1 only
    केवल 1

  2. 2 only
    केवल 2

  3. Both 1 and 2
    1 और 2 दोनों

  4. Neither 1 nor 2
    न तो 1 और न ही 2
Q. Biomagnification of DDT causes decline in bird population by
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