Please answer this with appropriate explanation of the answer question number 17 and 18 in the same window please
Q.17) What is the concentration of DDT in fish eating birds?
(A) 25 ppm
(B) 0.5 ppm
(C) 2 ppm
(D) 0.003 ppm
Q.18) Name the animal where sex ratio is effected by temperature.
(A) Earthworm
(B) Rotifers
(C) Ascaris
(D) Frog
Dear student
Please refer the solution below for the said query
The correct option is A.
Biological magnification, also known as bio-magnification refers to the increase in the concentration of toxic substances like DDT, chemicals, heavy substances etc. with each successive trophic level of the food chain. The concentration of these toxic substances is highest at the highest trophic level here fish eating birds. If it is 0.003ppm in water, it can finally reach 25 ppm in fish eating birds.
Q18.
The correct option is B.
In rotifers, the sex ratio is determined by temperature. At low temperature, the eggs develop into females while at high temperature the eggs develop either into male or female.
Hope this information clears your doubt about the topic.
Regards
Please refer the solution below for the said query
The correct option is A.
Biological magnification, also known as bio-magnification refers to the increase in the concentration of toxic substances like DDT, chemicals, heavy substances etc. with each successive trophic level of the food chain. The concentration of these toxic substances is highest at the highest trophic level here fish eating birds. If it is 0.003ppm in water, it can finally reach 25 ppm in fish eating birds.
Q18.
The correct option is B.
In rotifers, the sex ratio is determined by temperature. At low temperature, the eggs develop into females while at high temperature the eggs develop either into male or female.
Hope this information clears your doubt about the topic.
Regards