NEET Biology question
Refer to the given dichotomous key for classifying population interactions: 1(a) Positive interaction → go to II; (b) Negative interaction → go to III. 2(a) Obligatory interaction where both partners cannot live separately → P; (b) Interaction where both are benefitted but can exist independently → Q. 3(a) One organism secretes chemicals that inhibit another's growth → R; (b) One organism lives inside another and derives nutrition from it → S. Select the incorrect option regarding P, Q, R and S.
Solution
The fungus and alga of a lichen are obligately interdependent and cannot survive separately in nature, correctly illustrating P-type (obligate mutualism); a bee and the flowers it visits both benefit (pollen/nectar transfer and pollination) but each could, in principle, survive using other partners, correctly
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