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Question

Refer  to the given dichotomous key and select the correct option:
I.(a) The plant bears complete flowers -Go to II
(b) The plant bears incomplete flowers - Go to III
I.(a) Plant undergoes self pollination - $$P$$
(b) Plant undergoes cross-pollination - Go to IV
III.(a) Plant undergoes wind pollination -$$Q$$
(b) Plant undergoes insect pollinations $$R$$
IV. (a) Plant undergoes water pollination -S
(b) Plant undergoes bat pollination -$$T$$


A
P could be Commelina whereas S could be sunflower
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B
R could be papaya whereas T could be rose
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C
Q could be barley where as S could be date palm
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D
R could be orchid where as S could be zostera.
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Solution

The correct option is D R could be orchid where as S could be zostera.
By the description given in the question, it is clear that  S undergoes water pollination so it has to be an aquatic plant and Zostera is an aquatic plant.  Butterflies( insects ) are main pollinating agents in rose.  
So, the correct option is option D.

Biology

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