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
• B. R could be papaya whereas T could be rose
• C. Q could be barley where as S could be date palm
• D. R could be orchid where as S could be zostera.

Answer 1

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.