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6.Anatomy of Flowering Plants
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Contractile tissues have the following features
$(i)$ Mesodermal in origin
$(ii)$ They contain stretch receptors.
$(iii)$ Rhythmic contractions are seen in them
$(iv)$ They do not fatigue during the life of the animal
Which of the above are characteristics of sphincters?
A
All the four
B
Only $(i), (ii)$ and $(iii)$
C
Only $(i), (ii)$ and $(iv)$
D
Only $(i), (iii)$ and $(iv)$
(AIIMS-2015)
Solution
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Standard 11
Biology
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