Question

Circinate ptyxis present in fern leaves is due to

• A. Epinasty
• B. Hyponasty
• C. Nutation
• D. Movement of variation

Answer 1

The correct option is B Hyponasty

Nastic movements are responses of plant parts to stimuli. Epinasty is the downward bending of a leaf resulting from greater growth of the upper side than of the lower side. Due to more growth on the upper side, the flower will open as a result of epinasty. The hyponasty is an upward bending or uncoiling of leaves resulting from greater growth of the lower side. Circinate ptyxis is found only in fern leaves due to hypoasty. Nutation is the bending movements shown by some plant parts due to the unequal rate of growth of different parts of plants.

Thus, the correct answer is option B.