Question

Drosera tentacles shows

• A. Chemonasty
• B. Thigmonasty
• C. Hydrotropism
• D. Both (A) and (B)

Answer 1

The correct option is B Thigmonasty

Drosera is a small plant growing in marshy places. This plant is also known as sundew plant. The leaves of this plant have numerous hair-like structures called as tentacles. Each tentacle has got a gland at the tip. The gland secretes a sticky fluid. This fluid shines in sunlight and appears as dew; hence the plant is called as sundew plant. When an insect is attracted by the shining sticky fluid and tries to sit on the leaf, it is entangled in the sticky fluid. At once, the sensitive tentacles surround the insect and curve inward on it due to the pressure exerted or the touch of the insect. Then the glands secrete digestive juices which contain proteolytic enzymes. The enzymes digest the proteins of the insect body. The digested food is finally absorbed by the leaves and the tentacles again come in their original straight position.

Thus, the correct answer is option B.