Identify the plant which does not produce chasmogamous and cleistogamous flowers.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Zostera
Some plants produce two kinds of flowers. Cleistogamous flowers never open. Their anthers and stigma lie close together, so the pollen falls on the stigma inside the closed bud. Such flowers are always self-pollinated, and they set seed even when no pollinator is present.
(1) Viola — Produces both kinds of flowers. It is the common pansy.
(2) Commelina — Produces both kinds of flowers.
(3) Zostera — Does not produce these two kinds of flowers. It is a marine sea-grass whose pollen is carried by water. It is not one of the plants known for this pair of flowers.
(4) Oxalis — Produces both kinds of flowers.
NCERT Extract:
Pollination – “… Some plants such as Viola (common pansy), Oxalis, and Commelina produce two types of flowers – chasmogamous flowers which are similar to flowers of other species with exposed anthers and stigma, and cleistogamous flowers which do not open at all (Figure 1.9c). In such flowers, the anthers and stigma lie close to each other.”
Pollination – “… Some examples of water pollinated plants are Vallisneria and Hydrilla which grow in fresh water and several marine sea-grasses such as Zostera.”
