Question

Both chasmogamous and cleistogamous flowers are present in

• A. Rosa
• B. Gossypium
• C. Commelina
• D. Helianthus

Answer 1

The correct option is C

Commelina

The correct option is C.

Explanation of the correct option:

1. Commelina produces two types of flowers: chasmogamous flowers, which open completely having exposed anthers and stigma, and cleistogamous flowers, which never open.
2. Chasmogamous flowers can undergo both self and cross-pollination.
3. However, cleistogamous flowers only have self-pollination.
4. The anthers and stigma are close together in such cleistogamous flowers.
5. Pollen grains come in contact with the stigma when anthers dehisce in flower buds, causing pollination.

Explanation of the incorrect options:

Option A:

1. A rose is a plant belonging to the Rosa genus, which includes over 100 varieties of perennial shrubs in the rose family.
2. Many roses are grown for their lovely blossoms, which range in colour from white to various shades of yellow and pink, as well as dark crimson and maroon.
3. Rose is a chasmogamous flower.

Option B:

1. Cotton is a plant belonging to the genus Gossypium which in turn falls under the Malvaceae family of flowering plants
2. It is native to the Old and New Worlds' tropical and subtropical climates.
3. Cotton is also a chasmogamous flower.

Option D:

1. The common Sunflower, Helianthus annuus, is a tall, fast-growing annual with broad, oval to heart-shaped, coarsely hairy leaves.
2. It produces big, beautiful chasmogamous flowers with yellow petals encircling a dark chocolate core disc in the summer.

Final answer: Both chasmogamous and cleistogamous flowers are present in Commelina.