Question

During development of embryo in angiosperms, the apical cell of the two-celled proembryo divides longitudinally and both the apical cell and basal cell take part in further development of embryo. This type of embryo is called as _____ type.

• A. Solanad
• B. Caryophyllad
• C. Asterad
• D. Chenopodiad

Hint:

Named after the family Caryophyllaceae, where both apical and basal cell derivatives build the embryo.

Answer 1

The Correct Option is B

Step 1: Johansen classified angiosperm embryogeny into several types based on the plane of the first division of the zygote and whether the basal cell contributes to the embryo proper or only to the suspensor.

Step 2: In the Caryophyllad type, the apical cell (ca) divides by a longitudinal (vertical) wall, and unlike types such as Solanad where the basal cell forms only the suspensor, here derivatives of both the apical and basal cells contribute to building the embryo body.

Step 3: This dual contribution of apical and basal cell derivatives is the defining feature of the Caryophyllad pattern, seen in families like Caryophyllaceae.