Discussion
In plants, when the apical cell of the 2-celled pro-embryo divides longitudinally and further the basal cell plays only a minor role or none in the development of the embryo proper then the embryo is ............ type.
Answer: B
The embryo is of the Onagrad type.
In Johansen's classification of angiosperm embryo development, the first point is how the apical (terminal) cell of the two-celled proembryo divides. A longitudinal division places the embryo in the Crucifer group, which is split by the role of the basal cell. In the Onagrad (Crucifer) type, the basal cell contributes little or nothing to the embryo proper; in the Asterad type, the basal cell also contributes to it.
In the Solanad and Chenopodiad types, the apical cell divides transversely, so they are excluded by the first condition.
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