Question

Which of the given statements are true?
(i) During the development of a dicot embryo, heart-shaped embryo is followed by globular embryo.
(ii) The part of embryonal axis above the level of cotyledons is epicotyl, while the part below the level of cotyledons is hypocotyl.
(iii) Monocot seeds possess a single cotyledon represented by scutellum.

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (i) and (iii)
• D. (i), (ii) and (iii)

Answer 1

The correct option is B (ii) and (iii)

During the development of dicot embryo, initially the dicot embryo is globular and undifferentiated. Early embryo with radial symmetry is called pro-embryo. It is transformed into embryo with the development of radicle, plumple and cotyledons. Two cotyledons differentiate from the sides with a faint plumle in the centre. At this time the embryo becomes heart-shaped.

Part of embryo axis between the plumple and cotyledonary node is epicotyle (the level of cotyledons) while the part between radicle and cotyledonary node is called hypocotyl (the level of cotyledons).

The single cotyledon of monocotyledonous seed(e.g., maize grain) is called scutellum. It occupies the major portion of the embryo regions of grain.

So, the correct answer is '(ii) and (iii)'.