Arrange the following stages of development of a dicot embryo in the order of their occurrence:
(A) Formation of heart-shaped embryo
(B) Formation of typical dicot embryo
(C) Formation of zygote
(D) Formation of globular embryo
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (C), (D), (A), (B)
(C) Formation of zygote — first. Fertilisation gives the zygote at the micropylar end of the embryo sac.
(D) Formation of globular embryo — second. The zygote divides into the proembryo and then a round (globular) embryo.
(A) Formation of heart-shaped embryo — third. The two cotyledons begin to grow, giving a heart shape.
(B) Formation of typical dicot embryo — last. The mature embryo has an embryonal axis and two cotyledons.
Note: A similar question was also asked in CUET (UG) 2025 on 14-05-2025 (Slot 2).
NCERT Extract:
Embryo – “Embryo develops at the micropylar end of the embryo sac where the zygote is situated. Most zygotes divide only after certain amount of endosperm is formed. This is an adaptation to provide assured nutrition to the developing embryo. Though the seeds differ greatly, the early stages of embryo development (embryogeny) are similar in both monocotyledons and dicotyledons. Figure 1.13 depicts the stages of embryogeny in a dicotyledonous embryo. The zygote gives rise to the proembryo and subsequently to the globular, heart-shaped and mature embryo.”