Question

Identify the correct sequence of mature embryo formation from zygote. Stages given:
• [(A)] Heart-shaped embryo
• [(B)] Globular embryo
• [(C)] Proembryo
• [(D)] Mature embryo Choose the correct answer from the options given below:

• A. \((A),\ (B),\ (C),\ (D)\)
• B. \((B),\ (A),\ (D),\ (C)\)
• C. \((A),\ (D),\ (B),\ (C)\)
• D. \((C),\ (B),\ (A),\ (D)\)

Hint:

Sequence of embryo development: \[ \text{Proembryo} \rightarrow \text{Globular embryo} \rightarrow \text{Heart-shaped embryo} \rightarrow \text{Mature embryo} \]

Answer 1

The Correct Option is D

Embryo development in angiosperms occurs in a definite sequence starting from the zygote.
Step 1: Formation of proembryo
• The zygote first undergoes mitotic divisions.
• This early developmental stage is called proembryo.
Step 2: Formation of globular embryo
• Further divisions produce a spherical structure.
• This stage is called globular embryo.
Step 3: Formation of heart-shaped embryo
• In dicot embryos, cotyledons begin to develop.
• The embryo acquires a heart-like shape.
Step 4: Formation of mature embryo
• The embryo fully differentiates into mature embryo.
• It contains plumule, radicle and cotyledons. Thus, the correct sequence is: \[ (C)\rightarrow(B)\rightarrow(A)\rightarrow(D) \] Option analysis:
• Option (A): Incorrect order
• Option (B): Incorrect order
• Option (C): Incorrect order
• Option (D): Correct Therefore: \[ \boxed{\text{(D)}} \]