Question

Which of the following two parts observed in the embryo of grass plant are not observed in the embryo of pea plant?

• A. Shoot apex and Coleoptile
• B. Radicle and Coleorrhiza
• C. Coleoptile and Coleorrhiza
• D. Scutellum and Coleoptile

Hint:

Coleoptile protects the plumule and coleorrhiza protects the radicle. Both are characteristic structures of monocot embryos.

Answer 1

The Correct Option is C

Concept: Grass plants are monocots, whereas pea is a dicot. The embryos of monocots possess certain specialized protective structures that are absent in dicot embryos.

Step 1: Recall the monocot embryo. The monocot embryo contains:
• Scutellum
• Plumule
• Radicle
• Coleoptile
• Coleorrhiza

Step 2: Understand the functions. Coleoptile:
• Protects the plumule. Coleorrhiza:
• Protects the radicle.

Step 3: Recall the dicot embryo. The embryo of pea contains:
• Two cotyledons
• Plumule
• Radicle However, it lacks both coleoptile and coleorrhiza.

Step 4: Final conclusion. Structures present in grass embryo but absent in pea embryo are: \[ \text{Coleoptile and Coleorrhiza} \] Hence option (C) is correct.