Monocot vs Dicot Vascular Structure — NEET Biology
📚 Practice ConceptMonocotyledonous and dicotyledonous plants show marked variation in their internal structures. They differ in type, number and location of vascular bundles. The secondary growth occurs in most of the dicotyledonous roots and stems.
Which of the following statements are correct regarding cambium and secondary growth in flowering plants? S1. Cambium is typically present in the vascular bundles of dicot stems, making them open. S2. Secondary growth is a characteristic feature observed only in dicotyledonous roots and stems. S3. In monocotyledonous stems, the absence of cambium prevents the formation of secondary xylem and phloem. S4. The initiation of lateral roots and vascular cambium during secondary growth in dicot roots occurs in the pericycle. S5. Monocot roots commonly show a cambium ring developing between xylem and phloem, similar to dicot roots.
View solution & NCERT explanation
Correct answer: B — S1, S3 and S4 only
The question pertains to the presence and function of cambium in dicot and monocot plants, specifically concerning secondary growth. S1. Correct. Dicotyledonous stems have cambium present between phloem and xylem, making their vascular bundles 'open' and capable of secondary growth. (NCERT Page 73, Para 6.1.3) S2. Incorrect. Secondary growth occurs in most dicotyledonous roots and stems, but the statement 'only' is too restrictive, as some gymnosperms also show it, but within the context of flowering plants (angiosperms) it is characteristic of dicots. More precisely, 'most' dicots undergo secondary growth. However, NCERT summary states: 'The secondary growth occurs in most of the dicotyledonous roots and stems.' The term 'only' makes it incorrect for a general plant context if considering gymnosperms, but within the chapter's focus on flowering plants, it's generally true that it's a dicot feature. Let's re-evaluate after other statements. S3. Correct. Monocotyledonous stems lack cambium in their vascular bundles, rendering them 'closed' and incapable of forming secondary tissues. (NCERT Page 73, Para 6.1.3) S4. Correct. In dicot roots, the pericycle is the site for the initiation of lateral roots and the vascular cambium during secondary growth. (NCERT Page 74, Para 6.2.1) S5. Incorrect. Monocot roots do not undergo secondary growth, and thus a cambium ring does not develop between xylem and phloem. This is a characteristic of dicot roots. (NCERT Page 74, Para 6.2.2 and Page 74, Para 6.2.1 for dicot root cambium development). Therefore, statements S1, S3, and S4 are correct. The final answer is B because S1, S3, and S4 accurately describe the features related to cambium and secondary growth in flowering plants, while S2 is incorrect due to the absolute 'only' and S5 incorrectly attributes cambium ring formation to monocot roots. Tested concept: Comparison of cambium presence, vascular bundle types, and occurrence of secondary growth in dicot stems, monocot stems, and dicot roots.
What does NCERT say about Monocotyledonous and dicotyledonous plants?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.