Root System Types in Dicots — NEET Biology
📚 Practice ConceptIn majority of the dicotyledonous plants, the direct elongation of the radicle leads to the formation of primary root which grows inside the soil. It bears lateral roots of several orders that are referred to as secondary, tertiary, etc. roots. The primary roots and its branches constitute the
Which of the above statements are correct? S1: Roots generally exhibit negative phototropism, guiding their growth away from light sources. S2: The region of meristematic activity in the root is primarily characterised by cells undergoing rapid elongation and enlargement. S3: The main function of the root cap is the efficient absorption of water and minerals from the soil. S4: Lateral roots within a taproot system are commonly referred to as secondary and tertiary roots, branching from the primary root. S5: In monocotyledonous plants, the entire fibrous root system originates directly from the plumule of the embryo.
View solution & NCERT explanation
Correct answer: A — S1 and S4 are correct
Let's evaluate each statement based on NCERT Chapter 5: S1: Roots generally exhibit negative phototropism, guiding their growth away from light sources. (Correct) The summary states that stems have a 'positively phototropic nature' (Page 69), implying that roots, which grow underground, are negatively phototropic. S2: The region of meristematic activity in the root is primarily characterised by cells undergoing rapid elongation and enlargement. (Incorrect) This describes the region of elongation. The meristematic cells are 'very small, thin-walled and with dense protoplasm. They divide repeatedly.' (Page 59). S3: The main function of the root cap is the efficient absorption of water and minerals from the soil. (Incorrect) The root cap's function is to 'protect the tender apex of the root as it makes its way through the soil' (Page 59). Root hairs in the region of maturation are responsible for absorption. S4: Lateral roots within a taproot system are commonly referred to as secondary and tertiary roots, branching from the primary root. (Correct) 'It [primary root] bears lateral roots of several orders that are referred to as secondary, tertiary, etc. roots. The primary roots and its branches constitute the tap root system...' (Page 58). S5: In monocotyledonous plants, the entire fibrous root system originates directly from the plumule of the embryo. (Incorrect) In monocotyledonous plants, the fibrous roots originate from the base of the stem (Page 58). The plumule develops into the stem. Therefore, S1 and S4 are the correct statements. Option A correctly identifies S1 and S4 as correct. Options B, C, and D include incorrect statements.
What does NCERT say about majority dicotyledonous plants direct?
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.