Placentation Types in Flowering Plants — NEET Biology

Correct answer: A — S2 and S4 only

Let's evaluate each statement regarding the functions and types of roots: S1: The main functions of the root system are absorption of water and minerals from the soil, providing a proper anchorage to the plant parts. This statement is correct. S2: In some plants, like grass, Monstera and the banyan tree, roots arise from parts of the plant other than the radicle and are called adventitious roots. In dicotyledonous plants, the direct elongation of the radicle forms the primary root. Therefore, adventitious roots do not always grow from the radicle, and the claim that they are typically found in dicotyledonous plants like mustard is incorrect as mustard has a tap root system from the radicle. This statement is NOT correct. S3: The main functions of the root system are... storing reserve food material and synthesis of plant growth regulators. This statement is correct. S4: The root cap protects the tender apex of the root. Root hairs, which absorb water and minerals from the soil, are formed by the epidermal cells in the region of maturation, not the root cap. This statement is NOT correct. S5: In monocotyledonous plants, the primary root is short lived and is replaced by a large number of roots. These roots originate from the base of the stem and constitute the fibrous root system. This statement is correct. Therefore, statements S2 and S4 are NOT correct. The final answer is A, as S2 and S4 only are not correct. Tested concept: Functions of the root system and distinguishing characteristics of different root types and regions.