Given below are two statements: Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body. Statement II: Exarch condition is the most common feature of the root system. In the light of the above statements, choose the correct answer from the options given below:
Answer: (D) Statement I is incorrect but Statement II is true.. Answer: (d) Statement I is incorrect but Statement II is true.
- A.Both Statement I and Statement II are true.
- B.Both Statement I and Statement II are not false.
- C.Statement I is correct but Statement II is false.
- D.Statement I is incorrect but Statement II is true.✓
Correct Answer
(D) Statement I is incorrect but Statement II is true.
Solution & Explanation
Answer: (d) Statement I is incorrect but Statement II is true. Solution: Statement I is wrong because endarch and exarch describe the position of the PROTOXYLEM (the first-formed primary xylem), not the secondary xylem – endarch means protoxylem towards the centre (as in stems) and exarch means protoxylem towards the periphery. Statement II is correct: roots characteristically have an exarch arrangement of xylem. Therefore Statement I is incorrect but Statement II is true, giving option (d). NCERT Reference: NCERT Class XI, Ch 6 Anatomy of Flowering Plants, p.76, line ~9: "Each vascular bundle is conjoint, open, and with endarch protoxylem" (endarch/exarch refer to protoxylem position; roots are exarch).