Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Mendel’s law of Independent assortment does not hold good for the genes that are located closely on the same chromosome. Reason (R): Closely located genes assort independently.
In the light of the above statements, choose the correct answer from the options given below:
If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted by him is called as:
The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood.
A. It is also called as the earlywood
B. In spring season cambium produces xylem elements with narrow vessels
C. It is lighter in colour
D. The springwood along with autumnwood shows alternate concentric rings forming annual rings
E. It has lower density
Choose the correct answer from the options given below :
Explanation:
Springwood (earlywood) is formed in the spring and consists of wider xylem vessels and thinner walls, making it lighter in color and with lower density. It forms part of the annual ring with Autumnwood (latewood). Thus A is true, C true, D true, and E true. Statement B is false because springwood has wide, not narrow, vessels. The correct set is A, C, D and E.
🧠 Did You Know?
Annual rings are formed by the alternating growth in spring (earlywood) and late summer/fall (latewood), creating distinct light and dark zones in the stem.
💡 NCERT Memory Line:
Earlywood is lighter, has wide vessels and lower density; latewood is darker and denser, forming the characteristic yearly rings.
