NEET BIOLOGY

Detailed explanation-1: -The action of cambium in temperate perennial plants begins in the spring. During this period, the wood produced is the spring wood or early wood. The cells of wood which are produced at later parts of the growth season are autumn wood or summer or late wood.

Detailed explanation-2: -Heartwood is the wood that has non-functional vessels due to deposition of lignin by tyloses. It appears dark and has more density. So, the correct answer is springwood is lighter in colour and has a lower density as compared to heartwood.

Detailed explanation-3: -Earlywood is formed in the spring season while the latewood is formed in the summer season. Earlywood is found in dicot plants whereas latewood is found in angiosperms. Latewood possesses dark colors, narrow vessels, and high density because they are formed in winter.

Detailed explanation-4: -The wood formed at the beginning of the growing season is the earlywood (in north temperate regions often referred to as springwood); the wood formed later in the season is the latewood (in north temperate regions often referred to as summerwood). The latewood generally is denser and darker than the earlywood.