Description : Which exposed wood will decay faster? (a) Sapwood (b) Softwood (c) Wood with lot of fibres (d) Heartwood
Last Answer : a) Sapwood
Description : Heartwood differs from sapwood in (a) presence of rays and fibres (b) absence of vessels and parenchyma (c) having dead and non-conducting elements (d) being susceptible to pests and pathogens.
Last Answer : (c) having dead and non-conducting elements
Description : Identify the incorrect statement. (a) Heartwood does not conduct water but gives mechanical support. (b) Sapwood is involved in conduction of water and minerals from root to leaf. (c) Sapwood is the innermost ... . (d) Due to deposition of tannins, resins, oils, etc., heartwood is dark in colour.
Last Answer : (c) Sapwood is the innermost secondary xylem and is lighter in colour
Description : Sapwood consists of (A) Innermost annular rings around the pith (B) Portion of timber between heartwood and cambium layer (C) Thin layers below the bark (D) Thin fibre which extends from the pith outwards and holds the annular rings together
Last Answer : Answer: Option B
Description : What is heartwood? -Biology
Last Answer : answer:
Description : Why is heartwood darker? -Biology
Description : Why is heartwood rot resistant? -Biology
Description : As a tree grows older, which of the following increases more rapidly in thickness? (a) Heart wood (b) Sapwood (c) Phloem (d) Cortex
Last Answer : (a) Heart wood
Description : The balloon-shaped structures called tyloses (a) originate in the lumen of vessels (b) characterise the sapwood (c) are extensions of xylem parenchyma cells into vessels (d) are linked to the ascent of sap through xylem vessels.
Last Answer : (c) are extensions of xylem parenchyma cells into vessels
Description : Inner part of a timber log surrounding the pitch, is called (A) Sapwood (B) Cambium layer (C) Heart wood (D) None to these
Last Answer : Answer: Option C
Description : Age of a tree can be estimated by (a) number of annual rings (b) diameter of its heartwood (c) its height and girth (d) biomass.
Last Answer : (a) number of annual rings
Description : Identify the wrong statement in context of heartwood. (a) It is highly durable. (b) It conducts water and minerals efficiently. (c) It comprises dead elements with highly lignified walls. (d) Organic compounds are deposited in it.
Last Answer : (b) It conducts water and minerals efficiently
Description : Identify the wrong statement in context of heartwood: (1) It is highly durable (2) It conducts water and minerals efficiently (3) It comprises dead elements with highly lignified walls (4) Organic compounds are deposited in it
Last Answer : 2) It conducts water and minerals efficiently