Sapwood is involved in the conduction of water and minerals from root to leaf.
BIOXI06: ANATOMY OF FLOWERING PLANTS
333998
Heart wood differs from sap wood in
1 Presence of rays and fibres
2 Absence of vessels and parenchyma
3 Having dead and non conducting element
4 Being susceptible to pests and pathogens
Explanation:
As a result of continued secondary growth in subsequent years, the older part of secondary xylem or wood become non-functional. The cells of this wood are filled with resins or tannins produced by adjacent functional cells , the activity of vessels become blocked by tyloses due to these all activities the wood become dark in colour called heartwood. Now the function of xylem is performed by outer younger -rings of xylem which is called sapwood.
AIPMT - 2010
BIOXI06: ANATOMY OF FLOWERING PLANTS
333999
Outer lighter coloured region of wood is
1 Autumn wood
2 Spring wood
3 Heart wood
4 Sap wood
Explanation:
The peripheral region of the secondary xylem, is lighter in colour and is known as the sapwood.
BIOXI06: ANATOMY OF FLOWERING PLANTS
334000
Statement A : Annual rings seen in a cut stem give an estimate of the age of the tree. Statement B : In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the statements are correct. The spring wood is lighter in colour and has a lower density whereas the autumn wood is darker and has a higher density. The two kinds of woods that appear as alternate concentric rings, constitute an annual ring. Annual rings seen in a cut stem give an estimate of the age of the tree. In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils in the central or innermost layers of the stem.
Sapwood is involved in the conduction of water and minerals from root to leaf.
BIOXI06: ANATOMY OF FLOWERING PLANTS
333998
Heart wood differs from sap wood in
1 Presence of rays and fibres
2 Absence of vessels and parenchyma
3 Having dead and non conducting element
4 Being susceptible to pests and pathogens
Explanation:
As a result of continued secondary growth in subsequent years, the older part of secondary xylem or wood become non-functional. The cells of this wood are filled with resins or tannins produced by adjacent functional cells , the activity of vessels become blocked by tyloses due to these all activities the wood become dark in colour called heartwood. Now the function of xylem is performed by outer younger -rings of xylem which is called sapwood.
AIPMT - 2010
BIOXI06: ANATOMY OF FLOWERING PLANTS
333999
Outer lighter coloured region of wood is
1 Autumn wood
2 Spring wood
3 Heart wood
4 Sap wood
Explanation:
The peripheral region of the secondary xylem, is lighter in colour and is known as the sapwood.
BIOXI06: ANATOMY OF FLOWERING PLANTS
334000
Statement A : Annual rings seen in a cut stem give an estimate of the age of the tree. Statement B : In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the statements are correct. The spring wood is lighter in colour and has a lower density whereas the autumn wood is darker and has a higher density. The two kinds of woods that appear as alternate concentric rings, constitute an annual ring. Annual rings seen in a cut stem give an estimate of the age of the tree. In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils in the central or innermost layers of the stem.
Sapwood is involved in the conduction of water and minerals from root to leaf.
BIOXI06: ANATOMY OF FLOWERING PLANTS
333998
Heart wood differs from sap wood in
1 Presence of rays and fibres
2 Absence of vessels and parenchyma
3 Having dead and non conducting element
4 Being susceptible to pests and pathogens
Explanation:
As a result of continued secondary growth in subsequent years, the older part of secondary xylem or wood become non-functional. The cells of this wood are filled with resins or tannins produced by adjacent functional cells , the activity of vessels become blocked by tyloses due to these all activities the wood become dark in colour called heartwood. Now the function of xylem is performed by outer younger -rings of xylem which is called sapwood.
AIPMT - 2010
BIOXI06: ANATOMY OF FLOWERING PLANTS
333999
Outer lighter coloured region of wood is
1 Autumn wood
2 Spring wood
3 Heart wood
4 Sap wood
Explanation:
The peripheral region of the secondary xylem, is lighter in colour and is known as the sapwood.
BIOXI06: ANATOMY OF FLOWERING PLANTS
334000
Statement A : Annual rings seen in a cut stem give an estimate of the age of the tree. Statement B : In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the statements are correct. The spring wood is lighter in colour and has a lower density whereas the autumn wood is darker and has a higher density. The two kinds of woods that appear as alternate concentric rings, constitute an annual ring. Annual rings seen in a cut stem give an estimate of the age of the tree. In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils in the central or innermost layers of the stem.
Sapwood is involved in the conduction of water and minerals from root to leaf.
BIOXI06: ANATOMY OF FLOWERING PLANTS
333998
Heart wood differs from sap wood in
1 Presence of rays and fibres
2 Absence of vessels and parenchyma
3 Having dead and non conducting element
4 Being susceptible to pests and pathogens
Explanation:
As a result of continued secondary growth in subsequent years, the older part of secondary xylem or wood become non-functional. The cells of this wood are filled with resins or tannins produced by adjacent functional cells , the activity of vessels become blocked by tyloses due to these all activities the wood become dark in colour called heartwood. Now the function of xylem is performed by outer younger -rings of xylem which is called sapwood.
AIPMT - 2010
BIOXI06: ANATOMY OF FLOWERING PLANTS
333999
Outer lighter coloured region of wood is
1 Autumn wood
2 Spring wood
3 Heart wood
4 Sap wood
Explanation:
The peripheral region of the secondary xylem, is lighter in colour and is known as the sapwood.
BIOXI06: ANATOMY OF FLOWERING PLANTS
334000
Statement A : Annual rings seen in a cut stem give an estimate of the age of the tree. Statement B : In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the statements are correct. The spring wood is lighter in colour and has a lower density whereas the autumn wood is darker and has a higher density. The two kinds of woods that appear as alternate concentric rings, constitute an annual ring. Annual rings seen in a cut stem give an estimate of the age of the tree. In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils in the central or innermost layers of the stem.
