271892
What is/are true about heart wood? A. It does not help in water conduction B. It is also called alburnum. C. It is dark in color but very soft. D. It has tracheary elements which are filled with tannin, resin etc.
1 A and D
2 B and D
3 A, B and C
4 B, C and D
Explanation:
Exp:A Heart wood does not help in water conduction. - Heart wood has tracheary elements which are filled with tannin, resin, etc.
Karnataka CET-2009
Anatomy of Flowering Plants
271896
Heartwood differs from sapwood in -
1 Presence of rays and fibres
2 Abscence of vessels and parenchyma
3 Having dead and non-conducting elements
4 Being susceptible to pests and pathogens
Explanation:
Exp:C Heartwood (Duramen) and sapwood (Alburnum) are two distinct forms of wood found in older woody trees. The heartwood is composed of dead xylem vessels that have been filled with Tyloses and are rich in deposits of resins and tannins. These are unusable and are darker. The sapwood contains nearly created functioning vessels that seem lighter. The heartwood protects wood against pest attack while also increasing its durability.
AIPMT (Screening)-2010
Anatomy of Flowering Plants
271897
Half life period of \(\mathrm{C}^{14}\) is : -
1 500 years
2 5000 years
3 50 years
4 \(5 \times 10^{4}\) year
Explanation:
Exp:B The half-period of \(\mathrm{C}^{14}\) is 5000 years. It is used in the determination of age of fossils by using technique called carbon dating. - \(\mathrm{C}^{14}\) has a half-life of 5,730 \(\pm 40\) years- i.e. half the amount of the radio isotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years.
AIPMT-2001
Anatomy of Flowering Plants
271887
Age of a tree can be estimated by:
1 diameter of its heartwood
2 its height and girth
3 biomass
4 number of annual rings
Explanation:
Exp:D Age of tree can be estimated by number of annual rings. The two kinds of woods that appear as alternate concentric ring. Constitute an annual ring heartwood comprises dead element with highly lignified wall that give mechanical support to the stem.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Anatomy of Flowering Plants
271892
What is/are true about heart wood? A. It does not help in water conduction B. It is also called alburnum. C. It is dark in color but very soft. D. It has tracheary elements which are filled with tannin, resin etc.
1 A and D
2 B and D
3 A, B and C
4 B, C and D
Explanation:
Exp:A Heart wood does not help in water conduction. - Heart wood has tracheary elements which are filled with tannin, resin, etc.
Karnataka CET-2009
Anatomy of Flowering Plants
271896
Heartwood differs from sapwood in -
1 Presence of rays and fibres
2 Abscence of vessels and parenchyma
3 Having dead and non-conducting elements
4 Being susceptible to pests and pathogens
Explanation:
Exp:C Heartwood (Duramen) and sapwood (Alburnum) are two distinct forms of wood found in older woody trees. The heartwood is composed of dead xylem vessels that have been filled with Tyloses and are rich in deposits of resins and tannins. These are unusable and are darker. The sapwood contains nearly created functioning vessels that seem lighter. The heartwood protects wood against pest attack while also increasing its durability.
AIPMT (Screening)-2010
Anatomy of Flowering Plants
271897
Half life period of \(\mathrm{C}^{14}\) is : -
1 500 years
2 5000 years
3 50 years
4 \(5 \times 10^{4}\) year
Explanation:
Exp:B The half-period of \(\mathrm{C}^{14}\) is 5000 years. It is used in the determination of age of fossils by using technique called carbon dating. - \(\mathrm{C}^{14}\) has a half-life of 5,730 \(\pm 40\) years- i.e. half the amount of the radio isotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years.
AIPMT-2001
Anatomy of Flowering Plants
271887
Age of a tree can be estimated by:
1 diameter of its heartwood
2 its height and girth
3 biomass
4 number of annual rings
Explanation:
Exp:D Age of tree can be estimated by number of annual rings. The two kinds of woods that appear as alternate concentric ring. Constitute an annual ring heartwood comprises dead element with highly lignified wall that give mechanical support to the stem.
271892
What is/are true about heart wood? A. It does not help in water conduction B. It is also called alburnum. C. It is dark in color but very soft. D. It has tracheary elements which are filled with tannin, resin etc.
1 A and D
2 B and D
3 A, B and C
4 B, C and D
Explanation:
Exp:A Heart wood does not help in water conduction. - Heart wood has tracheary elements which are filled with tannin, resin, etc.
Karnataka CET-2009
Anatomy of Flowering Plants
271896
Heartwood differs from sapwood in -
1 Presence of rays and fibres
2 Abscence of vessels and parenchyma
3 Having dead and non-conducting elements
4 Being susceptible to pests and pathogens
Explanation:
Exp:C Heartwood (Duramen) and sapwood (Alburnum) are two distinct forms of wood found in older woody trees. The heartwood is composed of dead xylem vessels that have been filled with Tyloses and are rich in deposits of resins and tannins. These are unusable and are darker. The sapwood contains nearly created functioning vessels that seem lighter. The heartwood protects wood against pest attack while also increasing its durability.
AIPMT (Screening)-2010
Anatomy of Flowering Plants
271897
Half life period of \(\mathrm{C}^{14}\) is : -
1 500 years
2 5000 years
3 50 years
4 \(5 \times 10^{4}\) year
Explanation:
Exp:B The half-period of \(\mathrm{C}^{14}\) is 5000 years. It is used in the determination of age of fossils by using technique called carbon dating. - \(\mathrm{C}^{14}\) has a half-life of 5,730 \(\pm 40\) years- i.e. half the amount of the radio isotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years.
AIPMT-2001
Anatomy of Flowering Plants
271887
Age of a tree can be estimated by:
1 diameter of its heartwood
2 its height and girth
3 biomass
4 number of annual rings
Explanation:
Exp:D Age of tree can be estimated by number of annual rings. The two kinds of woods that appear as alternate concentric ring. Constitute an annual ring heartwood comprises dead element with highly lignified wall that give mechanical support to the stem.
271892
What is/are true about heart wood? A. It does not help in water conduction B. It is also called alburnum. C. It is dark in color but very soft. D. It has tracheary elements which are filled with tannin, resin etc.
1 A and D
2 B and D
3 A, B and C
4 B, C and D
Explanation:
Exp:A Heart wood does not help in water conduction. - Heart wood has tracheary elements which are filled with tannin, resin, etc.
Karnataka CET-2009
Anatomy of Flowering Plants
271896
Heartwood differs from sapwood in -
1 Presence of rays and fibres
2 Abscence of vessels and parenchyma
3 Having dead and non-conducting elements
4 Being susceptible to pests and pathogens
Explanation:
Exp:C Heartwood (Duramen) and sapwood (Alburnum) are two distinct forms of wood found in older woody trees. The heartwood is composed of dead xylem vessels that have been filled with Tyloses and are rich in deposits of resins and tannins. These are unusable and are darker. The sapwood contains nearly created functioning vessels that seem lighter. The heartwood protects wood against pest attack while also increasing its durability.
AIPMT (Screening)-2010
Anatomy of Flowering Plants
271897
Half life period of \(\mathrm{C}^{14}\) is : -
1 500 years
2 5000 years
3 50 years
4 \(5 \times 10^{4}\) year
Explanation:
Exp:B The half-period of \(\mathrm{C}^{14}\) is 5000 years. It is used in the determination of age of fossils by using technique called carbon dating. - \(\mathrm{C}^{14}\) has a half-life of 5,730 \(\pm 40\) years- i.e. half the amount of the radio isotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years.
AIPMT-2001
Anatomy of Flowering Plants
271887
Age of a tree can be estimated by:
1 diameter of its heartwood
2 its height and girth
3 biomass
4 number of annual rings
Explanation:
Exp:D Age of tree can be estimated by number of annual rings. The two kinds of woods that appear as alternate concentric ring. Constitute an annual ring heartwood comprises dead element with highly lignified wall that give mechanical support to the stem.
