: Sieve elements are "semi - alive" at maturity. They lose their nucleus and other organelles but other organelles but retain the endoplasmic reticulum, mitochondria and plastids.
BCECE-2012
Anatomy of Flowering Plants
271671
A common structural feature of vessel elements and sieve tube elements is-
1 Thick secondary walls
2 Pores on lateral wall
3 Presence of P-protein
4 Enucleate condition
Explanation:
Exp:D Vessels are a part of xylem whereas sieve tube is an element of phloem. The water- conducting xylem vessel elements are dead but sieve tube elements are living cells. They lose their nucleus on maturity and attain the enucleate condition. So, the common structural feature of vessel elements and sieve tube elements is enucleate condition.
JCECE-2013 AIPMT-2006
Anatomy of Flowering Plants
271690
In the following pairs, where do you get lignin in both the element?
1 Tracheid and collenchyma
2 Sclerenchyma and sieve tube
3 Sclerenchyma and trachea
4 Parenchyma and endodermis
Explanation:
Exp:C The walls of sclerenchyma and the walls of xylem cells are lignified. This allows the xylem to withstand pressure changes as water moves through the plant. Sclerenchyma provides mechanical strength to plants. On maturation the cell walls become strong, rigid and impermeable to water due to the thick deposition of lignin.
WB JEE-2008
Anatomy of Flowering Plants
271675
A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is
1 cork cambium
2 vascular cambium
3 endodermis
4 pericycle.
Explanation:
Exp:B A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is vascular cambium. Vascular cambium helps in secondary growth in dicot root and stem.
: Sieve elements are "semi - alive" at maturity. They lose their nucleus and other organelles but other organelles but retain the endoplasmic reticulum, mitochondria and plastids.
BCECE-2012
Anatomy of Flowering Plants
271671
A common structural feature of vessel elements and sieve tube elements is-
1 Thick secondary walls
2 Pores on lateral wall
3 Presence of P-protein
4 Enucleate condition
Explanation:
Exp:D Vessels are a part of xylem whereas sieve tube is an element of phloem. The water- conducting xylem vessel elements are dead but sieve tube elements are living cells. They lose their nucleus on maturity and attain the enucleate condition. So, the common structural feature of vessel elements and sieve tube elements is enucleate condition.
JCECE-2013 AIPMT-2006
Anatomy of Flowering Plants
271690
In the following pairs, where do you get lignin in both the element?
1 Tracheid and collenchyma
2 Sclerenchyma and sieve tube
3 Sclerenchyma and trachea
4 Parenchyma and endodermis
Explanation:
Exp:C The walls of sclerenchyma and the walls of xylem cells are lignified. This allows the xylem to withstand pressure changes as water moves through the plant. Sclerenchyma provides mechanical strength to plants. On maturation the cell walls become strong, rigid and impermeable to water due to the thick deposition of lignin.
WB JEE-2008
Anatomy of Flowering Plants
271675
A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is
1 cork cambium
2 vascular cambium
3 endodermis
4 pericycle.
Explanation:
Exp:B A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is vascular cambium. Vascular cambium helps in secondary growth in dicot root and stem.
: Sieve elements are "semi - alive" at maturity. They lose their nucleus and other organelles but other organelles but retain the endoplasmic reticulum, mitochondria and plastids.
BCECE-2012
Anatomy of Flowering Plants
271671
A common structural feature of vessel elements and sieve tube elements is-
1 Thick secondary walls
2 Pores on lateral wall
3 Presence of P-protein
4 Enucleate condition
Explanation:
Exp:D Vessels are a part of xylem whereas sieve tube is an element of phloem. The water- conducting xylem vessel elements are dead but sieve tube elements are living cells. They lose their nucleus on maturity and attain the enucleate condition. So, the common structural feature of vessel elements and sieve tube elements is enucleate condition.
JCECE-2013 AIPMT-2006
Anatomy of Flowering Plants
271690
In the following pairs, where do you get lignin in both the element?
1 Tracheid and collenchyma
2 Sclerenchyma and sieve tube
3 Sclerenchyma and trachea
4 Parenchyma and endodermis
Explanation:
Exp:C The walls of sclerenchyma and the walls of xylem cells are lignified. This allows the xylem to withstand pressure changes as water moves through the plant. Sclerenchyma provides mechanical strength to plants. On maturation the cell walls become strong, rigid and impermeable to water due to the thick deposition of lignin.
WB JEE-2008
Anatomy of Flowering Plants
271675
A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is
1 cork cambium
2 vascular cambium
3 endodermis
4 pericycle.
Explanation:
Exp:B A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is vascular cambium. Vascular cambium helps in secondary growth in dicot root and stem.
: Sieve elements are "semi - alive" at maturity. They lose their nucleus and other organelles but other organelles but retain the endoplasmic reticulum, mitochondria and plastids.
BCECE-2012
Anatomy of Flowering Plants
271671
A common structural feature of vessel elements and sieve tube elements is-
1 Thick secondary walls
2 Pores on lateral wall
3 Presence of P-protein
4 Enucleate condition
Explanation:
Exp:D Vessels are a part of xylem whereas sieve tube is an element of phloem. The water- conducting xylem vessel elements are dead but sieve tube elements are living cells. They lose their nucleus on maturity and attain the enucleate condition. So, the common structural feature of vessel elements and sieve tube elements is enucleate condition.
JCECE-2013 AIPMT-2006
Anatomy of Flowering Plants
271690
In the following pairs, where do you get lignin in both the element?
1 Tracheid and collenchyma
2 Sclerenchyma and sieve tube
3 Sclerenchyma and trachea
4 Parenchyma and endodermis
Explanation:
Exp:C The walls of sclerenchyma and the walls of xylem cells are lignified. This allows the xylem to withstand pressure changes as water moves through the plant. Sclerenchyma provides mechanical strength to plants. On maturation the cell walls become strong, rigid and impermeable to water due to the thick deposition of lignin.
WB JEE-2008
Anatomy of Flowering Plants
271675
A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is
1 cork cambium
2 vascular cambium
3 endodermis
4 pericycle.
Explanation:
Exp:B A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is vascular cambium. Vascular cambium helps in secondary growth in dicot root and stem.
