285700
What is the fate of primary xylem in a dicot root showing extensive secondary growth?
1 It is retained in the centre of the axis.
2 It gets crushed.
3 May or may not get crushed.
4 It gets surrounded by primary phloem.
Explanation:
(a)The fate of primary xylem in a dicot root showing extensive growth because it is retained in the centre of the axis.
NCERT 87
Anatomy of Flowering Plants(NCERT)
285703
Casparian strips occur in
1 cortex
2 pericycle
3 epidermis
4 endodermis
Explanation:
(d)Casparian strips are found in endodermis of roots. It is a band of thickening which runs along the radial and tangential walls of endodermal cells. It is made up of suberin and lignin. Casparian strips prevent plasmolysis of endodermal cells. Cortex is found below epiblema. It is made up of thin-walled parenchymal cells. Epidermis is the outermost layer made up of thin-walled flattened and slightly elongated parenchymal cells. Pericycle is found below endodermis and it is made of parenchymatous cells.
NCERT 90
Anatomy of Flowering Plants(NCERT)
285704
Match the following and choose correct answer.
Column-I Column-II
(a) Radial vascular bundle (1) Root
(b) Polyarch xylem (2) Monocot root
(c) Well-developed pith (3) Dicot stem and monocot root
(a)Cortex tissue is found in between the epidermis and vascular bundles. It is multilayered, having 4–5 layers of cells. It is made up of parenchymatous cells with big intercellular spaces.
285700
What is the fate of primary xylem in a dicot root showing extensive secondary growth?
1 It is retained in the centre of the axis.
2 It gets crushed.
3 May or may not get crushed.
4 It gets surrounded by primary phloem.
Explanation:
(a)The fate of primary xylem in a dicot root showing extensive growth because it is retained in the centre of the axis.
NCERT 87
Anatomy of Flowering Plants(NCERT)
285703
Casparian strips occur in
1 cortex
2 pericycle
3 epidermis
4 endodermis
Explanation:
(d)Casparian strips are found in endodermis of roots. It is a band of thickening which runs along the radial and tangential walls of endodermal cells. It is made up of suberin and lignin. Casparian strips prevent plasmolysis of endodermal cells. Cortex is found below epiblema. It is made up of thin-walled parenchymal cells. Epidermis is the outermost layer made up of thin-walled flattened and slightly elongated parenchymal cells. Pericycle is found below endodermis and it is made of parenchymatous cells.
NCERT 90
Anatomy of Flowering Plants(NCERT)
285704
Match the following and choose correct answer.
Column-I Column-II
(a) Radial vascular bundle (1) Root
(b) Polyarch xylem (2) Monocot root
(c) Well-developed pith (3) Dicot stem and monocot root
(a)Cortex tissue is found in between the epidermis and vascular bundles. It is multilayered, having 4–5 layers of cells. It is made up of parenchymatous cells with big intercellular spaces.
285700
What is the fate of primary xylem in a dicot root showing extensive secondary growth?
1 It is retained in the centre of the axis.
2 It gets crushed.
3 May or may not get crushed.
4 It gets surrounded by primary phloem.
Explanation:
(a)The fate of primary xylem in a dicot root showing extensive growth because it is retained in the centre of the axis.
NCERT 87
Anatomy of Flowering Plants(NCERT)
285703
Casparian strips occur in
1 cortex
2 pericycle
3 epidermis
4 endodermis
Explanation:
(d)Casparian strips are found in endodermis of roots. It is a band of thickening which runs along the radial and tangential walls of endodermal cells. It is made up of suberin and lignin. Casparian strips prevent plasmolysis of endodermal cells. Cortex is found below epiblema. It is made up of thin-walled parenchymal cells. Epidermis is the outermost layer made up of thin-walled flattened and slightly elongated parenchymal cells. Pericycle is found below endodermis and it is made of parenchymatous cells.
NCERT 90
Anatomy of Flowering Plants(NCERT)
285704
Match the following and choose correct answer.
Column-I Column-II
(a) Radial vascular bundle (1) Root
(b) Polyarch xylem (2) Monocot root
(c) Well-developed pith (3) Dicot stem and monocot root
(a)Cortex tissue is found in between the epidermis and vascular bundles. It is multilayered, having 4–5 layers of cells. It is made up of parenchymatous cells with big intercellular spaces.
285700
What is the fate of primary xylem in a dicot root showing extensive secondary growth?
1 It is retained in the centre of the axis.
2 It gets crushed.
3 May or may not get crushed.
4 It gets surrounded by primary phloem.
Explanation:
(a)The fate of primary xylem in a dicot root showing extensive growth because it is retained in the centre of the axis.
NCERT 87
Anatomy of Flowering Plants(NCERT)
285703
Casparian strips occur in
1 cortex
2 pericycle
3 epidermis
4 endodermis
Explanation:
(d)Casparian strips are found in endodermis of roots. It is a band of thickening which runs along the radial and tangential walls of endodermal cells. It is made up of suberin and lignin. Casparian strips prevent plasmolysis of endodermal cells. Cortex is found below epiblema. It is made up of thin-walled parenchymal cells. Epidermis is the outermost layer made up of thin-walled flattened and slightly elongated parenchymal cells. Pericycle is found below endodermis and it is made of parenchymatous cells.
NCERT 90
Anatomy of Flowering Plants(NCERT)
285704
Match the following and choose correct answer.
Column-I Column-II
(a) Radial vascular bundle (1) Root
(b) Polyarch xylem (2) Monocot root
(c) Well-developed pith (3) Dicot stem and monocot root
(a)Cortex tissue is found in between the epidermis and vascular bundles. It is multilayered, having 4–5 layers of cells. It is made up of parenchymatous cells with big intercellular spaces.
