271404
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
1 presence of cortex.
2 position of protoxylem.
3 absence of secondary xylem.
4 absence of secondary phloem.
Explanation:
(b) Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by position of cortex. Protoxylem is the first-formed xylem developing from procambium and consisting of narrow cells with annular, spiral, or scalariform wall thickenings.
Anatomy of Flowering Plants
271405
Which one of the following option is correct about bulliform/motor cell ?
1 It is seen in grasses.
2 It is large-sized, thin-walled colourless, vacuolate cells on the adaxial surface.
3 It helps in rolling of leaf to minimise water loss when it is flaccid.
4 All of the above
Explanation:
(d) All the statements are correct regarding Bulliform or motor cells. They are large, bubble-shaped, empty colourless epidermal cells that occur in groups on the upper surface of the leaves of many grasses. Loss of turgor pressure in these cells causes leaves to "roll up" during water stress.
Anatomy of Flowering Plants
271406
Which of the following are present in monocot root?
1 conjoint, collateral, open polyarch vascular bundle.
(d) The internal structure of a typical monocotyledon root is similar to dicotyledon root. Number of xylem bundles are more than six (polyarch) in monocotyledon root (exceptionally the number of xylem bundles are two to six in onion). Pith is well developed in monocotyledon root. Monocot roots do not undergo secondary growth.
Anatomy of Flowering Plants
271407
Where do the casparian bands occur?
1 Epidermis
2 Endodermis
3 Pericycle
4 Phloem
Explanation:
(b) Endodermis or innermost layer of cortex has casparian strips in roots. It is called starch sheath in dicot stems. It separates cortex from stele. The cell walls are thickened at the corners in angular collenchyma.
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Anatomy of Flowering Plants
271404
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
1 presence of cortex.
2 position of protoxylem.
3 absence of secondary xylem.
4 absence of secondary phloem.
Explanation:
(b) Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by position of cortex. Protoxylem is the first-formed xylem developing from procambium and consisting of narrow cells with annular, spiral, or scalariform wall thickenings.
Anatomy of Flowering Plants
271405
Which one of the following option is correct about bulliform/motor cell ?
1 It is seen in grasses.
2 It is large-sized, thin-walled colourless, vacuolate cells on the adaxial surface.
3 It helps in rolling of leaf to minimise water loss when it is flaccid.
4 All of the above
Explanation:
(d) All the statements are correct regarding Bulliform or motor cells. They are large, bubble-shaped, empty colourless epidermal cells that occur in groups on the upper surface of the leaves of many grasses. Loss of turgor pressure in these cells causes leaves to "roll up" during water stress.
Anatomy of Flowering Plants
271406
Which of the following are present in monocot root?
1 conjoint, collateral, open polyarch vascular bundle.
(d) The internal structure of a typical monocotyledon root is similar to dicotyledon root. Number of xylem bundles are more than six (polyarch) in monocotyledon root (exceptionally the number of xylem bundles are two to six in onion). Pith is well developed in monocotyledon root. Monocot roots do not undergo secondary growth.
Anatomy of Flowering Plants
271407
Where do the casparian bands occur?
1 Epidermis
2 Endodermis
3 Pericycle
4 Phloem
Explanation:
(b) Endodermis or innermost layer of cortex has casparian strips in roots. It is called starch sheath in dicot stems. It separates cortex from stele. The cell walls are thickened at the corners in angular collenchyma.
271404
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
1 presence of cortex.
2 position of protoxylem.
3 absence of secondary xylem.
4 absence of secondary phloem.
Explanation:
(b) Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by position of cortex. Protoxylem is the first-formed xylem developing from procambium and consisting of narrow cells with annular, spiral, or scalariform wall thickenings.
Anatomy of Flowering Plants
271405
Which one of the following option is correct about bulliform/motor cell ?
1 It is seen in grasses.
2 It is large-sized, thin-walled colourless, vacuolate cells on the adaxial surface.
3 It helps in rolling of leaf to minimise water loss when it is flaccid.
4 All of the above
Explanation:
(d) All the statements are correct regarding Bulliform or motor cells. They are large, bubble-shaped, empty colourless epidermal cells that occur in groups on the upper surface of the leaves of many grasses. Loss of turgor pressure in these cells causes leaves to "roll up" during water stress.
Anatomy of Flowering Plants
271406
Which of the following are present in monocot root?
1 conjoint, collateral, open polyarch vascular bundle.
(d) The internal structure of a typical monocotyledon root is similar to dicotyledon root. Number of xylem bundles are more than six (polyarch) in monocotyledon root (exceptionally the number of xylem bundles are two to six in onion). Pith is well developed in monocotyledon root. Monocot roots do not undergo secondary growth.
Anatomy of Flowering Plants
271407
Where do the casparian bands occur?
1 Epidermis
2 Endodermis
3 Pericycle
4 Phloem
Explanation:
(b) Endodermis or innermost layer of cortex has casparian strips in roots. It is called starch sheath in dicot stems. It separates cortex from stele. The cell walls are thickened at the corners in angular collenchyma.
271404
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
1 presence of cortex.
2 position of protoxylem.
3 absence of secondary xylem.
4 absence of secondary phloem.
Explanation:
(b) Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by position of cortex. Protoxylem is the first-formed xylem developing from procambium and consisting of narrow cells with annular, spiral, or scalariform wall thickenings.
Anatomy of Flowering Plants
271405
Which one of the following option is correct about bulliform/motor cell ?
1 It is seen in grasses.
2 It is large-sized, thin-walled colourless, vacuolate cells on the adaxial surface.
3 It helps in rolling of leaf to minimise water loss when it is flaccid.
4 All of the above
Explanation:
(d) All the statements are correct regarding Bulliform or motor cells. They are large, bubble-shaped, empty colourless epidermal cells that occur in groups on the upper surface of the leaves of many grasses. Loss of turgor pressure in these cells causes leaves to "roll up" during water stress.
Anatomy of Flowering Plants
271406
Which of the following are present in monocot root?
1 conjoint, collateral, open polyarch vascular bundle.
(d) The internal structure of a typical monocotyledon root is similar to dicotyledon root. Number of xylem bundles are more than six (polyarch) in monocotyledon root (exceptionally the number of xylem bundles are two to six in onion). Pith is well developed in monocotyledon root. Monocot roots do not undergo secondary growth.
Anatomy of Flowering Plants
271407
Where do the casparian bands occur?
1 Epidermis
2 Endodermis
3 Pericycle
4 Phloem
Explanation:
(b) Endodermis or innermost layer of cortex has casparian strips in roots. It is called starch sheath in dicot stems. It separates cortex from stele. The cell walls are thickened at the corners in angular collenchyma.