271359
Which of following helps bamboo and grasses to elongate?
1 Apical meristems
2 Lateral meristems
3 Secondary meristems
4 Intercalary meristems
Explanation:
(d) Intercalary meristem develops between regions of mature or permanent tissue (at the base of the grass leaf). The cells of this tissue possess the ability to divide and produce new cells, as do apical and lateral meristems. Intercalary meristem helps the bamboo and grasses to elongate.
Anatomy of Flowering Plants
271360
Cells of permanent tissues are specialized
1 functionally.
2 only structurally.
3 both structurally and functionally.
4 for mitosis.
Explanation:
(c) Divisions of cells in both primary as well as secondary meristems, the newly formed cells become structurally and functionally specialized and lose the ability to divide. Such cells are termed as permanent or mature cells and constitute the permanent tissues.
Anatomy of Flowering Plants
271361
Which is not correct about sclereids?
1 These are parenchyma cells with thickened lignified walls.
2 These are elongated and flexible with tapered ends.
3 These are commonly found in the shells of nuts and in the pulp of guava, pear, etc.
4 These are also called stone cells.
Explanation:
(a) Sclereids (stone cells) are sclerenchymatous cells which are lignified, extremely thick walled so that the lumen of the cells is almost obliterated. Sclereids are most abundant in soft tissues like cortex, phloem, medulla, fleshy fruits, seed coats and fruit walls.
Anatomy of Flowering Plants
271362
Lignin is the important constituent in the cell wall of
1 phloem
2 parenchyma
3 xylem
4 cambium
Explanation:
(c) Lignin is the important constituent in the cell wall of xylem. Xylem consists of four different types of elements- tracheids, vessels, and xylem parenchyma and xylem fibres. Wall of tracheids are highly thickened by the deposition of lignin, except at certain points called as pits.
271359
Which of following helps bamboo and grasses to elongate?
1 Apical meristems
2 Lateral meristems
3 Secondary meristems
4 Intercalary meristems
Explanation:
(d) Intercalary meristem develops between regions of mature or permanent tissue (at the base of the grass leaf). The cells of this tissue possess the ability to divide and produce new cells, as do apical and lateral meristems. Intercalary meristem helps the bamboo and grasses to elongate.
Anatomy of Flowering Plants
271360
Cells of permanent tissues are specialized
1 functionally.
2 only structurally.
3 both structurally and functionally.
4 for mitosis.
Explanation:
(c) Divisions of cells in both primary as well as secondary meristems, the newly formed cells become structurally and functionally specialized and lose the ability to divide. Such cells are termed as permanent or mature cells and constitute the permanent tissues.
Anatomy of Flowering Plants
271361
Which is not correct about sclereids?
1 These are parenchyma cells with thickened lignified walls.
2 These are elongated and flexible with tapered ends.
3 These are commonly found in the shells of nuts and in the pulp of guava, pear, etc.
4 These are also called stone cells.
Explanation:
(a) Sclereids (stone cells) are sclerenchymatous cells which are lignified, extremely thick walled so that the lumen of the cells is almost obliterated. Sclereids are most abundant in soft tissues like cortex, phloem, medulla, fleshy fruits, seed coats and fruit walls.
Anatomy of Flowering Plants
271362
Lignin is the important constituent in the cell wall of
1 phloem
2 parenchyma
3 xylem
4 cambium
Explanation:
(c) Lignin is the important constituent in the cell wall of xylem. Xylem consists of four different types of elements- tracheids, vessels, and xylem parenchyma and xylem fibres. Wall of tracheids are highly thickened by the deposition of lignin, except at certain points called as pits.
271359
Which of following helps bamboo and grasses to elongate?
1 Apical meristems
2 Lateral meristems
3 Secondary meristems
4 Intercalary meristems
Explanation:
(d) Intercalary meristem develops between regions of mature or permanent tissue (at the base of the grass leaf). The cells of this tissue possess the ability to divide and produce new cells, as do apical and lateral meristems. Intercalary meristem helps the bamboo and grasses to elongate.
Anatomy of Flowering Plants
271360
Cells of permanent tissues are specialized
1 functionally.
2 only structurally.
3 both structurally and functionally.
4 for mitosis.
Explanation:
(c) Divisions of cells in both primary as well as secondary meristems, the newly formed cells become structurally and functionally specialized and lose the ability to divide. Such cells are termed as permanent or mature cells and constitute the permanent tissues.
Anatomy of Flowering Plants
271361
Which is not correct about sclereids?
1 These are parenchyma cells with thickened lignified walls.
2 These are elongated and flexible with tapered ends.
3 These are commonly found in the shells of nuts and in the pulp of guava, pear, etc.
4 These are also called stone cells.
Explanation:
(a) Sclereids (stone cells) are sclerenchymatous cells which are lignified, extremely thick walled so that the lumen of the cells is almost obliterated. Sclereids are most abundant in soft tissues like cortex, phloem, medulla, fleshy fruits, seed coats and fruit walls.
Anatomy of Flowering Plants
271362
Lignin is the important constituent in the cell wall of
1 phloem
2 parenchyma
3 xylem
4 cambium
Explanation:
(c) Lignin is the important constituent in the cell wall of xylem. Xylem consists of four different types of elements- tracheids, vessels, and xylem parenchyma and xylem fibres. Wall of tracheids are highly thickened by the deposition of lignin, except at certain points called as pits.
271359
Which of following helps bamboo and grasses to elongate?
1 Apical meristems
2 Lateral meristems
3 Secondary meristems
4 Intercalary meristems
Explanation:
(d) Intercalary meristem develops between regions of mature or permanent tissue (at the base of the grass leaf). The cells of this tissue possess the ability to divide and produce new cells, as do apical and lateral meristems. Intercalary meristem helps the bamboo and grasses to elongate.
Anatomy of Flowering Plants
271360
Cells of permanent tissues are specialized
1 functionally.
2 only structurally.
3 both structurally and functionally.
4 for mitosis.
Explanation:
(c) Divisions of cells in both primary as well as secondary meristems, the newly formed cells become structurally and functionally specialized and lose the ability to divide. Such cells are termed as permanent or mature cells and constitute the permanent tissues.
Anatomy of Flowering Plants
271361
Which is not correct about sclereids?
1 These are parenchyma cells with thickened lignified walls.
2 These are elongated and flexible with tapered ends.
3 These are commonly found in the shells of nuts and in the pulp of guava, pear, etc.
4 These are also called stone cells.
Explanation:
(a) Sclereids (stone cells) are sclerenchymatous cells which are lignified, extremely thick walled so that the lumen of the cells is almost obliterated. Sclereids are most abundant in soft tissues like cortex, phloem, medulla, fleshy fruits, seed coats and fruit walls.
Anatomy of Flowering Plants
271362
Lignin is the important constituent in the cell wall of
1 phloem
2 parenchyma
3 xylem
4 cambium
Explanation:
(c) Lignin is the important constituent in the cell wall of xylem. Xylem consists of four different types of elements- tracheids, vessels, and xylem parenchyma and xylem fibres. Wall of tracheids are highly thickened by the deposition of lignin, except at certain points called as pits.
