286705
Protonema and leafy stage are the predominant stage of the life cycle of
1 moss
2 dicots
3 liverwort
4 gymnosperm
Explanation:
(a) The predominant stage of the moss is the presence of gametophyte which consists of two stages - the first stage is protonema and the second stage is leafy stage. Protonema stage develops directly from the spores and leafy stage develops from the secondary protonema as a lateral bud.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286706
Which of the following statement(s) is/are correct about mosses?
1 The predominant stage of its life cycle is the gametophyte which consists of two stages protonema and leafy stages.
2 Leafy stage are attached to the soil through multicellular and branched rhizoids.
3 Sex organs-antheridia and archegonia are produced at the apex of the leafy shoots.
4 All of the above
Explanation:
(d)All the given statements are correct.
NCERT Page-35
PLANT KINGDOM(NCERT)
286696
A bryophyte differs from pteridophytes in having
1 archegonia.
2 lack of vascular tissue.
3 swimming antherozoids.
4 independent gametophytes.
Explanation:
(b)Bryophytes completely lack vascular tissue system and absorb water by generally body surface. Whereas pteridophytes are the first terrestrial plants to possess vascular tissues -xylem and phloem.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286697
Protonema
1 is a stage of gametophytic generation.
2 is a creeping, green, branched and develops directly from a spore.
3 Filamentous stage.
4 All of the above
Explanation:
(a) A protonema is a creeping, green, filamentous, thread-like chain of cells which is produced by the germination of the spores and forms the earliest stage (the haploid phase) of a bryophyte life cycle. When a moss first grows from the spore, it grows as a protonema which develops into a leafy gametophore.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286698
Mosses are of great ecological importance because of
1 its contribution to prevent soil erosion.
2 its contribution in ecological succession.
3 its capability to remove $\text{CO}$ from the atmosphere.
4 both (a) and (b)
Explanation:
(d)Mosses along with lichens are the first organisms to colonise rocks and hence, are of great ecological importance. They decompose rocks making the substrate suitable for the growth of higher plants. Since mosses form dense mats on the soil, they reduce the impact of falling rain and prevent soil - erosion.
286705
Protonema and leafy stage are the predominant stage of the life cycle of
1 moss
2 dicots
3 liverwort
4 gymnosperm
Explanation:
(a) The predominant stage of the moss is the presence of gametophyte which consists of two stages - the first stage is protonema and the second stage is leafy stage. Protonema stage develops directly from the spores and leafy stage develops from the secondary protonema as a lateral bud.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286706
Which of the following statement(s) is/are correct about mosses?
1 The predominant stage of its life cycle is the gametophyte which consists of two stages protonema and leafy stages.
2 Leafy stage are attached to the soil through multicellular and branched rhizoids.
3 Sex organs-antheridia and archegonia are produced at the apex of the leafy shoots.
4 All of the above
Explanation:
(d)All the given statements are correct.
NCERT Page-35
PLANT KINGDOM(NCERT)
286696
A bryophyte differs from pteridophytes in having
1 archegonia.
2 lack of vascular tissue.
3 swimming antherozoids.
4 independent gametophytes.
Explanation:
(b)Bryophytes completely lack vascular tissue system and absorb water by generally body surface. Whereas pteridophytes are the first terrestrial plants to possess vascular tissues -xylem and phloem.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286697
Protonema
1 is a stage of gametophytic generation.
2 is a creeping, green, branched and develops directly from a spore.
3 Filamentous stage.
4 All of the above
Explanation:
(a) A protonema is a creeping, green, filamentous, thread-like chain of cells which is produced by the germination of the spores and forms the earliest stage (the haploid phase) of a bryophyte life cycle. When a moss first grows from the spore, it grows as a protonema which develops into a leafy gametophore.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286698
Mosses are of great ecological importance because of
1 its contribution to prevent soil erosion.
2 its contribution in ecological succession.
3 its capability to remove $\text{CO}$ from the atmosphere.
4 both (a) and (b)
Explanation:
(d)Mosses along with lichens are the first organisms to colonise rocks and hence, are of great ecological importance. They decompose rocks making the substrate suitable for the growth of higher plants. Since mosses form dense mats on the soil, they reduce the impact of falling rain and prevent soil - erosion.
286705
Protonema and leafy stage are the predominant stage of the life cycle of
1 moss
2 dicots
3 liverwort
4 gymnosperm
Explanation:
(a) The predominant stage of the moss is the presence of gametophyte which consists of two stages - the first stage is protonema and the second stage is leafy stage. Protonema stage develops directly from the spores and leafy stage develops from the secondary protonema as a lateral bud.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286706
Which of the following statement(s) is/are correct about mosses?
1 The predominant stage of its life cycle is the gametophyte which consists of two stages protonema and leafy stages.
2 Leafy stage are attached to the soil through multicellular and branched rhizoids.
3 Sex organs-antheridia and archegonia are produced at the apex of the leafy shoots.
4 All of the above
Explanation:
(d)All the given statements are correct.
NCERT Page-35
PLANT KINGDOM(NCERT)
286696
A bryophyte differs from pteridophytes in having
1 archegonia.
2 lack of vascular tissue.
3 swimming antherozoids.
4 independent gametophytes.
Explanation:
(b)Bryophytes completely lack vascular tissue system and absorb water by generally body surface. Whereas pteridophytes are the first terrestrial plants to possess vascular tissues -xylem and phloem.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286697
Protonema
1 is a stage of gametophytic generation.
2 is a creeping, green, branched and develops directly from a spore.
3 Filamentous stage.
4 All of the above
Explanation:
(a) A protonema is a creeping, green, filamentous, thread-like chain of cells which is produced by the germination of the spores and forms the earliest stage (the haploid phase) of a bryophyte life cycle. When a moss first grows from the spore, it grows as a protonema which develops into a leafy gametophore.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286698
Mosses are of great ecological importance because of
1 its contribution to prevent soil erosion.
2 its contribution in ecological succession.
3 its capability to remove $\text{CO}$ from the atmosphere.
4 both (a) and (b)
Explanation:
(d)Mosses along with lichens are the first organisms to colonise rocks and hence, are of great ecological importance. They decompose rocks making the substrate suitable for the growth of higher plants. Since mosses form dense mats on the soil, they reduce the impact of falling rain and prevent soil - erosion.
286705
Protonema and leafy stage are the predominant stage of the life cycle of
1 moss
2 dicots
3 liverwort
4 gymnosperm
Explanation:
(a) The predominant stage of the moss is the presence of gametophyte which consists of two stages - the first stage is protonema and the second stage is leafy stage. Protonema stage develops directly from the spores and leafy stage develops from the secondary protonema as a lateral bud.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286706
Which of the following statement(s) is/are correct about mosses?
1 The predominant stage of its life cycle is the gametophyte which consists of two stages protonema and leafy stages.
2 Leafy stage are attached to the soil through multicellular and branched rhizoids.
3 Sex organs-antheridia and archegonia are produced at the apex of the leafy shoots.
4 All of the above
Explanation:
(d)All the given statements are correct.
NCERT Page-35
PLANT KINGDOM(NCERT)
286696
A bryophyte differs from pteridophytes in having
1 archegonia.
2 lack of vascular tissue.
3 swimming antherozoids.
4 independent gametophytes.
Explanation:
(b)Bryophytes completely lack vascular tissue system and absorb water by generally body surface. Whereas pteridophytes are the first terrestrial plants to possess vascular tissues -xylem and phloem.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286697
Protonema
1 is a stage of gametophytic generation.
2 is a creeping, green, branched and develops directly from a spore.
3 Filamentous stage.
4 All of the above
Explanation:
(a) A protonema is a creeping, green, filamentous, thread-like chain of cells which is produced by the germination of the spores and forms the earliest stage (the haploid phase) of a bryophyte life cycle. When a moss first grows from the spore, it grows as a protonema which develops into a leafy gametophore.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286698
Mosses are of great ecological importance because of
1 its contribution to prevent soil erosion.
2 its contribution in ecological succession.
3 its capability to remove $\text{CO}$ from the atmosphere.
4 both (a) and (b)
Explanation:
(d)Mosses along with lichens are the first organisms to colonise rocks and hence, are of great ecological importance. They decompose rocks making the substrate suitable for the growth of higher plants. Since mosses form dense mats on the soil, they reduce the impact of falling rain and prevent soil - erosion.
286705
Protonema and leafy stage are the predominant stage of the life cycle of
1 moss
2 dicots
3 liverwort
4 gymnosperm
Explanation:
(a) The predominant stage of the moss is the presence of gametophyte which consists of two stages - the first stage is protonema and the second stage is leafy stage. Protonema stage develops directly from the spores and leafy stage develops from the secondary protonema as a lateral bud.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286706
Which of the following statement(s) is/are correct about mosses?
1 The predominant stage of its life cycle is the gametophyte which consists of two stages protonema and leafy stages.
2 Leafy stage are attached to the soil through multicellular and branched rhizoids.
3 Sex organs-antheridia and archegonia are produced at the apex of the leafy shoots.
4 All of the above
Explanation:
(d)All the given statements are correct.
NCERT Page-35
PLANT KINGDOM(NCERT)
286696
A bryophyte differs from pteridophytes in having
1 archegonia.
2 lack of vascular tissue.
3 swimming antherozoids.
4 independent gametophytes.
Explanation:
(b)Bryophytes completely lack vascular tissue system and absorb water by generally body surface. Whereas pteridophytes are the first terrestrial plants to possess vascular tissues -xylem and phloem.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286697
Protonema
1 is a stage of gametophytic generation.
2 is a creeping, green, branched and develops directly from a spore.
3 Filamentous stage.
4 All of the above
Explanation:
(a) A protonema is a creeping, green, filamentous, thread-like chain of cells which is produced by the germination of the spores and forms the earliest stage (the haploid phase) of a bryophyte life cycle. When a moss first grows from the spore, it grows as a protonema which develops into a leafy gametophore.
NCERT Page-36 / N-30
PLANT KINGDOM(NCERT)
286698
Mosses are of great ecological importance because of
1 its contribution to prevent soil erosion.
2 its contribution in ecological succession.
3 its capability to remove $\text{CO}$ from the atmosphere.
4 both (a) and (b)
Explanation:
(d)Mosses along with lichens are the first organisms to colonise rocks and hence, are of great ecological importance. They decompose rocks making the substrate suitable for the growth of higher plants. Since mosses form dense mats on the soil, they reduce the impact of falling rain and prevent soil - erosion.
