259418
Which of the following are heterosporous pteridophytes? I. Lycopodium II. Selaginella III. Equisetum IV. Salvinia
1 I and II only
2 II and III only
3 III and IV only
4 II and IV only
5 I and IV only
Explanation:
Selaginella \& Salvinia are heterosporous pteridophyta. Heterospory is the production of spores of two different sizes \& of two different developmental patternes - smaller male or microspores and larger female or megaspore. Heterospory is the most important evolutionary development in vascular plants because it has ultimately led to seed development.
Kerala PMT-2014
Plant kingdom
259419
Prothallus of the fern produces
1 spores
2 gametes
3 Both (a) and (b)
4 cones
Explanation:
Prothallus is the gametophyte of the plant that is they are responsible for producing the gametes At maturity, regions of prothallus develop into small separate sexual organ. Antheridia produces the male sex cells and archegonia produces the female sex cells.
JIPMER-2012 / BHU PMT (Screening)-2009
Plant kingdom
259420
In ferns, Meiosis takes place at the time of:
1 Spore formation
2 Spore germination
3 Gamete formation
4 Antheridia and archegonia formation
Explanation:
Spores are present inside the sporangium which are formed by reduction division and spores are haploid in nature and germinate to produce a prothallus that represents the gametophytic generation. Antheridium and archegonia are borne on this prothallus. Thus, meiosis takes place at the stage of spore formation.
AIPMT-2000
Plant kingdom
259421
Which one of the following is a correct statement?
1 Antheridiophores and archegoniophores are present in pteridophytes
2 Origin of seed habit can be traced in pteridophytes
3 Pteridophyte gametophyte has a protonemal and leafy stage
4 In gymnosperms female gametophyte is free living
Explanation:
The origin of seed habit can be traced in pteridophytes. The development of zygote into young embryos takes place in the female gametophyte. This event is the precursor to the seed habit consider into an step of evolution.
AIPMT (Screening)-2012
Plant kingdom
259464
The prothallus of Pteris is mostly:
1 dioecious
2 monoecious
3 synoecious
4 protogynous
Explanation:
The prothallus of Pteris is mostly monoecious. It carries sex organs, including male antheridia and female archegonia. It is autotrophic in nature. It is thick in one cell normally formed by the heart or kidney and has no roots, stems or leaves, but it has rhizoids.
259418
Which of the following are heterosporous pteridophytes? I. Lycopodium II. Selaginella III. Equisetum IV. Salvinia
1 I and II only
2 II and III only
3 III and IV only
4 II and IV only
5 I and IV only
Explanation:
Selaginella \& Salvinia are heterosporous pteridophyta. Heterospory is the production of spores of two different sizes \& of two different developmental patternes - smaller male or microspores and larger female or megaspore. Heterospory is the most important evolutionary development in vascular plants because it has ultimately led to seed development.
Kerala PMT-2014
Plant kingdom
259419
Prothallus of the fern produces
1 spores
2 gametes
3 Both (a) and (b)
4 cones
Explanation:
Prothallus is the gametophyte of the plant that is they are responsible for producing the gametes At maturity, regions of prothallus develop into small separate sexual organ. Antheridia produces the male sex cells and archegonia produces the female sex cells.
JIPMER-2012 / BHU PMT (Screening)-2009
Plant kingdom
259420
In ferns, Meiosis takes place at the time of:
1 Spore formation
2 Spore germination
3 Gamete formation
4 Antheridia and archegonia formation
Explanation:
Spores are present inside the sporangium which are formed by reduction division and spores are haploid in nature and germinate to produce a prothallus that represents the gametophytic generation. Antheridium and archegonia are borne on this prothallus. Thus, meiosis takes place at the stage of spore formation.
AIPMT-2000
Plant kingdom
259421
Which one of the following is a correct statement?
1 Antheridiophores and archegoniophores are present in pteridophytes
2 Origin of seed habit can be traced in pteridophytes
3 Pteridophyte gametophyte has a protonemal and leafy stage
4 In gymnosperms female gametophyte is free living
Explanation:
The origin of seed habit can be traced in pteridophytes. The development of zygote into young embryos takes place in the female gametophyte. This event is the precursor to the seed habit consider into an step of evolution.
AIPMT (Screening)-2012
Plant kingdom
259464
The prothallus of Pteris is mostly:
1 dioecious
2 monoecious
3 synoecious
4 protogynous
Explanation:
The prothallus of Pteris is mostly monoecious. It carries sex organs, including male antheridia and female archegonia. It is autotrophic in nature. It is thick in one cell normally formed by the heart or kidney and has no roots, stems or leaves, but it has rhizoids.
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Plant kingdom
259418
Which of the following are heterosporous pteridophytes? I. Lycopodium II. Selaginella III. Equisetum IV. Salvinia
1 I and II only
2 II and III only
3 III and IV only
4 II and IV only
5 I and IV only
Explanation:
Selaginella \& Salvinia are heterosporous pteridophyta. Heterospory is the production of spores of two different sizes \& of two different developmental patternes - smaller male or microspores and larger female or megaspore. Heterospory is the most important evolutionary development in vascular plants because it has ultimately led to seed development.
Kerala PMT-2014
Plant kingdom
259419
Prothallus of the fern produces
1 spores
2 gametes
3 Both (a) and (b)
4 cones
Explanation:
Prothallus is the gametophyte of the plant that is they are responsible for producing the gametes At maturity, regions of prothallus develop into small separate sexual organ. Antheridia produces the male sex cells and archegonia produces the female sex cells.
JIPMER-2012 / BHU PMT (Screening)-2009
Plant kingdom
259420
In ferns, Meiosis takes place at the time of:
1 Spore formation
2 Spore germination
3 Gamete formation
4 Antheridia and archegonia formation
Explanation:
Spores are present inside the sporangium which are formed by reduction division and spores are haploid in nature and germinate to produce a prothallus that represents the gametophytic generation. Antheridium and archegonia are borne on this prothallus. Thus, meiosis takes place at the stage of spore formation.
AIPMT-2000
Plant kingdom
259421
Which one of the following is a correct statement?
1 Antheridiophores and archegoniophores are present in pteridophytes
2 Origin of seed habit can be traced in pteridophytes
3 Pteridophyte gametophyte has a protonemal and leafy stage
4 In gymnosperms female gametophyte is free living
Explanation:
The origin of seed habit can be traced in pteridophytes. The development of zygote into young embryos takes place in the female gametophyte. This event is the precursor to the seed habit consider into an step of evolution.
AIPMT (Screening)-2012
Plant kingdom
259464
The prothallus of Pteris is mostly:
1 dioecious
2 monoecious
3 synoecious
4 protogynous
Explanation:
The prothallus of Pteris is mostly monoecious. It carries sex organs, including male antheridia and female archegonia. It is autotrophic in nature. It is thick in one cell normally formed by the heart or kidney and has no roots, stems or leaves, but it has rhizoids.
259418
Which of the following are heterosporous pteridophytes? I. Lycopodium II. Selaginella III. Equisetum IV. Salvinia
1 I and II only
2 II and III only
3 III and IV only
4 II and IV only
5 I and IV only
Explanation:
Selaginella \& Salvinia are heterosporous pteridophyta. Heterospory is the production of spores of two different sizes \& of two different developmental patternes - smaller male or microspores and larger female or megaspore. Heterospory is the most important evolutionary development in vascular plants because it has ultimately led to seed development.
Kerala PMT-2014
Plant kingdom
259419
Prothallus of the fern produces
1 spores
2 gametes
3 Both (a) and (b)
4 cones
Explanation:
Prothallus is the gametophyte of the plant that is they are responsible for producing the gametes At maturity, regions of prothallus develop into small separate sexual organ. Antheridia produces the male sex cells and archegonia produces the female sex cells.
JIPMER-2012 / BHU PMT (Screening)-2009
Plant kingdom
259420
In ferns, Meiosis takes place at the time of:
1 Spore formation
2 Spore germination
3 Gamete formation
4 Antheridia and archegonia formation
Explanation:
Spores are present inside the sporangium which are formed by reduction division and spores are haploid in nature and germinate to produce a prothallus that represents the gametophytic generation. Antheridium and archegonia are borne on this prothallus. Thus, meiosis takes place at the stage of spore formation.
AIPMT-2000
Plant kingdom
259421
Which one of the following is a correct statement?
1 Antheridiophores and archegoniophores are present in pteridophytes
2 Origin of seed habit can be traced in pteridophytes
3 Pteridophyte gametophyte has a protonemal and leafy stage
4 In gymnosperms female gametophyte is free living
Explanation:
The origin of seed habit can be traced in pteridophytes. The development of zygote into young embryos takes place in the female gametophyte. This event is the precursor to the seed habit consider into an step of evolution.
AIPMT (Screening)-2012
Plant kingdom
259464
The prothallus of Pteris is mostly:
1 dioecious
2 monoecious
3 synoecious
4 protogynous
Explanation:
The prothallus of Pteris is mostly monoecious. It carries sex organs, including male antheridia and female archegonia. It is autotrophic in nature. It is thick in one cell normally formed by the heart or kidney and has no roots, stems or leaves, but it has rhizoids.
259418
Which of the following are heterosporous pteridophytes? I. Lycopodium II. Selaginella III. Equisetum IV. Salvinia
1 I and II only
2 II and III only
3 III and IV only
4 II and IV only
5 I and IV only
Explanation:
Selaginella \& Salvinia are heterosporous pteridophyta. Heterospory is the production of spores of two different sizes \& of two different developmental patternes - smaller male or microspores and larger female or megaspore. Heterospory is the most important evolutionary development in vascular plants because it has ultimately led to seed development.
Kerala PMT-2014
Plant kingdom
259419
Prothallus of the fern produces
1 spores
2 gametes
3 Both (a) and (b)
4 cones
Explanation:
Prothallus is the gametophyte of the plant that is they are responsible for producing the gametes At maturity, regions of prothallus develop into small separate sexual organ. Antheridia produces the male sex cells and archegonia produces the female sex cells.
JIPMER-2012 / BHU PMT (Screening)-2009
Plant kingdom
259420
In ferns, Meiosis takes place at the time of:
1 Spore formation
2 Spore germination
3 Gamete formation
4 Antheridia and archegonia formation
Explanation:
Spores are present inside the sporangium which are formed by reduction division and spores are haploid in nature and germinate to produce a prothallus that represents the gametophytic generation. Antheridium and archegonia are borne on this prothallus. Thus, meiosis takes place at the stage of spore formation.
AIPMT-2000
Plant kingdom
259421
Which one of the following is a correct statement?
1 Antheridiophores and archegoniophores are present in pteridophytes
2 Origin of seed habit can be traced in pteridophytes
3 Pteridophyte gametophyte has a protonemal and leafy stage
4 In gymnosperms female gametophyte is free living
Explanation:
The origin of seed habit can be traced in pteridophytes. The development of zygote into young embryos takes place in the female gametophyte. This event is the precursor to the seed habit consider into an step of evolution.
AIPMT (Screening)-2012
Plant kingdom
259464
The prothallus of Pteris is mostly:
1 dioecious
2 monoecious
3 synoecious
4 protogynous
Explanation:
The prothallus of Pteris is mostly monoecious. It carries sex organs, including male antheridia and female archegonia. It is autotrophic in nature. It is thick in one cell normally formed by the heart or kidney and has no roots, stems or leaves, but it has rhizoids.