The cells of a prothallus contain chloroplasts. Therefore, it is photosynthetic and independent. The prothallus (gametophyte) produces male sex organs (antheridia) and female sex organs (archegonia) during sexual reproduction. These develop on the lower surface facing the soil. It is generally monoecious and the sex organs are developed on the ventral surface. Sex organs are exposed directly to moisture which is needed for the development and dehiscence.
AP EAMCET-2001
Plant kingdom
259471
Reduction (meiotic) division in Pteridophyta occurs:
1 during gamete formation
2 after spore formation
3 during spore formation
4 after gamete formation
Explanation:
Meiosis in pteridophytes occur during spore formation. It is the turning point in the life cycle. The diploid sporophytic generation ends with meiosis and the new haploid gametophytic generation begins with the formation of haploid spore. The spore (n) on germination produces haploid fern prothallus.
AFMC-2004
Plant kingdom
259472
Which of the following is found in fern?
1 Eustele
2 Atactostele
3 Dictyostele
4 None of these
Explanation:
The dictyostele is found in fern. It is a hollow stele with overlapping leaf gaps so the vascular cylinder appears as a hollow network of strands called meristeles.
CG PMT-2006
Plant kingdom
259473
In ferns and mosses, movement of antherozoids towards female component is called.
1 phototaxis
2 chemonastic
3 hydrotropism
4 thigmotropism
Explanation:
The antherozoids of ferns and mosses are stimulated by special chemicals this movement is known as chemonastic. It is the nastic movement shown by plant in response to external chemical stimuli. The antherozoids are attracted towards archegonia in a fern plant due to chemonastic movement.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
Plant kingdom
259470
Sex organs in Pteris are produced on:
1 dorsal side of the prothallus
2 ventral side of the prothallus
3 margins of the fertile leaflets
4 apices of sporophytic stem
Explanation:
The cells of a prothallus contain chloroplasts. Therefore, it is photosynthetic and independent. The prothallus (gametophyte) produces male sex organs (antheridia) and female sex organs (archegonia) during sexual reproduction. These develop on the lower surface facing the soil. It is generally monoecious and the sex organs are developed on the ventral surface. Sex organs are exposed directly to moisture which is needed for the development and dehiscence.
AP EAMCET-2001
Plant kingdom
259471
Reduction (meiotic) division in Pteridophyta occurs:
1 during gamete formation
2 after spore formation
3 during spore formation
4 after gamete formation
Explanation:
Meiosis in pteridophytes occur during spore formation. It is the turning point in the life cycle. The diploid sporophytic generation ends with meiosis and the new haploid gametophytic generation begins with the formation of haploid spore. The spore (n) on germination produces haploid fern prothallus.
AFMC-2004
Plant kingdom
259472
Which of the following is found in fern?
1 Eustele
2 Atactostele
3 Dictyostele
4 None of these
Explanation:
The dictyostele is found in fern. It is a hollow stele with overlapping leaf gaps so the vascular cylinder appears as a hollow network of strands called meristeles.
CG PMT-2006
Plant kingdom
259473
In ferns and mosses, movement of antherozoids towards female component is called.
1 phototaxis
2 chemonastic
3 hydrotropism
4 thigmotropism
Explanation:
The antherozoids of ferns and mosses are stimulated by special chemicals this movement is known as chemonastic. It is the nastic movement shown by plant in response to external chemical stimuli. The antherozoids are attracted towards archegonia in a fern plant due to chemonastic movement.
The cells of a prothallus contain chloroplasts. Therefore, it is photosynthetic and independent. The prothallus (gametophyte) produces male sex organs (antheridia) and female sex organs (archegonia) during sexual reproduction. These develop on the lower surface facing the soil. It is generally monoecious and the sex organs are developed on the ventral surface. Sex organs are exposed directly to moisture which is needed for the development and dehiscence.
AP EAMCET-2001
Plant kingdom
259471
Reduction (meiotic) division in Pteridophyta occurs:
1 during gamete formation
2 after spore formation
3 during spore formation
4 after gamete formation
Explanation:
Meiosis in pteridophytes occur during spore formation. It is the turning point in the life cycle. The diploid sporophytic generation ends with meiosis and the new haploid gametophytic generation begins with the formation of haploid spore. The spore (n) on germination produces haploid fern prothallus.
AFMC-2004
Plant kingdom
259472
Which of the following is found in fern?
1 Eustele
2 Atactostele
3 Dictyostele
4 None of these
Explanation:
The dictyostele is found in fern. It is a hollow stele with overlapping leaf gaps so the vascular cylinder appears as a hollow network of strands called meristeles.
CG PMT-2006
Plant kingdom
259473
In ferns and mosses, movement of antherozoids towards female component is called.
1 phototaxis
2 chemonastic
3 hydrotropism
4 thigmotropism
Explanation:
The antherozoids of ferns and mosses are stimulated by special chemicals this movement is known as chemonastic. It is the nastic movement shown by plant in response to external chemical stimuli. The antherozoids are attracted towards archegonia in a fern plant due to chemonastic movement.
The cells of a prothallus contain chloroplasts. Therefore, it is photosynthetic and independent. The prothallus (gametophyte) produces male sex organs (antheridia) and female sex organs (archegonia) during sexual reproduction. These develop on the lower surface facing the soil. It is generally monoecious and the sex organs are developed on the ventral surface. Sex organs are exposed directly to moisture which is needed for the development and dehiscence.
AP EAMCET-2001
Plant kingdom
259471
Reduction (meiotic) division in Pteridophyta occurs:
1 during gamete formation
2 after spore formation
3 during spore formation
4 after gamete formation
Explanation:
Meiosis in pteridophytes occur during spore formation. It is the turning point in the life cycle. The diploid sporophytic generation ends with meiosis and the new haploid gametophytic generation begins with the formation of haploid spore. The spore (n) on germination produces haploid fern prothallus.
AFMC-2004
Plant kingdom
259472
Which of the following is found in fern?
1 Eustele
2 Atactostele
3 Dictyostele
4 None of these
Explanation:
The dictyostele is found in fern. It is a hollow stele with overlapping leaf gaps so the vascular cylinder appears as a hollow network of strands called meristeles.
CG PMT-2006
Plant kingdom
259473
In ferns and mosses, movement of antherozoids towards female component is called.
1 phototaxis
2 chemonastic
3 hydrotropism
4 thigmotropism
Explanation:
The antherozoids of ferns and mosses are stimulated by special chemicals this movement is known as chemonastic. It is the nastic movement shown by plant in response to external chemical stimuli. The antherozoids are attracted towards archegonia in a fern plant due to chemonastic movement.