259466
If number of chromosome in foot of fern embryo is 8 , what should be the number in its spores?
1 4
2 8
3 23
4 16
Explanation:
The number of chromosomes in the foot of a fern embryo $(2 n)=8$; The number of spores $(n)=4$. In ferns the embryo is a diploid structure as it is formed by the fusion of gametes while the spores are haploid structures formed due to meiosis in diploid spore mother cell.
Haryana PMT-2004 / Manipal-2003
Plant kingdom
259467
A mature ligule having a prominent basal portion is called
1 trrichocyst
2 heterocyst
3 rhizophore
4 glossopodium
Explanation:
An elongated cell structure that is found at the base of ligule is called glossopodium. It is found in many species Selaginella. In Sellaginella, glossopodium is a bulb-like minute structure which is found at the base of the ligule.
Manipal-2013
Plant kingdom
259468
Flagellate male gametes are present in the following except:
1 Funaria
2 Dryopteris
3 Pinus
4 none of these
Explanation:
In Pinus, after pollination, the pollen tube grows and the generative cells divides to form a stalk cell and body cell. The body cell then divides to form two non-flagellate, male gametes.
JIPMER-1995
Plant kingdom
259469
Sporophyte of Dryopteris produces:
1 seeds
2 spores
3 gametes
4 none of these
Explanation:
Sporophyte is a diploid, multicellular spore producing phase in the life cycle of the plant body. The haploid spore which give rise to the gametophyte which is the monoecious prothallus and bears sex organs on its ventral side. After fertilization, they give rise to the sporophyte which is the dominant asexual member in the life cycle of the plant.
259466
If number of chromosome in foot of fern embryo is 8 , what should be the number in its spores?
1 4
2 8
3 23
4 16
Explanation:
The number of chromosomes in the foot of a fern embryo $(2 n)=8$; The number of spores $(n)=4$. In ferns the embryo is a diploid structure as it is formed by the fusion of gametes while the spores are haploid structures formed due to meiosis in diploid spore mother cell.
Haryana PMT-2004 / Manipal-2003
Plant kingdom
259467
A mature ligule having a prominent basal portion is called
1 trrichocyst
2 heterocyst
3 rhizophore
4 glossopodium
Explanation:
An elongated cell structure that is found at the base of ligule is called glossopodium. It is found in many species Selaginella. In Sellaginella, glossopodium is a bulb-like minute structure which is found at the base of the ligule.
Manipal-2013
Plant kingdom
259468
Flagellate male gametes are present in the following except:
1 Funaria
2 Dryopteris
3 Pinus
4 none of these
Explanation:
In Pinus, after pollination, the pollen tube grows and the generative cells divides to form a stalk cell and body cell. The body cell then divides to form two non-flagellate, male gametes.
JIPMER-1995
Plant kingdom
259469
Sporophyte of Dryopteris produces:
1 seeds
2 spores
3 gametes
4 none of these
Explanation:
Sporophyte is a diploid, multicellular spore producing phase in the life cycle of the plant body. The haploid spore which give rise to the gametophyte which is the monoecious prothallus and bears sex organs on its ventral side. After fertilization, they give rise to the sporophyte which is the dominant asexual member in the life cycle of the plant.
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Plant kingdom
259466
If number of chromosome in foot of fern embryo is 8 , what should be the number in its spores?
1 4
2 8
3 23
4 16
Explanation:
The number of chromosomes in the foot of a fern embryo $(2 n)=8$; The number of spores $(n)=4$. In ferns the embryo is a diploid structure as it is formed by the fusion of gametes while the spores are haploid structures formed due to meiosis in diploid spore mother cell.
Haryana PMT-2004 / Manipal-2003
Plant kingdom
259467
A mature ligule having a prominent basal portion is called
1 trrichocyst
2 heterocyst
3 rhizophore
4 glossopodium
Explanation:
An elongated cell structure that is found at the base of ligule is called glossopodium. It is found in many species Selaginella. In Sellaginella, glossopodium is a bulb-like minute structure which is found at the base of the ligule.
Manipal-2013
Plant kingdom
259468
Flagellate male gametes are present in the following except:
1 Funaria
2 Dryopteris
3 Pinus
4 none of these
Explanation:
In Pinus, after pollination, the pollen tube grows and the generative cells divides to form a stalk cell and body cell. The body cell then divides to form two non-flagellate, male gametes.
JIPMER-1995
Plant kingdom
259469
Sporophyte of Dryopteris produces:
1 seeds
2 spores
3 gametes
4 none of these
Explanation:
Sporophyte is a diploid, multicellular spore producing phase in the life cycle of the plant body. The haploid spore which give rise to the gametophyte which is the monoecious prothallus and bears sex organs on its ventral side. After fertilization, they give rise to the sporophyte which is the dominant asexual member in the life cycle of the plant.
259466
If number of chromosome in foot of fern embryo is 8 , what should be the number in its spores?
1 4
2 8
3 23
4 16
Explanation:
The number of chromosomes in the foot of a fern embryo $(2 n)=8$; The number of spores $(n)=4$. In ferns the embryo is a diploid structure as it is formed by the fusion of gametes while the spores are haploid structures formed due to meiosis in diploid spore mother cell.
Haryana PMT-2004 / Manipal-2003
Plant kingdom
259467
A mature ligule having a prominent basal portion is called
1 trrichocyst
2 heterocyst
3 rhizophore
4 glossopodium
Explanation:
An elongated cell structure that is found at the base of ligule is called glossopodium. It is found in many species Selaginella. In Sellaginella, glossopodium is a bulb-like minute structure which is found at the base of the ligule.
Manipal-2013
Plant kingdom
259468
Flagellate male gametes are present in the following except:
1 Funaria
2 Dryopteris
3 Pinus
4 none of these
Explanation:
In Pinus, after pollination, the pollen tube grows and the generative cells divides to form a stalk cell and body cell. The body cell then divides to form two non-flagellate, male gametes.
JIPMER-1995
Plant kingdom
259469
Sporophyte of Dryopteris produces:
1 seeds
2 spores
3 gametes
4 none of these
Explanation:
Sporophyte is a diploid, multicellular spore producing phase in the life cycle of the plant body. The haploid spore which give rise to the gametophyte which is the monoecious prothallus and bears sex organs on its ventral side. After fertilization, they give rise to the sporophyte which is the dominant asexual member in the life cycle of the plant.