262555
The pollen grains of rice and wheat lose their viability in minutes of their release.
1 30
2 10
3 60
4 90
Explanation:
The pollen grain is the first cell generation of gametophyte, pollen grains are produced within the anther of the flower, each pollen grain contains male gametes necessary for fertilization. The pollen grains lose their viability within a period of time which varies from plant to plant. The viability of the pollen grains of rice and wheat is 30 minutes. It depends upon environmental conditions of temperature and humidity.
AIIMS-2013
Sexual Reproduction in Flowering Plants
262560
Epipetalous and syngenesious stamen occurs in-
1 Solanaceae
2 Brassicaceae
3 Fabaceae
4 Asteraceae
Explanation:
In asteraceae family (Compositae family) plants mostly herbs or shrubs or rarely trees. Leaves alternate rarely opposite, exstipulate, rarely stipulate, inflorescence capitulum or head surrounded by involucres of bracts, ray and disc florates Syngenesious condition is found in this family. It is the condition when stamens are united by their anthers (filaments free). Epipetalous conditions is also fund in family asteraceae. If stamens arise from the petals, they are called epipetalous.
AP EAMCET-24.09.2020 Shift-I
Sexual Reproduction in Flowering Plants
262563
Exine of pollen grain is made up of
1 Pectocellulose
2 lignocellulose
3 sporopollenin
4 pollen kit
Explanation:
Exine of pollen grains are made up of sporopollenin. Spropollenin is the most resistant known biological material, which is not degraded by any enzyme. Pollen grains is male gamete with two layerd cell wall. Outer covering is tough called exine and inner covering is intine. Pectocellulose is formed by the fusion of pectin and cellulose fibres. It is present in intine. Pollen kit is the oily and sticky layer around the exine of pollen grains.
262569
Which of the following represents the male gamete?
1 Endosperm
2 Synergids
3 Pollen grain
4 Antipodals
Explanation:
Pollen grains represent the male gamete. Stamen is the male reproductive part of flower which contains pollen grains. Synergid and antipodal cells are the part of mega-sporangium i.e. ovule of angiosperms. In ovule synergid is present at micropylar end and antipodal cells are present at chalazal end. Endosperm is formed after the fertilization and it provide nutrition to the seeds.
262555
The pollen grains of rice and wheat lose their viability in minutes of their release.
1 30
2 10
3 60
4 90
Explanation:
The pollen grain is the first cell generation of gametophyte, pollen grains are produced within the anther of the flower, each pollen grain contains male gametes necessary for fertilization. The pollen grains lose their viability within a period of time which varies from plant to plant. The viability of the pollen grains of rice and wheat is 30 minutes. It depends upon environmental conditions of temperature and humidity.
AIIMS-2013
Sexual Reproduction in Flowering Plants
262560
Epipetalous and syngenesious stamen occurs in-
1 Solanaceae
2 Brassicaceae
3 Fabaceae
4 Asteraceae
Explanation:
In asteraceae family (Compositae family) plants mostly herbs or shrubs or rarely trees. Leaves alternate rarely opposite, exstipulate, rarely stipulate, inflorescence capitulum or head surrounded by involucres of bracts, ray and disc florates Syngenesious condition is found in this family. It is the condition when stamens are united by their anthers (filaments free). Epipetalous conditions is also fund in family asteraceae. If stamens arise from the petals, they are called epipetalous.
AP EAMCET-24.09.2020 Shift-I
Sexual Reproduction in Flowering Plants
262563
Exine of pollen grain is made up of
1 Pectocellulose
2 lignocellulose
3 sporopollenin
4 pollen kit
Explanation:
Exine of pollen grains are made up of sporopollenin. Spropollenin is the most resistant known biological material, which is not degraded by any enzyme. Pollen grains is male gamete with two layerd cell wall. Outer covering is tough called exine and inner covering is intine. Pectocellulose is formed by the fusion of pectin and cellulose fibres. It is present in intine. Pollen kit is the oily and sticky layer around the exine of pollen grains.
262569
Which of the following represents the male gamete?
1 Endosperm
2 Synergids
3 Pollen grain
4 Antipodals
Explanation:
Pollen grains represent the male gamete. Stamen is the male reproductive part of flower which contains pollen grains. Synergid and antipodal cells are the part of mega-sporangium i.e. ovule of angiosperms. In ovule synergid is present at micropylar end and antipodal cells are present at chalazal end. Endosperm is formed after the fertilization and it provide nutrition to the seeds.
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Sexual Reproduction in Flowering Plants
262555
The pollen grains of rice and wheat lose their viability in minutes of their release.
1 30
2 10
3 60
4 90
Explanation:
The pollen grain is the first cell generation of gametophyte, pollen grains are produced within the anther of the flower, each pollen grain contains male gametes necessary for fertilization. The pollen grains lose their viability within a period of time which varies from plant to plant. The viability of the pollen grains of rice and wheat is 30 minutes. It depends upon environmental conditions of temperature and humidity.
AIIMS-2013
Sexual Reproduction in Flowering Plants
262560
Epipetalous and syngenesious stamen occurs in-
1 Solanaceae
2 Brassicaceae
3 Fabaceae
4 Asteraceae
Explanation:
In asteraceae family (Compositae family) plants mostly herbs or shrubs or rarely trees. Leaves alternate rarely opposite, exstipulate, rarely stipulate, inflorescence capitulum or head surrounded by involucres of bracts, ray and disc florates Syngenesious condition is found in this family. It is the condition when stamens are united by their anthers (filaments free). Epipetalous conditions is also fund in family asteraceae. If stamens arise from the petals, they are called epipetalous.
AP EAMCET-24.09.2020 Shift-I
Sexual Reproduction in Flowering Plants
262563
Exine of pollen grain is made up of
1 Pectocellulose
2 lignocellulose
3 sporopollenin
4 pollen kit
Explanation:
Exine of pollen grains are made up of sporopollenin. Spropollenin is the most resistant known biological material, which is not degraded by any enzyme. Pollen grains is male gamete with two layerd cell wall. Outer covering is tough called exine and inner covering is intine. Pectocellulose is formed by the fusion of pectin and cellulose fibres. It is present in intine. Pollen kit is the oily and sticky layer around the exine of pollen grains.
262569
Which of the following represents the male gamete?
1 Endosperm
2 Synergids
3 Pollen grain
4 Antipodals
Explanation:
Pollen grains represent the male gamete. Stamen is the male reproductive part of flower which contains pollen grains. Synergid and antipodal cells are the part of mega-sporangium i.e. ovule of angiosperms. In ovule synergid is present at micropylar end and antipodal cells are present at chalazal end. Endosperm is formed after the fertilization and it provide nutrition to the seeds.
262555
The pollen grains of rice and wheat lose their viability in minutes of their release.
1 30
2 10
3 60
4 90
Explanation:
The pollen grain is the first cell generation of gametophyte, pollen grains are produced within the anther of the flower, each pollen grain contains male gametes necessary for fertilization. The pollen grains lose their viability within a period of time which varies from plant to plant. The viability of the pollen grains of rice and wheat is 30 minutes. It depends upon environmental conditions of temperature and humidity.
AIIMS-2013
Sexual Reproduction in Flowering Plants
262560
Epipetalous and syngenesious stamen occurs in-
1 Solanaceae
2 Brassicaceae
3 Fabaceae
4 Asteraceae
Explanation:
In asteraceae family (Compositae family) plants mostly herbs or shrubs or rarely trees. Leaves alternate rarely opposite, exstipulate, rarely stipulate, inflorescence capitulum or head surrounded by involucres of bracts, ray and disc florates Syngenesious condition is found in this family. It is the condition when stamens are united by their anthers (filaments free). Epipetalous conditions is also fund in family asteraceae. If stamens arise from the petals, they are called epipetalous.
AP EAMCET-24.09.2020 Shift-I
Sexual Reproduction in Flowering Plants
262563
Exine of pollen grain is made up of
1 Pectocellulose
2 lignocellulose
3 sporopollenin
4 pollen kit
Explanation:
Exine of pollen grains are made up of sporopollenin. Spropollenin is the most resistant known biological material, which is not degraded by any enzyme. Pollen grains is male gamete with two layerd cell wall. Outer covering is tough called exine and inner covering is intine. Pectocellulose is formed by the fusion of pectin and cellulose fibres. It is present in intine. Pollen kit is the oily and sticky layer around the exine of pollen grains.
262569
Which of the following represents the male gamete?
1 Endosperm
2 Synergids
3 Pollen grain
4 Antipodals
Explanation:
Pollen grains represent the male gamete. Stamen is the male reproductive part of flower which contains pollen grains. Synergid and antipodal cells are the part of mega-sporangium i.e. ovule of angiosperms. In ovule synergid is present at micropylar end and antipodal cells are present at chalazal end. Endosperm is formed after the fertilization and it provide nutrition to the seeds.