262579
One of the following has been observed for the first time by Treub:
1 entry of the pollen tube into the ovule through the micropyle in Ottetia
2 entry of the pollen tube into the ovule through chalaza in Casuarina
3 entry of the pollen tube into the ovule through the integuments
4 formation of many pollen tubes from a single pollen grain in Hibiscus
Explanation:
Treub was the first who observed the entry of pollen tube into the ovule through chalaza in casuarinas. If the pollen enters through the micropyle, is called porogamy. When it enters through chalaza,is called chalazogamy. And when it enters through the integumentary layers, it is called as mesogamy.
AP EAMCET-2003
Sexual Reproduction in Flowering Plants
262580
The aleurone layer of rice grain is rich in:
1 vitamin \(\mathrm{A}\)
2 vitamin \(\mathrm{B}\)
3 vitamin \(\mathrm{C}\)
4 vitamin \(\mathrm{E}\)
Explanation:
Aleurone layer is a layer of cells outside the endosperm of cereal grains. It is rich in protein and contain about \(20 \%\) of the vitamin \(\mathrm{B}_{1}, 30 \%\) of the vitamin \(\mathrm{B}_{2}\).
AP EAMCET-2004
Sexual Reproduction in Flowering Plants
262581
Pollen grain wings of pinus are out growths of:
1 exine
2 intine
3 exo-intine
4 sporangial wall
Explanation:
Pollen grains wings of pinus are outgrowths of exine. Exine is outermost layer of pollen grains. And pollen grains wings are characteristic feature of pinus. These wings helps plants in the dispersal of the pollen. These wings allow the pollen to travel further on the wind and reach new area and other plants.
Haryana PMT-2002
Sexual Reproduction in Flowering Plants
262582
A microspore mother cell forms :
1 an ovule
2 pollen grains
3 embryosac
4 a pollen sac
Explanation:
A Microspore mother cells forms pollen grains. The process of formation of microspore from a microspore mother cell through a meiosis is called microsporogenesis. An ovule is a small structure present inside the ovary and contain embryo sac. Embryo sac is female gometophyte of flowering plants. Pollen sacs are present in anthers which produces pollen grains.
262579
One of the following has been observed for the first time by Treub:
1 entry of the pollen tube into the ovule through the micropyle in Ottetia
2 entry of the pollen tube into the ovule through chalaza in Casuarina
3 entry of the pollen tube into the ovule through the integuments
4 formation of many pollen tubes from a single pollen grain in Hibiscus
Explanation:
Treub was the first who observed the entry of pollen tube into the ovule through chalaza in casuarinas. If the pollen enters through the micropyle, is called porogamy. When it enters through chalaza,is called chalazogamy. And when it enters through the integumentary layers, it is called as mesogamy.
AP EAMCET-2003
Sexual Reproduction in Flowering Plants
262580
The aleurone layer of rice grain is rich in:
1 vitamin \(\mathrm{A}\)
2 vitamin \(\mathrm{B}\)
3 vitamin \(\mathrm{C}\)
4 vitamin \(\mathrm{E}\)
Explanation:
Aleurone layer is a layer of cells outside the endosperm of cereal grains. It is rich in protein and contain about \(20 \%\) of the vitamin \(\mathrm{B}_{1}, 30 \%\) of the vitamin \(\mathrm{B}_{2}\).
AP EAMCET-2004
Sexual Reproduction in Flowering Plants
262581
Pollen grain wings of pinus are out growths of:
1 exine
2 intine
3 exo-intine
4 sporangial wall
Explanation:
Pollen grains wings of pinus are outgrowths of exine. Exine is outermost layer of pollen grains. And pollen grains wings are characteristic feature of pinus. These wings helps plants in the dispersal of the pollen. These wings allow the pollen to travel further on the wind and reach new area and other plants.
Haryana PMT-2002
Sexual Reproduction in Flowering Plants
262582
A microspore mother cell forms :
1 an ovule
2 pollen grains
3 embryosac
4 a pollen sac
Explanation:
A Microspore mother cells forms pollen grains. The process of formation of microspore from a microspore mother cell through a meiosis is called microsporogenesis. An ovule is a small structure present inside the ovary and contain embryo sac. Embryo sac is female gometophyte of flowering plants. Pollen sacs are present in anthers which produces pollen grains.
262579
One of the following has been observed for the first time by Treub:
1 entry of the pollen tube into the ovule through the micropyle in Ottetia
2 entry of the pollen tube into the ovule through chalaza in Casuarina
3 entry of the pollen tube into the ovule through the integuments
4 formation of many pollen tubes from a single pollen grain in Hibiscus
Explanation:
Treub was the first who observed the entry of pollen tube into the ovule through chalaza in casuarinas. If the pollen enters through the micropyle, is called porogamy. When it enters through chalaza,is called chalazogamy. And when it enters through the integumentary layers, it is called as mesogamy.
AP EAMCET-2003
Sexual Reproduction in Flowering Plants
262580
The aleurone layer of rice grain is rich in:
1 vitamin \(\mathrm{A}\)
2 vitamin \(\mathrm{B}\)
3 vitamin \(\mathrm{C}\)
4 vitamin \(\mathrm{E}\)
Explanation:
Aleurone layer is a layer of cells outside the endosperm of cereal grains. It is rich in protein and contain about \(20 \%\) of the vitamin \(\mathrm{B}_{1}, 30 \%\) of the vitamin \(\mathrm{B}_{2}\).
AP EAMCET-2004
Sexual Reproduction in Flowering Plants
262581
Pollen grain wings of pinus are out growths of:
1 exine
2 intine
3 exo-intine
4 sporangial wall
Explanation:
Pollen grains wings of pinus are outgrowths of exine. Exine is outermost layer of pollen grains. And pollen grains wings are characteristic feature of pinus. These wings helps plants in the dispersal of the pollen. These wings allow the pollen to travel further on the wind and reach new area and other plants.
Haryana PMT-2002
Sexual Reproduction in Flowering Plants
262582
A microspore mother cell forms :
1 an ovule
2 pollen grains
3 embryosac
4 a pollen sac
Explanation:
A Microspore mother cells forms pollen grains. The process of formation of microspore from a microspore mother cell through a meiosis is called microsporogenesis. An ovule is a small structure present inside the ovary and contain embryo sac. Embryo sac is female gometophyte of flowering plants. Pollen sacs are present in anthers which produces pollen grains.
262579
One of the following has been observed for the first time by Treub:
1 entry of the pollen tube into the ovule through the micropyle in Ottetia
2 entry of the pollen tube into the ovule through chalaza in Casuarina
3 entry of the pollen tube into the ovule through the integuments
4 formation of many pollen tubes from a single pollen grain in Hibiscus
Explanation:
Treub was the first who observed the entry of pollen tube into the ovule through chalaza in casuarinas. If the pollen enters through the micropyle, is called porogamy. When it enters through chalaza,is called chalazogamy. And when it enters through the integumentary layers, it is called as mesogamy.
AP EAMCET-2003
Sexual Reproduction in Flowering Plants
262580
The aleurone layer of rice grain is rich in:
1 vitamin \(\mathrm{A}\)
2 vitamin \(\mathrm{B}\)
3 vitamin \(\mathrm{C}\)
4 vitamin \(\mathrm{E}\)
Explanation:
Aleurone layer is a layer of cells outside the endosperm of cereal grains. It is rich in protein and contain about \(20 \%\) of the vitamin \(\mathrm{B}_{1}, 30 \%\) of the vitamin \(\mathrm{B}_{2}\).
AP EAMCET-2004
Sexual Reproduction in Flowering Plants
262581
Pollen grain wings of pinus are out growths of:
1 exine
2 intine
3 exo-intine
4 sporangial wall
Explanation:
Pollen grains wings of pinus are outgrowths of exine. Exine is outermost layer of pollen grains. And pollen grains wings are characteristic feature of pinus. These wings helps plants in the dispersal of the pollen. These wings allow the pollen to travel further on the wind and reach new area and other plants.
Haryana PMT-2002
Sexual Reproduction in Flowering Plants
262582
A microspore mother cell forms :
1 an ovule
2 pollen grains
3 embryosac
4 a pollen sac
Explanation:
A Microspore mother cells forms pollen grains. The process of formation of microspore from a microspore mother cell through a meiosis is called microsporogenesis. An ovule is a small structure present inside the ovary and contain embryo sac. Embryo sac is female gometophyte of flowering plants. Pollen sacs are present in anthers which produces pollen grains.
