259598
Which of the following features is true for Pinus?
1 Haploid endosperm
2 Biciliated sperms
3 Double fertilization
4 Presence of antheridia
Explanation:
In Pinus, endosperm is produced before ferilization and hence it is haploid. The megaspore and pollen grains are structures of male gametophytes and is also haploid. Megaspore represents the first cell of the the female gametophyte produced by reduction division from magaspore mother cell.
JIPMER-1997
Plant kingdom
259599
Which of the following is a characteristic feature of gymnosperms?
1 The gymnosperms are homosporous
2 The male and female gametophytes do not have independent free living existence
3 The sporophyte is dependent on the gametophyte
4 The ovules are enclosed by the ovary
5 The pollen grain is released from the megasporangium
Explanation:
In gymnosperms, the male and female gametophytes do not have an independent free living existence. They remain within the sporangia retained on the sporophytes i.e., female gametophyte with megasporangium and male gametophyte within microsporangium.
Kerala PMT-2015
Plant kingdom
259600
Pick out the wrong statement
1 A and B
2 B and C
3 C only
4 B only
5 A only
Explanation:
The mycorrhiza is a symbiotic association of a fungus with the roots of higher plants. Some plants like Pinus have an obligate association with the mycorrhizae. The fungal filaments form a network around the young root or they penetrate the root cells. The hyphae have a very large surface area that absorb mineral ions and water from the soil from a much larger volume of soil that perphaps a root cannot do. Therefore, Pinus seeds cannot germinate and establish without the presence of mycorrhizae. The fungus provides minerals and water to the roots in turn the roots provide sugars and $\mathrm{N}$-containing compound to the micorrhizae.
Kerala PMT-2015
Plant kingdom
259601
The roots of some higher plants get associated with a fungal partner. The roots provide food to the fungus while the fungus supplies water to the roots. The structure so formed is known as
1 lichen
2 mycorrhiza
3 anabaena
4 rhizobium
Explanation:
A mycorrhiza is a symbiotic association between roots of higher plant and a fungus. The plant makes organic molecules such as sugar by photosynthesis and supplies them to the fungus and the fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil.
KVPY SA-2012
Plant kingdom
259602
In gymnosperms, the pollen chamber represent
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grain are stored after pollination
3 an opening in the megagametophyte through which the pollen tube approaches the egg
4 the microsporangium in which pollen grains develop
Explanation:
In gymnosperms, pollen chambers are the part that is responsible for the storage of pollen grains after pollination. This is because gymnosperms do not produce fruits to cover their seeds. This is cavity at the tip of the ovule lying under the integuments. When the plant matures and these cavities swell open, releasing the pollen grains for pollination to take place. The pollen chambers present in gymnosperms represent a cavity in the ovule in which pollen grain are stored after pollination.
259598
Which of the following features is true for Pinus?
1 Haploid endosperm
2 Biciliated sperms
3 Double fertilization
4 Presence of antheridia
Explanation:
In Pinus, endosperm is produced before ferilization and hence it is haploid. The megaspore and pollen grains are structures of male gametophytes and is also haploid. Megaspore represents the first cell of the the female gametophyte produced by reduction division from magaspore mother cell.
JIPMER-1997
Plant kingdom
259599
Which of the following is a characteristic feature of gymnosperms?
1 The gymnosperms are homosporous
2 The male and female gametophytes do not have independent free living existence
3 The sporophyte is dependent on the gametophyte
4 The ovules are enclosed by the ovary
5 The pollen grain is released from the megasporangium
Explanation:
In gymnosperms, the male and female gametophytes do not have an independent free living existence. They remain within the sporangia retained on the sporophytes i.e., female gametophyte with megasporangium and male gametophyte within microsporangium.
Kerala PMT-2015
Plant kingdom
259600
Pick out the wrong statement
1 A and B
2 B and C
3 C only
4 B only
5 A only
Explanation:
The mycorrhiza is a symbiotic association of a fungus with the roots of higher plants. Some plants like Pinus have an obligate association with the mycorrhizae. The fungal filaments form a network around the young root or they penetrate the root cells. The hyphae have a very large surface area that absorb mineral ions and water from the soil from a much larger volume of soil that perphaps a root cannot do. Therefore, Pinus seeds cannot germinate and establish without the presence of mycorrhizae. The fungus provides minerals and water to the roots in turn the roots provide sugars and $\mathrm{N}$-containing compound to the micorrhizae.
Kerala PMT-2015
Plant kingdom
259601
The roots of some higher plants get associated with a fungal partner. The roots provide food to the fungus while the fungus supplies water to the roots. The structure so formed is known as
1 lichen
2 mycorrhiza
3 anabaena
4 rhizobium
Explanation:
A mycorrhiza is a symbiotic association between roots of higher plant and a fungus. The plant makes organic molecules such as sugar by photosynthesis and supplies them to the fungus and the fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil.
KVPY SA-2012
Plant kingdom
259602
In gymnosperms, the pollen chamber represent
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grain are stored after pollination
3 an opening in the megagametophyte through which the pollen tube approaches the egg
4 the microsporangium in which pollen grains develop
Explanation:
In gymnosperms, pollen chambers are the part that is responsible for the storage of pollen grains after pollination. This is because gymnosperms do not produce fruits to cover their seeds. This is cavity at the tip of the ovule lying under the integuments. When the plant matures and these cavities swell open, releasing the pollen grains for pollination to take place. The pollen chambers present in gymnosperms represent a cavity in the ovule in which pollen grain are stored after pollination.
259598
Which of the following features is true for Pinus?
1 Haploid endosperm
2 Biciliated sperms
3 Double fertilization
4 Presence of antheridia
Explanation:
In Pinus, endosperm is produced before ferilization and hence it is haploid. The megaspore and pollen grains are structures of male gametophytes and is also haploid. Megaspore represents the first cell of the the female gametophyte produced by reduction division from magaspore mother cell.
JIPMER-1997
Plant kingdom
259599
Which of the following is a characteristic feature of gymnosperms?
1 The gymnosperms are homosporous
2 The male and female gametophytes do not have independent free living existence
3 The sporophyte is dependent on the gametophyte
4 The ovules are enclosed by the ovary
5 The pollen grain is released from the megasporangium
Explanation:
In gymnosperms, the male and female gametophytes do not have an independent free living existence. They remain within the sporangia retained on the sporophytes i.e., female gametophyte with megasporangium and male gametophyte within microsporangium.
Kerala PMT-2015
Plant kingdom
259600
Pick out the wrong statement
1 A and B
2 B and C
3 C only
4 B only
5 A only
Explanation:
The mycorrhiza is a symbiotic association of a fungus with the roots of higher plants. Some plants like Pinus have an obligate association with the mycorrhizae. The fungal filaments form a network around the young root or they penetrate the root cells. The hyphae have a very large surface area that absorb mineral ions and water from the soil from a much larger volume of soil that perphaps a root cannot do. Therefore, Pinus seeds cannot germinate and establish without the presence of mycorrhizae. The fungus provides minerals and water to the roots in turn the roots provide sugars and $\mathrm{N}$-containing compound to the micorrhizae.
Kerala PMT-2015
Plant kingdom
259601
The roots of some higher plants get associated with a fungal partner. The roots provide food to the fungus while the fungus supplies water to the roots. The structure so formed is known as
1 lichen
2 mycorrhiza
3 anabaena
4 rhizobium
Explanation:
A mycorrhiza is a symbiotic association between roots of higher plant and a fungus. The plant makes organic molecules such as sugar by photosynthesis and supplies them to the fungus and the fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil.
KVPY SA-2012
Plant kingdom
259602
In gymnosperms, the pollen chamber represent
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grain are stored after pollination
3 an opening in the megagametophyte through which the pollen tube approaches the egg
4 the microsporangium in which pollen grains develop
Explanation:
In gymnosperms, pollen chambers are the part that is responsible for the storage of pollen grains after pollination. This is because gymnosperms do not produce fruits to cover their seeds. This is cavity at the tip of the ovule lying under the integuments. When the plant matures and these cavities swell open, releasing the pollen grains for pollination to take place. The pollen chambers present in gymnosperms represent a cavity in the ovule in which pollen grain are stored after pollination.
259598
Which of the following features is true for Pinus?
1 Haploid endosperm
2 Biciliated sperms
3 Double fertilization
4 Presence of antheridia
Explanation:
In Pinus, endosperm is produced before ferilization and hence it is haploid. The megaspore and pollen grains are structures of male gametophytes and is also haploid. Megaspore represents the first cell of the the female gametophyte produced by reduction division from magaspore mother cell.
JIPMER-1997
Plant kingdom
259599
Which of the following is a characteristic feature of gymnosperms?
1 The gymnosperms are homosporous
2 The male and female gametophytes do not have independent free living existence
3 The sporophyte is dependent on the gametophyte
4 The ovules are enclosed by the ovary
5 The pollen grain is released from the megasporangium
Explanation:
In gymnosperms, the male and female gametophytes do not have an independent free living existence. They remain within the sporangia retained on the sporophytes i.e., female gametophyte with megasporangium and male gametophyte within microsporangium.
Kerala PMT-2015
Plant kingdom
259600
Pick out the wrong statement
1 A and B
2 B and C
3 C only
4 B only
5 A only
Explanation:
The mycorrhiza is a symbiotic association of a fungus with the roots of higher plants. Some plants like Pinus have an obligate association with the mycorrhizae. The fungal filaments form a network around the young root or they penetrate the root cells. The hyphae have a very large surface area that absorb mineral ions and water from the soil from a much larger volume of soil that perphaps a root cannot do. Therefore, Pinus seeds cannot germinate and establish without the presence of mycorrhizae. The fungus provides minerals and water to the roots in turn the roots provide sugars and $\mathrm{N}$-containing compound to the micorrhizae.
Kerala PMT-2015
Plant kingdom
259601
The roots of some higher plants get associated with a fungal partner. The roots provide food to the fungus while the fungus supplies water to the roots. The structure so formed is known as
1 lichen
2 mycorrhiza
3 anabaena
4 rhizobium
Explanation:
A mycorrhiza is a symbiotic association between roots of higher plant and a fungus. The plant makes organic molecules such as sugar by photosynthesis and supplies them to the fungus and the fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil.
KVPY SA-2012
Plant kingdom
259602
In gymnosperms, the pollen chamber represent
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grain are stored after pollination
3 an opening in the megagametophyte through which the pollen tube approaches the egg
4 the microsporangium in which pollen grains develop
Explanation:
In gymnosperms, pollen chambers are the part that is responsible for the storage of pollen grains after pollination. This is because gymnosperms do not produce fruits to cover their seeds. This is cavity at the tip of the ovule lying under the integuments. When the plant matures and these cavities swell open, releasing the pollen grains for pollination to take place. The pollen chambers present in gymnosperms represent a cavity in the ovule in which pollen grain are stored after pollination.
259598
Which of the following features is true for Pinus?
1 Haploid endosperm
2 Biciliated sperms
3 Double fertilization
4 Presence of antheridia
Explanation:
In Pinus, endosperm is produced before ferilization and hence it is haploid. The megaspore and pollen grains are structures of male gametophytes and is also haploid. Megaspore represents the first cell of the the female gametophyte produced by reduction division from magaspore mother cell.
JIPMER-1997
Plant kingdom
259599
Which of the following is a characteristic feature of gymnosperms?
1 The gymnosperms are homosporous
2 The male and female gametophytes do not have independent free living existence
3 The sporophyte is dependent on the gametophyte
4 The ovules are enclosed by the ovary
5 The pollen grain is released from the megasporangium
Explanation:
In gymnosperms, the male and female gametophytes do not have an independent free living existence. They remain within the sporangia retained on the sporophytes i.e., female gametophyte with megasporangium and male gametophyte within microsporangium.
Kerala PMT-2015
Plant kingdom
259600
Pick out the wrong statement
1 A and B
2 B and C
3 C only
4 B only
5 A only
Explanation:
The mycorrhiza is a symbiotic association of a fungus with the roots of higher plants. Some plants like Pinus have an obligate association with the mycorrhizae. The fungal filaments form a network around the young root or they penetrate the root cells. The hyphae have a very large surface area that absorb mineral ions and water from the soil from a much larger volume of soil that perphaps a root cannot do. Therefore, Pinus seeds cannot germinate and establish without the presence of mycorrhizae. The fungus provides minerals and water to the roots in turn the roots provide sugars and $\mathrm{N}$-containing compound to the micorrhizae.
Kerala PMT-2015
Plant kingdom
259601
The roots of some higher plants get associated with a fungal partner. The roots provide food to the fungus while the fungus supplies water to the roots. The structure so formed is known as
1 lichen
2 mycorrhiza
3 anabaena
4 rhizobium
Explanation:
A mycorrhiza is a symbiotic association between roots of higher plant and a fungus. The plant makes organic molecules such as sugar by photosynthesis and supplies them to the fungus and the fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil.
KVPY SA-2012
Plant kingdom
259602
In gymnosperms, the pollen chamber represent
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grain are stored after pollination
3 an opening in the megagametophyte through which the pollen tube approaches the egg
4 the microsporangium in which pollen grains develop
Explanation:
In gymnosperms, pollen chambers are the part that is responsible for the storage of pollen grains after pollination. This is because gymnosperms do not produce fruits to cover their seeds. This is cavity at the tip of the ovule lying under the integuments. When the plant matures and these cavities swell open, releasing the pollen grains for pollination to take place. The pollen chambers present in gymnosperms represent a cavity in the ovule in which pollen grain are stored after pollination.
