259522
Conifers are adapted to tolerate extreme environmental conditions because of
1 broad hardy leaves
2 superficial stomata
3 thick cuticle
4 the presence of vessels
Explanation:
Conifers (Gymnosperms) are adapted to tolerate extreme environmental condition because of thick cuticle, sunken stomata and needle like leaves. Thus, these leaves are well adapted to withstand the harsh and cold climate. They have sunken stomata to preserve water loss during physiological drought conditions.
NEET-2016 Phase-II
Plant kingdom
259523
In which of the following gametophyte is not independent free living?
1 Marchantia
2 Pteris
3 Pinus
4 Funaria
Explanation:
The existence of male and female gametophytes is not independent and free-living in gymnosperms (pinus). They remains within the sporangia retained on the sporophytes. The pollen grain is released from the microsporangium. They are carried in air currents and come in contact with the opening of the ovules born on megasporophylls. The pollen tube carrying the male gametes grows towards archegonia in the ovules and discharge their contents near the mouth of the archegonia.
AIPMT-2015
Plant kingdom
259526
In Pinus, the pollen grain has 6 chromosomes then in its endosperm will have
1 12
2 18
3 6
4 24
Explanation:
In pinus, if the pollen grain has 6 chromosome then its endosperm will also have 6 chromosome as endosperm and pollen grains are haploid structure. The gymnosperm pollen grain consist of four cell the tube cell the generative cells and two prothallial cell.
AIPMT-1992
Plant kingdom
259527
Though Cycas has 2 cotyledons, this is not included in dicot because
1 naked ovule
2 they have megaspore
3 appears as palm tree
4 has compound leaves
Explanation:
Though cycas has 2 cotyledons but is not included in dicot because it has naked ovule. As cycas are not covered by ovary, so, they do not bear fruits. It produces largest ovules. The ovules are orthotropous and unitegmic.
259522
Conifers are adapted to tolerate extreme environmental conditions because of
1 broad hardy leaves
2 superficial stomata
3 thick cuticle
4 the presence of vessels
Explanation:
Conifers (Gymnosperms) are adapted to tolerate extreme environmental condition because of thick cuticle, sunken stomata and needle like leaves. Thus, these leaves are well adapted to withstand the harsh and cold climate. They have sunken stomata to preserve water loss during physiological drought conditions.
NEET-2016 Phase-II
Plant kingdom
259523
In which of the following gametophyte is not independent free living?
1 Marchantia
2 Pteris
3 Pinus
4 Funaria
Explanation:
The existence of male and female gametophytes is not independent and free-living in gymnosperms (pinus). They remains within the sporangia retained on the sporophytes. The pollen grain is released from the microsporangium. They are carried in air currents and come in contact with the opening of the ovules born on megasporophylls. The pollen tube carrying the male gametes grows towards archegonia in the ovules and discharge their contents near the mouth of the archegonia.
AIPMT-2015
Plant kingdom
259526
In Pinus, the pollen grain has 6 chromosomes then in its endosperm will have
1 12
2 18
3 6
4 24
Explanation:
In pinus, if the pollen grain has 6 chromosome then its endosperm will also have 6 chromosome as endosperm and pollen grains are haploid structure. The gymnosperm pollen grain consist of four cell the tube cell the generative cells and two prothallial cell.
AIPMT-1992
Plant kingdom
259527
Though Cycas has 2 cotyledons, this is not included in dicot because
1 naked ovule
2 they have megaspore
3 appears as palm tree
4 has compound leaves
Explanation:
Though cycas has 2 cotyledons but is not included in dicot because it has naked ovule. As cycas are not covered by ovary, so, they do not bear fruits. It produces largest ovules. The ovules are orthotropous and unitegmic.
259522
Conifers are adapted to tolerate extreme environmental conditions because of
1 broad hardy leaves
2 superficial stomata
3 thick cuticle
4 the presence of vessels
Explanation:
Conifers (Gymnosperms) are adapted to tolerate extreme environmental condition because of thick cuticle, sunken stomata and needle like leaves. Thus, these leaves are well adapted to withstand the harsh and cold climate. They have sunken stomata to preserve water loss during physiological drought conditions.
NEET-2016 Phase-II
Plant kingdom
259523
In which of the following gametophyte is not independent free living?
1 Marchantia
2 Pteris
3 Pinus
4 Funaria
Explanation:
The existence of male and female gametophytes is not independent and free-living in gymnosperms (pinus). They remains within the sporangia retained on the sporophytes. The pollen grain is released from the microsporangium. They are carried in air currents and come in contact with the opening of the ovules born on megasporophylls. The pollen tube carrying the male gametes grows towards archegonia in the ovules and discharge their contents near the mouth of the archegonia.
AIPMT-2015
Plant kingdom
259526
In Pinus, the pollen grain has 6 chromosomes then in its endosperm will have
1 12
2 18
3 6
4 24
Explanation:
In pinus, if the pollen grain has 6 chromosome then its endosperm will also have 6 chromosome as endosperm and pollen grains are haploid structure. The gymnosperm pollen grain consist of four cell the tube cell the generative cells and two prothallial cell.
AIPMT-1992
Plant kingdom
259527
Though Cycas has 2 cotyledons, this is not included in dicot because
1 naked ovule
2 they have megaspore
3 appears as palm tree
4 has compound leaves
Explanation:
Though cycas has 2 cotyledons but is not included in dicot because it has naked ovule. As cycas are not covered by ovary, so, they do not bear fruits. It produces largest ovules. The ovules are orthotropous and unitegmic.
259522
Conifers are adapted to tolerate extreme environmental conditions because of
1 broad hardy leaves
2 superficial stomata
3 thick cuticle
4 the presence of vessels
Explanation:
Conifers (Gymnosperms) are adapted to tolerate extreme environmental condition because of thick cuticle, sunken stomata and needle like leaves. Thus, these leaves are well adapted to withstand the harsh and cold climate. They have sunken stomata to preserve water loss during physiological drought conditions.
NEET-2016 Phase-II
Plant kingdom
259523
In which of the following gametophyte is not independent free living?
1 Marchantia
2 Pteris
3 Pinus
4 Funaria
Explanation:
The existence of male and female gametophytes is not independent and free-living in gymnosperms (pinus). They remains within the sporangia retained on the sporophytes. The pollen grain is released from the microsporangium. They are carried in air currents and come in contact with the opening of the ovules born on megasporophylls. The pollen tube carrying the male gametes grows towards archegonia in the ovules and discharge their contents near the mouth of the archegonia.
AIPMT-2015
Plant kingdom
259526
In Pinus, the pollen grain has 6 chromosomes then in its endosperm will have
1 12
2 18
3 6
4 24
Explanation:
In pinus, if the pollen grain has 6 chromosome then its endosperm will also have 6 chromosome as endosperm and pollen grains are haploid structure. The gymnosperm pollen grain consist of four cell the tube cell the generative cells and two prothallial cell.
AIPMT-1992
Plant kingdom
259527
Though Cycas has 2 cotyledons, this is not included in dicot because
1 naked ovule
2 they have megaspore
3 appears as palm tree
4 has compound leaves
Explanation:
Though cycas has 2 cotyledons but is not included in dicot because it has naked ovule. As cycas are not covered by ovary, so, they do not bear fruits. It produces largest ovules. The ovules are orthotropous and unitegmic.
