259540
Which of the following gymnosperm has the presence of vessel?
1 Pinus
2 Ephedra
3 Cycas
4 None of these
Explanation:
Ephedra belongs to gnetophyta which are the only gymnosperm, which possesses vessels or xylem vessels. Xylem vessels are the long tube like compositions which assist in the conduction of water. Ephedra is low climbing desert shrubs. The stems are green and photosynthetic leaves are opposite or whorled. The plants are mostly dioecious.
DUMET-2004
Plant kingdom
259542
Which of the following statement is correct regarding Cycas?
1 Single sporophyll bears male and female sex organs
2 Single cone bears male and female sporophylls
3 Male and female sex organs are present on same plant
4 Male cone and megasporophylls occur on separate plants
Explanation:
Cycas belongs to the order cycadales of Gymnosperms, having male cone and megasporophylls on separate plants. Cycas is dioecious i.e., male cone and female cone are borne on separate plants. Each microsporophyll of male cone bears many microsporangia in its adaxial surface. The female cone has loosely arranged megasporophylls which bears ovule in the middle part.
Manipal-2001
Plant kingdom
259543
In Pinus :
1 seed is winged but-pollen grains are not
2 both seed and pollen grains are wingless
3 pollen grains are winged but seed is not
4 both seeds and pollen grains are winged
Explanation:
In pinus both seeds and pollen grains are winged. In pinus, some of the surface tissue of the ovuliferous scale remains attached to the seed, forming a membranous wing. Winged seeds are believed to promote the long-distance dispersal through air. The pollen are designed to enable the grains to travel long distance in the air.
J and K CET-2001
Plant kingdom
259545
Which one of the following is a gymnosperm
1 Mango
2 Walnut
3 Funaria
4 Chilgoza
Explanation:
Chilgoza or pinus gerardiana is a tall tree belonging to division gymnosperm. It is a tall tree with usually deep, wide and open crowns, with long, erect branches. The leaves are needle like, in groups, of three and spread stiffly. The seeds are broads, with a thin shell and a rudimentary wing.
259540
Which of the following gymnosperm has the presence of vessel?
1 Pinus
2 Ephedra
3 Cycas
4 None of these
Explanation:
Ephedra belongs to gnetophyta which are the only gymnosperm, which possesses vessels or xylem vessels. Xylem vessels are the long tube like compositions which assist in the conduction of water. Ephedra is low climbing desert shrubs. The stems are green and photosynthetic leaves are opposite or whorled. The plants are mostly dioecious.
DUMET-2004
Plant kingdom
259542
Which of the following statement is correct regarding Cycas?
1 Single sporophyll bears male and female sex organs
2 Single cone bears male and female sporophylls
3 Male and female sex organs are present on same plant
4 Male cone and megasporophylls occur on separate plants
Explanation:
Cycas belongs to the order cycadales of Gymnosperms, having male cone and megasporophylls on separate plants. Cycas is dioecious i.e., male cone and female cone are borne on separate plants. Each microsporophyll of male cone bears many microsporangia in its adaxial surface. The female cone has loosely arranged megasporophylls which bears ovule in the middle part.
Manipal-2001
Plant kingdom
259543
In Pinus :
1 seed is winged but-pollen grains are not
2 both seed and pollen grains are wingless
3 pollen grains are winged but seed is not
4 both seeds and pollen grains are winged
Explanation:
In pinus both seeds and pollen grains are winged. In pinus, some of the surface tissue of the ovuliferous scale remains attached to the seed, forming a membranous wing. Winged seeds are believed to promote the long-distance dispersal through air. The pollen are designed to enable the grains to travel long distance in the air.
J and K CET-2001
Plant kingdom
259545
Which one of the following is a gymnosperm
1 Mango
2 Walnut
3 Funaria
4 Chilgoza
Explanation:
Chilgoza or pinus gerardiana is a tall tree belonging to division gymnosperm. It is a tall tree with usually deep, wide and open crowns, with long, erect branches. The leaves are needle like, in groups, of three and spread stiffly. The seeds are broads, with a thin shell and a rudimentary wing.
259540
Which of the following gymnosperm has the presence of vessel?
1 Pinus
2 Ephedra
3 Cycas
4 None of these
Explanation:
Ephedra belongs to gnetophyta which are the only gymnosperm, which possesses vessels or xylem vessels. Xylem vessels are the long tube like compositions which assist in the conduction of water. Ephedra is low climbing desert shrubs. The stems are green and photosynthetic leaves are opposite or whorled. The plants are mostly dioecious.
DUMET-2004
Plant kingdom
259542
Which of the following statement is correct regarding Cycas?
1 Single sporophyll bears male and female sex organs
2 Single cone bears male and female sporophylls
3 Male and female sex organs are present on same plant
4 Male cone and megasporophylls occur on separate plants
Explanation:
Cycas belongs to the order cycadales of Gymnosperms, having male cone and megasporophylls on separate plants. Cycas is dioecious i.e., male cone and female cone are borne on separate plants. Each microsporophyll of male cone bears many microsporangia in its adaxial surface. The female cone has loosely arranged megasporophylls which bears ovule in the middle part.
Manipal-2001
Plant kingdom
259543
In Pinus :
1 seed is winged but-pollen grains are not
2 both seed and pollen grains are wingless
3 pollen grains are winged but seed is not
4 both seeds and pollen grains are winged
Explanation:
In pinus both seeds and pollen grains are winged. In pinus, some of the surface tissue of the ovuliferous scale remains attached to the seed, forming a membranous wing. Winged seeds are believed to promote the long-distance dispersal through air. The pollen are designed to enable the grains to travel long distance in the air.
J and K CET-2001
Plant kingdom
259545
Which one of the following is a gymnosperm
1 Mango
2 Walnut
3 Funaria
4 Chilgoza
Explanation:
Chilgoza or pinus gerardiana is a tall tree belonging to division gymnosperm. It is a tall tree with usually deep, wide and open crowns, with long, erect branches. The leaves are needle like, in groups, of three and spread stiffly. The seeds are broads, with a thin shell and a rudimentary wing.
259540
Which of the following gymnosperm has the presence of vessel?
1 Pinus
2 Ephedra
3 Cycas
4 None of these
Explanation:
Ephedra belongs to gnetophyta which are the only gymnosperm, which possesses vessels or xylem vessels. Xylem vessels are the long tube like compositions which assist in the conduction of water. Ephedra is low climbing desert shrubs. The stems are green and photosynthetic leaves are opposite or whorled. The plants are mostly dioecious.
DUMET-2004
Plant kingdom
259542
Which of the following statement is correct regarding Cycas?
1 Single sporophyll bears male and female sex organs
2 Single cone bears male and female sporophylls
3 Male and female sex organs are present on same plant
4 Male cone and megasporophylls occur on separate plants
Explanation:
Cycas belongs to the order cycadales of Gymnosperms, having male cone and megasporophylls on separate plants. Cycas is dioecious i.e., male cone and female cone are borne on separate plants. Each microsporophyll of male cone bears many microsporangia in its adaxial surface. The female cone has loosely arranged megasporophylls which bears ovule in the middle part.
Manipal-2001
Plant kingdom
259543
In Pinus :
1 seed is winged but-pollen grains are not
2 both seed and pollen grains are wingless
3 pollen grains are winged but seed is not
4 both seeds and pollen grains are winged
Explanation:
In pinus both seeds and pollen grains are winged. In pinus, some of the surface tissue of the ovuliferous scale remains attached to the seed, forming a membranous wing. Winged seeds are believed to promote the long-distance dispersal through air. The pollen are designed to enable the grains to travel long distance in the air.
J and K CET-2001
Plant kingdom
259545
Which one of the following is a gymnosperm
1 Mango
2 Walnut
3 Funaria
4 Chilgoza
Explanation:
Chilgoza or pinus gerardiana is a tall tree belonging to division gymnosperm. It is a tall tree with usually deep, wide and open crowns, with long, erect branches. The leaves are needle like, in groups, of three and spread stiffly. The seeds are broads, with a thin shell and a rudimentary wing.
