259575
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms:
1 perianth and two integuments
2 embryo development and apical meristem
3 absensce of resin duct and leaf venation
4 presence of vessel elements and absence of archegonia
Explanation:
Gymnosperms are seed plants that do not produce flowers. Cycas, Pinus and Gnetum all belong to his group of plants, Gnetum with its 30 species belong to a very dissimilar genera of the family Gnetales. The important features distinguishing Gnetum from cycas and pinus and showing affinities with angiosperms are the presence of vessel elements and absence of archegonia.
AIPMT-2008
Plant kingdom
259576
In gymnosperms, the pollen chamber represents:
1 The microsporangium in which pollen grains develop
2 A cell in the pollen grain in which the sperms are formed
3 A cavity in the ovule in which pollen grains are stored after pollination
4 An opening in the megagametophyte through which the pollen tube approaches the egg
Explanation:
The pollen chamber in gymnosperm is a cavity in the ovule in which pollen grains are deposited after pollination. The generative cell nucleus splits into 2 gametic nuclei inside the pollen chamber, and the cell lengthens to form the pollen tube.
AIPMT-2007
Plant kingdom
259577
In Cycas, pollination takes place in
1 3 celled stage
2 4 celled stage
3 2 celled stage
4 1 celled stage
Explanation:
In cycas, pollination takes place in 3 celled stage. The pollination drop is dehydrated and the pollen grains are sucked in to the pollen chamber. The producing cell nucleus separates into two gametic nuclei within the pollen chamber and the tube cell becomes elongated to produce the pollen tube. The gametic nuclei can pass via the female gametophyte's is pollen tube. A zygote is formed when one unites with the female gamete.
JIPMER-2009
Plant kingdom
259578
Which economically important product is obtained from Cycas circinalis?
1 Timber
2 Sago
3 Essential oil
4 Resin
Explanation:
Cycas cricinalis, commonly known as the Queen sago palm or Queen cycad, is a species of cycad native to India, Sir Lanka and several other countries in Southeast Asia. Sago is made from the pitch of cycas circinalis.
259575
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms:
1 perianth and two integuments
2 embryo development and apical meristem
3 absensce of resin duct and leaf venation
4 presence of vessel elements and absence of archegonia
Explanation:
Gymnosperms are seed plants that do not produce flowers. Cycas, Pinus and Gnetum all belong to his group of plants, Gnetum with its 30 species belong to a very dissimilar genera of the family Gnetales. The important features distinguishing Gnetum from cycas and pinus and showing affinities with angiosperms are the presence of vessel elements and absence of archegonia.
AIPMT-2008
Plant kingdom
259576
In gymnosperms, the pollen chamber represents:
1 The microsporangium in which pollen grains develop
2 A cell in the pollen grain in which the sperms are formed
3 A cavity in the ovule in which pollen grains are stored after pollination
4 An opening in the megagametophyte through which the pollen tube approaches the egg
Explanation:
The pollen chamber in gymnosperm is a cavity in the ovule in which pollen grains are deposited after pollination. The generative cell nucleus splits into 2 gametic nuclei inside the pollen chamber, and the cell lengthens to form the pollen tube.
AIPMT-2007
Plant kingdom
259577
In Cycas, pollination takes place in
1 3 celled stage
2 4 celled stage
3 2 celled stage
4 1 celled stage
Explanation:
In cycas, pollination takes place in 3 celled stage. The pollination drop is dehydrated and the pollen grains are sucked in to the pollen chamber. The producing cell nucleus separates into two gametic nuclei within the pollen chamber and the tube cell becomes elongated to produce the pollen tube. The gametic nuclei can pass via the female gametophyte's is pollen tube. A zygote is formed when one unites with the female gamete.
JIPMER-2009
Plant kingdom
259578
Which economically important product is obtained from Cycas circinalis?
1 Timber
2 Sago
3 Essential oil
4 Resin
Explanation:
Cycas cricinalis, commonly known as the Queen sago palm or Queen cycad, is a species of cycad native to India, Sir Lanka and several other countries in Southeast Asia. Sago is made from the pitch of cycas circinalis.
259575
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms:
1 perianth and two integuments
2 embryo development and apical meristem
3 absensce of resin duct and leaf venation
4 presence of vessel elements and absence of archegonia
Explanation:
Gymnosperms are seed plants that do not produce flowers. Cycas, Pinus and Gnetum all belong to his group of plants, Gnetum with its 30 species belong to a very dissimilar genera of the family Gnetales. The important features distinguishing Gnetum from cycas and pinus and showing affinities with angiosperms are the presence of vessel elements and absence of archegonia.
AIPMT-2008
Plant kingdom
259576
In gymnosperms, the pollen chamber represents:
1 The microsporangium in which pollen grains develop
2 A cell in the pollen grain in which the sperms are formed
3 A cavity in the ovule in which pollen grains are stored after pollination
4 An opening in the megagametophyte through which the pollen tube approaches the egg
Explanation:
The pollen chamber in gymnosperm is a cavity in the ovule in which pollen grains are deposited after pollination. The generative cell nucleus splits into 2 gametic nuclei inside the pollen chamber, and the cell lengthens to form the pollen tube.
AIPMT-2007
Plant kingdom
259577
In Cycas, pollination takes place in
1 3 celled stage
2 4 celled stage
3 2 celled stage
4 1 celled stage
Explanation:
In cycas, pollination takes place in 3 celled stage. The pollination drop is dehydrated and the pollen grains are sucked in to the pollen chamber. The producing cell nucleus separates into two gametic nuclei within the pollen chamber and the tube cell becomes elongated to produce the pollen tube. The gametic nuclei can pass via the female gametophyte's is pollen tube. A zygote is formed when one unites with the female gamete.
JIPMER-2009
Plant kingdom
259578
Which economically important product is obtained from Cycas circinalis?
1 Timber
2 Sago
3 Essential oil
4 Resin
Explanation:
Cycas cricinalis, commonly known as the Queen sago palm or Queen cycad, is a species of cycad native to India, Sir Lanka and several other countries in Southeast Asia. Sago is made from the pitch of cycas circinalis.
259575
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms:
1 perianth and two integuments
2 embryo development and apical meristem
3 absensce of resin duct and leaf venation
4 presence of vessel elements and absence of archegonia
Explanation:
Gymnosperms are seed plants that do not produce flowers. Cycas, Pinus and Gnetum all belong to his group of plants, Gnetum with its 30 species belong to a very dissimilar genera of the family Gnetales. The important features distinguishing Gnetum from cycas and pinus and showing affinities with angiosperms are the presence of vessel elements and absence of archegonia.
AIPMT-2008
Plant kingdom
259576
In gymnosperms, the pollen chamber represents:
1 The microsporangium in which pollen grains develop
2 A cell in the pollen grain in which the sperms are formed
3 A cavity in the ovule in which pollen grains are stored after pollination
4 An opening in the megagametophyte through which the pollen tube approaches the egg
Explanation:
The pollen chamber in gymnosperm is a cavity in the ovule in which pollen grains are deposited after pollination. The generative cell nucleus splits into 2 gametic nuclei inside the pollen chamber, and the cell lengthens to form the pollen tube.
AIPMT-2007
Plant kingdom
259577
In Cycas, pollination takes place in
1 3 celled stage
2 4 celled stage
3 2 celled stage
4 1 celled stage
Explanation:
In cycas, pollination takes place in 3 celled stage. The pollination drop is dehydrated and the pollen grains are sucked in to the pollen chamber. The producing cell nucleus separates into two gametic nuclei within the pollen chamber and the tube cell becomes elongated to produce the pollen tube. The gametic nuclei can pass via the female gametophyte's is pollen tube. A zygote is formed when one unites with the female gamete.
JIPMER-2009
Plant kingdom
259578
Which economically important product is obtained from Cycas circinalis?
1 Timber
2 Sago
3 Essential oil
4 Resin
Explanation:
Cycas cricinalis, commonly known as the Queen sago palm or Queen cycad, is a species of cycad native to India, Sir Lanka and several other countries in Southeast Asia. Sago is made from the pitch of cycas circinalis.
