259553
Pollen tube of Cycas acts (1) as an agent for carrying male gamete to the egg (2) as a haustorium (3) as endosperm (4) as female cone
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
The Pollen tube of cycas acts as a haustorium as it absorbs food materials from the nucleus and also acts as a sperm carrier. A Pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. Pollen tubes were first discovered by Geovanni Battista Amici in the $19^{\text {th }}$ century.
BHU PMT (Mains)-2007
Plant kingdom
259554
Very delayed fertilization occurs in
1 angiosperms
2 cycas and pinus
3 spermatophytes
4 All of these
Explanation:
Cycas \& Pinus are example of gymnosperms, which are group of seed-bearing plants that do not produce flowers. Gymnosperms typically have reproductive structures called cones. In case of cycads, Male cones produce pollen and female cones produce ovules. In gymnosperms, including cycads and Pinus, fertilization is considered to be "very delayed" because there is a significant time gap between the pollination and fertilization process.
BVP-2011
Plant kingdom
259555
In gymnosperms, the pollen chamber represents
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grains 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 gymnospermes, the pollen chamber is cavity in the ovule in which pollen grains are stored after pollination within the pollen chamber. Pollen grain is first cell of gametophyte. Each pollen grain device asymmetrically into 2 cells - smaller prothallial cell and larger anthridial cell. Prothallial cell do not divide further. Anthridial cell divide to form generative cell and tube cell.
JIPMER-2011
Plant kingdom
259556
Sago which we use as food comes from this plant
1 Calamus rotang
2 Metroxylon rumphii
3 Areca catechu
4 Phoenix dactylifera
Explanation:
Sago is mainly extracted from Metroxylon rumphii which is also called sago palm. Sago is a starch extracted from the pith or spongy core tissue of various tropical palm stems. It is a major staple food for the lowland people of New Guinea \& the Maluku island.
Punjab MET-2011
Plant kingdom
259557
Which one is the hardest wood?
1 Shorea robusta
2 Tectona grandis
3 Cedrus deodara
4 Dalbergia sissoo
Explanation:
Shorea robusta also called "Sal" is one of the most important sources of hardwood timber in India, with hard, coarse-grained wood that is light in colour when freshly cut \& becoming dark brown with exposure. Sal trees are found in Burma, Assam, Bengal, Nepal, the Deccan plateau and foothills of Shivalik.
259553
Pollen tube of Cycas acts (1) as an agent for carrying male gamete to the egg (2) as a haustorium (3) as endosperm (4) as female cone
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
The Pollen tube of cycas acts as a haustorium as it absorbs food materials from the nucleus and also acts as a sperm carrier. A Pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. Pollen tubes were first discovered by Geovanni Battista Amici in the $19^{\text {th }}$ century.
BHU PMT (Mains)-2007
Plant kingdom
259554
Very delayed fertilization occurs in
1 angiosperms
2 cycas and pinus
3 spermatophytes
4 All of these
Explanation:
Cycas \& Pinus are example of gymnosperms, which are group of seed-bearing plants that do not produce flowers. Gymnosperms typically have reproductive structures called cones. In case of cycads, Male cones produce pollen and female cones produce ovules. In gymnosperms, including cycads and Pinus, fertilization is considered to be "very delayed" because there is a significant time gap between the pollination and fertilization process.
BVP-2011
Plant kingdom
259555
In gymnosperms, the pollen chamber represents
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grains 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 gymnospermes, the pollen chamber is cavity in the ovule in which pollen grains are stored after pollination within the pollen chamber. Pollen grain is first cell of gametophyte. Each pollen grain device asymmetrically into 2 cells - smaller prothallial cell and larger anthridial cell. Prothallial cell do not divide further. Anthridial cell divide to form generative cell and tube cell.
JIPMER-2011
Plant kingdom
259556
Sago which we use as food comes from this plant
1 Calamus rotang
2 Metroxylon rumphii
3 Areca catechu
4 Phoenix dactylifera
Explanation:
Sago is mainly extracted from Metroxylon rumphii which is also called sago palm. Sago is a starch extracted from the pith or spongy core tissue of various tropical palm stems. It is a major staple food for the lowland people of New Guinea \& the Maluku island.
Punjab MET-2011
Plant kingdom
259557
Which one is the hardest wood?
1 Shorea robusta
2 Tectona grandis
3 Cedrus deodara
4 Dalbergia sissoo
Explanation:
Shorea robusta also called "Sal" is one of the most important sources of hardwood timber in India, with hard, coarse-grained wood that is light in colour when freshly cut \& becoming dark brown with exposure. Sal trees are found in Burma, Assam, Bengal, Nepal, the Deccan plateau and foothills of Shivalik.
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Plant kingdom
259553
Pollen tube of Cycas acts (1) as an agent for carrying male gamete to the egg (2) as a haustorium (3) as endosperm (4) as female cone
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
The Pollen tube of cycas acts as a haustorium as it absorbs food materials from the nucleus and also acts as a sperm carrier. A Pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. Pollen tubes were first discovered by Geovanni Battista Amici in the $19^{\text {th }}$ century.
BHU PMT (Mains)-2007
Plant kingdom
259554
Very delayed fertilization occurs in
1 angiosperms
2 cycas and pinus
3 spermatophytes
4 All of these
Explanation:
Cycas \& Pinus are example of gymnosperms, which are group of seed-bearing plants that do not produce flowers. Gymnosperms typically have reproductive structures called cones. In case of cycads, Male cones produce pollen and female cones produce ovules. In gymnosperms, including cycads and Pinus, fertilization is considered to be "very delayed" because there is a significant time gap between the pollination and fertilization process.
BVP-2011
Plant kingdom
259555
In gymnosperms, the pollen chamber represents
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grains 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 gymnospermes, the pollen chamber is cavity in the ovule in which pollen grains are stored after pollination within the pollen chamber. Pollen grain is first cell of gametophyte. Each pollen grain device asymmetrically into 2 cells - smaller prothallial cell and larger anthridial cell. Prothallial cell do not divide further. Anthridial cell divide to form generative cell and tube cell.
JIPMER-2011
Plant kingdom
259556
Sago which we use as food comes from this plant
1 Calamus rotang
2 Metroxylon rumphii
3 Areca catechu
4 Phoenix dactylifera
Explanation:
Sago is mainly extracted from Metroxylon rumphii which is also called sago palm. Sago is a starch extracted from the pith or spongy core tissue of various tropical palm stems. It is a major staple food for the lowland people of New Guinea \& the Maluku island.
Punjab MET-2011
Plant kingdom
259557
Which one is the hardest wood?
1 Shorea robusta
2 Tectona grandis
3 Cedrus deodara
4 Dalbergia sissoo
Explanation:
Shorea robusta also called "Sal" is one of the most important sources of hardwood timber in India, with hard, coarse-grained wood that is light in colour when freshly cut \& becoming dark brown with exposure. Sal trees are found in Burma, Assam, Bengal, Nepal, the Deccan plateau and foothills of Shivalik.
259553
Pollen tube of Cycas acts (1) as an agent for carrying male gamete to the egg (2) as a haustorium (3) as endosperm (4) as female cone
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
The Pollen tube of cycas acts as a haustorium as it absorbs food materials from the nucleus and also acts as a sperm carrier. A Pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. Pollen tubes were first discovered by Geovanni Battista Amici in the $19^{\text {th }}$ century.
BHU PMT (Mains)-2007
Plant kingdom
259554
Very delayed fertilization occurs in
1 angiosperms
2 cycas and pinus
3 spermatophytes
4 All of these
Explanation:
Cycas \& Pinus are example of gymnosperms, which are group of seed-bearing plants that do not produce flowers. Gymnosperms typically have reproductive structures called cones. In case of cycads, Male cones produce pollen and female cones produce ovules. In gymnosperms, including cycads and Pinus, fertilization is considered to be "very delayed" because there is a significant time gap between the pollination and fertilization process.
BVP-2011
Plant kingdom
259555
In gymnosperms, the pollen chamber represents
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grains 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 gymnospermes, the pollen chamber is cavity in the ovule in which pollen grains are stored after pollination within the pollen chamber. Pollen grain is first cell of gametophyte. Each pollen grain device asymmetrically into 2 cells - smaller prothallial cell and larger anthridial cell. Prothallial cell do not divide further. Anthridial cell divide to form generative cell and tube cell.
JIPMER-2011
Plant kingdom
259556
Sago which we use as food comes from this plant
1 Calamus rotang
2 Metroxylon rumphii
3 Areca catechu
4 Phoenix dactylifera
Explanation:
Sago is mainly extracted from Metroxylon rumphii which is also called sago palm. Sago is a starch extracted from the pith or spongy core tissue of various tropical palm stems. It is a major staple food for the lowland people of New Guinea \& the Maluku island.
Punjab MET-2011
Plant kingdom
259557
Which one is the hardest wood?
1 Shorea robusta
2 Tectona grandis
3 Cedrus deodara
4 Dalbergia sissoo
Explanation:
Shorea robusta also called "Sal" is one of the most important sources of hardwood timber in India, with hard, coarse-grained wood that is light in colour when freshly cut \& becoming dark brown with exposure. Sal trees are found in Burma, Assam, Bengal, Nepal, the Deccan plateau and foothills of Shivalik.
259553
Pollen tube of Cycas acts (1) as an agent for carrying male gamete to the egg (2) as a haustorium (3) as endosperm (4) as female cone
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
The Pollen tube of cycas acts as a haustorium as it absorbs food materials from the nucleus and also acts as a sperm carrier. A Pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. Pollen tubes were first discovered by Geovanni Battista Amici in the $19^{\text {th }}$ century.
BHU PMT (Mains)-2007
Plant kingdom
259554
Very delayed fertilization occurs in
1 angiosperms
2 cycas and pinus
3 spermatophytes
4 All of these
Explanation:
Cycas \& Pinus are example of gymnosperms, which are group of seed-bearing plants that do not produce flowers. Gymnosperms typically have reproductive structures called cones. In case of cycads, Male cones produce pollen and female cones produce ovules. In gymnosperms, including cycads and Pinus, fertilization is considered to be "very delayed" because there is a significant time gap between the pollination and fertilization process.
BVP-2011
Plant kingdom
259555
In gymnosperms, the pollen chamber represents
1 a cell in the pollen grain in which the sperms are formed
2 a cavity in the ovule in which pollen grains 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 gymnospermes, the pollen chamber is cavity in the ovule in which pollen grains are stored after pollination within the pollen chamber. Pollen grain is first cell of gametophyte. Each pollen grain device asymmetrically into 2 cells - smaller prothallial cell and larger anthridial cell. Prothallial cell do not divide further. Anthridial cell divide to form generative cell and tube cell.
JIPMER-2011
Plant kingdom
259556
Sago which we use as food comes from this plant
1 Calamus rotang
2 Metroxylon rumphii
3 Areca catechu
4 Phoenix dactylifera
Explanation:
Sago is mainly extracted from Metroxylon rumphii which is also called sago palm. Sago is a starch extracted from the pith or spongy core tissue of various tropical palm stems. It is a major staple food for the lowland people of New Guinea \& the Maluku island.
Punjab MET-2011
Plant kingdom
259557
Which one is the hardest wood?
1 Shorea robusta
2 Tectona grandis
3 Cedrus deodara
4 Dalbergia sissoo
Explanation:
Shorea robusta also called "Sal" is one of the most important sources of hardwood timber in India, with hard, coarse-grained wood that is light in colour when freshly cut \& becoming dark brown with exposure. Sal trees are found in Burma, Assam, Bengal, Nepal, the Deccan plateau and foothills of Shivalik.