Cycas circinalis is an evergreen shrub growing upto $3.5 \mathrm{~m}$ at a slow rate. It is a gymnosperm. The pith is rich in carbohydrate and a sago i.e., starch can be made from it. It is also known as queen sago. The seeds of cycas circinalis is poisonous. Resin:- Resin is a natural or synthetic compound consisting of a non-crystalline or viscous liquid substance. Timber:- Timber refers to wood used for building materials. Timber can also be referred as wood at different stages of processing. - An essential oil is a concentrated hydrophobic liquid containing volatile chemical compounds from plants.
DUMET-2003
Plant kingdom
259544
Which of the following characteristics does not occur in Pinus?
1 The number of needles in a spur of Pinus roxburghii is three
2 Each vascular bundle in the long shoot of Pinus consists of xylem facing towards the centre of the shoot
3 Microsporophyll of Pinus bears two microsporangia
4 Pinus is a homosporous gymnosperm
Explanation:
Pinus is a heterosporous gymnosperm and not homosporous. Heterosporous refers to the presence of the types of spores on the same plant. Megaspore and microspore on the other hand homospore generates identical cells. - Vascular bundles in pinus is collateral, endarch and open.
J and K CET-2003
Plant kingdom
259546
Megasporophyll of Cycas is equivalent to
1 stamen
2 sepal
3 petal
4 carpel
Explanation:
Megasporophyll is gynoecium. Megasporophyll has an ovary, stigma, and style. Ovules in gymnosperms are not contained in an ovary; instead, they are exposed on megasporophyll, which resemble large leaves. Carpeles are thought to be phylogenetically derived from ovule- bearing leaves or leaf homologous (megasporophylls), which evolved to form a closed structure containing the ovules.
Rajasthan PMT-2003
Plant kingdom
259549
Conifers differ from grasses in the
1 production of seeds from ovules
2 lack of xylem tracheids
3 absence of pollen tubes
4 formation of endosperm before fertilization
Explanation:
In the development of endosperm before to fertilization, conifers vary from grasses of all the seed plants, conifers are most rudimentary. A seed is made up of 2 parts: an endosperm that feeds the embryo and the embryo itself, which also receives nutrition from the endosperm. In gymnosperms, the endosperm grows from a spore. Pollination may occur when cone is small, but the endosperm continuous to grow to completion before fertilization occurs. When fully grown the endosperm develops archegonia in which single large nuclei acts as egg cell.
Cycas circinalis is an evergreen shrub growing upto $3.5 \mathrm{~m}$ at a slow rate. It is a gymnosperm. The pith is rich in carbohydrate and a sago i.e., starch can be made from it. It is also known as queen sago. The seeds of cycas circinalis is poisonous. Resin:- Resin is a natural or synthetic compound consisting of a non-crystalline or viscous liquid substance. Timber:- Timber refers to wood used for building materials. Timber can also be referred as wood at different stages of processing. - An essential oil is a concentrated hydrophobic liquid containing volatile chemical compounds from plants.
DUMET-2003
Plant kingdom
259544
Which of the following characteristics does not occur in Pinus?
1 The number of needles in a spur of Pinus roxburghii is three
2 Each vascular bundle in the long shoot of Pinus consists of xylem facing towards the centre of the shoot
3 Microsporophyll of Pinus bears two microsporangia
4 Pinus is a homosporous gymnosperm
Explanation:
Pinus is a heterosporous gymnosperm and not homosporous. Heterosporous refers to the presence of the types of spores on the same plant. Megaspore and microspore on the other hand homospore generates identical cells. - Vascular bundles in pinus is collateral, endarch and open.
J and K CET-2003
Plant kingdom
259546
Megasporophyll of Cycas is equivalent to
1 stamen
2 sepal
3 petal
4 carpel
Explanation:
Megasporophyll is gynoecium. Megasporophyll has an ovary, stigma, and style. Ovules in gymnosperms are not contained in an ovary; instead, they are exposed on megasporophyll, which resemble large leaves. Carpeles are thought to be phylogenetically derived from ovule- bearing leaves or leaf homologous (megasporophylls), which evolved to form a closed structure containing the ovules.
Rajasthan PMT-2003
Plant kingdom
259549
Conifers differ from grasses in the
1 production of seeds from ovules
2 lack of xylem tracheids
3 absence of pollen tubes
4 formation of endosperm before fertilization
Explanation:
In the development of endosperm before to fertilization, conifers vary from grasses of all the seed plants, conifers are most rudimentary. A seed is made up of 2 parts: an endosperm that feeds the embryo and the embryo itself, which also receives nutrition from the endosperm. In gymnosperms, the endosperm grows from a spore. Pollination may occur when cone is small, but the endosperm continuous to grow to completion before fertilization occurs. When fully grown the endosperm develops archegonia in which single large nuclei acts as egg cell.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Plant kingdom
259541
Cycas circinalis is a source of:
1 Resin
2 Timber
3 Essential oil
4 Starch
Explanation:
Cycas circinalis is an evergreen shrub growing upto $3.5 \mathrm{~m}$ at a slow rate. It is a gymnosperm. The pith is rich in carbohydrate and a sago i.e., starch can be made from it. It is also known as queen sago. The seeds of cycas circinalis is poisonous. Resin:- Resin is a natural or synthetic compound consisting of a non-crystalline or viscous liquid substance. Timber:- Timber refers to wood used for building materials. Timber can also be referred as wood at different stages of processing. - An essential oil is a concentrated hydrophobic liquid containing volatile chemical compounds from plants.
DUMET-2003
Plant kingdom
259544
Which of the following characteristics does not occur in Pinus?
1 The number of needles in a spur of Pinus roxburghii is three
2 Each vascular bundle in the long shoot of Pinus consists of xylem facing towards the centre of the shoot
3 Microsporophyll of Pinus bears two microsporangia
4 Pinus is a homosporous gymnosperm
Explanation:
Pinus is a heterosporous gymnosperm and not homosporous. Heterosporous refers to the presence of the types of spores on the same plant. Megaspore and microspore on the other hand homospore generates identical cells. - Vascular bundles in pinus is collateral, endarch and open.
J and K CET-2003
Plant kingdom
259546
Megasporophyll of Cycas is equivalent to
1 stamen
2 sepal
3 petal
4 carpel
Explanation:
Megasporophyll is gynoecium. Megasporophyll has an ovary, stigma, and style. Ovules in gymnosperms are not contained in an ovary; instead, they are exposed on megasporophyll, which resemble large leaves. Carpeles are thought to be phylogenetically derived from ovule- bearing leaves or leaf homologous (megasporophylls), which evolved to form a closed structure containing the ovules.
Rajasthan PMT-2003
Plant kingdom
259549
Conifers differ from grasses in the
1 production of seeds from ovules
2 lack of xylem tracheids
3 absence of pollen tubes
4 formation of endosperm before fertilization
Explanation:
In the development of endosperm before to fertilization, conifers vary from grasses of all the seed plants, conifers are most rudimentary. A seed is made up of 2 parts: an endosperm that feeds the embryo and the embryo itself, which also receives nutrition from the endosperm. In gymnosperms, the endosperm grows from a spore. Pollination may occur when cone is small, but the endosperm continuous to grow to completion before fertilization occurs. When fully grown the endosperm develops archegonia in which single large nuclei acts as egg cell.
Cycas circinalis is an evergreen shrub growing upto $3.5 \mathrm{~m}$ at a slow rate. It is a gymnosperm. The pith is rich in carbohydrate and a sago i.e., starch can be made from it. It is also known as queen sago. The seeds of cycas circinalis is poisonous. Resin:- Resin is a natural or synthetic compound consisting of a non-crystalline or viscous liquid substance. Timber:- Timber refers to wood used for building materials. Timber can also be referred as wood at different stages of processing. - An essential oil is a concentrated hydrophobic liquid containing volatile chemical compounds from plants.
DUMET-2003
Plant kingdom
259544
Which of the following characteristics does not occur in Pinus?
1 The number of needles in a spur of Pinus roxburghii is three
2 Each vascular bundle in the long shoot of Pinus consists of xylem facing towards the centre of the shoot
3 Microsporophyll of Pinus bears two microsporangia
4 Pinus is a homosporous gymnosperm
Explanation:
Pinus is a heterosporous gymnosperm and not homosporous. Heterosporous refers to the presence of the types of spores on the same plant. Megaspore and microspore on the other hand homospore generates identical cells. - Vascular bundles in pinus is collateral, endarch and open.
J and K CET-2003
Plant kingdom
259546
Megasporophyll of Cycas is equivalent to
1 stamen
2 sepal
3 petal
4 carpel
Explanation:
Megasporophyll is gynoecium. Megasporophyll has an ovary, stigma, and style. Ovules in gymnosperms are not contained in an ovary; instead, they are exposed on megasporophyll, which resemble large leaves. Carpeles are thought to be phylogenetically derived from ovule- bearing leaves or leaf homologous (megasporophylls), which evolved to form a closed structure containing the ovules.
Rajasthan PMT-2003
Plant kingdom
259549
Conifers differ from grasses in the
1 production of seeds from ovules
2 lack of xylem tracheids
3 absence of pollen tubes
4 formation of endosperm before fertilization
Explanation:
In the development of endosperm before to fertilization, conifers vary from grasses of all the seed plants, conifers are most rudimentary. A seed is made up of 2 parts: an endosperm that feeds the embryo and the embryo itself, which also receives nutrition from the endosperm. In gymnosperms, the endosperm grows from a spore. Pollination may occur when cone is small, but the endosperm continuous to grow to completion before fertilization occurs. When fully grown the endosperm develops archegonia in which single large nuclei acts as egg cell.