259433
Gametophytic and sporophytic phasess are independent in
1 pteridophyte
2 bryophyte
3 gymnosperms
4 phaeophytes
Explanation:
Gametophytic \& sporophytic phases are independent in pteridophyte. They exhibit dominant sporophytic generation with an inconspicuous gametophytic generation. The sporophyte is differentiated into root, stem and leaves.
JCECE-2008
Plant kingdom
259434
In pteridophytes, phloem is without
1 bast fibers
2 sieve tubes
3 companion cells
4 sieve cells
Explanation:
In pteridophytes, phloem is without companion cell. The companion cells are specialized parenchymal cells in the phloem tissue. They are nucleated living cells with several ribosome, plastids and mitochondria. These cell are present only in angiosperms.
JIPMER-2013 / Manipal-2010
Plant kingdom
259438
Antherozoids of pteridophyta are
1 Much coiled and multiciliated
2 Pear-shaped and biflagellate
3 Cork screw-shaped and multiflagellated
4 All of the above
Explanation:
Antherozoids of pteridophyta are All of the above. It is present in the gametophytic phase of cryptogams such as bryophytes and ferns and lower pteridophytes.
BCECE-2011
Plant kingdom
259440
How many meiosis occur in the sporangium of Nephrolepis ?
1 1
2 4
3 16
4 Uncertain and variable
Explanation:
Only one meiosis occur in the sporangium of Nephrolepis. It is a type of fern whose main plant body is sporophytic which is differentiated into true roots, stem and leaves. During sporophytic phase adult plant produces diploid spores mother cells in the sporangium. Their main characteristic feature is the presence of sporophylls. These are leaves bearing sporangia. Several sporophylls condense to form a compact structure known as strobili or cones.
259433
Gametophytic and sporophytic phasess are independent in
1 pteridophyte
2 bryophyte
3 gymnosperms
4 phaeophytes
Explanation:
Gametophytic \& sporophytic phases are independent in pteridophyte. They exhibit dominant sporophytic generation with an inconspicuous gametophytic generation. The sporophyte is differentiated into root, stem and leaves.
JCECE-2008
Plant kingdom
259434
In pteridophytes, phloem is without
1 bast fibers
2 sieve tubes
3 companion cells
4 sieve cells
Explanation:
In pteridophytes, phloem is without companion cell. The companion cells are specialized parenchymal cells in the phloem tissue. They are nucleated living cells with several ribosome, plastids and mitochondria. These cell are present only in angiosperms.
JIPMER-2013 / Manipal-2010
Plant kingdom
259438
Antherozoids of pteridophyta are
1 Much coiled and multiciliated
2 Pear-shaped and biflagellate
3 Cork screw-shaped and multiflagellated
4 All of the above
Explanation:
Antherozoids of pteridophyta are All of the above. It is present in the gametophytic phase of cryptogams such as bryophytes and ferns and lower pteridophytes.
BCECE-2011
Plant kingdom
259440
How many meiosis occur in the sporangium of Nephrolepis ?
1 1
2 4
3 16
4 Uncertain and variable
Explanation:
Only one meiosis occur in the sporangium of Nephrolepis. It is a type of fern whose main plant body is sporophytic which is differentiated into true roots, stem and leaves. During sporophytic phase adult plant produces diploid spores mother cells in the sporangium. Their main characteristic feature is the presence of sporophylls. These are leaves bearing sporangia. Several sporophylls condense to form a compact structure known as strobili or cones.
259433
Gametophytic and sporophytic phasess are independent in
1 pteridophyte
2 bryophyte
3 gymnosperms
4 phaeophytes
Explanation:
Gametophytic \& sporophytic phases are independent in pteridophyte. They exhibit dominant sporophytic generation with an inconspicuous gametophytic generation. The sporophyte is differentiated into root, stem and leaves.
JCECE-2008
Plant kingdom
259434
In pteridophytes, phloem is without
1 bast fibers
2 sieve tubes
3 companion cells
4 sieve cells
Explanation:
In pteridophytes, phloem is without companion cell. The companion cells are specialized parenchymal cells in the phloem tissue. They are nucleated living cells with several ribosome, plastids and mitochondria. These cell are present only in angiosperms.
JIPMER-2013 / Manipal-2010
Plant kingdom
259438
Antherozoids of pteridophyta are
1 Much coiled and multiciliated
2 Pear-shaped and biflagellate
3 Cork screw-shaped and multiflagellated
4 All of the above
Explanation:
Antherozoids of pteridophyta are All of the above. It is present in the gametophytic phase of cryptogams such as bryophytes and ferns and lower pteridophytes.
BCECE-2011
Plant kingdom
259440
How many meiosis occur in the sporangium of Nephrolepis ?
1 1
2 4
3 16
4 Uncertain and variable
Explanation:
Only one meiosis occur in the sporangium of Nephrolepis. It is a type of fern whose main plant body is sporophytic which is differentiated into true roots, stem and leaves. During sporophytic phase adult plant produces diploid spores mother cells in the sporangium. Their main characteristic feature is the presence of sporophylls. These are leaves bearing sporangia. Several sporophylls condense to form a compact structure known as strobili or cones.
259433
Gametophytic and sporophytic phasess are independent in
1 pteridophyte
2 bryophyte
3 gymnosperms
4 phaeophytes
Explanation:
Gametophytic \& sporophytic phases are independent in pteridophyte. They exhibit dominant sporophytic generation with an inconspicuous gametophytic generation. The sporophyte is differentiated into root, stem and leaves.
JCECE-2008
Plant kingdom
259434
In pteridophytes, phloem is without
1 bast fibers
2 sieve tubes
3 companion cells
4 sieve cells
Explanation:
In pteridophytes, phloem is without companion cell. The companion cells are specialized parenchymal cells in the phloem tissue. They are nucleated living cells with several ribosome, plastids and mitochondria. These cell are present only in angiosperms.
JIPMER-2013 / Manipal-2010
Plant kingdom
259438
Antherozoids of pteridophyta are
1 Much coiled and multiciliated
2 Pear-shaped and biflagellate
3 Cork screw-shaped and multiflagellated
4 All of the above
Explanation:
Antherozoids of pteridophyta are All of the above. It is present in the gametophytic phase of cryptogams such as bryophytes and ferns and lower pteridophytes.
BCECE-2011
Plant kingdom
259440
How many meiosis occur in the sporangium of Nephrolepis ?
1 1
2 4
3 16
4 Uncertain and variable
Explanation:
Only one meiosis occur in the sporangium of Nephrolepis. It is a type of fern whose main plant body is sporophytic which is differentiated into true roots, stem and leaves. During sporophytic phase adult plant produces diploid spores mother cells in the sporangium. Their main characteristic feature is the presence of sporophylls. These are leaves bearing sporangia. Several sporophylls condense to form a compact structure known as strobili or cones.
