611.
In gymnosperms, the pollen chamber represents A
a cavity in the ovule in which pollen grains are stored after pollination
B
an opening in the megagametophyte through which the pollen tube approaches the egg
C
the microsporangium in which pollen grains develop
D
a cell in the pollen grain in which the sperms are formed
Answer :
a cavity in the ovule in which pollen grains are stored after pollination
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612.
Aquatic ancestory of bryophyta is best indicated by A
Some bryophyta still aquatic
B
Flagellated male gametes
C
Aerechyma in stem
D
All of the above
Answer :
Flagellated male gametes
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613.
The two layers of teeth in the peristome of moss are A
Decorative parts functioning like sepals and petals in a flower
B
Parts which help in the discharge of spores only when the capsule matures. After the operculum falls, they dry up and open out
C
Parts which help in the gradual dispersal of spores. The upper teeth are hygroscopic and open out only in dry weather. The lower ones check sudden dispersal
D
Parts which help in the dispersal of spores. They are not hygroscopic and allow the discharge of spores by disintegration of capsule wall
Answer :
Parts which help in the gradual dispersal of spores. The upper teeth are hygroscopic and open out only in dry weather. The lower ones check sudden dispersal
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614.
Ulothrix in habits A
Slow flowing warm water
B
Stagnant cool water
C
Slow flowing cool water
D
Any of the above
Answer :
Slow flowing cool water
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615.
What is the habit of Pinus plant A
Decurrent
B
Excurrent
C
Recurrent
D
Dichotomous
Answer :
Excurrent
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616.
Which one of the following is wrongly matched? A
Nostoc-Water blooms
B
Spirogyra-Motile gametes
C
Sargassum-Chlorophyll $$c$$
D
Basidiomycetes-Puffballs
Answer :
Spirogyra-Motile gametes
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617.
In Ulothrix, filaments produced from zygosproe are A
All (+) type
B
All (-) type
C
Half (+) And Half (-)
D
75% (+) and 25% (-)
Answer :
Half (+) And Half (-)
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618.
Bryophytes differ from thallphytes in having A
Embryo
B
Rhizods
C
Sterile jacket around sex organs
D
All of the above
Answer :
All of the above
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619.
Riccia and other byryophytes differ from algae in A
Discoidal chloroplat and absence of pyrenoids
B
Jacketed gamatengia and absence of pyrenoid
C
Mitotic development of Oopsore into embryo
D
All of the above
Answer :
All of the above
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620.
In pteridophytes the spore germinate to form A
Protonema
B
Prothallus
C
Sporophyte
D
Archegonium
Answer :
Prothallus
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