721.
The shape of tern sporangium is
A
Bi-concave
B
Bi-convex
C
Plano-convex
D
Plano-concave
Answer :
Bi-convex
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722.
What causes sulphur colouds in spring season of temperate climate
A
Male gametophytes of pine
B
Male gametes of Pine
C
Volatine resin & turpentine
D
Sulphur bacteria
Answer :
Male gametophytes of pine
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723.
Which one of the following is considered important in the development of seed habit?
A
Heterospory
B
Haplontic life cycle
C
Free -living gametophyte
D
Dependent sporophyte
Answer :
Heterospory
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724.
Ulothrix does not absorb excess of water from surrounding because
A
Pectin in cell wall
B
Cellulose in cell .wall
C
Low o.p. of cytoplasm
D
Low i.p. of cell sap
Answer :
Low i.p. of cell sap
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725.
Algae which have food conducting tubes similar to phloem in vascular plants are
A
Red algae
B
Brown algae
C
Blue green algae
D
Green algae
Answer :
Brown algae
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726.
Conducting tissue in Riccia is made up of
A
Parenchyma
B
Collenchyma
C
Xylem & phloem
D
Thick walled cells
Answer :
Parenchyma
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727.
The main plant body of Pteridophytes is
A
Sporophyte
B
Gametophyte
C
Haploid
D
None of the above
Answer :
Sporophyte
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728.
How does the spores of a fern plant behaves
A
Joins with another spore to form a seedling
B
Germinates in to a prothallus
C
Germinates into a fern plant
D
Act as a resting structure
Answer :
Germinates in to a prothallus
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729.
Pinus is a Gymnosperm because
A
It is a large tree
B
It is pollinated by wind
C
It has exposed naked ovule
D
It produces seeds and it has narrow leaves
Answer :
It has exposed naked ovule
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730.
Moss peat is used as a packing material for sending flowers and live plants to distance places because
A
In reduces transpiration
B
It serves as a disinfectant
C
It is easily available
D
It is hygroscopic
Answer :
It is hygroscopic
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