BIO 101 | Study Mode

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Question 131
A
apospory
B
apogamy
C
parthenocarpy
D
parthenogenesis.
Explanation
Prothallus (gametophyte) gives rise to fern plant (sporophyte) without fertilization. This phenomenon is called apogamy. Development of sporophyte from gametophyte without forming gamete is apogamy. Such sporophyte is haploid in nature.

Correct option: B
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Question 132
A
triploid
B
haploid
C
diploid
D
tetraploid.
Explanation
In Pmz/.v/Cyca.v/gymnosperms the endosperm is haploid because it is produced before fertilization.

Correct option: B
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Question 133
A
heterosporous nature
B
rhizophore
C
strobili
D
ligule.
Explanation
Evolutionary important character of Selaginella is heterosporous nature. Selaginella produces two types of spores microspores and megaspores. Heterospory in the life cycle of Selaginella leads to the formation of seed habit.

Correct option: A
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Question 134
A
Pteris archegonia repel Funaria sperms
B
Funaria sperms get killed by Pteris sperms
C
Funaria sperms are less mobile
D
Pteris archegonia release chemical to attract its sperms.
Explanation
Sperms of both Funaria and Pteris were released together near the archegonia. But only the sperms of Pteris enter the archegonia, as Pteris archegonia releases a chemical malic acid to attract its sperms for fertilization.

Correct option: D
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Question 135
A
megaspore, endosperm and embryo
B
megaspore, pollen grain and endosperm
C
megaspore, integument and root
D
pollen grain, leaf and root.
Explanation
In Pinus gymnosperms, endosperm is produced before fertilization and hence it is haploid. Megaspore and pollen grains are structures of male gametophytes and it is also haploid.

Correct option: B
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Question 136
A
lower part
B
upper Part
C
middle part
D
fertile part.
Explanation
Apophysis is basal portion of capsule in continuation with seta. The outer layer of apophysis is epidermis which has stomata for gaseous exchange. In capsule of Funaria stomata are present only in apophysis.

Correct option: A
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Question 137
A
spore dispersal
B
photosynthesis
C
protection
D
absorption.
Explanation
Moss peristome is present in capsule and takes part in spore dispersal. The hygroscopic action of peristomial teeth help in the removal of operculum. The lengthening and shortening of peristomial teeth help in the dispersal of spores. The inner peristome acts as a sieve allowing only a few spores to escape at a time.

Correct option: A
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Question 138
A
Riccia
B
Funaria
C
Anthoceros
D
Spirogya.
Explanation
Protonema occurs in the life cycle of Funaria. The spore is the first cell of gametophytic generation and it germinates to form a filamentous branched alga like structure called protonema. If gives rise to new plant.

Correct option: B
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Question 139
A
zygospore
B
zoospore
C
oospore
D
carpospore.
Explanation
The product of conjugation in Spirogyra or fertilization of Chlamydomonas is zygospore. Both are the members of green algae where gametes are fused to form zygote which develops into a thick walled zygospore.

Correct option: A
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Question 140
A
isogamous
B
anisogamous
C
oogamous
D
hologamous.
Explanation
In Chlamysomonas sexual reproduction takes place through isogamy, anisogamy, and oogamy, lsogamy is the fusion of similar gametes. Anisogamy is fusion of morphologically similar but physiologically different cells. Oogamy is fusion of different gametes.

Correct option: A

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