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Question 171 BIO 101 | LAUTECH 100L
A
possess archegonia  
B
contain chloroplast  
C
are thalloid forms  
D
have no conducting tissue.  
Explanation.
Share Answer Bryophytes and algae are both autotrophic, plant body thallus like and devoid of vascular tissues. Instead of roots, rhizoids are present for attachment and absorption purpose. Both algae and bryophytes have motile sperms and need water for fertilization. <br /> But bryophytes can be separated from algae because archegonium originated for the first time in bryophytes in plant kingdom. It is a flask shaped structure with swollen base called venter and upper elongated neck. The venter contains a venter canal cell and an egg cell. It is surrounded by one celled thick sterile jacket layer. In algae sex organs are non-jacketed and unicellular.

Correct Option:
A
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Question 172 BIO 101 | LAUTECH 100L
A
heterogametes  
B
basidiospores  
C
isogametes  
D
anisogametes.  
Explanation.
Share Answer Ulothrix belongs to class chlorophyceae of division Thallophyta. The plant body consists of an unbranched filament, consisting of numerous cylindrical cells joined end to end. It is heterothallic and sexual reproduction is of isogamous type. Except holdfast each cell of the filament can give rise to 64 to 128 gametes. The gametes are similar in size, shape and other features. So these gametes are called isogametes. <br /> When two gametes of (+) and (-) strain come together they fuse and a quadriflagellate zygospore is formed. Anisogametes are morphologically and physiologically distinct gametes produced in Chlamydomonas braunii and Pandorina. Basidiospores are the haploid spores produced by a basidium in basidiomycete’s fungi.

Correct Option:
C
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Question 173 BIO 101 | LAUTECH 100L
A
Chlorella  
B
Nostoc  
C
Spirogyra  
D
Ulothrix.  
Explanation.
Share Answer Chlorella is a unicellular green alga that contains high percentage of proteins, lipids and most of the known vitamins (carotene, riboflavin, vitamin Bl2, choline etc) and grows more quickly than Porphyra, so scientists are doing research to obtain food from it. The nutritional value is comparable to the mixture of soybeans and spinach.

Correct Option:
A
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Question 174 BIO 101 | LAUTECH 100L
A
petiole  
B
ligule  
C
bract  
D
spathe.  
Explanation.
Share Answer Heterospory means production of two different sizes of spores-megaspore and microspore. All bryophytes are homosporous. Heterospory originated in some pteridophytes like Selaginella. It is commonly called clubmoss or spike moss. Its leaves contain a flap­like outgrowth at the base on the adaxial side called ligule. <br /> The leaves are of two types – megasporophyll bearing megasporangia and microsporophylls bearing microsporangia. The megasporangium contains four large megaspores and the microsporangia contain large number of small microspores. Thus Selaginella is heterosporous. In some species of Selaginella the embryo remains attached to the sporophyte for a long time and it is the habit towards seed habit.

Correct Option:
B
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Question 175 BIO 101 | LAUTECH 100L
A
Pinus  
B
Dryopteris  
C
Cycas  
D
Both (A) and (C).  
Explanation.
Share Answer Transfusion tissue is a specialized tissue present on either side of midrib in between the palisade and spongy tissues of the leaf of Cycas and also in Pinus leaf at the sides of the sclerenchymtous region. It is made of horizontally arranged tracheids. These supply water and minerals to mesophyll tissue upto margins so that the mesophyll cells can carry out photosynthesis. It is of two type’s primary transfusion tissue present next to the midrib bundle and secondary transfusion tissue that runs upto margins of the leaf. In Pinus it consists of tracheids and albuminous cells.

Correct Option:
D
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Question 176 BIO 101 | LAUTECH 100L
A
it propagates vegetatively by its leaf tips  
B
it known how to walk by itself  
C
its spores are able to walk  
D
it is dispersed through the agency of walking animals.  
Explanation.
Share Answer Walking fern is named so because when its leaf tips come in contact with soil, form new plants as adventitious buds develop at leaf tips. This helps in the spread of fern over a large soil surface and thus the name ‘walking fern’.

Correct Option:
A
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Question 177 BIO 101 | LAUTECH 100L
A
water is essential for their vegetative propagation  
B
the sperms can easily reach upto egg in the archegonium  
C
archegonium has to remain filled with water for fertilization  
D
water is essential for fertilization for their homosporous nature.  
Explanation.
Share Answer Bryophytes are called amphibians of plant kingdom because they complete their vegetative phase on land but water is necessary for their reproductive phase. Water helps in maturation and dehiscence of sex organs in bryophytes. It also helps in the transfer of sperms to the archegonia that make water essential for completion of life cycle of bryophytes.

Correct Option:
B
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Question 178 BIO 101 | LAUTECH 100L
A
filamentous alga lacking flagellated reproductive stages  
B
membranous alga producing zoospores  
C
filamentous alga with flagellated reproductive stages  
D
non-motile colonial alga lacking zoospores.  
Explanation.
Share Answer Ulothrix is a green filamentous alga, belonging to class chlorophyceae. The plant body is an unbranched filament consisting of numerous cylindrical cells joined end and end. Under favourable conditions, each cell produces zoospores except holdfast. These zoospores are of two types – Macrozoospores and microzoospores. <br /> The macrozoospores are larger in size and are quadriflagellate and the microzoospores are smaller zoospores which may be biflagellate or quadrifagelleate. Under unfavourable conditions, nonmotile mitospores called aplanospores are produced. Sexual reproduction in Ulothrix is of isogamous type. The isogamete fuse to form a quadriflagellate zygospore which after meiosis forms 16 aplanospores or zoospores.

Correct Option:
C
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Question 179 BIO 101 | LAUTECH 100L
A
Banyan  
B
Cycas  
C
Thuja  
D
Pinus.  
Explanation.
Share Answer The male gametes of Cycas are largest (300 ft) in nature, visible to naked eye and are oval in form, broad (top-shaped) and naked at posterior end and spirally coiled in the anterior half with thousands of small cilia.

Correct Option:
B
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Question 180 BIO 101 | LAUTECH 100L
A
it has circinate vernation  
B
its xylem is mainly composed of xylem vessel  
C
its roots contain some blue-green algae  
D
it does not have a well organized female flower.  
Explanation.
Share Answer Cycas belongs to order cycadales of gymnosperms. Its leaves show circinate vernation i.e. the leaves are coiled in young stage. The coralloid roots in Cycas arise from the lateral branches of the normal roots and contain blue-green algae like Nostoc and Anabaena. A well developed flower like that of angiosperms is absent in Cycas. It has compact cones containing microsporophylls and megasporophylls. The megaspores are loosely arranged on the megasporophyll. The male cone is a compac structure. Vessels in xylem are absent and it contains only tracheids for conduction of water.

Correct Option:
B
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