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Question 151 BIO 101 | LAUTECH 100L
A
gamete formation  
B
zoospore formation  
C
zygospore germination  
D
vegetative reproduction.  
Explanation.
Share Answer In UlothrixISpirogyra reduction division (meiosis) occurs at the time of zygospore formation. Plant body of Ulothrix and Spirogyra, is gametophytic (haploid), they produce zoogametes (n) which fuses to form zygosporic (2n) diploid, which is a resting spore. Onset of favourable condition zygospore undergoes reductional division, or meiosis to produce zoo- meiospores.

Correct Option:
C
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Question 152 BIO 101 | LAUTECH 100L
A
stellate  
B
cup-shaped  
C
collar-shaped  
D
spiral.  
Explanation.
Share Answer Chloroplast in Chlamydomonas is cup-shaped. It is one celled structure. Whereas stellate, spiral and collar shaped chloroplasts are present in Zygnema, Spirogyra and Ulothrix respectively.

Correct Option:
B
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Question 153 BIO 101 | LAUTECH 100L
A
vascular tissues  
B
motile antherozoids  
C
archegonia  
D
alternation of generations.  
Explanation.
Share Answer Pteridophytes differs from bryophytes and thallophytes in having well developed vascular tissue system. Vascular tissue plays an important role in conducting water and food materials to the plants. Whereas these are absent in bryophytes and thallophytes.

Correct Option:
A
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Question 154 BIO 101 | LAUTECH 100L
A
Porphyra  
B
enzymes  
C
fat  
D
starch.  
Explanation.
Share Answer Pyrenoids are the centres for formation of starch. There are present in chloroplast and are proteinaceous in nature covered by starch plate. They synthesizes and store starch in them.

Correct Option:
D
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Question 155 BIO 101 | LAUTECH 100L
A
tree habit  
B
green leaves  
C
ovules not enclosed in ovary  
D
wood.  
Explanation.
Share Answer Pinus is a gymnospermic plants which hive a well developed conducting tissue system but seeds are naked. Whereas mango is a angiospermic plants in which seed are enclosed in the ovary and fruit is present.

Correct Option:
C
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Question 156 BIO 101 | LAUTECH 100L
A
Selaginella  
B
Funaria  
C
Chlamydomonas  
D
Pinus.  
Explanation.
Share Answer Pinus is more advanced from the evolutionary point of view. It is a gymnosperms (of phanerogams) having well developed vascular conducting system and bears seeds. While others Selaginella, Funaria and Chlamydomonas do not bear seeds.

Correct Option:
D
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Question 157 BIO 101 | LAUTECH 100L
A
both generations are independent  
B
gametophytes are dependent upon sporophytes  
C
sporophytes complete their life cycle  
D
sporophytes are dependent upon gameto­phytes.  
Explanation.
Share Answer In Bryophytes the main body is gametophytic (n) which is independent and may be thallose (no differentiation in root, stem and leaves). It bears sex organs and after fertilization the sporophytic phase starts. The sporophyte is organically attached to the gametophytic plant and is nutritionally dependent on the gametophyte. It may be wholly or partially dependent on the gametophyte.

Correct Option:
D
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Question 158 BIO 101 | LAUTECH 100L
A
ovuliferous scale  
B
integument  
C
nucellus  
D
bract.  
Explanation.
Share Answer Mature ovule with embryo constitutes seed. The seed is covered with hard seed coat. The outer layer of the seed coat is testa (from middle stony layer). Testa encloses a brown, thin membranous tegmen (from inner fleshy layer). The tegmen surrounds fleshy endosperm. Inside endosperm is present the embryo. At maturity of seed, a thin layer of ovuliferous scale fuses with testa to form a wing (i.e., seeds are winged) which helps in the dispersal of seed.

Correct Option:
A
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Question 159 BIO 101 | LAUTECH 100L
A
isogamy  
B
anisogamy  
C
oogamy  
D
all of these.  
Explanation.
Share Answer The class chlorophyceae is characterised by the members possessing grass-green chromatophores. The other distinguishing features of the class are the presence of starch-as reserve food material, pyrenoids – commonly surrounded by starch sheaths, motile cells bearing anterior flagella of equal length, etc. <br /> In chlorophyceae, three types of sexual reproduction takes place namely isogamy, anisogamy and oogamy. Isogamous type : Here the fusing gametes are morphologically similar but physiologically distinct e.g., Chlamydomonas debaryanum and Ulothrix. Anisogamous type: Fusion takes place between morphologically and physiologically distinct gametes (anisogametes). Chlamydomonas braunii and Pandorina. Oogamous type: Most advanced type in which fusion of small biciliate or multiciliate, active male gamete with large, passive female gamete, Oedogonium, Chlamydomonas coccifera. <br /> nawed

Correct Option:
D
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Question 160 BIO 101 | LAUTECH 100L
A
mitochondrial structure  
B
importance of homopolar bonds in their proteins  
C
cell wall structure  
D
modern cell organization.  
Explanation.
Share Answer Some algae withstand or tolerate a very high temperature and these are often called thermal algae. Such forms are known to grow upto 85CC, nearly boiling water. Their cell wall is hard and protective. A typical cell wall of algae consists of two nonliving layers. <br /> The inner layer is firm consisting of microfibrils and outer layer is gelatinous and amorphous. Various polysaccharides such as cellulose, pectin, mucilage constitute the typical cell wall. The mucilage covering of the cell is thick and dense and is called the sheath. This sheath holds the cells in colonies together, is having water absorbing and water retaining capacity. It thus protects them under dessicating conditions. Thus they are able to survive under high temperature.

Correct Option:
C
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