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Question 181 BIO 101 | LAUTECH 100L
A
liverworts  
B
pteridophytes  
C
fern  
D
Funaria.  
Explanation.
Share Answer Dichotomous branching is characteristic feature of liverworts e.g. Riccia, Marchantia, Pellia etc.. It is a primitive form of branching. It is also called forked branching. In liverworts thethallus is flat and dorsiventral and dichotomously branched. The thallus has a notch at the anterior end. At the base of the notch, there is a growing point consisting of a single apical cell. It divides repeatedly to form two branches of the same size.

Correct Option:
A
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Question 182 BIO 101 | LAUTECH 100L
A
they are thalloid  
B
they posses archegonia  
C
they contain chloroplast  
D
all of these.  
Explanation.
Share Answer Bryophytes are green photosynthetic and thalloid structures where the plant body root, stem and leaves. Instead of roots, rhizoids are present for attachment and absorption purpose. <br /> They have motile sperms and so they need water for fertilization. Archegonia evolved for the first time in bryophytes in the 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.

Correct Option:
D
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Question 183 BIO 101 | LAUTECH 100L
A
pteridophytes  
B
gymnosperms  
C
algae  
D
bryophytes.  
Explanation.
Share Answer Algae, bryophyte and pteridophyte are cryptogams, but out of them algae, and bryophytes are lower cryptogams and do not possess vascular tissue (xylem and phloem), whereas in pteridophytes, vascular tissue system is well developed and so these are higher cryptogams or vascular cryptogams. The term cryptogam means that these plants reproduce by means of spores and do not produce seeds. <br /> The vascular tissue of pteridophytes is well developed. They contain both xylem and phloem. In xylem, vessels are absent and in phloem companion cells are absent. So pteridophytes or vascular cryptogams are a group of seedless vascular plants that have successfully invaded the land and reproduce by means of spores. Gymnosperms are naked seed bearing plants called phanerogams.

Correct Option:
A
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Question 184 BIO 101 | LAUTECH 100L
A
dominant phase of gametophyte which produces spores  
B
small sporophyte phase and generally parasitic on gametophyte  
C
sporophyte is of longer duration  
D
dominant phase of sporophyte which is parasitic.  
Explanation.
Share Answer In bryophytes the main plant body is gametophytic which is independent and may be thallose (no differentiation in root, stem and leaves) e.g., Riccia, Marchantia, Anthoceros etc. or foliose (having leafy axis) e.g. Sphagnum, Funaria etc. <br /> The gametophyte bears the sex organs antheridium and archegonium. Sexual reproduction is of oogamous type. It forms zygote that gives rise to the sporophytic phase. It is differentiated into foot, seta and capsule. The capsule produces spores after meiosis that again gives raise to gametophytic phase. The sporophyte is partially or fully dependent upon the gametophyte and is of shorter duration.

Correct Option:
B
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Question 185 BIO 101 | LAUTECH 100L
A
multiciliated  
B
monociliated  
C
aciliated  
D
biciliated.  
Explanation.
Share Answer Androcytes or antherozoid mother cell of Funaria metamorphoses into a single biflagellate spermatozoid (antherozoids). It is a spirally coiled biflagellate (biciliated) structure.

Correct Option:
D
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Question 186 BIO 101 | LAUTECH 100L
A
gymnosperm  
B
angiosperm  
C
bryophyta  
D
pteridophyta.  
Explanation.
Share Answer Gymnosperms are the most primitive seed plants. The plants are generally perennial, woody trees or shrubs. In general, tallest trees are in gymnosperms e.g. Sequoia sempervirens is 366 ft. in height. The male gametes of Cycas are largest (300) in size; they are visible to naked eye and are oval in form and top-shaped. The ovule of Cycas is also largest in the plant kingdom.

Correct Option:
A
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Question 187 BIO 101 | LAUTECH 100L
A
spore formation  
B
spore germination  
C
gamete formation  
D
antheridia and archegonia formation.  
Explanation.
Share Answer A fern plant body is sporophytic (2n) and is differentiated into roots, stems and leaves. On the ventral surface of leaves sporangia are borne in a group called sori. Inside the sporangium are present the spores which are formed by reduction duvsion. <br /> Thus the spores produced are haploid in nature and germinate to produce a prothallus that represents the gametophytic generation. Antheridium and archegonium are borne on this prothallus. Thus meiosis takes place at the stage of spore formation.

Correct Option:
A
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Question 188 BIO 101 | LAUTECH 100L
A
phaeophyta  
B
rhodophyta  
C
chlorophyta  
D
bacillariophyta.  
Explanation.
Share Answer The algal class rhodophyceae contains a red pigment (r-phycocrythrin) and a blue pigment (r-phycocynin) in the chromatphores. <br /> These pigments can utilize those wavelengths of light (blue-green region of spectrum, i.e., 480-520 nm) that are not absorbed by chlorophyll. This enables red algae to grow at greater depths than other plants (upto 300 ft. below water). In addition to these, chl.-a, chl,-d, carotenes and xanthophylls are present. <br /> In phaeophyceae chromatophores are yellowish brown in colour possessing xanthophylls in abundance. Bacillariophyceae are called ‘diatoms’ due to presence of an accessory brown pigment called ‘diatomin’, other pigments are chl.-a, chl.-c (but not chl.-b), carotenes and xanthophylls. <br /> In chlorophyceae colouring pigments are just like higher plants, i.e., Chl.-a, Chl.-b, xanthophylls and carotenes.

Correct Option:
B
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Question 189 BIO 101 | LAUTECH 100L
A
naked ovules  
B
seemSTike monocot  
C
circinate ptyxis  
D
compound leaves.  
Explanation.
Share Answer Cycas belongs to order cycadales of gymnosperms because it has naked seed. It is not enclosed inside a fruit. It does not have double fertilization and so the endosperm formed is haploid in nature and not triploid. So it is not included in angiosperms as they have ovules (or seeds) produced inside fruit. This is the main difference between gymnosperms and angiosperms.

Correct Option:
A
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Question 190 BIO 101 | LAUTECH 100L
A
maize  
B
mint  
C
peepal  
D
Pinus.  
Explanation.
Share Answer Pinus belong to order coniferales of Gymnosperms. The plant is differentiated into root, stem and leaves. Plants are monoecious. Both male and female cones are borne on the same plant. It develops clusters of shortly stalked male cones subterminally on the lower branches and female cones in circle of 2 – 6 on upper long branches. <br /> A male cone has a central axis and a number of spirally arranged microsporophylls. A microsporophyll bears two oblong microsporangia abaxially on the proximal part. The terminal flattened part is bent and sterile. IV microsporangium produces a large number of yellow pollen grains. Each pollen grain has two wings or air sacs for floating in the air. <br /> The central axis of female cone bears paired scales. In each pair the lower scale is bract scale while the upper one is ovuliferous scale (= megasporophyll complex), the terminal sterile part of ovuliferous scale is broad and called apophysis. The proximal adaxial side bears two ovules.

Correct Option:
D
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