BIO 101 | Study Mode

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Question 181
A
cryptogams
B
bryophytes
C
sporophytes
D
thallophytes
Explanation
Eichler divided plant kingdom into two sub- kingdoms cryptogamae and phanerogamae. All plants without flowers and seeds are included in the sub-kingdom cryptogamae whereas phanerogamae includes plants which bear flowers and seeds. <br /> Cryptogams are further classified into three divisions. Thallophyta, Bryophyta and Pteridophyta. Spore bearing plants such as mosses and ferns belong to cryptogams because instead of reproducing by flowers and seeds they reproduce by means of spores.

Correct option: A
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Question 182
A
different sizes of motile sex organs
B
same size of motile sex organs
C
morphologically different sex organs
D
physiologically differentiated sex organs
Explanation
physiologically differentiated sex organs

Correct option: D
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Question 183
A
Osmunda and Equisetum
B
Marsilea and Botrychium
C
Adiantum and Cucurbitaceae
D
Dicksonia and Maidenhair fern.
Explanation
Stele is a column containing vascular tissues which is surrounded by pericycle and separated from ground tissue by endodermis. <br /> Siphonostele is medullated protostele or protostele with central non-vascular pith. Leaf gaps are absent. Siphonostele is of two types: <br /> In Ectophloic siphonostele, central pith is surrounded successively by xylem, phloem, pericycle and endodermis. In amphiphloic siphonostele there is central pith and xylem is surrounded on either side by phloem, pericycle and endodermis. It is found in Osmunda and Equisetum.

Correct option: A
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Question 184
A
manufactures food for itself, as well as for the gametophyte
B
is partially parasitic on the gametophyte
C
produces gametes that give rise to the gametophyte
D
arises from a spore produced from the gametophyte
Explanation
Mosses like Funaria are bryophytes. They are non-vascular plants. The main plant body is gametophytic (n) which is independent and foliose. It forms major part of the life cycle. The sporophytic phase starts with zygote which divides to form sporogenous tissue that is differentiated into foot, seta and capsule. The sporophytic phase is short lived. The foot absorbs nutrients and provides support to the sporophyte.

Correct option: B
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Question 185
A
pteridophyta
B
thallophyta
C
tracheophyta
D
bryophyta.
Explanation
Bryophytes are land inhabiting or terrestrial plants. They complete their vegetative phase on land but water is necessary for their reproductive phase i.e. for completion of life cycle. So bryophytes are known as amphibians of plant kingdom. <br /> Thallophytes have a plant body that is not clearly differentiated into root, stem and leaves. They do not have vascular tissues and so are always aquatic. Pteridophytes are most primitive vascular plants. They have developed vascular tissues and so they were the first vascular plants on land. <br /> Tracheophyte includes all vascular plants pteridophytes, gymnosperms and angiosperms.

Correct option: D
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Question 186
A
some bryophytes
B
pteridophytes
C
all bryophytes
D
gymnosperms.
Explanation
The division Bryophyta includes three classes Hepaticopsida, Anthocerotopsida and Bryopsida. The members of Hepaticopsida and Anthocerotopsida have a thallose plant body which is dorsiventrally differentiated and dichotomously branched. On the ventral surface unicellular or multicellular rhizoids are present. The member of Bryopsida has a main plant body that has a leafy gametophore made up of an axis having spirally arranged leaves. <br /> The rhizoids are multicellular and branched e.g. Sphagnum, Funaria, Riccia, and Anthoceros. So only few members of bryophytes have leafy gametophytes. Gymnosperms have well developed plant body having root stem and leaves. They do not have rhizoids.

Correct option: A
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Question 187
A
it serves as a disinfectant
B
it is easily available
C
it is hygroscopic
D
it reduces transpiration
Explanation
The partially decomposed Sphagnum mass accumulates to form compressed mass called peat, which after drying is used as coal. So it is also called peat moss. Sphagnum has the capacity to retain water for long periods and thus it is used to cover plant roots during transportation.

Correct option: C
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Question 188
A
there is high degree of sterility
B
one can conclude that the plant is apomictic
C
self fertilization is prevented
D
there is no change in success rate of fertilization.
Explanation
In prothallus of vascular cryptogams the antherozoids and eggs mature at different times. The spore on germination gives rise to prothallus. The antherozoids are biflagellated or multiflagellated. The egg is produced inside the venter, water is essential for fertilization and it is always cross-fertilization. Self fertilization is prevented.

Correct option: C
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Question 189
A
Zygnema, Saprolegnia and Hydrilla
B
Fucus, Marsilea and Calotropis
C
Riccia, Dryopteris and Cycas
D
Anthoceros, Funaria and Spirogyra.
Explanation
Flagellated male gametes are mostly seen lower groups of plants like algae, bryophytes, pteridophytes. It is also seen in certain gymnosperms like Cycas. The bryophytes like Riccia have the male gametes which are biflagellate.

Correct option: C
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Question 190
A
a cavity in the ovule in which pollen grains are stored after pollination
B
an opening in the megagametophyte through which the pollen tube approaches the egg
C
the microsporangium in which pollen grains develop
D
a cell in the pollen grain in which the sperms are formed.
Explanation
In gymnosperms, pollen chamber represents the microsporangium in which pollen grains develop. The microspore is generally a globular sac like structure having large number of microspores. The microspores are also termed as pollen grains.

Correct option: C

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