Mix Examples- Plant Kingdom Questions in English

(B) The correct matching is as follows:
$1$. $Chlamydomonas$ is a unicellular green alga,so $(a) - (iii)$.
$2$. $Cycas$ is a gymnosperm,so $(b) - (iv)$.
$3$. $Selaginella$ is a pteridophyte,so $(c) - (ii)$.
$4$. $Sphagnum$ is a moss (bryophyte),so $(d) - (i)$.
Therefore,the correct sequence is $(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)$.

(B) The correct matches are as follows:
$1$. $A$. Pteridophyte: $IV$. Salvinia is a well-known aquatic pteridophyte.
$2$. $B$. Bryophyte: $III$. Polytrichum is a genus of moss,which belongs to the bryophytes.
$3$. $C$. Angiosperm: $I$. Salvia is a flowering plant,which belongs to the angiosperms.
$4$. $D$. Gymnosperm: $II$. Ginkgo is a living fossil gymnosperm.
Therefore,the correct matching is $A-IV, B-III, C-I, D-II$.

(D) $(i)$ Selaginella and Salvinia are indeed heterosporous pteridophytes,as they produce two types of spores (microspores and megaspores). This statement is correct.
$(ii)$ The gametophyte of pteridophytes is a small,free-living,mostly photosynthetic thalloid structure called a prothallus. This statement is correct.
$(iii)$ In Cycas,the stem is typically unbranched,whereas in Pinus and Cedrus,the stems are branched. This statement is correct.
$(iv)$ All gymnosperms are heterosporous; they produce haploid microspores and megaspores. This statement is correct.
Since all four statements are correct,the total number of correct statements is $4$.

(B) In both $Pteridophytes$ and $Gymnosperms$,the plant body is a $Sporophyte$ $(2n)$,which is the dominant phase of the life cycle.
In $Pteridophytes$,the $Gametophyte$ (prothallus) is small,multicellular,and usually independent (free-living).
However,in $Gymnosperms$,the $Gametophyte$ is highly reduced and dependent on the $Sporophyte$ for nutrition and protection.
Therefore,the assertion is true because the $Sporophyte$ is indeed the dominant phase in both groups.
The reason is also true because $Pteridophyte$ gametophytes are indeed independent.
However,the independence of the gametophyte in $Pteridophytes$ does not explain why the $Sporophyte$ is dominant in $Gymnosperms$.
Thus,both are true,but the reason is not the correct explanation for the assertion.

(C) The plants that possess vascular tissue (xylem and phloem) in their sporophyte generation are Pteridophytes,Gymnosperms,and Angiosperms.
$1$. Cycas: Gymnosperm (Vascular)
$2$. Equisetum: Pteridophyte (Vascular)
$3$. Adiantum: Pteridophyte (Vascular)
$4$. Pinus: Gymnosperm (Vascular)
$5$. Ginkgo: Gymnosperm (Vascular)
$6$. Selaginella: Pteridophyte (Vascular)
$7$. Salvinia: Pteridophyte (Vascular)
The remaining examples (Polytrichum,Funaria,Sphagnum,Marchantia) are Bryophytes,which lack vascular tissue. Polysiphonia is an Alga,which also lacks vascular tissue.
Therefore,there are $7$ examples with vascular tissue.

(C) The correct answer is $C$.
$1$. Rhodophyta (Red algae) contain chlorophyll-$a, d$ and store food as Floridean starch. This is correct.
$2$. Chlorophyta (Green algae) contain chlorophyll-$a, b$ and store food as Starch. This is correct.
$3$. Phaeophyta (Brown algae) contain chlorophyll-$a, c$ and Fucoxanthin. They store food as Laminarin or Mannitol. Carrageen is a phycocolloid found in Red algae (Rhodophyta),not Brown algae. Thus,this is the mismatch.
$4$. Chrysophytes (Diatoms and Golden algae) contain chlorophyll-$a, c$ and have cell walls embedded with silica. This is correct.

(C) The correct matches are as follows:
$1$. Chlorophyceae: $Chara$ is a green alga belonging to the class Chlorophyceae.
$2$. Rhodophyceae: $Polysiphonia$ is a red alga belonging to the class Rhodophyceae.
$3$. Liverworts: $Marchantia$ is a well-known example of a liverwort (Bryophyte).
$4$. Mosses: $Polytrichum$ is a common example of a moss (Bryophyte).
Therefore,the correct matching is $A-(iv), B-(iii), C-(ii), D-(i)$.

(D) Bryophytes and pteridophytes share several characteristics,such as the presence of motile antherozoids,the presence of archegonia,and the requirement of water for fertilization.
However,they differ significantly in their internal structure.
Bryophytes are non-vascular plants,meaning they lack specialized vascular tissues ($xylem$ and $phloem$).
In contrast,pteridophytes are the first terrestrial plants to possess true vascular tissues ($xylem$ and $phloem$).
Therefore,the lack of vascular tissue is a key feature that distinguishes bryophytes from pteridophytes.

(C) Pinus is a gymnosperm that shows a symbiotic association with fungi known as Mycorrhiza $(iii)$.
$(B)$ Cycas is a gymnosperm that possesses specialized roots called Coralloid roots $(iv)$ which contain nitrogen-fixing cyanobacteria.
$(C)$ Polytrichum is a moss (bryophyte) that develops a filamentous stage in its life cycle called Protonema $(i)$.
$(D)$ Dryopteris is a pteridophyte that produces a heart-shaped,free-living gametophyte known as Prothallus $(ii)$.
Therefore,the correct matching is $(A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)$.

(B) To determine which plants have dependent gametophytes,we analyze their life cycles:
$1$. $(i)$ Marchantia (Liverwort) and $(ii)$ Sphagnum,$(iv)$ Polytrichum (Mosses): These are Bryophytes. Their gametophyte is the dominant,independent,free-living phase.
$2$. $(iii)$ Pteris: This is a Pteridophyte. Its gametophyte (prothallus) is small,multicellular,and free-living.
$3$. $(v)$ Pinus,$(vi)$ Cycas (Gymnosperms),and $(vii)$ Castor (Angiosperm): In these seed-bearing plants,the gametophytes are highly reduced and are completely dependent on the sporophyte for nutrition and protection. They do not have an independent free-living existence.
Therefore,the plants where both male and female gametophytes are not independent are $(v)$ Pinus,$(vi)$ Cycas,and $(vii)$ Castor.
The total count is $3$.

(D) Oogamy is a form of sexual reproduction where a large,non-motile female gamete (egg) is fertilized by a smaller,motile or non-motile male gamete.
In the class $Rhodophyceae$ (Red algae),such as $Polysiphonia$ and $Gelidium$,sexual reproduction is oogamous,and both the male and female gametes are non-motile.
$Fucus$ (a brown alga) also exhibits oogamy,but its male gametes are motile (flagellated).
Therefore,$Polysiphonia$ and $Gelidium$ both exhibit oogamy with non-motile gametes.

(D) Based on the provided figures:
$A$ represents $Agaricus$,a type of mushroom (Basidiomycetes).
$B$ represents $Volvox$,a colonial green alga.
$C$ represents $Funaria$,a moss (Bryophyte) showing both gametophyte and sporophyte stages.
$D$ represents $Selaginella$,a pteridophyte.
Therefore,the correct option is $D$.

(D) In $Nostoc$ (a cyanobacterium),reproduction occurs through non-motile spores like akinetes,hormogonia,or heterocysts,and gametes are not formed in the traditional sense as it is a prokaryote. However,in the context of algae and related organisms,$Polysiphonia$ (a red alga) is characterized by the complete absence of flagellated or motile stages in its life cycle,meaning its gametes are non-motile. $Fucus$ (a brown alga) produces motile male gametes (sperms). Therefore,both $Nostoc$ and $Polysiphonia$ represent organisms where motile gametes are absent. Thus,the correct option is $(1) \& (3)$.

(D) $Porphyra$ is a red alga,$Agaricus$ is a fungus (mushroom),$Chlorella$ is a unicellular green alga,and $Spirulina$ is a cyanobacterium.
While they differ in their biological classification,cellular organization,and mode of nutrition,they all share the common characteristic of being used as food or food supplements by humans due to their high protein or nutrient content.
$Chlorella$ and $Spirulina$ are unicellular algae used as protein-rich food supplements.
$Porphyra$ is an edible seaweed.
$Agaricus$ is a widely consumed edible mushroom.

(D) $1$. Agar-Agar is a commercial product obtained from red algae like Gelidium and Gracilaria. This statement is correct.
$2$. Chlorella and Spirulina are unicellular algae rich in proteins and are used as food supplements by space travelers. This statement is correct.
$3$. In Phaeophyceae (brown algae),the stored food material is in the form of complex carbohydrates,usually in the form of laminarin or mannitol. This statement is correct.
$4$. Algin (from brown algae) and Carrageen (from red algae) are phycocolloids obtained from algae,not fungi. Therefore,the statement that they are products of fungi is incorrect.

(A) To determine the classification of the given organisms:
$1$. Red Algae (Rhodophyceae): Gelidium,Gracilaria,Polysiphonia. (Total = $3$)
$2$. Brown Algae (Phaeophyceae): Fucus,Laminaria,Sargassum,Dictyota,Ectocarpus. (Total = $5$)
$3$. Green Algae (Chlorophyceae): Chara,Chlorella. (Total = $2$)
Note: Spirulina is a Cyanobacteria (Blue-green algae) and Sphagnum is a Bryophyte (Moss),so they are excluded from the algae categories mentioned.
Thus,the count is $3$ Red,$5$ Brown,and $2$ Green algae. The correct option is $A$.

(C) The correct matching is as follows:
$1$. Bryophyta: $r$. Sphagnum (a moss).
$2$. Gymnosperm: $p$. Pinus (a conifer).
$3$. Algae: $s$. Ectocarpus (a brown alga).
$4$. Pteridophyta: $q$. Adiantum (a fern).
Therefore,the correct sequence is $1-r, 2-p, 3-s, 4-q$.

(B) The correct answer is $B$.
In $Bryophytes$,the gametophyte is the dominant phase and is independent.
In $Pteridophytes$,the gametophyte (prothallus) is small,multicellular,and usually independent and free-living.
In $Gymnosperms$ and $Angiosperms$,the gametophytes are reduced and dependent on the sporophyte for nutrition and protection.

(D) The correct matches are as follows:
$1$. $(A)$ Prothallus: It is the free-living,photosynthetic,thalloid gametophyte stage found in Pteridophytes $(q)$.
$2$. $(B)$ Microsporophyll: These are leaf-like structures that bear microsporangia,characteristic of Gymnosperms $(s)$.
$3$. $(C)$ Protonema: It is the creeping,green,branched,and filamentous stage in the life cycle of mosses,which are Bryophytes $(p)$.
$4$. $(D)$ $PEN$ (Primary Endosperm Nucleus): It is formed by triple fusion during double fertilization,which is a unique feature of Angiosperms $(r)$.
Therefore,the correct matching is $A-q, B-s, C-p, D-r$.

(A) The correct matching is as follows:
$1$. $A$. Glycogen: It is the stored food material in fungi,such as $Agaricus$ $(t)$.
$2$. $B$. Pyrenoids: These are proteinaceous storage bodies found in the chloroplasts of green algae,such as $Spirogyra$ $(s)$.
$3$. $C$. Laminarin and mannitol: These are the characteristic stored food products of brown algae,such as $Sargassum$ $(p)$.
$4$. $D$. Floridean starch: This is the stored food material in red algae,which is very similar to amylopectin and glycogen in structure,such as $Polysiphonia$ $(r)$.
Therefore,the correct sequence is $A-t, B-s, C-p, D-r$.

(D) Amphibians of plant kingdom.
Mosses (Bryophytes) and ferns (Pteridophytes) are referred to as the "amphibians of the plant kingdom".
This is because they require water for the process of fertilization, as their male gametes are motile and need a water medium to reach the female gametes.
This dependency on water for reproduction is analogous to the life cycle of amphibians in the animal kingdom.