Plantae Questions in English

(A) The division $Thallophyta$ consists of the simplest plants. These organisms do not have a well-differentiated body structure,meaning their body is not differentiated into roots,stems,and leaves. They are predominantly aquatic and are commonly referred to as algae.

(N/A)

Pteridophyta	Phanerogams
They have inconspicuous or less differentiated reproductive organs.	They have well-developed reproductive organs.
They produce naked embryos called spores.	They produce seeds.
Examples include ferns,Marsilea,and Equisetum.	Examples include Pinus,Cycas,and fir.

(N/A)

Gymnosperm	Angiosperm
They are non-flowering plants.	They are flowering plants.
Naked seeds not enclosed inside fruits are produced.	Seeds are enclosed inside fruits.
$Pinus$,$Cedar$,$fir$,$Cycas$,etc.,are examples.	$Coconut$,$palm$,$mango$,etc.,are examples.

(N/A) The major divisions in Kingdom Plantae are:
$1$. Thallophyta
$2$. Bryophyta
$3$. Pteridophyta
$4$. Gymnosperms
$5$. Angiosperms
The basis for these divisions includes the following criteria:
- Whether the plant body is well-differentiated into distinct components like roots,stems,and leaves.
- Whether the plant body possesses specialized vascular tissues ($xylem$ and $phloem$) for the transport of water and nutrients.
- The ability of the plant to produce seeds.
- Whether the seeds are enclosed within fruits (ovary) or are naked.

(B) Specialised conductive tissues (xylem and phloem) are absent in Thallophyta and Bryophyta.
These tissues first appear in Pteridophyta and are also present in Gymnosperms.
Therefore,Pteridophyta and Gymnosperms possess specialised tissues for the conduction of water.

(C) Plants are classified based on their ability to produce seeds.
$1$. Thallophyta,Bryophyta,and Pteridophyta are cryptogams,meaning they do not produce seeds.
$2$. Gymnosperms and Angiosperms are phanerogams,which are seed-bearing plants.
$3$. Therefore,among the given options,Gymnosperms are the only group that produces seeds.

(D) Pteridophytes are vascular cryptogams,meaning they possess roots,stems,and leaves but do not produce seeds or flowers. Flowers are reproductive structures found exclusively in angiosperms (flowering plants).

(N/A) The classification of the given seeds is as follows:
$1$. Gram: Dicot (contains two cotyledons).
$2$. Wheat: Monocot (contains one cotyledon).
$3$. Rice: Monocot (contains one cotyledon).
$4$. Pumpkin: Dicot (contains two cotyledons).
$5$. Maize: Monocot (contains one cotyledon).
$6$. Pea: Dicot (contains two cotyledons).

(B) In the process of primary succession on barren rocks,$Lichens$ are the pioneer species.
$Lichens$ secrete organic acids that help in the weathering of rocks,which leads to the formation of a thin layer of soil.
This soil provides a suitable environment for the growth of bryophytes,specifically $Mosses$.
$Mosses$ further contribute to soil formation and moisture retention,which eventually allows for the colonization of higher plants like ferns and other vegetation.

(A) $F$: Gymnosperms have naked seeds,whereas Angiosperms have covered seeds.
$(b)$ $T$: Cryptogamae are plants that do not produce flowers or seeds.
$(c)$ $F$: Bryophytes lack specialized conducting tissues like xylem and phloem.
$(d)$ $T$: Funaria is a common genus of mosses.
$(e)$ $T$: Many ferns possess fronds which are compound leaves.
$(f)$ $T$: $A$ seed is a reproductive structure that contains an embryo,food supply,and a protective coat.

(N/A) Thallophyta
$(b)$ Without specialized vascular tissue
$(c)$ Pteridophyta
$(d)$ Phanerogams
$(e)$ Bear naked seeds
$(f)$ Angiosperms
$(g)$ Have seeds with two cotyledons
$(h)$ Monocots

(N/A) Examples of thallophytes include: Ulothrix,Spirogyra,Cladophora,Ulva,and Chara.
The labelled diagram of Spirogyra shows the following structures:
$1$. Cell wall: The outer protective layer.
$2$. Chloroplast: The ribbon-shaped,spiral structure involved in photosynthesis.
$3$. Pyrenoids: Small bodies found within the chloroplast that store starch.
$4$. Nucleus: The central control unit of the cell.
$5$. Cytoplasm: The jelly-like substance filling the cell.

(N/A) Thallophyta,Bryophyta,and Pteridophyta are classified as 'Cryptogams' because their reproductive organs are inconspicuous or hidden,and they do not produce seeds.
On the other hand,'Phanerogams' include Gymnosperms and Angiosperms. These plants possess well-differentiated reproductive tissues and produce seeds. In these plants,the embryo develops into a seed,which contains stored food for future growth.
An example of a Gymnosperm is $Pinus$ (Pine),which is a coniferous tree that produces seeds in cones.

(B) In plants,the cell wall is primarily composed of cellulose,which provides structural support and rigidity to the plant cells.
In fungi,the cell wall is composed of chitin,a complex polysaccharide that is also found in the exoskeletons of arthropods.

(B) Gymnosperms are known as 'naked-seeded' plants because their seeds are not enclosed within an ovary or fruit.
Instead,the seeds of gymnosperms typically develop on the surface of specialized reproductive structures known as scales or leaves,often organized into cones (strobili).

(B) Bryophytes are referred to as the amphibians of the plant kingdom because,although they are terrestrial plants that live in damp and shaded areas,they require water for the process of fertilization. The male gametes (antherozoids) must swim through a film of water to reach the female gamete (egg) in the archegonium,making water essential for their life cycle.

(N/A) Gymnosperms are a group of plants that bear naked seeds,meaning the seeds are not enclosed within a fruit.
Characteristic features:
$(i)$ They are usually perennial plants.
$(ii)$ They are typically evergreen and woody plants.

(B) The classification is based on the nature of reproductive organs:
$1$. Thallophytes,Bryophytes,and Pteridophytes are classified as Cryptogamae (from Greek 'kryptos' meaning hidden and 'gamos' meaning marriage) because they have inconspicuous or hidden reproductive organs and do not produce seeds.
$2$. Gymnosperms and Angiosperms are classified as Phanerogamae (from Greek 'phaneros' meaning visible) because they have well-differentiated,visible reproductive organs and produce seeds.

(N/A) The given figure shows a plant with reticulate venation in its leaves,which is a characteristic feature of a dicot plant.

Feature	Dicot Plant	Monocot Plant
Venation in leaf	Reticulate venation	Parallel venation
Number of cotyledons	Two cotyledons	One cotyledon

(N/A)

$CRYPTOGAMAE$	$PHANEROGAMAE$
$(i)$ The reproductive organs are inconspicuous or hidden.	$(i)$ The reproductive organs are well-differentiated and visible.
$(ii)$ They do not produce seeds.	$(ii)$ They produce seeds.
$(iii)$ They reproduce through spores.	$(iii)$ They reproduce through seeds containing embryos.

(N/A)

$BRYOPHYTA$	$PTERIDOPHYTA$
$(i)$ The plant body is not differentiated into true root,stem,and leaves.	$(i)$ The plant body is differentiated into true root,stem,and leaves.
$(ii)$ The main plant body is gametophytic.	$(ii)$ The main plant body is sporophytic.
$(iii)$ They lack a true vascular system. Examples: $Riccia$,$Funaria$ (moss),etc.	$(iii)$ They are terrestrial vascular plants. Examples: $Dryopteris$ (fern),$Lycopodium$,etc.

(N/A) The plant groups collectively known as 'cryptogamae' are Thallophyta,Bryophyta,and Pteridophyta.
$1$. Thallophyta: These plants have a simple,undifferentiated body structure (thallus) and lack specialized vascular tissues (xylem and phloem).
$2$. Bryophyta: These are known as amphibians of the plant kingdom; they possess a thalloid or leafy body and require water for fertilization.
$3$. Pteridophyta: These are the first terrestrial plants to possess vascular tissues (xylem and phloem) and have a well-differentiated plant body into roots,stems,and leaves.

(C) The process of ecological succession on barren rocks (lithosere) begins with the colonization of pioneer species,which are Lichens.
Lichens secrete acids that help in the weathering of rocks,leading to the formation of a thin layer of soil.
Once a thin layer of soil is formed,the environment becomes suitable for the growth of bryophytes,specifically Mosses.
Mosses further contribute to soil formation and moisture retention,eventually paving the way for larger plants like ferns and higher vegetation.

(N/A) $(i)$ Bryophytes: These are known as the amphibians of the plant kingdom because they require water for fertilization despite living on land.
$(ii)$ Thallophytes: These are plants whose body is not differentiated into roots,stems,and leaves,forming a thallus-like structure.
$(iii)$ Protists (specifically algae like Chlamydomonas): These are unicellular,eukaryotic organisms that possess chloroplasts and perform photosynthesis.

(N/A) The basic criteria for classifying the Plantae kingdom are:
$(i)$ Differentiation of the plant body: Whether the plant body is well-differentiated into roots,stems,and leaves.
$(ii)$ Presence of vascular tissues: Whether the plant has specialized tissues (xylem and phloem) for the conduction of water and other substances.
$(iii)$ Ability to bear seeds: Whether the plant produces seeds and if those seeds are naked or enclosed within fruits.
The specimen shown in the image is $Funaria$ (a moss).
Its characteristic features are:
$(i)$ It belongs to the division Bryophyta.
$(ii)$ The plant body is differentiated into stem-like and leaf-like structures,but lacks true roots,stems,and leaves.
$(iii)$ It lacks specialized vascular tissues for the conduction of water and nutrients.
$(iv)$ It reproduces through spores and requires water for fertilization.

(N/A) Bryophytes are called amphibians of the plant kingdom because they live on land but require water for fertilization,as their male gametes are motile and need a water medium to reach the female gametes.
$(b)$ Gymnosperms are called so because the term 'Gymnosperm' is derived from Greek words 'gymnos' meaning naked and 'sperma' meaning seed. They produce seeds that are not enclosed within an ovary or fruit.
$(c)$ Birds have wings and feathers to facilitate flight. Wings provide the necessary surface area for lift,while feathers help in streamlining the body,maintaining body temperature,and providing the aerodynamic structure required for flying.

(N/A) $(i)$ Algae belong to the division Thallophyta.
Characteristic: The plant body is not differentiated into roots,stems,and leaves (thallus-like body).
Examples: $Spirogyra$,$Chara$ (or $Ulothrix$,$Cladophora$).
$(ii)$ $(a)$ Protista,$(b)$ Fungi,$(c)$ Gymnosperms.
$(iii)$ Flowering plants (Angiosperms) are classified based on the number of cotyledons as:
$1$. Monocots: Seeds contain only $1$ cotyledon.
$2$. Dicots: Seeds contain $2$ cotyledons.

(N/A) The diagram of $Spirogyra$ shows a filamentous green alga with a characteristic spiral-shaped chloroplast.
Key features to label:
$1$. Cell wall: The outermost protective layer of the cell.
$2$. Pyrenoid: Small,proteinaceous bodies embedded within the chloroplast,involved in starch storage.
$3$. Nucleus: The central organelle containing genetic material,usually suspended in the center of the cell by cytoplasmic strands.
$4$. Chloroplast: The ribbon-like,spiral structure responsible for photosynthesis.

(N/A) $(i)$ Vascular cryptogams (Pteridophytes) are plants that possess vascular tissues but do not produce seeds. Examples: $(a)$ Marsilea,$(b)$ Ferns (e.g.,Dryopteris).
$(ii)$ Naked seeded plants (Gymnosperms) are plants that produce seeds that are not enclosed within a fruit. Examples: $(a)$ Pinus,$(b)$ Cycas.
$(iii)$ Flowering plants (Angiosperms) are plants that produce seeds enclosed within fruits and have specialized reproductive structures called flowers. Examples: $(a)$ Paphiopedilum (Orchid),$(b)$ Ipomoea (Morning glory).

(N/A) The plant structure that helps in attaching the plant to the substratum is called the $Rhizoid$ or the $Thallus$ itself.
$(b)$ This plant belongs to the group $Thallophyta$,as the plant body is not differentiated into roots,stems,and leaves.
$(c)$ This plant could be an $Alga$ (e.g.,$Spirogyra$ or $Ulothrix$).

(N/A) Angiosperms are so called because they produce seeds that are enclosed within a fruit,which develops from the ovary.
Seeds develop within the ovary,which matures into a fruit after fertilization.
Cotyledons are considered an important part of the seed because they are embryonic leaves. They often serve as a food storage organ for the developing embryo and,in many cases,emerge and become green to perform photosynthesis when the seed germinates.

(N/A) Bryophyta.
$(b)$ $(i)$ They are mostly terrestrial plants.
$(ii)$ They are found in damp and shady places.
$(iii)$ The plant body is commonly differentiated into stem and leaf-like structures.
$(c)$ The diagram represents a moss plant (Funaria),which is a member of the Bryophyta group. It shows the gametophyte with leaf-like structures and rhizoids,and the sporophyte consisting of a foot,seta,and capsule.

(C) Specialised tissues for the conduction of water and minerals are known as vascular tissues (xylem and phloem).
$(i)$ Thallophyta: These are simple plants without differentiated plant bodies and lack vascular tissues.
$(ii)$ Bryophyta: These are known as amphibians of the plant kingdom and lack true vascular tissues.
$(iii)$ Pteridophyta: These are the first terrestrial plants to possess vascular tissues (xylem and phloem).
$(iv)$ Gymnosperms: These are seed-bearing plants that possess well-developed vascular tissues.
Therefore,both Pteridophyta and Gymnosperms have specialised tissues for the conduction of water.

(D) The plant kingdom is classified into various groups based on their characteristics.
$1$. Thallophyta,Bryophyta,and Pteridophyta are cryptogams,meaning they do not produce seeds and have inconspicuous reproductive organs.
$2$. Gymnosperms and Angiosperms are phanerogams,which are seed-bearing plants.
$3$. Gymnosperms produce naked seeds,while Angiosperms produce seeds enclosed within fruits.
Therefore,among the given options,Gymnosperms are the ones that produce seeds.

(A) Pteridophytes are vascular cryptogams,meaning they possess xylem and phloem for the conduction of water and nutrients.
They have well-differentiated plant bodies consisting of true roots,stems,and leaves.
However,they are non-flowering plants and do not produce seeds.
Therefore,they lack flowers and seeds.

(FALSE) The statement is False.
Cryptogamae is derived from the Greek words 'kryptos' (hidden) and 'gamos' (marriage).
Therefore,Cryptogamae refers to plants with 'hidden' or 'inconspicuous' reproductive organs,not open ones.
Plants with visible or open reproductive organs are known as Phanerogamae.

(FALSE) The statement is False.
Pteridophytes are plants that have well-differentiated plant bodies but do not produce seeds; they reproduce through spores.
Plants that produce seeds are classified as Phanerogams (Gymnosperms and Angiosperms),not Pteridophytes.

(FALSE) The statement is False.
Explanation: Bryophytes are known as the amphibians of the plant kingdom because they can live in soil but are dependent on water for sexual reproduction. Thallophytes,on the other hand,are plants that do not have a well-differentiated body structure (thallus) and are primarily aquatic.

(B) The statement is $False$.
$Angiosperms$ are flowering plants in which the seeds are enclosed within fruits.
Plants that bear naked seeds (seeds not enclosed in fruits) belong to the group $Gymnosperms$.

(TRUE) The statement is True.
Gymnosperms are plants in which the ovules are not enclosed by any ovary wall and remain exposed both before and after fertilization.
They are typically perennial (living for many years),evergreen (retaining leaves throughout the year),and woody (having stems that are hard and lignified).