Mix Examples- Anatomy of Flowering Plants Questions in English

(C) . Anatomy is the branch of botany that deals with the study of the internal structure of plants.
$N. Grew$ is known as the father of plant anatomy $(1682)$ and he coined the terms tissue and parenchyma.

(D) The primary plant body is formed by the activity of apical meristems.
It consists of various types of tissues that differentiate from these meristems.
$1$. Meristematic tissues are responsible for the continuous division and growth of the plant.
$2$. Simple tissues (like parenchyma,collenchyma,and sclerenchyma) provide structural support and storage.
$3$. Complex tissues (like xylem and phloem) are involved in the transport of water,minerals,and food.
Therefore,the primary plant body is composed of all these tissue types working together to maintain plant functions.

(B) The presence of vessels is considered an advanced character in plants. Vessels are characteristic features of angiosperms (flowering plants),which are evolutionarily more advanced compared to gymnosperms and pteridophytes that typically lack vessels in their xylem.

(D) Angiosperms are typically characterized by the presence of vessels in their xylem. However,there are a few primitive angiosperms that lack vessels. $Trochodendron$,$Tetracentron$,and $Amborella$ are well-known examples of vessel-less angiosperms. While $Hydrilla$ is an aquatic angiosperm,it also exhibits a reduction or absence of vessels due to its submerged habitat. Therefore,all the given options represent plants that are considered vessel-less or have highly reduced vessel elements.

(D) Pith,also known as medulla,is a tissue in the stems of vascular plants. It is composed of soft,spongy parenchyma cells which store and transport nutrients throughout the plant. In dicot stems,the pith is located in the central part of the stem,surrounded by the vascular bundles. Since the given options (Epidermis,Endodermis,Pericycle) are layers of the stem cortex or stele and do not represent the pith itself,the correct answer is that pith cells are found in the central region of the stem,not in the listed options.

(A) In plant anatomy,crystals of calcium oxalate are common inclusions within cells.
$Druses$ are star-shaped or spherical clusters of calcium oxalate crystals.
These are commonly found in various plant species,including $Dioscorea$ (yam).
$Cystoliths$ are calcium carbonate deposits found in specialized cells called $Lithocysts$,which are distinct from the star-shaped $Druses$.

(C) Physiological xerophytes are plants that grow in habitats where water is available but is difficult to absorb due to high salt concentration or low temperature. These plants exhibit xerophytic adaptations to prevent water loss. $Rhizophora$ is a mangrove plant that grows in saline soil (halophyte). Since high salt concentration creates physiological drought,$Rhizophora$ exhibits physiological xerophytic characters to manage water uptake and transpiration.

(C) $Aerenchyma$ is a specialized tissue containing large air spaces,which is a characteristic feature of hydrophytes (aquatic plants) to provide buoyancy and facilitate gas exchange. In contrast,xerophytes (plants adapted to dry environments) possess features like thick cuticles,sunken stomata,and well-developed mechanical tissues to minimize water loss and provide structural support.

(D) In botany,both $Morphology$ (external structure) and $Anatomy$ (internal structure) are crucial for understanding the evolutionary history and phylogeny of plants. $Morphology$ provides insights into adaptations to the environment,while $Anatomy$ reveals structural modifications that reflect evolutionary relationships and common ancestry. Therefore,both are used to represent changes in the context of plant evolution.

(B) The branch of biology that deals with the internal structure of organisms is known as $Anatomy$.
$Cytology$ is the study of cells.
$Physiology$ is the study of the functions of living organisms and their parts.
$Ecology$ is the study of the relationship between organisms and their environment.
Therefore,the study of the internal structure of plants is called $Anatomy$.

(A) Incorrect: Photophosphorylation and oxidative phosphorylation involve the movement of protons from the lumen/intermembrane space to the stroma/matrix,which is a downhill movement (down the electrochemical gradient) through $ATP$ synthase.
$(B)$ Incorrect: In dicot stems,the intrafascicular cambium is present,and the interfascicular cambium originates from medullary ray cells,not the pericycle. Pericycle involvement in cambium formation is specific to dicot roots.
$(C)$ Correct: Polyandrous condition refers to the presence of free stamens. Both Gloriosa and Petunia exhibit this condition.
$(D)$ Correct: Symbiotic nitrogen fixers like $Rhizobium$ and $Frankia$ can exist in a free-living state in the soil as aerobes and only fix nitrogen when they establish a symbiotic relationship.
Therefore,statements $(C)$ and $(D)$ are correct. The total number of correct statements is $2$.

(B) The provided figure shows a vascular bundle consisting of xylem and phloem arranged together in the same radius,which is characteristic of a conjoint vascular bundle.
Between the xylem and phloem,a strip of cambium is present,which indicates that it is an 'open' vascular bundle.
Such bundles are typically found in dicot stems,where the cambium allows for secondary growth.
Therefore,the figure represents a conjoint open vascular bundle.

(D) The correct matches are as follows:
$(a)$ Dicot leaf: Contains differentiated mesophyll tissue into $(q)$ Palisade and spongy mesophyll.
$(b)$ Dicot stem: Characterized by vascular bundles with $(r)$ Endarch xylem.
$(c)$ Monocot root: Typically exhibits $(p)$ Polyarch condition (many xylem bundles).
$(d)$ Monocot leaf: Contains specialized motor cells known as $(s)$ Bulliform cells.
Therefore,the correct sequence is $a-q, b-r, c-p, d-s$.

(A) Let us analyze each statement:
$(A)$ Incorrect: Uneven thickening of the cell wall is a characteristic feature of collenchyma,not sclerenchyma.
$(B)$ Correct: According to the histogen theory,the periblem gives rise to the cortex of the stem and root.
$(C)$ Correct: Tracheids are the primary water-conducting elements in gymnosperms,as vessels are generally absent.
$(D)$ Incorrect: Companion cells possess a nucleus at maturity; it is the sieve tube elements that are devoid of a nucleus at maturity.
$(E)$ Correct: Commercial cork is obtained from the bark of the oak tree known as $Quercus$ $suber$.
Therefore,statements $(B), (C),$ and $(E)$ are true.

(D) Based on the anatomical structure of a dicot leaf:
$A$ represents the upper epidermis.
$B$ represents the palisade parenchyma,which consists of elongated cells located below the upper epidermis.
$C$ represents the spongy parenchyma,which consists of loosely arranged cells with intercellular spaces.
$D$ represents the sub-stomatal cavity (air space).
$E$ represents the stoma (pore).
$F$ represents the phloem,which is located towards the lower side of the vascular bundle.
$G$ represents the metaxylem,which consists of larger vessels.
$H$ represents the protoxylem,which consists of smaller vessels located towards the upper side.
Therefore,option $D$ is the correct identification of the labeled parts.

(N/A) The anatomical differences are as follows:
$(a)$ Monocot root vs. Dicot root:
- In dicot roots,the vascular bundles are usually $2$ to $4$ (diarch to tetrarch),whereas in monocot roots,they are polyarch (more than $6$).
- Dicot roots show secondary growth,while monocot roots do not.
- Pith is small or absent in dicot roots,but large and well-developed in monocot roots.
$(b)$ Monocot stem vs. Dicot stem:
- In dicot stems,vascular bundles are arranged in a ring,whereas in monocot stems,they are scattered throughout the ground tissue.
- Dicot stems have a distinct cortex,endodermis,pericycle,and pith,whereas these are not clearly differentiated in monocot stems.
- Vascular bundles in dicot stems are open (possess cambium),while in monocot stems,they are closed (lack cambium).

(N/A) The study of plant anatomy helps us to understand the structural adaptations of plants with respect to diverse environmental conditions.
It also helps us to distinguish between monocots,dicots,and gymnosperms.
Such a study is closely linked to plant physiology,which aids in the improvement of food crops.
The study of plant structure allows us to predict the strength and quality of wood,which is useful in utilizing it to its full potential.
Furthermore,the study of various plant fibres,such as jute and flax,helps in their commercial exploitation and industrial application.

(N/A) $\rightarrow$ The study of the internal structure of plants is known as anatomy.
$\rightarrow$ Plants are composed of cells as the basic unit. These cells are organized into tissues,which in turn form organs.
$\rightarrow$ Different organs within a plant exhibit variations in their internal structure.
$\rightarrow$ Within angiosperms,monocots and dicots show significant anatomical differences.
$\rightarrow$ Internal structures also demonstrate adaptations to diverse environmental conditions.
$\rightarrow$ Importance: Anatomy helps in understanding how plants function,how they transport water and nutrients,how they provide mechanical support,and how they adapt to different habitats.

(N/A) Sieve tube: It is a component of the phloem tissue. Its primary function is the translocation of synthesized food (sugars) from source to sink throughout the plant body.
$(b)$ Interfascicular cambium: It is a type of secondary meristematic tissue that develops from medullary ray cells located between vascular bundles. Its function is to facilitate secondary growth in dicot stems and roots by producing secondary xylem and secondary phloem.
$(c)$ Collenchyma: It provides mechanical support to the growing parts of the plant,such as young stems and petioles of leaves. It allows for flexibility and tensile strength due to the uneven thickening of cell walls at the corners.
$(d)$ Aerenchyma: It is a specialized type of parenchyma tissue containing large air cavities. Its primary function is to provide buoyancy to aquatic plants,allowing them to float,and to facilitate gas exchange in submerged conditions.

(N/A) The differences between Stele and Vascular bundle are as follows:
| Feature | Stele | Vascular bundle |
| :--- | :--- | :--- |
| Definition | It is the central part of the root or stem,internal to the endodermis. | It is a strand of conducting tissue consisting of xylem and phloem. |
| Components | It includes the pericycle,vascular bundles,and pith. | It consists of xylem and phloem,and sometimes cambium in dicots. |
| Scope | It represents the entire central core of the plant axis. | It is a specific unit of the conducting system found within the stele. |

(N/A) The differences between protoxylem and metaxylem are as follows:
| Feature | Protoxylem | Metaxylem |
| :--- | :--- | :--- |
| Formation | It is the first-formed primary xylem. | It is the later-formed primary xylem. |
| Maturation | It matures before the growth and differentiation of plant organs. | It matures after the growth and differentiation of plant organs. |
| Vessel Diameter | It has vessels with a smaller diameter. | It has vessels with a larger diameter. |
| Tyloses | Tyloses are generally absent. | Tyloses are generally present. |
| Fibres | Xylem fibres are typically absent. | Xylem fibres are typically present. |

(A) $(i)$ Heartwood is the inner,older part of the secondary xylem that is dark brown in color due to the deposition of organic compounds like tannins,resins,oils,gums,aromatic substances,and essential oils.
$(ii)$ In Dicot roots,the pith is either small or completely absent,whereas in Monocot roots,the pith is large and well-developed.

(C) The correct matches are as follows:
$(a)$. Hypodermis in dicot stem is made of collenchyma cells,providing mechanical support. Thus,$(a)-(iii)$.
$(b)$. Pericycle in dicot stem is typically sclerenchymatous (often present as semi-lunar patches above phloem). Thus,$(b)-(iv)$.
$(c)$. Ground tissue in monocot stem is undifferentiated and parenchymatous. Thus,$(c)-(ii)$.
$(d)$. Phloem parenchyma is absent in monocot stems. Thus,$(d)-(i)$.
Therefore,the correct sequence is $a(iii), b(iv), c(ii), d(i)$.

(D) The families $Winteraceae$,$Tetracentraceae$,and $Trochodendraceae$ are considered primitive angiosperms.
These plants lack vessel elements in their xylem,which is a characteristic feature usually associated with gymnosperms.
Additionally,they do not possess albuminous cells (which are specialized parenchyma cells in gymnosperms analogous to companion cells in angiosperms).
Since both statements $B$ and $C$ are correct,the correct answer is $D$.

(D) Bast fibres are phloem fibres,which are composed of sclerenchymatous cells,not collenchymatous cells. Therefore,the Assertion is incorrect.
Fibres are commonly present in the secondary phloem of many plants. Therefore,the Reason is also incorrect.
Thus,both Assertion and Reason are incorrect.

(D) In woody plants,the interior parts of the stem consist of dead cells such as xylem vessels and tracheids,which provide mechanical support and facilitate the conduction of water and minerals.
Additionally,living cells are present in the inner layers (like the cambium and parenchyma) which are responsible for storage and transport of nutrients.
Therefore,the interior of a plant contains both dead cells for support/conduction and living cells for storage/transport.

(C) Cells with the capacity to divide actively are known as Meristem $(ii)$.
$(b)$ $A$ tissue where all cells are similar in structure and function is called a Simple tissue $(iv)$.
$(c)$ $A$ tissue having different types of cells is a Complex tissue,such as Vascular tissue $(i)$.
$(d)$ Dead cells with highly thickened walls and narrow lumen are Sclereids $(iii)$.
Therefore,the correct matching is $(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)$.

(A) The statement regarding $DNA$ elution is a general fact in biotechnology,but the question asks to evaluate the statements $(a)$ through $(e)$ related to plant anatomy:
$(a)$ In roots,xylem and phloem are arranged in an alternate manner on different radii (radial vascular bundles). This is correct.
$(b)$ Conjoint closed vascular bundles lack cambium,which is correct.
$(c)$ In open vascular bundles,cambium is present between xylem and phloem,which is correct.
$(d)$ Dicotyledonous stems have vascular bundles with endarch protoxylem,which is correct.
$(e)$ Monocotyledonous roots are polyarch,meaning they typically have more than six xylem bundles,which is correct.
Since all statements $(a), (b), (c), (d),$ and $(e)$ are correct,and no option includes all five,we re-evaluate the provided options. Given the standard structure of such questions,if the question implies selecting the set of correct statements,and all are correct,the provided options might be incomplete. However,based on the provided choices,$(a), (b), (c), (d),$ and $(e)$ are all anatomically accurate. If we must choose the most comprehensive set,there is an error in the options provided by the source. Assuming the question intended to test all,all are correct.

(D) The image shows tracheids,which are elongated,tube-like cells with tapering ends and lignified walls.
Tracheids are the primary water-conducting elements in Pteridophytes and Gymnosperms.
In Angiosperms,while vessels are the primary conducting elements,tracheids are also present.
Therefore,tracheids are found in all three groups: Pteridophytes,Gymnosperms,and Angiosperms.

(D) Based on the provided figures:
$1$. $(A)$ represents the Guard cells of a stoma.
$2$. $(B)$ shows Xylem and Phloem arranged in an alternating manner on different radii,which is characteristic of the Radial vascular bundle.
$3$. $(C)$ shows a Conjoint vascular bundle where Xylem and Phloem are on the same radius,and there is no cambium present between them,making it a Conjoint closed vascular bundle.
$4$. $(D)$ shows a Conjoint vascular bundle with a strip of cambium present between Xylem and Phloem,making it a Conjoint open vascular bundle.
Therefore,the correct identification is $A \rightarrow$ Guard cells,$B \rightarrow$ Radial condition,$C \rightarrow$ Conjoint closed,$D \rightarrow$ Conjoint open.

$(A)$. Radial,tetrarch,cambial ring between xylem and phloem at later stages corresponds to $T.S$ of dicot root $(A-ii)$.
$B$. Conjoint,open and endarch vascular bundles are characteristic of dicot stem $(B-iv)$.
$C$. Radial,polyarch,large pith without cambial ring is characteristic of monocot root $(C-iii)$.
$D$. Conjoint,closed with sclerenchymatous bundle sheath is characteristic of monocot stem $(D-i)$.
Therefore,the correct matching is $A-ii, B-iv, C-iii, D-i$.