Root Questions in English

(B) Sweet potato $(Ipomoea \text{ } batatas)$ is a modified adventitious root.
These roots become swollen and fleshy to store food, primarily in the form of starch.
Unlike tap roots, which develop from the radicle, adventitious roots arise from parts of the plant other than the radicle, such as the stem or leaves.
Other examples of modified adventitious roots include $Cassava$ and $Dahlia$.

(C) Nymphaea,Sagittaria,Ceratophyllum,and Vallisneria are hydrophytes that grow in water.
Nymphaea,Sagittaria,and Vallisneria are rooted hydrophytes,meaning they are anchored in the mud.
Ceratophyllum is a submerged,free-floating hydrophyte.
It remains completely underwater but is not rooted in the mud.
Ceratophyllum lacks roots even during its embryonic stage.

(C) Orchids are epiphytes that possess aerial roots. These roots contain a specialized spongy tissue called velamen. The primary function of velamen is to absorb moisture from the atmosphere or air,which is essential for the survival of these plants as they do not grow in soil.

(N/A) Modification of root refers to the structural changes in roots to perform functions other than the primary functions of absorption and conduction of water and minerals. These functions include food storage,mechanical support,and respiration.
$(a)$ Banyan tree: These plants exhibit prop roots. These are adventitious roots that arise from the branches and grow downwards to provide mechanical support to the heavy,spreading tree.
$(b)$ Turnip: These plants exhibit storage roots. The tap root becomes fleshy and swollen to store food reserves.
$(c)$ Mangrove trees: These plants exhibit pneumatophores. These are specialized roots that grow vertically upwards (negatively geotropic) from the soil to facilitate the exchange of gases (respiration) in waterlogged,anaerobic soil conditions.

(N/A)

Fibrous root	Adventitious root
$(1)$ In monocots,the primary root which develops from the radicle of the seed is short-lived and is replaced by a large number of roots arising from the base of the stem.	$(1)$ These roots arise from any part of the plant other than the radicle of the seed.
$(2)$ It is found in wheat and other cereals.	$(2)$ It is found in banyan,Monstera,and other plants.

(N/A) The root system is classified into three types based on its origin:
$1$. Tap Root System: In most dicotyledonous plants,the direct elongation of the radicle leads to the formation of the primary root,which grows inside the soil. It bears lateral roots of several orders that are referred to as secondary,tertiary,etc. roots. Example: Mustard plant.
$2$. Fibrous Root System: In monocotyledonous plants,the primary root is short-lived and is replaced by a large number of roots. These roots originate from the base of the stem and constitute the fibrous root system. Example: Wheat plant.
$3$. Adventitious Root System: In some plants,like grass,Monstera,and the banyan tree,roots arise from parts of the plant other than the radicle and are called adventitious roots.
Functions of the root system:
$(i)$ Absorption of water and minerals from the soil.
(ii) Providing a proper anchorage to the plant parts.
(iii) Storing reserve food material.
(iv) Synthesis of plant growth regulators.

(N/A) The root tip is divided into several distinct regions:
$\rightarrow$ Root Cap: The root is covered at the apex by a thimble-like structure called the root cap. It protects the tender apex of the root as it makes its way through the soil.
$\rightarrow$ Region of Meristematic Activity: The cells of this region are very small,thin-walled,and have dense protoplasm. They divide repeatedly.
$\rightarrow$ Region of Elongation: The cells proximal to the meristematic region undergo rapid elongation and enlargement and are responsible for the growth of the root in length.
$\rightarrow$ Region of Maturation: The cells of the elongation zone gradually differentiate and mature. This zone,proximal to the region of elongation,is called the region of maturation. Some epidermal cells in this region form very fine and delicate,thread-like structures called root hairs.

(N/A) $\rightarrow$ Roots in some plants change their shape and structure to perform functions other than absorption and conduction of water and minerals. These are called modifications of roots.
$\rightarrow$ Roots are modified for support, storage of food, and respiration.
$\rightarrow$ Modifications for food storage:
$(a)$ Tap root modifications: In carrot, the tap root stores food and becomes cone-shaped (conical). In radish, it becomes spindle-shaped (fusiform). In turnip and beet root, it becomes top-shaped (napiform).
$(b)$ Adventitious root modifications: In sweet potato, adventitious roots become swollen due to food storage, known as simple tuberous roots. In Asparagus and Dahlia, clusters of swollen roots are formed, known as fasciculated tuberous roots.
$\rightarrow$ Modifications for support:
$(a)$ Stilt roots: These are supporting roots that come out of the lower nodes of the stem in plants like maize and sugarcane to provide mechanical support.
$(b)$ Prop roots: These are hanging structures that support the tree, e.g., Banyan tree.

(N/A) The main functions of the root system are as follows:
$(i)$ Absorption of water and minerals from the soil.
$(ii)$ Providing proper anchorage to the plant parts.
$(iii)$ Storing reserve food material.
$(iv)$ Synthesis of plant growth regulators.

(N/A) The root tip is divided into three main regions based on the activity of the cells:
$1$. Region of Meristematic Activity: This is located a few millimeters above the root cap. The cells in this region are very small,thin-walled,and with dense protoplasm. They divide repeatedly.
$2$. Region of Elongation: This region is located just above the meristematic region. The cells here undergo rapid elongation and enlargement,which is responsible for the growth of the root in length.
$3$. Region of Maturation: This region is proximal to the elongation region. The cells in this zone gradually differentiate and mature. Some of the epidermal cells in this region form very fine,delicate,thread-like structures called root hairs,which absorb water and minerals from the soil.

(N/A) $\Rightarrow$ Modifications of roots for food storage:
$(a)$ Storage in tap roots: In carrots,the tap root stores food and becomes conical in shape. In radish,it stores food and becomes fusiform (spindle-shaped). In turnip and beet,the root stores food and becomes napiform (top-shaped).
$(b)$ Storage in adventitious roots: In sweet potato,the adventitious roots store food and become swollen and irregular in shape. These are called simple tuberous roots.
$\Rightarrow$ In asparagus and dahlia,the roots store food and occur in clusters. These are called fasciculated tuberous roots.

(N/A) Modifications of roots for support include Prop roots and Stilt roots.
$(a)$ Prop roots: In Banyan trees (Ficus benghalensis),roots arise from the branches and grow downwards into the soil,providing mechanical support to the tree. These are called prop roots.
$(b)$ Stilt roots: In plants like Maize and Sugarcane,adventitious roots arise from the lower nodes of the stem,grow obliquely downwards,and enter the soil to provide mechanical support. These are called stilt roots.
Note: Pneumatophores (Respiratory roots) are modifications for respiration,not support. These are found in plants growing in swampy areas (e.g.,Rhizophora),where roots grow vertically upwards out of the soil to obtain oxygen.

(N/A)

Tap root system	Fibrous root system
$(1)$ Generally present in dicot plants.	$(1)$ Generally present in monocot plants.
$(2)$ Develops from the radicle of the embryo.	$(2)$ The primary root is short-lived and replaced by a large number of roots originating from the base of the stem.
$(3)$ Consists of a primary root and its branches (secondary,tertiary,etc.).	$(3)$ Consists of a cluster of roots arising from the base of the stem; no distinct primary root is visible.
$(4)$ The main root (tap root) can be clearly identified.	$(4)$ No single main root can be identified as they are all similar in size.
$(5)$ It penetrates deep into the soil.	$(5)$ These roots are shallow and do not penetrate deep into the soil.

(N/A) $\rightarrow$ Plants that grow in muddy and saline soil along the seashore are known as mangroves. $Rhizophora$ is a classic example of a mangrove plant.
In such environments,the soil is waterlogged and saline,which significantly reduces the availability of oxygen for the root system.
To overcome this oxygen deficiency,$Rhizophora$ develops specialized roots that grow vertically upwards,against the direction of gravity (negatively geotropic),emerging above the soil surface.
These roots,known as pneumatophores or breathing roots,contain small pores called lenticels.
These pores facilitate the exchange of gases,allowing the plant to absorb $O_2$ directly from the atmosphere to support the metabolic activities of the root system.

(N/A) $(i)$ The leaf is a lateral,generally flattened structure borne on the stem. It develops at the node and bears a bud in its axil.
$(ii)$ The root is the underground part of the plant that typically grows towards gravity (geotropism),soil,and water (hydrotropism),and away from sunlight and air.

(N/A) $(i)$ In banyan tree,prop roots are produced from branches and grow downwards towards the soil. These roots provide support to the tree.
$(ii)$ In sugarcane and maize,stilt roots are produced from the lower nodes of the stem. These roots enter the soil and provide support to the plant,protecting it against strong winds.

(N/A) $\rightarrow$ Generally, terrestrial roots show a network of branches that function to absorb water and minerals from the soil and to provide anchorage.
$\rightarrow$ In aquatic plants, modifications of their normal functions and deviations are seen. For example, in plants like $Trapa$ and $Tinospora$, roots are green and much-branched, which increases the surface area for photosynthesis. In plants like $Jussiaea$, roots become balloon-like (aerenchyma) to store air, allowing the plant to float on water and facilitating gas exchange.
$\rightarrow$ Differences between Aquatic Roots and Terrestrial Roots:

$1$. Aquatic Root	$1$. Terrestrial Root
$1$. Roots may be absent (e.g., $Wolffia$). If present, they are poorly developed, thin, and adventitious.	$1$. Roots are well-developed with root caps, root hairs, and branches.
$2$. Vascular tissues are less developed.	$2$. Vascular bundles are well-developed.
$3$. Modified for photosynthesis, buoyancy, and gas exchange.	$3$. Primarily for fixation and absorption of water and minerals from the soil.

(N/A) Root formation,or root development,occurs in several distinct stages starting from the embryo within the seed:
$1$. Germination and Radicle Emergence: Upon imbibition of water,the embryo activates. The radicle is the first part to emerge from the seed,establishing the primary root system.
$2$. Cell Division (Meristematic Zone): At the root tip,the root apical meristem undergoes rapid mitosis,producing new cells that contribute to root growth.
$3$. Cell Elongation (Elongation Zone): Cells produced by the meristem undergo rapid expansion in length,which is the primary driver of root penetration into the soil.
$4$. Cell Differentiation (Maturation Zone): Cells differentiate into specialized tissues such as the epidermis (with root hairs for absorption),cortex,endodermis,and vascular cylinder (xylem and phloem) for transport.

(B) $(i)$ In wheat,the primary root is short-lived and is replaced by a large number of roots that originate from the base of the stem,known as fibrous roots. In the Banyan tree,roots arise from the branches,which are known as adventitious roots (specifically prop roots).
(ii) In Rhizophora,roots grow vertically upwards out of the ground to get oxygen for respiration,known as respiratory roots (pneumatophores). In Turnip,the roots are modified for the storage of food,known as storage roots.

(B) Plants growing in marshy areas or swamps face a deficiency of oxygen in the soil due to waterlogging.
To overcome this,these plants develop special roots called pneumatophores or breathing roots.
These roots grow vertically upwards (negatively geotropic) out of the soil and water to absorb oxygen from the atmosphere through small pores called lenticels.
An example of such a plant is $Rhizophora$.

(C) $\rightarrow$ Pneumatophores: Plants growing in swampy,saline,and humid areas near the seashore are known as Mangroves.
$\rightarrow$ Many roots of these plants grow vertically upwards,opposite to the direction of gravity,emerging directly from the soil.
$\rightarrow$ Such roots are porous and unbranched. They help the plant obtain oxygen for respiration in waterlogged,oxygen-deficient soil. These are called Pneumatophores or respiratory roots.

(B) In monocotyledonous plants,the primary root is short-lived and is replaced by a large number of roots. These roots originate from the base of the stem and constitute the fibrous root system,as seen in wheat and grass.

(C) Pneumatophores are specialized negatively geotropic roots that grow vertically upwards out of the soil or water to facilitate gaseous exchange in plants growing in swampy or saline areas (mangroves).
Examples of such plants include Avicennia,Rhizophora,and Sonneratia.

(D) Respiratory roots,also known as pneumatophores,are specialized root structures that grow vertically upwards (negatively geotropic) to facilitate gaseous exchange in oxygen-deficient,waterlogged soil.
These roots are characteristic of halophytic plants that grow in tidal swamps,such as mangrove plants (e.g.,$Rhizophora$).

(A) Prop roots, also known as pillar roots, are specialized adventitious roots that grow downwards from the horizontal branches of trees, such as the banyan tree $(Ficus \text{ } benghalensis)$.
These roots initially grow in the air and are hygroscopic in nature.
Once they reach the soil, they penetrate it, become thick, and develop a pillar-like structure.
Their primary function is to provide mechanical support to the heavy, spreading branches of the tree.

(B) The sweet potato $(Ipomoea \text{ } batatas)$ is a classic example of a tuberous adventitious root.
In sweet potatoes, the adventitious roots become swollen and fleshy to store food.
Unlike the potato, which is a modified stem (tuber), the sweet potato is a modified root.

(B) The correct answer is $B$ (Meristematic activity).
$A$ typical root possesses four distinct regions:
$(i)$ Root Cap: The root is covered at the apex by a thimble-like structure called the root cap. It protects the tender apex of the root as it makes its way through the soil.
$(ii)$ Region of Meristematic Activity: This region is located a few millimeters above the root cap. The cells of this region are very small,thin-walled,and contain dense protoplasm. They divide repeatedly.
$(iii)$ Region of Elongation: The cells proximal to the meristematic zone undergo rapid elongation and enlargement,which is responsible for the growth of the root in length.
$(iv)$ Region of Maturation: The cells of the elongation zone gradually differentiate and mature. This zone lies just proximal to the region of elongation.

(A) Roots that develop from any part of the plant other than the radicle are known as adventitious roots.
Examples include grass,$Monstera$,and the banyan tree.

(C) When the primary root,which develops from the radicle of the embryo,remains as the main root throughout the life of the plant and grows straight downward into the soil,it is called a tap root. This type of root system is characteristic of dicotyledonous plants.

(D) The root system is divided into different regions: the root cap,the region of meristematic activity,the region of elongation,and the region of maturation.
Root hairs are unicellular,tubular extensions of the epidermal cells (epiblema) found specifically in the region of maturation.
These hairs are responsible for the absorption of water and minerals from the soil.
Therefore,the correct option is $D$.

(A) The root hairs are tubular extensions of the epidermal cells of the root.
They significantly increase the surface area available for the absorption of water and minerals from the soil.
Root hairs are unicellular and are found in the maturation zone of the root.

(D) Statement $I$ is incorrect because root hairs arise from the region of maturation,not the region of elongation.
Statement $II$ is correct; $Rhizophora$ plants growing in swampy areas possess pneumatophores (respiratory roots) that grow vertically upwards to obtain oxygen.
Statement $III$ is correct; the banyan tree exhibits adventitious roots that arise from the branches.
Statement $IV$ is incorrect; maize and sugarcane possess stilt roots,not prop roots. Prop roots are specifically found in the banyan tree. Therefore,statements $II$ and $III$ are correct.

(D) fibrous root system consists of a dense network of roots that originate from the base of the stem. Unlike the tap root system,which penetrates deep into the soil,the fibrous root system spreads horizontally near the soil surface. This extensive network of fine roots binds the soil particles together effectively,thereby providing excellent anchorage for the plant.

(B) $Trapa$ $\text{natans}$ is a hydrophyte. It possesses a $monarch$ condition (a single xylem strand) in its slender roots and spongy petioles.

(B) In monocotyledonous plants,the primary root is short-lived and is replaced by a large number of roots. These roots originate from the base of the stem and constitute the fibrous root system,as seen in wheat or rice plants.

(C) The smallest region of the root is the region of meristematic activity,also known as the growing point.
In this region,the cells are very small,thin-walled,and possess dense cytoplasm.
These cells are actively dividing to produce new cells for the growth of the root.

(C) Diagram $A$ shows modified roots for food storage (carrot,turnip,sweet potato). Diagram $B$ shows pneumatophores,which are specialized roots found in plants growing in swampy or marshy areas (e.g.,$Rhizophora$). These roots grow vertically upwards out of the ground to obtain oxygen for respiration. Therefore,the statement that they are found in sandy soil is incorrect.

(D) Orchids possess epiphytic roots,which are covered by a hygroscopic velamen tissue to absorb moisture from the atmosphere.
Sweet potato roots are irregularly swollen and are known as root tubers.
Stilt roots are adventitious roots that arise from the lower nodes of the main stem to provide additional support to the plant,as seen in $Pandanus$ and $Rhizophora$.
Since both statements $B$ and $C$ are correct,and statement $A$ is incorrect (orchids have epiphytic roots,not palmate fleshy roots),the question options provided are slightly ambiguous. However,based on standard botanical facts,$B$ and $C$ are correct. Given the structure,if this is a multiple-choice question,it is likely intended to test the identification of correct root modifications.

(A) In the given diagram of a root tip:
$A$ represents the Region of maturation,which is characterized by the presence of root hairs.
$B$ represents the Region of elongation,where cells undergo rapid elongation and enlargement,responsible for the growth of the root in length.
$C$ represents the Region of meristematic activity,located just above the root cap,where cells are small,thin-walled,and with dense protoplasm,dividing repeatedly.
Therefore,the correct sequence is $A$-Region of maturation,$B$-Region of elongation,$C$-Region of meristematic activity.

(D) In monocots,the primary root degenerates early.
Seminal roots are the roots that arise from the base of the radicle.
These are temporary roots that develop during the early stages of germination.
Fibrous root systems,which replace the primary root,also typically arise from the base of the radicle and lower nodes of the stem.

(B) The primary root is the direct elongation of the radicle during seed germination. The radicle is the embryonic root of the plant.

(C) The mustard plant $(Brassica \text{ } campestris)$ is a dicotyledonous plant.
In dicotyledonous plants, the direct elongation of the radicle leads to the formation of the primary root, which grows inside the soil.
This primary root along with its branches constitutes the tap root system.
Therefore, the type of roots present in the mustard plant is tap roots.

(C) In a tap root system,the primary root is the direct continuation of the radicle.
Secondary and tertiary roots arise from the primary root as lateral branches.
Therefore,the primary root is not a lateral branch,but rather the main axis from which lateral branches originate.

(C) In wheat plants,the primary root is short-lived and is replaced by a large number of roots. These roots originate from the base of the stem and constitute the fibrous root system. Wheat,being a monocotyledonous plant,characteristically exhibits this type of root system.

(D) The primary functions of the root system include the absorption of water and minerals from the soil,providing proper anchorage to the plant parts,storing reserve food materials,and the synthesis of plant growth regulators $(PGRs)$.
Photosynthesis is the process by which green plants synthesize their food using sunlight,which primarily occurs in the leaves,not the roots.

(C) The root grows in length primarily due to the activity of the region of elongation. In this region,the cells undergo rapid enlargement and expansion,which pushes the root tip forward into the soil.

(B) The root system is divided into different zones based on cellular activity.
$1$. The region of meristematic activity consists of small,thin-walled cells with dense protoplasm that divide repeatedly.
$2$. The region of elongation is where cells undergo rapid enlargement and elongation,responsible for the growth of the root in length.
$3$. The region of maturation contains cells that differentiate and mature. In this zone,some epidermal cells form very fine,delicate,thread-like structures called root hairs. These root hairs are responsible for the absorption of water and minerals from the soil.

(D) The root hair zone is the region of maturation in a root.
Root hairs are unicellular,tubular extensions of the epidermal cells (epiblema) of the root.
These structures significantly increase the surface area of the root,which facilitates the maximum absorption of water and minerals from the soil.

(A) The tap roots of carrot get modified to store food. In some plants,the primary root (tap root) becomes fleshy and swollen due to the storage of food materials,which helps the plant survive during unfavorable conditions. Carrot is a classic example of a tap root modification for food storage.