The Leaf

Rose

Reason — A compound leaf is a leaf in which the lamina is divided into several smaller leaflets attached to a common stalk (rachis). Rose leaf is a compound leaf with incisions upto midrib.
Banana, Banyan, Mango have simple leaves.

Cactus

Reason — Cactus has modified leaves into spines due to which it does not trap insects. Insectivorous plants trap and digest insects to obtain nutrients, especially nitrogen, from nutrient-poor soils.
Pitcher plant is insectivorous; traps insects in a pitcher-shaped leaf. Venus flytrap is insectivorous; snaps shut when insects touch its trigger hairs. Bladderwort is insectivorous; uses tiny bladder-like traps to catch small aquatic organisms.

Banana

Reason — In Banana leaves, veins runs parallel to each other. Parallel venation means the veins in the leaf run parallel to each other from the base to the tip. It is commonly found in monocot plants.
Mango, Banyan, Guava have reticulate venation.

Node

Reason — The points on the stem from where the leaves and branches originate are called nodes.
Petiole is the stalk that connects the leaf to the stem. Lamina is the flat, green part of the leaf (leaf blade). Trunk is the main woody stem of a tree.

Carbon Dioxide

Reason — Carbon dioxide is needed for photosynthesis. Photosynthesis is the process by which green plants make their food using carbon dioxide, water, sunlight, and chlorophyll.
Plants need nitrogen for growth and making proteins, but it is not a raw material for photosynthesis. Oxygen is actually produced during photosynthesis, not required as a raw material. Soil provides water and minerals, but photosynthesis can occur without soil if the plant receives water and nutrients by other means (e.g., hydroponics).

Petiole

Reason — The basal part of a leaf is a stalk called petiole, which is attached to the stem at the node. It acts like a "handle" that supports the leaf and connects it to the plant's vascular system (xylem and phloem), through which water and food are transported.
The leaf blade (or lamina) is the broad, flat green part of the leaf. Lamina is another name for the leaf blade. The apex is the tip of the leaf.

Apical bud

Reason — Apical means at the apex or tip. The tip of the shoot has buds called apical buds or terminal buds. They are responsible for the vertical growth of the stem.
Axillary bud is found in axil. Adventitious bud develops from unusual places such as roots, leaves, or internodes. Floral bud develops into a flower.It may occur at different positions and is not defined by being at the shoot tip.

Leaflets

Reason — In a compound leaf, the leaf blade or lamina is divided into smaller units called leaflets. In a compound leaf, the lamina (leaf blade) is divided into several smaller units. These smaller divisions are called leaflets.
Spines are modified leaves or parts of leaves that protect the plant. Stipules are small leaf-like structures found at the base of the petiole in some plants. Tendrils are thin, coiling structures used for climbing.

Prickly poppy

Reason — Prickly poppy has a simple leaf because its lamina is undivided and forms a single leaf blade, although it may have deep lobes. Rose, silk cotton, and neem have compound leaves in which the lamina is divided into separate leaflets attached to a common stalk. Therefore, prickly poppy is not an example of a compound leaf.

Nerium

Reason — Phyllotaxy is the arrangement of leaves on a stem. Nerium has whorled phyllotaxy as it has more than two leaves attached at each node, arranged in a whorl.
Jasmine and Mint have opposite phyllotaxy. Peepal has alternate phyllotaxy.

A is true but R is false.

Reason — A is true as root hairs are very small, thin extensions of the outer cells of roots and help to absorb water and minerals from the soil.
R is false because even in fibrous roots, root hairs are present. In fact, root hairs are found in almost all young roots, whether the plant has tap root or fibrous root.

Therefore, A is true but R is false is the correct option.

A is true but R is false.

Reason — A is true as leaves that are attached directly to the stem without a stalk (petiole) are called sessile leaves.
R is false as sessile leaves do participate in photosynthesis because they generally contain chlorophyll just like other green leaves.

Therefore, A is true but R is false is the correct option.

Both A and R are true but R is not the correct explanation of A.

Reason — A is true as terminal buds (also called apical buds) are present at the tip of the stem and help in increase in length. Axillary buds are present in the axil of leaves and can develop into branches, which also continue growth.
R is true as apical buds are located at the tips of stems and are responsible for the vertical growth (increase in length) of the plant.

Therefore, Both A and R are true but R is not the correct explanation of A is the correct option.

Both A and R are true and R is the correct explanation of A.

Reason — A is true as insectivorous plants trap and digest insects to obtain nutrients.
R is true as these plants usually grow in nitrogen-poor soils. Since nitrogen is essential for growth and is lacking in the soil, they obtain it by digesting insects.

Therefore, Both A and R are true and R is the correct explanation of A is the correct option.

(i) Root
(ii) Shoot
(iii) Lamina / Leaf Blade

The main four functions of the roots are as follows:

1. It helps to anchor the plant firmly to the soil.
2. It absorbs water and minerals from the soil for the growth of the entire plant.
3. It transports the absorbed water and minerals to the shoot system.
4. It binds the soil together so that it does not get washed away during rain or blown away by wind.

(i) Spines — Spines are modifications of leaves as a pointed structure that help to reduce the loss of water by transpiration.
(ii) Tendril — In case of certain weak-stemmed plants, leaves or leaflets are modified into wiry, coiled structures called tendrils. They coil around the object they touch and support the plant to climb up.
(iii) Scale Leaves — Leaves modified as thick and fleshy or thin and dry are called Scale Leaves. Their function is to store food and protect the buds.

Arrangement of veins in the lamina is called venation. It is mainly of two types

1. Reticulate Venation — In this type of venation, veins and veinlets are irregularly distributed in the lamina, forming a network. Example - Mango, Peepal, etc.
2. Parallel Venation — In this type of venation, veins run parallel to each other. Example - Banana, Maize, etc.

In Venus Flytrap, the leaves have long pointed hairs. It is divided into two parts having midrib in between like a hinge. When an insect visits the leaf, it closes its two parts and traps the insect. The insect is then digested by digestive juices secreted by the plant.

Two main functions of the leaves are:

1. Photosynthesis.
2. Transpiration.

Photosynthesis — Photosynthesis is the process by which a plant leaf prepares own food from water and carbon dioxide in the presence of chlorophyll and sunlight.

Transpiration — Transpiration is the process by which water is lost in the form of water vapour by evaporation from the surface of leaves and other aerial parts of a plant.

(i) The Root system and the Shoot system.
(ii) The Tap root system and the Fibrous root system.
(iii) Stem, Buds, Leaves, Flowers, and Fruits.
(iv) Alternate, Opposite, and Whorled.
(v) Reticulate venation and Parallel venation.

(i) Phyllotaxy — The arrangement of leaves on a stem or its branch is called phyllotaxy. Phyllotaxy are of three types- Alternate, Opposite, and Whorled.

(ii) Leaf — Leaves are the flat and green parts of the shoot that grow laterally from the nodes of the stem. They perform important functions like photosynthesis and transpiration.

(iii) Autotrophic nutrition — All green plants have the capability to prepare their own food, and are therefore called autotrophs, and this method of nutrition is called autotrophic nutrition.

(iv) Leaf tendril — In case of certain weak-stemmed plants, leaves or leaflets are modified into wiry, coiled structures called tendrils. They are sensitive to touch. As they touch any object, they coil around it and support the plant to climb up.

(v) Vegetative propagation — Sometimes new plants may also be produced from other (vegetative) parts of the plant such as the roots, stems and leaves instead of seeds. This type of reproduction is called vegetative propagation.

(i) Root hairs
(ii) Internode
(iii) Sessile leaves
(iv) Petiole
(v) Chlorophyll

Differences between Tap Root and Fibrous Root:

Differences between Simple leaf and Compound leaf:

Differences between Parallel venation and Reticulate venation:

Modification seen in bryophyllum are:

1. Bryophyllum is a plant whose leaves produce adventitious buds in their margin.
2. The adventitious buds grow into new plants when they fall off from the parent plant.

Cactus being a desert plant needs to conserve water. So, its leaves are modified into pointed structures called as spines to reduce the loss of water by transpiration.

Leaf survival is so important to plants because:

1. The leaf makes food for the plants by photosynthesis.
2. The leaf gets rid of excess water from plants through transpiration.
3. The leaf carries out the process of respiration in plants.
4. The leaf helps in providing cooling effect to the plant through transpiration.

(i) Banyan is an example of simple leaf while Rose is an example of compound leaf.

Below diagram shows simple and compound leaves:

(ii) Banana is an example of parallel venation while Peepal is an example of reticulate venation.

Below diagram shows reticulate and parallel venation:

The two main advantages of transpiration to green plants are as follow:

1. Cooling effect — The water keeps on evaporating from the leaf surface during transpiration. The heat required for evaporation of water is obtained from the plant itself and thus, the plant cools itself when it is in hot environment.
2. Transpirational pull — The roots of the plant pull up more water from the soil to make up for the water loss during transpiration. As a result, important mineral salts, which is essential for the plant growth, are also brought along with the water from the soil.

Insectivorous plants trap insects because they grow in soil which is usually thin and is also low in nutrients, so insectivorous plants eat insects to fulfil their nitrogen demand.

Modifications of leaves are as follows:

1. Leaf tendril — In case of certain weak-stemmed plants, leaves or leaflets are modified into wiry, coiled structures called tendrils. They coil around the object they touch and support the plant to climb up. E.g., Sweet Pea.
2. Leaf spines — In some plants, leaves are modified into pointed structures called spines. Spines help to reduce water loss by transpiration. E.g., Cactus.
3. Scale leaves — In some plants like Onion and Ginger, thick and fleshy or thin and dry scale leaves are present, respectively. Their function is to store food and protect the buds.

In case of certain weak-stemmed plants, leaves or leaflets are modified into wiry, coiled structures called tendrils. They are sensitive to touch. As they touch any object, they coil around it and support the plant to climb up. E.g., Sweet pea.

Difference between Spines and scale leaves on the basis of significance:

Difference between Vegetative and reproductive parts on the basis of parts of the plant:

Difference between Alternate and opposite phyllotaxy on the basis of number of leaves at each node :

Difference between Pine and peepal on the basis of shape of the leaf:

Difference between Reticulate and parallel venation on the basis of 2 examples:

Diagram:

(i) One important function of axillary buds is to develop into lateral shoots or branches, contributing to the plant's overall growth and structure.

(ii) The two main functions of leaves are:

1. Photosynthesis — The process by which a plant leaf prepares or synthesises food from water and carbon dioxide in the presence of chlorophyll and sunlight is called photosynthesis.
2. Transpiration — This is the process by which water is lost in the form of water vapour by evaporation from the surface of leaves and other aerial parts of a plant. It has a cooling effect and develops a suction force to make roots absorb more water with mineral ions.

(iii) China rose and Rose.

(iv) In case of certain weak-stemmed plants, leaves or leaflets are modified into wiry, coiled structures called tendrils. They are sensitive to touch. As they touch any object, they coil around it and support the plant to climb up.

(v) Cactus

(i)
Plant A — Pitcher Plant
Plant B — Bladderwort
Plant C — Venus Flytrap

(ii) These plants trap insects to meet their nitrogen demands.

(iii) Pitcher plant is found abundantly in Meghalaya.

(iv) In a Pitcher plant, the lamina is modified into a pitcher.

(v) The soil where these plants usually grow is deficient in nitrates.

(i) Phyllotaxy.

(ii)
Figure A shows Alternate phyllotaxy.
Figure B shows Opposite phyllotaxy.
Figure C shows Whorled phyllotaxy.

(iii)
An example of Alternate phyllotaxy — Mint
An example of Opposite phyllotaxy — Jasmine
An example of Whorled phyllotaxy — Oleander (Nerium)

(i) Diagram of simple leaf:

Example — Banyan

(ii) A compound leaf with leaflets arising from different points along the main stalk:

Example — Rose

(iii) A compound leaf with leaflets arising from one single point:

Example — Silk Cotton

(iv) A simple leaf with reticulate venation:

Example — Peepal

(v) Diagram of a simple leaf with parallel venation

Example — Banana

Across :
1. Bryophyllum
2. Lamina
3. Root
4. Bud

Down :
5. Midrib
6. Spine

(i) A simple leaf has a single, undivided leaf blade (lamina) whereas a compound leaf has the leaf blade divided into many smaller parts called leaflets.

(ii) Rose leaf is a compound leaf with incision upto midrib whereas Silk cotton leaf is a compound leaf with with incision upto petiole.

(iii) Peepal, Guava, Mango, Banana are simple leaves.
Neem and Gulmohar are compound leaves.

(iv) The basal part of a leaf is a stalk called petiole. Petiole continues into a lamina as midrib.