Anatomy Of Flowering Plants

This question requires matching items from List I (plant structures or descriptions), List II (types of fruits or structures), and List III (examples or characteristics). Let’s analyze each item in List I and find the correct matches step by step. - A) One seeded bits of fruits "One seeded bits of fruits" refers to small, one-seeded fruitlets that are part of a larger fruit structure. This description fits the concept of mericarps, which are individual one-seeded segments of a schizocarpic fruit. A schizocarpic fruit splits into one-seeded units called mericarps at maturity, as seen in plants like those in the Apiaceae family (e.g., fennel or coriander). The term "schizocarpic" in List III directly relates to this type of fruit, describing the splitting nature of the fruit into mericarps. Therefore, "One seeded bits of fruits" matches with Mericarps (List II: II) and Schizocarpic (List III: iv). Match: A II iv. - B) Jack fruit Jack fruit (Artocarpus heterophyllus) is a large tropical fruit known for its multiple fruit structure. It is classified as a composite fruit (also called a multiple fruit), which develops from an entire inflorescence (a cluster of flowers). In jack fruit, the individual flowers of the inflorescence fuse together to form a single large fruit, with each flower contributing to the fleshy edible parts. The term "composite" in List II refers to this type of fruit, and "entire inflorescence" in List III describes the origin of such a fruit. Therefore, Jack fruit matches with Composite (List II: I) and Entire inflorescence (List III: iii). Match: B I iii. - C) Fleshy thalamus The thalamus (or receptacle) is the part of the flower that supports the floral organs. A "fleshy thalamus" indicates that this part becomes fleshy and forms a significant portion of the fruit. This is characteristic of a pome, a type of false fruit where the thalamus becomes fleshy and surrounds the true fruit (the core with seeds). Apples (Malus domestica) are a classic example of a pome, where the edible fleshy part is primarily the thalamus, and the true fruit is the central core containing the seeds. In List II, Apple (IV) represents this type of fruit, and in List III, Pome (i) is the corresponding classification. Therefore, Fleshy thalamus matches with Apple (List II: IV) and Pome (List III: i). Match: C IV i. - D) Fused pericarp & seed coat "Fused pericarp & seed coat" refers to a fruit where the pericarp (the fruit wall) and the seed coat are fused together, making them inseparable. This is a defining characteristic of a caryopsis, a type of dry fruit commonly seen in grasses. In a caryopsis, the seed coat fuses with the pericarp, forming a single grain. Rice (Oryza sativa) is a well-known example of a caryopsis, where the grain consists of the fused pericarp and seed coat enclosing the embryo and endosperm. Therefore, Fused pericarp & seed coat matches with Caryopsis (List II: III) and Rice (List III: ii). Match: D III ii. Now, let’s summarize the matches: - A) One seeded bits of fruits → Mericarps (II) → Schizocarpic (iv) - B) Jack fruit → Composite (I) → Entire inflorescence (iii) - C) Fleshy thalamus → Apple (IV) → Pome (i) - D) Fused pericarp & seed coat → Caryopsis (III) → Rice (ii) This gives us: A II iv, B I iii, C IV i, D III ii. Let’s evaluate the options: - Option 1: A IV iv, B III ii, C III ii, D IV i A (One seeded bits) is not Apple (IV). B (Jack fruit) is not Caryopsis (III). C (Fleshy thalamus) is not Caryopsis (III). D (Fused pericarp & seed coat) is not Apple (IV). This option is incorrect. - Option 2: A IV iv, B III i, C IV iii, D II ii A (One seeded bits) is not Apple (IV). B (Jack fruit) is not Caryopsis (III). C (Fleshy thalamus) matches Apple (IV) but not Entire inflorescence (iii). D (Fused pericarp & seed coat) is not Mericarps (II). This option is incorrect. - Option 3: A II iv, B I iii, C IV i, D III ii A (One seeded bits) matches Mericarps (II) and Schizocarpic (iv). B (Jack fruit) matches Composite (I) and Entire inflorescence (iii). C (Fleshy thalamus) matches Apple (IV) and Pome (i). D (Fused pericarp & seed coat) matches Caryopsis (III) and Rice (ii). This option is correct. - Option 4: A IV iv, B III ii, C III i, D IV ii A (One seeded bits) is not Apple (IV). B (Jack fruit) is not Caryopsis (III). C (Fleshy thalamus) is not Caryopsis (III). D (Fused pericarp & seed coat) is not Apple (IV). This option is incorrect. Therefore, the correct answer is (3) A II iv, B I iii, C IV i, D III ii, which corresponds to the matches we determined. Thus, the correct answer is A II iv, B I iii, C IV i, D III ii.

In monocot leaves, vascular bundles are arranged in parallel veins of approximately equal size, a feature known as parallel venation. This ensures uniform size and distribution of vascular bundles throughout the leaf.

In monocot stems, vascular bundles are scattered throughout the ground tissue and each is surrounded by a bundle sheath made up of sclerenchyma cells.

Statement I is incorrect because endodermis belongs to the cortex, not stele. Statement II is wrong since casparian strips occur in roots, not stems. Statement IV is incorrect as monocot stems have closed vascular bundles. Only statement III is correct.

Bi-collateral vascular bundles are those in which phloem is present on both sides of xylem. This type is commonly found in plants like Lycopersicon esculentum tomato and Withania somnifera ashwagandha.

Conjoint vascular bundles (with xylem and phloem together) are present in both dicot and monocot stems. However, other features like open vascular bundles and large pith are not shared.

Step 1: Analyze Statement A)
Statement A describes cell walls thickened with cellulose, hemicellulose, and pectin. This is characteristic of Collenchyma tissue. Collenchyma cells have unevenly thickened primary cell walls, providing support to young, growing parts of the plant, such as stems and petioles. Step 2: Analyze Statement B)
Statement B mentions cellulose walls that are polygonal and perform photosynthesis. This describes Parenchyma tissue. Parenchyma cells are typically isodiametric or polygonal, have thin primary cell walls made of cellulose, and are often involved in photosynthesis (e.g., palisade and spongy parenchyma in leaves), storage, and other metabolic functions. Step 3: Analyze Statement C)
Statement C refers to thickened and lignified cell walls with pits. This is a defining characteristic of Sclerenchyma tissue. Sclerenchyma cells have heavily thickened, lignified secondary cell walls, which make them rigid and provide mechanical support to mature parts of the plant. The pits are thin areas in the cell wall that allow for communication between cells. Sclerenchyma includes fibers and sclereids. The question asks for the tissue, and Sclerenchyma is the broader category that encompasses such cells. Step 4: Formulate the sequence and check options
Based on the analysis from Steps 1, 2, and 3, the correct sequence matching statements A, B, and C respectively is:
A Collenchyma
B Parenchyma
C Sclerenchyma
Thus, the sequence is Collenchyma, Parenchyma, Sclerenchyma. Comparing this with the given options:
% Option (1) Parenchyma, Sclerenchyma, Sclerides (Incorrect)
% Option (2) Sclerides, Sclerenchyma, Parenchyma (Incorrect)
% Option (3) Collenchyma, Parenchyma, Sclerenchyma (Matches our derived sequence)
% Option (4) Sclerenchyma, Parenchyma, Sclerides (Incorrect)
Therefore, Option (3) is the correct answer.

Step 1: Analyze Assertion (A)
Sieve tubes in angiosperms lack nuclei, and their functions are controlled by companion cells which maintain the pressure gradient — so this assertion is true. Step 2: Analyze Reason (R)
In gymnosperms, the phloem lacks sieve tubes and companion cells, instead having sieve cells and albuminous cells. Hence, this reason is also true. Step 3: Examine the explanation relationship
Although both statements are true independently, (R) explains a characteristic of gymnosperms, while (A) is about angiosperms. So, (R) is not the correct explanation for (A).

Step 1: Analyze Assertion (A)
The upper surface of a dicot leaf appears dark green due to densely packed palisade tissue, while the lower surface is light green due to loosely arranged spongy tissue — so (A) is true. Step 2: Analyze Reason (R)
Palisade tissue is actually present towards the adaxial (upper) side and spongy tissue towards the abaxial (lower) side. The reason statement is reversed, so it is false. Step 3: Examine the explanation relationship
Since (A) is true and (R) is false, the correct option is (3).

A) Mechanical support at young stem and leaf petiole — III: Collenchyma tissue provides flexibility and support in growing stems and petioles.

B) Cells in fruit walls of nuts — I: These are made of sclereids, a type of sclerenchyma, giving hardness to nuts.

C) Cells absent in primary phloem — IV: Bast fibers (sclerenchyma) appear in secondary phloem, not primary.

D) Endarch primary xylem — II: Found in stem vascular bundles where protoxylem is towards the center.

Thus, correct match: A-III, B-I, C-IV, D-II.