Morphology Of Flowering Plants

- A) Acacia: The leaf of Acacia is a phyllode, which is a flat, leaf-like structure. The petiole (leaf stalk) is absent, making this correct.
- B) Nepenthes: Nepenthes is an insectivorous plant that absorbs nitrogen from insects, making this correct.
- C) Hibiscus: Hibiscus has alternate leaves, so the statement "Two leaves at each node" is wrong because Hibiscus has one leaf at each node. Hence, this combination is incorrect.
- D) Neem: Neem has pinnately compound leaves where the leaflets are attached at common points along the rachis, making this correct.
Thus, the wrong combinations are C and D, so the correct answer is (2) C D.

Cassia flowers exhibit imbricate aestivation, where the petals overlap in a particular way. The flowers are zygomorphic, meaning they are bilaterally symmetrical. Additionally, the inflorescence in Cassia is a corymb, which means that the flower stalks are arranged in a flat or slightly convex shape, with the outer flowers blooming first.
Thus, the correct statement is "Imbricate aestivation, zygomorphic, corymb."

In carrot, flowers emerge from the same point on the peduncle (umbel). In coconut (Cocos), flowers are protected by a modified bract known as spathe. Achyranthes and Cassia do not match correctly with the given descriptions.

Dry dehiscent fruits generally split open at maturity to release seeds and are often multi-seeded. Hence, the assertion is false. Tridax fruit is correctly described as a cypsella with a pappus that aids in wind dispersal, so the reason is true.

Yucca gloriosa is known for having trimerous flowers, meaning that its flowers are arranged in groups of three. It has a superior ovary and trilocular structure with axile placentation. This characteristic is typical for certain monocot plants, and Yucca gloriosa fits this description.

Out of the five listed features, four are identification characters for Bryophyllum: Epiphyllous buds, Leaf notches, Adventitious roots, and Monochasial cyme. Whorled leaves are not a typical feature for Bryophyllum.

Step 1: Analyze Statement I)
Statement I says: "Hairy leaves in plants are associated with resistance to insect pest."
Hairy leaves (presence of trichomes) can indeed provide resistance to insect pests. For example, hairiness in cotton leaves provides resistance to jassids.
Therefore, Statement I is Correct. Step 2: Analyze Statement II)
Statement II says: "Solid stem of wheat rejects stem saw fly." In wheat, varieties with solid stems are known to resist the stem sawfly.
Therefore, Statement II is Correct. Step 3: Analyze Statement III)
Statement III says: "Smooth leaves and nector less cotton attracts bollworms."
In cotton, smooth-leaved and nectar-less varieties do not attract bollworms. Instead, they offer resistance to bollworms, as the absence of nectar and smooth surfaces makes it difficult for bollworms to feed or lay eggs. Therefore, the statement that they "attracts bollworms" is Incorrect. Step 4: Analyze Statement IV)
Statement IV says: "Resistance to maize stem borer is by low aspartic acid and high nitrogen and sugar."
Resistance to maize stem borer in maize is actually due to high aspartic acid, and low nitrogen and sugar content in the plant. These chemical characteristics make the plant less palatable or suitable for the borer.
Therefore, the statement is Incorrect. Step 5: Identify the incorrect statements
Based on the analysis:
Statement I is Correct.
Statement II is Correct.
Statement III is Incorrect.
Statement IV is Incorrect.
The question asks to choose the incorrect statements. The incorrect statements are III and IV. Step 6: Choose the correct option
The option that contains both III and IV is (3).

Twisted: Each petal overlaps the next in one consistent direction — not the case here.
Imbricate: Petals overlap each other, but the direction of overlap is irregular — matches the question.
Valvate: Margins do not overlap but just touch — incorrect.
Vexillary: One large petal overlaps two lateral ones, which in turn overlap the two innermost — specific to papilionaceous corolla.

A. Velamen roots are characteristic of epiphytic orchids like {Vanda}, not Pisum – so incorrect if matched with III.
B. Axillary buds develop into tendrils in watermelon – B matches I.
C. In {Agave}, floral buds act as a storage organ – C matches IV.
D. In {Eichhornia}, the swollen petiole aids buoyancy – D matches II.

Statement I:
Correct. Suckers are indeed underground stems that grow horizontally beneath the soil and then give rise to aerial shoots. Example: Mint. Statement II:
Incorrect. Though the petiole helps in leaf attachment, its main function is to expose the lamina to light efficiently for photosynthesis, not merely attachment. Statement III:
Incorrect. Alstonia exhibits whorled phyllotaxy, not opposite. Statement IV:
Correct. In Pisum sativum (pea plant), the terminal leaflets are modified into tendrils to help in climbing.