Assertion (A): In Calotropis, the aestivation of sepals or petals is valvate. Reason (R): In valvate aestivation, sepals or petals in a whorl overlap one another at the margin in a specific direction.
Calotropis exhibits valvate aestivation. In valvate aestivation, the sepals or petals merely touch one another at their margins without overlapping. Therefore, the Reason is false.
Question 282 of 300
📘 CLASS XI
Assertion (A): China rose, lady’s finger, and cotton exhibit twisted aestivation. Reason (R): In twisted aestivation, one margin of an appendage overlaps that of the next one, and so on.
China rose, lady’s finger, and cotton possess twisted aestivation in which one margin of each sepal or petal overlaps the next in a regular sequence. Therefore, the Reason correctly explains the Assertion.
Question 283 of 300
📘 CLASS XI
Assertion (A): In Cassia and gulmohur, the aestivation is described as imbricate. Reason (R): In these flowers, the margins of sepals or petals overlap one another, but not in any particular direction.
Cassia and gulmohur show imbricate aestivation in which the margins of sepals or petals overlap without following any fixed direction. Thus, the Reason correctly explains the Assertion.
Question 284 of 300
📘 CLASS XI
Assertion (A): Vexillary aestivation is also known as papilionaceous aestivation. Reason (R): Vexillary aestivation is characterized by a whorl of five petals where the largest (standard) overlaps two lateral petals (wings), which in turn overlap the two smallest anterior petals (keel).
Vexillary aestivation, also called papilionaceous aestivation, consists of a large standard petal overlapping two wings, which in turn overlap the two keel petals. This arrangement defines vexillary aestivation, so the Reason correctly explains the Assertion.
Question 285 of 300
📘 CLASS XI
Assertion (A): In brinjal flowers, the stamens are epipetalous. Reason (R): Epipetalous stamens are those that remain free from each other but are attached to the petals.
In brinjal, the stamens are epipetalous. Epipetalous means the stamens are attached to the petals. Therefore, the Reason correctly explains the Assertion.
Question 286 of 300
📘 CLASS XI
Assertion (A): Pea flowers are described as diadelphous. Reason (R): In pea, the stamens are united into two bundles.
Pea flowers are diadelphous because their stamens are united into two bundles. Hence, the Reason correctly explains the Assertion.
Question 287 of 300
📘 CLASS XI
Assertion (A): Salvia and mustard exhibit variation in the length of stamen filaments within a single flower. Reason (R): Salvia and mustard belong to the family Solanaceae, which is characterized by stamens of unequal lengths.
Variation in filament length occurs in Salvia and mustard. However, neither Salvia nor mustard belongs to the family Solanaceae. Therefore, the Reason is false.
Question 288 of 300
📘 CLASS XI
Assertion (A): Lotus and rose are described as apocarpous flowers. Reason (R): In lotus and rose, the gynoecium contains more than one carpel, and these carpels are completely fused with each other.
Lotus and rose possess apocarpous gynoecia in which the carpels remain free. The Reason is false because fused carpels are termed syncarpous.
Question 289 of 300
📘 CLASS XI
Assertion (A): Mustard and Argemone exhibit parietal placentation. Reason (R): In parietal placentation, the ovary is initially one-chambered but becomes two-chambered due to the formation of a false septum.
Mustard and Argemone exhibit parietal placentation. In this type of placentation, the ovary is initially unilocular but becomes bilocular because of the formation of a false septum. Hence, the Reason correctly explains the Assertion.
Question 290 of 300
📘 CLASS XI
Assertion (A): In Dianthus and Primrose, the placentation is free central. Reason (R): In free central placentation, the ovules are borne on a central axis, and partitioning septa are completely absent.
Free central placentation is characterized by ovules borne on a central axis without septa. Dianthus and Primrose are standard examples. Therefore, the Reason correctly explains the Assertion.
