In vexillary aestivation, there are five petals with a highly specific arrangement. Which of the following represents the correct outer-to-inner arrangement of these petals?
In vexillary aestivation, the largest posterior petal (standard) overlaps the two lateral petals (wings), which in turn overlap the two smallest anterior petals (keel).
Question 192 of 300
📘 CLASS XI
What is the protective function of the calyx in the life cycle of a flower?
The calyx is the outermost floral whorl, and its green leaf-like sepals protect the delicate floral organs during the bud stage.
Question 193 of 300
📘 CLASS XI
Which of the following sets of terms correctly matches the fusion of stamens with other floral whorls? 1. Epipetalous — Stamens attached to petals (e.g., brinjal). 2. Epiphyllous — Stamens attached to perianth (e.g., lily). 3. Polyandrous — Stamens remain free.
Select the correct option:
All three descriptions are correct. Epipetalous stamens occur in brinjal, epiphyllous stamens occur in lily, and polyandrous refers to free stamens.
Question 194 of 300
📘 CLASS XI
A student examines a flower and finds that the stamens are united into two distinct bundles (diadelphous condition). Which of the following plants displays this condition?
Diadelphous stamens, where stamens are united into two bundles, are characteristic of pea. China rose is monoadelphous, citrus is polyadelphous, and brinjal has free epipetalous stamens.
Question 195 of 300
📘 CLASS XI
Why is the presence of a "false septum" in mustard and Argemone considered a key diagnostic trait for their classification?
In parietal placentation, as seen in mustard and Argemone, the ovary is initially one-chambered but becomes two-chambered due to the formation of a false septum (replum).
Question 196 of 300
📘 CLASS XI
Match the following placentation types with their respective descriptions and examples: 1. Marginal — Placenta forms a ridge along ventral suture; ovules in two rows (e.g., Pea). 2. Axile — Placenta is axial; ovules attached in a multilocular ovary (e.g., China rose, Tomato, Lemon). 3. Basal — Placenta develops at the base of the ovary; a single ovule is attached (e.g., Sunflower, Marigold).
Select the correct option:
All three descriptions and examples represent the exact textbook definitions and diagnostic examples for marginal, axile, and basal placentation.
Question 197 of 300
📘 CLASS XI
What is the structural difference between the mesocarp of a mango and the mesocarp of a coconut, although both fruits are drupes?
In mango, the pericarp is differentiated into a thin outer epicarp, a middle fleshy edible mesocarp, and an inner stony hard endocarp. In coconut, the mesocarp is fibrous.
Question 198 of 300
📘 CLASS XI
In a monocotyledonous seed, what are the names of the large, shield-shaped cotyledon, and the protective sheaths of the plumule and radicle, respectively?
The single large, shield-shaped cotyledon of monocots is the scutellum. The plumule is enclosed in a sheath called the coleoptile, and the radicle is enclosed in a sheath called the coleorhiza.
Question 199 of 300
📘 CLASS XI
In the Solanaceae family, which of the following vegetative and floral characters is NOT correct?
In the Solanaceae family, the gynoecium is bicarpellary, syncarpous, with a superior ovary that is bilocular with a swollen placenta and many ovules, not apocarpous or inferior.
Question 200 of 300
📘 CLASS XI
Why is the economic importance of the Solanaceae family considered highly diverse?
The Solanaceae family is of immense economic importance, providing food (tomato, brinjal, potato), spices (chilli), medicine (belladonna, ashwagandha), fumigatory products (tobacco), and ornamentals (petunia). Cereal grains belong to the Poaceae family.
