Part-II Graduation Standard: MCQ — 399 Practice Questions with Answers

Explanation

Parthenocarpy is fruit development without fertilization. Because fertilization and seed formation are bypassed, parthenocarpic fruits are generally seedless; this trait may occur naturally or be induced by growth regulators.

Explanation

Annelids are the segmented worms; their body shows true metamerism and a coelomate plan. Nematodes may look worm-like, but they are unsegmented and pseudocoelomate. This contrast is a common trap because both groups include elongated worm forms but belong to different structural grades.

Explanation

The rate of transpiration depends strongly on the vapour gradient and stomatal aperture. Light tends to open stomata for photosynthetic gas exchange, so water vapour escapes faster than in darkness, while high humidity and stomatal closure have the opposite effect.

Explanation

Asteraceae is also called Compositae because many small florets are packed into a capitulum or head, commonly surrounded by involucral bracts. The androecium is syngenesious, and the fruit is a cypsela, often associated with a pappus. These features separate it sharply from Fabaceae, Malvaceae and Euphorbiaceae.

Explanation

Zinc is difficult to obtain as a metal because it vaporizes at furnace temperatures and can reoxidize. Indian zinc metallurgy is noted for using reduction-distillation arrangements with retorts and condensers, a practical chemical solution that distinguishes it from unrelated modern electrolysis or petroleum processes.