Buds are typically found

Question

UnlockIAS · Accepted Answer

Correct — B, Both at the base of leaves and tip of branches. A bud is a compressed, undeveloped shoot: a very short stem carrying a dome of meristematic tissue and a tight cluster of immature leaves, waiting to elongate. Plants place them in exactly two standard positions, and the question is built so that each of those positions is offered separately before the union of the two. The terminal or apical bud sits at the growing tip of the main stem and of every branch, and its meristem is what makes the shoot longer — primary growth. The axillary or lateral bud sits in the leaf axil, the angle between the upper surface of the leaf stalk and the stem, which is what 'at the base of leaves' describes; each leaf normally subtends one, and it is the reserve from which a new branch, or in due course a flower, develops. Because both positions are typical, options (a) and (c) are each true but incomplete, and the complete statement is their union. That structure is deliberate. When a paper offers X, Y and 'both X and Y', the union is correct whenever you can defend both halves separately — and here you can, since every twig you can pick up carries a bud at its tip and a bud in the angle of each leaf. Buds do occasionally appear elsewhere — adventitious buds form on roots and on leaf margins, as in Bryophyllum — but those are the exception, and the word 'typically' in the stem excludes them.

Why the other options are wrong — (a) True but only half of the answer. This describes the axillary bud, which lies in the leaf axil where the petiole meets the stem, and it is the correct position for the buds that become branches. It leaves out the terminal bud at the growing tip, which is the more important of the two because it drives the elongation of the shoot and, through apical dominance, controls whether the axillary buds are allowed to grow at all.  (c) Also true and also incomplete. This is the terminal or apical bud, one per stem and one per branch. Taking it alone leaves out the far more numerous axillary buds — a plant carries one at nearly every node — and it would make branching impossible to explain, since a new branch has to start from a bud that is not at the tip.  (d) A 'none of the above' option is correct only if you can show that each of the other three fails, and here one of them is fully correct. Since (b) states both standard positions and both are right, (d) is dead. It is worth applying that test explicitly on this paper, where the option is offered very often and functions mostly as a distractor for candidates who are unsure rather than as a genuine answer.

Concept: A bud is best understood as a shoot in miniature, packed and paused. It has a shoot apical meristem, the ring of dividing cells that produces all the stem and leaf tissue above it, wrapped in leaf primordia and often protected by scale leaves in the perennating buds of temperate trees. Buds are classified in three ways at once. By position: terminal or apical at the tip; axillary or lateral in the leaf axil; accessory where more than one sits at the same node; adventitious where a bud arises outside these positions altogether, on a root or a leaf margin. By contents: vegetative buds produce leaves and stem, floral buds produce flowers, mixed buds produce both. By activity: active or dormant, the latter waiting on a season or on the removal of some restraint. The restraint is usually apical dominance — auxin produced by the apical bud travels down the stem and suppresses the axillary buds below it, which is why an unpruned plant grows tall and spindly and a pruned one grows bushy. Remove the tip and you remove the source of the auxin, and the axillary buds break; that single fact is the basis of pruning, hedging, pinching in floriculture, and the plucking of tea.

State PCS 2025 Q94 — Science & Technology PYQ with Answer

State PCS 2025 Q94 — Science & Technology PYQ with Answer