Morphology of Flowering PlantsNEET MCQs with solutions

Not quite — the answer is C.

Rhizobium is the symbiotic nitrogen-fixing bacterium housed in legume root nodules, converting atmospheric N₂ to ammonia usable by the plant. Azotobacter is a free-living nitrogen fixer (not symbiotic in nodules). Rhizopus is a fungus — a common distractor used to test recall precision.

Not quite — the answer is C.

Stilt roots in maize and sugarcane arise from lower stem nodes and grow obliquely downward, anchoring the tall stem mechanically. Pneumatophores (Rhizophora) grow upward for gas exchange — the opposite direction. The oblique downward growth for support is the NEET-level diagnostic feature of stilt roots.

Not quite — the answer is C.

Pneumatophores grow vertically upward (negatively geotropic) above the waterlogged soil surface to access atmospheric oxygen, which cannot diffuse through anaerobic marsh soil. Stilt roots grow obliquely downward — the opposite direction — for mechanical support. Confusing the growth direction of pneumatophores with stilt roots is the most common NEET-level error in this sub-topic.

Not quite — the answer is C.

The onion bulb stores food in concentric fleshy scale leaves. The stem is reduced to a short, disc-like structure from which adventitious roots arise; it does not store food itself.

Not quite — the answer is B.

Runner (e.g., Cynodon, Oxalis) is a long, slender, prostrate stem growing on the soil surface, rooting at nodes to form new plants. Stolon is similar but grows underground or at an angle; offset is short and thick, typical of aquatic rosette plants.

Not quite — the answer is C.

Cladode (e.g., Asparagus) is a modified stem of a single internode — green and photosynthetic but of limited growth. Phylloclade (e.g., Opuntia) consists of multiple flattened, leaf-like stem segments with unlimited growth potential.

Not quite — the answer is C.

Whorled phyllotaxy means more than two leaves arise at the same node — as in Alstonia. This is independent of whether leaves are simple or compound; the phyllotaxy describes arrangement, not leaf type.

Not quite — the answer is C.

In a compound leaf, the lamina is completely divided — incisions reach all the way to the midrib (pinnate) or the petiole base (palmate) — forming distinct leaflets. Simple leaves never have incisions reaching the midrib.

Not quite — the answer is C.

Parallel venation is classified as unicostate parallel (single midrib, veins running parallel to it) and multicostate parallel (several veins from base). In all types, veins do not anastomose to form a network — that defines reticulate venation.

Not quite — the answer is D.

Capitulum is the inflorescence of family Asteraceae — sunflower is the classic NCERT example with many sessile florets on a flattened receptacle. Onion (Option D) shows umbel — a common confusion.

Not quite — the answer is B.

In dichasial cyme, exactly two lateral branches arise symmetrically below each terminal flower. One branch = monochasial (Option A), the primary distractor.

Not quite — the answer is D.

Definite growth occurs because the apical meristem converts to a floral meristem — the axis literally ends in a flower. Option B (lateral suppression) is a tempting mechanistic trap but is incorrect; the cause is meristematic differentiation.

Not quite — the answer is A.

Epipetalous = stamens adnate (adhering) to petals — example: brinjal (Solanum melongena). This is an adhesion condition. Stamens attached to perianth (tepals) = epiphyllous, seen in Liliaceae.

Not quite — the answer is B.

Microsporangia are housed within the thecae of the anther; they undergo meiosis to ultimately produce pollen grains (microspores). Ovules are produced in the ovary of the gynoecium — a critical distinction.

Not quite — the answer is C.

Brinjal has epipetalous stamens (adhesion to petals) and poricidal anther dehiscence (pores at tip). This dual-feature question is a high-frequency NEET trap — students who know only one feature choose D.

Not quite — the answer is D.

Multiple (composite) fruits such as pineapple and mulberry develop from an entire inflorescence, where flowers fuse together along with other floral parts. This distinguishes them from aggregate fruits (single apocarpous flower) and simple fruits (single ovary).

Not quite — the answer is B.

Silique is the diagnostic fruit of Brassicaceae (mustard family), formed from a bicarpellary syncarpous ovary with a persistent replum after dehiscence. Fabaceae produces legumes; Solanaceae produces berries. Family-to-fruit matching is a frequent NEET question pattern.

Not quite — the answer is D.

Capsule arises from a syncarpous (fused carpel) ovary and can dehisce in multiple ways — loculicidal (through locule wall), septicidal (through septa), or poricidal. Option B describes a follicle; Option C describes an achene/caryopsis. The syncarpous origin is the key distinguishing fact.

Not quite — the answer is D.

In non-albuminous seeds, endosperm is consumed during embryogenesis and food reserves are sequestered in the enlarged, fleshy cotyledons. Testa and tegmen are protective layers with no significant storage function.

Not quite — the answer is D.

Albuminous (endospermic) seeds retain the endosperm as the principal food reserve at maturity (e.g., castor, maize, wheat). Non-albuminous and exalbuminous are synonymous terms for seeds where endosperm is consumed — Option D is a trap synonym for Option B.

Not quite — the answer is D.

Castor (Ricinus communis) is a dicot that retains endosperm at seed maturity — making it albuminous. This is the critical exception: most dicots are non-albuminous, but castor is not. Option C (perisperm) is a trap — castor has endosperm, not perisperm. Option A is factually wrong.

Not quite — the answer is B.

Solanaceae shows gamosepalous calyx (K(5)) with five fused sepals represented in floral diagrams as a continuous ring. Four sepals in cross arrangement describes Brassicaceae (cruciform calyx), a common distractor.

Not quite — the answer is C.

In cymose inflorescence, the main axis terminates in a flower, preventing further apical extension — growth continues through lateral axes. Racemose inflorescence (Option B) has unlimited apical growth, not terminal flowers — a common reversal trap.

Not quite — the answer is C.

Epipetalous = stamens attached to petals; specifically, filaments fuse with the gamopetalous corolla tube. Option D describes monadelphous condition (as in Hibiscus). Option A describes syngenesious androecium (as in Asteraceae).