Botany and Plant Science

This is the correct option. Gourd is a unisexual flower.

This is the correct option.

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This is the correct option.

It is the part of the stem in between two successive nodes.

A bracteole (also called a bractlet) is a small bract-like structure that may be present on the pedicel (the stalk of a single flower). A bract is a leaf-like structure at the base of an inflorescence, not on the pedicel itself. Leaf base is part of the leaf, and epicalyx is a whorl of bracts below the calyx.

A bract is a modified leaf or scale, typically small, with a flower or inflorescence arising in its axil. Bracts are often mistaken for petals but are actually modified leaves. Leaf base is part of the leaf itself, bracteole is on the pedicel, and epicalyx refers to supplementary whorls below the calyx.

A neuter flower lacks both stamens (male part) and pistils (female part), making it non-reproductive. Examples include flowers of ray florets in sunflower. Neither pistillode (non-functional pistil) nor staminodes (non-functional stamens) fully describes the absence of both whorls.

Monoecious means 'one house' - both male and female flowers are on the same plant, like corn or cucumber. Dioecious plants have separate male and female plants (like papaya or date palm). Naked flowers lack perianth altogether.

A unisexual flower lacks either the androecium (male whorl) or gynoecium (female whorl), not both. Androecium is the correct term for the male reproductive whorl (stamens). Pistillate refers to female flowers, gynoecium is the female part, and perianth is the protective whorl.

When sepals and petals are indistinguishable, individual perianth units are called tepals (as in tulips and lilies). This contrasts with flowers having distinct calyx (sepals) and corolla (petals). Monoecious and dioecious describe plant sexuality, not perianth parts.

Perianth is the collective term for the outer protective whorl when sepals and petals cannot be distinguished. Monoecious and dioecious describe sexual arrangements of flowers on plants. Naked flowers lack a perianth entirely.

Sepalloid perianth is green and resembles calyx (sepals). Petalloid perianth is colorful like petals. The question describes a green, calyx-like appearance, so sepalloid is correct. Monoecious and dioecious are plant sexuality terms.

Actinomorphic (regular) flowers can be divided into two equal halves by ANY vertical plane passing through the center, showing radial symmetry. Examples: mustard, datura. Zygomorphic flowers can only be divided along one plane. Asymmetrical flowers have no symmetry.

Zygomorphic flowers have bilateral symmetry - they can be divided into two similar halves along only ONE specific vertical plane. Examples: orchid, pea, snapdragon. Actinomorphic flowers can be divided along any plane. Asymmetrical flowers lack symmetry.