14 public questions tagged with this topic.
Aestivation refers to the mode of arrangement of sepals or petals in a floral bud, which can be valvate, twisted, imbricate, or vexillary. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
In some flowers like lily, the calyx and corolla are not distinct and are collectively called the perianth. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
Perfect flower also termed hermaphroditic or bisexual contains both functional androecium with stamens producing pollen and gynoecium with carpels producing ovules within same receptacle irrespective of presence or absence of perianth whorls sepals and petals. Such flowers possess both male and female reproductive organs capable of self-pollination or outcrossing regulated by dichogamy, herkogamy, and self-incompatibility systems distinguishing sporophytic versus gametophytic control. Perfect condition distinguishes from imperfect unisexual flowers in monoecious or dioecious species where separate staminate and carpellate flowers evolve to increase outcrossing rates and genetic diversity.
Ref: Mauseth, Botany: perfect flower contains both male androecium and female gynoecium within same flower.
In some flowers like lily, the calyx and corolla are not distinct and are collectively called the perianth.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
In hypogynous flowers, the ovary is superior and occupies the highest position, as seen in mustard.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
The ovary matures into a fruit, while the ovules develop into seeds after fertilization.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
In free central placentation, as seen in Dianthus, ovules are attached to a central axis, and the ovary lacks septa.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
In hypogynous flowers, such as mustard, the ovary is superior and occupies the highest position on the thalamus.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
Bisexual flowers have both male (androecium) and female (gynoecium) reproductive organs.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
The anther is part of the stamen and is responsible for producing pollen grains.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
When perianth segments are indistinguishable in colour, texture and shape, each segment termed tepal to avoid mischaracterization as sepal or petal; collectively they form perigonium or perigone. Perianth remains general term for outer whorls ensemble, perigone sometimes used synonymously but strictly means true perigonium in lilioid monocots. Bracteoles are small bracts borne on pedicel, not perianth parts. Tepals occur prominently in Liliaceae, Palmae, Amaryllidaceae usually six arranged in two whorls 3+3 with petaloid colouration and valvate aestivation. Tepal terminology emphasizes homochlamydeous condition considered primitive within monocotyledons.
Ref: NCERT Class 11, Tepal terminology Liliaceae; Simpson, Plant Systematics, perigonium monocots
Epipetalous condition refers to stamens whose filaments are adnate to corolla tube, anthers remain free and introrse, ensuring pollen presentation near pollinator entry. This synorganization promotes effective nototribic and sternotribic pollination. Solanaceae displays five epipetalous, polyandrous stamens alternating with corolla lobes, valvate aestivation, superior ovary with swollen placenta. Fabaceae shows diadelphous condition not epipetalous, Malvaceae monadelphous staminal column, Brassicaceae tetradynamous free from petals. Presence of epipetalous stamens diagnostically identifies gamopetalous families evolved for specialized entomophily and buzz pollination in Solanum.
Ref: Campbell Biology, 12th ed., Chapter 38: Angiosperm Reproduction, Epipetalous androecium in Solanaceae
