Morphology of Flowering Plants
Class 11 · Biology
5 ideas in Class 11 Biology, explained in plain words, with games and quizzes to practise.
Root System
Part of: Roots and Shoots
Radicles grow tap systems like mustard; stem bases launch fibrous clusters like wheat; other parts sprout adventitious props like banyan. Tips run cap, division, elongation and maturation zones where hairs drink. Roots anchor, absorb, store and brew growth regulators.
Why it matters. Root origin predicts the whole system. Tip zones map where growth happens.
Key words
- Tap root
- : The main root growing from the seed radicle with lateral branches, as in mustard.
- Fibrous roots
- : A cluster of thin roots arising from the stem base, as in wheat.
- Adventitious roots
- : Roots arising from parts other than the radicle, such as banyan props.
- Root cap
- : The protective covering over the growing root tip as it pushes through soil.
- Root hairs
- : Fine outgrowths of the maturation zone that absorb water and minerals.
Try it in two minutes
- Sort three roots by origin.
- Order four tip zones.
- Name four root jobs.
Try at home. Compare mustard and wheat roots in soil.
Stem and Leaf
Part of: Roots and Shoots
Stems climb with nodes, buds and branches, piping supplies and storing extras. Leaves join by base, petiole and blade; veins net in dicots and run parallel in monocots; blades stay simple or split without leaflet buds; leaves alternate, oppose or whorl around stems.
Why it matters. Bud position separates simple from compound. Veins and arrangement name plant groups.
Key words
- Node
- : The point on a stem where leaves or branches arise.
- Internode
- : The stem segment between two successive nodes.
- Petiole
- : The stalk that joins the leaf blade to the stem.
- Lamina
- : The flat green blade of a leaf where most food is made.
- Venation
- : The pattern of veins in a leaf blade, net-like in dicots and parallel in monocots.
- Phyllotaxy
- : The arrangement of leaves on a stem, such as alternate, opposite or whorled.
Try it in two minutes
- Split stem from root by markers.
- Test a leaf for compound buds.
- Name three phyllotaxies with examples.
Try at home. Sort garden leaves by veins and arrangement.
Inflorescence and Flower
Part of: Flowers
Flower clusters stay open with lateral blooms in racemes or cap with a terminal bloom in cymes, youngest shifting top versus base. Four whorls ring the thalamus; blooms split in any plane, one plane or none; ovaries sit top, middle or sunken with unlike examples.
Why it matters. Axis fate names the cluster. Ovary position predicts fruit structure.
Key words
- Inflorescence
- : The arrangement of flowers on the floral axis of a plant.
- Racemose
- : An open flower cluster whose axis keeps growing, with younger blooms toward the top.
- Cymose
- : A closed flower cluster ending in a terminal bloom, with the oldest bloom at the top.
- Actinomorphic
- : A flower divisible into equal halves in any plane through the centre.
- Zygomorphic
- : A flower divisible into equal halves in only one plane through the centre.
- Thalamus
- : The swollen flower-stalk tip on which the four floral whorls sit.
Try it in two minutes
- Sort two clusters by axis fate.
- Split three symmetry types.
- Place three ovaries with examples.
Try at home. Find raceme and cyme blooms in a garden.
Flower Parts in Detail
Part of: Flowers
Sepal and petal edges merely touch, twist, overlap randomly or stack standard-wings-keel. Stamen bundles run one, two or many; lotus frees carpels while mustard fuses them; ovules ridge, axle, wall, centre or base their placentas.
Why it matters. Edge patterns identify families. Bundle and fusion counts decode floral formulas.
Key words
- Aestivation
- : The arrangement of sepals or petals in a bud, such as valvate, twisted or overlapping.
- Androecium
- : The male part of a flower, made of all its stamens.
- Gynoecium
- : The female part of a flower, made of one or more carpels.
- Placentation
- : The arrangement of ovules on the placenta inside the ovary.
- Syncarpous
- : A gynoecium whose carpels are fused together, as in mustard.
- Apocarpous
- : A gynoecium whose carpels stay free from each other, as in lotus.
Try it in two minutes
- Match four edge patterns.
- Count three bundle types.
- Place five placentas.
Try at home. Open china rose and pea blooms to compare edges.
Fruit, Seed and Families
Part of: Fruits, Seeds and Families
Fleshy fruits layer epicarp, mesocarp and endocarp; mango flesh contrasts coconut fibre in one-seeded drupes. Seeds coat an embryo of radicle, axis and cotyledons, with or without endosperm; maize shields scutellum, coleoptile and coleorhiza. Floral symbols compress plants; potato family unites petals with epipetalous stamens and axile ovaries.
Why it matters. Wall layers explain mango versus coconut. Seed maps predict germination parts.
Key words
- Pericarp
- : The wall of a fruit, often layered into epicarp, mesocarp and endocarp.
- Drupe
- : A fleshy one-seeded fruit like mango with a hard inner endocarp.
- Endosperm
- : The stored food tissue in a seed that feeds the growing embryo.
- Cotyledon
- : A seed leaf of the embryo that stores or absorbs food for germination.
- Floral formula
- : A symbolic shorthand showing the symmetry, whorls and fusion of a flower.
Try it in two minutes
- Layer a drupe's three walls.
- Map dicot versus monocot seeds.
- Read the mustard formula.
Try at home. Crack mango and coconut to compare walls.
What your child will practise
- Flower Parts in Detail: Space Quick Fire (Quick Fire)
- Fruit, Seed and Families: Ocean Puzzle (Clue Puzzle)
- Inflorescence and Flower: Space Quest (Flip and Match)
- Root System: Candy Quick Fire (Quick Fire)
- Stem and Leaf: Desert Puzzle (Clue Puzzle)
- Quiz: Flower Parts in Detail (8 questions)
- Quiz: Fruit, Seed and Families (8 questions)
- Quiz: Inflorescence and Flower (8 questions)
- Quiz: Root System (8 questions)