Important Questions Class 11 Biology Chapter 5 Morphology of Flowering Plants With Answers

Morphology studies the external form, structure, and arrangement of plant organs.
Roots, stems, leaves, flowers, fruits, and seeds show plant adaptations and classification features.

Plant morphology becomes easier when students treat every organ as a clue for identification. Important Questions Class 11 Biology Chapter 5 help students revise Morphology of Flowering Plants for CBSE 2026-27 school exams, NEET foundation practice, and NCERT-based state board tests. Chapter 5 explains root systems, stem features, leaf types, phyllotaxy, inflorescence, flower structure, aestivation, placentation, fruits, seeds, floral formula, floral diagram, and Solanaceae. These topics often appear as labelled diagrams, differences, definitions, examples, and semi-technical plant descriptions.

Key Takeaways

• Root Systems: Tap roots occur in most dicots, while fibrous roots occur in most monocots.
• Leaf Characters: Reticulate venation is common in dicots, while parallel venation is common in monocots.
• Flower Position: Hypogynous flowers have superior ovary, while epigynous flowers have inferior ovary.
• Solanaceae: Tomato, brinjal, potato, chilli, tobacco, petunia, belladonna, and ashwagandha belong to this family.

Important Questions Class 11 Biology Chapter 5 Structure 2026-27

Important Questions Class 11 Biology Chapter 5 for CBSE 2026-27

Students often confuse terms because this chapter has many similar-looking definitions. Strong answers use the organ name, its feature, and one NCERT example.

1. What is morphology in Class 11 Biology?

Morphology is the study of external form and structure of organisms. In flowering plants, it studies root, stem, leaf, flower, fruit, and seed.

1. It helps identify plants.
2. It helps compare plant parts.
3. It supports classification.

Final answer:
Morphology studies external plant structure.

2. What are the main parts of a flowering plant?

A flowering plant has root system and shoot system. The root system is underground, while the shoot system remains above the ground.

1. Root system includes primary and lateral roots.
2. Shoot system includes stem, leaves, buds, flowers, and fruits.
3. Flowers and fruits belong to the reproductive part.

Final fact:
Angiosperms have roots, stems, leaves, flowers, and fruits.

3. Why is morphology important in plant classification?

Morphology is important because visible plant characters help identify and classify flowering plants.

1. Root type helps compare plant groups.
2. Leaf venation helps distinguish dicots and monocots.
3. Floral characters help describe families.
4. Fruit and seed characters support identification.

Final fact:
Floral features form a major basis of plant classification.

Morphology of Flowering Plants Class 11 Biology Important Questions on Root System

The root anchors the plant and absorbs water and minerals. CBSE 2026-27 questions often ask root types, root regions, root hairs, and examples from mustard, wheat, grass, Monstera, and banyan.

4. What is root system Class 11 Biology?

Root system is the underground part of the flowering plant. It develops mainly from the radicle in many plants.

1. It absorbs water and minerals.
2. It anchors the plant.
3. It may store food.
4. It may synthesise plant growth regulators.

Final answer:
Root system supports absorption, anchorage, storage, and growth regulation.

5. What is tap root system?

Tap root system has a primary root and its lateral branches. It usually occurs in dicotyledonous plants.

1. The radicle elongates directly.
2. It forms the primary root.
3. Secondary and tertiary roots arise from it.
4. The complete system forms tap root system.

Example:
Mustard plant

Final fact:
Tap root system is common in dicots.

6. What is fibrous root system?

Fibrous root system has many roots that arise from the base of the stem. It usually occurs in monocotyledonous plants.

1. The primary root is short-lived.
2. Many roots replace it.
3. These roots arise from stem base.

Example:
Wheat plant

Final fact:
Fibrous root system is common in monocots.

7. What are adventitious roots?

Adventitious roots arise from plant parts other than the radicle.

Examples:

1. Grass.
2. Monstera.
3. Banyan tree.
4. These roots may arise from stem or other parts.
5. They can support, absorb, or anchor the plant.

Final answer:
Adventitious roots do not develop from the radicle.

8. What are the main functions of roots?

Roots absorb water and minerals, anchor the plant, store food, and synthesise plant growth regulators.

Functions:

1. Absorption of water.
2. Absorption of minerals.
3. Anchorage to soil.
4. Storage of reserve food.
5. Synthesis of plant growth regulators.

Final fact:
Roots support both nutrition and plant stability.

9. Name the regions of the root tip.

The root tip has root cap, region of meristematic activity, region of elongation, and region of maturation.

Regions:

1. Root cap.
2. Region of meristematic activity.
3. Region of elongation.
4. Region of maturation.

Final fact:
Root hairs arise from the region of maturation.

10. What is the function of root cap?

Root cap protects the tender root apex as it pushes through soil.

1. It covers the root apex.
2. It has a thimble-like shape.
3. It prevents damage to the growing tip.

Final answer:
Root cap protects the root tip.

11. What are root hairs?

Root hairs are fine thread-like structures formed by some epidermal cells in the region of maturation.

1. They increase surface area.
2. They absorb water from soil.
3. They absorb mineral salts.

Final fact:
Root hairs are delicate absorbing structures.

Stem Morphology Class 11 Biology Questions

The stem carries nodes, internodes, buds, leaves, flowers, and fruits. These features help distinguish stems from roots in practical exams and diagrams.

12. What is stem in flowering plants?

Stem is the ascending part of the plant axis that bears branches, leaves, flowers, and fruits. It develops from the plumule.

1. It bears nodes.
2. It bears internodes.
3. It bears terminal and axillary buds.
4. Young stems are often green.

Final answer:
Stem forms the main axis of the shoot system.

13. What are nodes and internodes?

Nodes are stem regions where leaves arise, while internodes are stem portions between two nodes.

1. Leaves develop at nodes.
2. Buds may occur near nodes.
3. Internodes separate two nodes.

Final fact:
Nodes and internodes are key stem characters.

14. What are the main functions of stem?

Stem spreads branches and conducts water, minerals, and photosynthates.

Functions:

1. It supports leaves, flowers, and fruits.
2. It conducts water and minerals.
3. It conducts photosynthates.
4. It may store food.
5. It may help in support, protection, and vegetative propagation.

Final fact:
Some stems perform storage and propagation functions.

15. How is stem different from root?

Stem bears nodes, internodes, buds, leaves, flowers, and fruits, while root lacks nodes and internodes.

Final fact:
Nodes and internodes help identify stems.

Leaf Venation Class 11 Biology and Types of Leaves

Leaves are the main photosynthetic organs of flowering plants. Exam questions usually ask leaf parts, venation, simple leaves, compound leaves, and phyllotaxy.

16. What are the three main parts of a typical leaf?

A typical leaf has leaf base, petiole, and lamina.

1. Leaf base attaches the leaf to the stem.
2. Petiole holds the leaf blade to light.
3. Lamina is the green expanded part.
4. Lamina contains veins and veinlets.

Final fact:
The midrib is the prominent middle vein in the lamina.

17. What is leaf base?

Leaf base is the part by which the leaf attaches to the stem. It may bear stipules in some plants.

1. In monocots, the leaf base may form a sheath.
2. In some legumes, it becomes swollen.
3. The swollen leaf base is called pulvinus.

Final fact:
Pulvinus occurs in some leguminous plants.

18. What is the function of petiole?

Petiole helps hold the leaf blade to light. It also allows the lamina to flutter in wind.

1. It supports the lamina.
2. It helps expose lamina to sunlight.
3. Flexible petioles cool the leaf surface.
4. They bring fresh air to the leaf surface.

Final answer:
Petiole helps in light exposure and leaf cooling.

19. What is venation?

Venation is the arrangement of veins and veinlets in the leaf lamina.

Types:

1. Reticulate venation.
2. Parallel venation.

Final fact:
Venation helps distinguish many dicot and monocot leaves.

20. Differentiate between reticulate and parallel venation.

Reticulate venation forms a network, while parallel venation has veins running parallel to each other.

Final fact:
Dicots generally show reticulate venation.

21. What is a simple leaf?

A simple leaf has an entire lamina, or incisions that do not reach the midrib.

1. Lamina remains single.
2. Leaf blade is not divided into leaflets.
3. A bud occurs in the axil of the petiole.

Final answer:
A simple leaf has one undivided lamina.

22. What is a compound leaf?

A compound leaf has incisions that reach the midrib and divide the lamina into leaflets.

1. Leaflets arise from a common axis or point.
2. A bud occurs in the axil of the petiole.
3. A bud does not occur in the axil of leaflets.

Final fact:
Compound leaves may be pinnately or palmately compound.

23. How is pinnately compound leaf different from palmately compound leaf?

A pinnately compound leaf has leaflets on a common axis, while a palmately compound leaf has leaflets at one point.

Final fact:
Rachis is the common axis in pinnately compound leaves.

Phyllotaxy Class 11 Biology Questions

Phyllotaxy gives the arrangement of leaves on a stem or branch. It is easy to score if students remember one example for each type.

24. What is phyllotaxy?

Phyllotaxy is the pattern of arrangement of leaves on the stem or branch.

Types:

1. Alternate.
2. Opposite.
3. Whorled.

Final answer:
Phyllotaxy describes leaf arrangement.

25. Explain alternate phyllotaxy with examples.

Alternate phyllotaxy has one leaf at each node in an alternate manner.

Examples:

1. China rose.
2. Mustard.
3. Sunflower.

Final fact:
Only one leaf arises at each node.

26. Explain opposite phyllotaxy with examples.

Opposite phyllotaxy has a pair of leaves at each node. The two leaves lie opposite each other.

Examples:

1. Calotropis.
2. Guava.

Final fact:
Opposite phyllotaxy forms two leaves per node.

27. Explain whorled phyllotaxy with example.

Whorled phyllotaxy has more than two leaves at a node.

Example:
Alstonia

1. Several leaves arise from the same node.
2. The leaves form a whorl.

Final answer:
Alstonia shows whorled phyllotaxy.

Inflorescence Class 11 Biology Questions

Inflorescence depends on whether the main floral axis keeps growing or ends in a flower. This makes racemose and cymose easy to separate.

28. What is inflorescence?

Inflorescence is the arrangement of flowers on the floral axis.

1. A flower is a modified shoot.
2. The shoot apical meristem changes into floral meristem.
3. The axis becomes condensed.
4. Floral appendages form at successive nodes.

Final fact:
Inflorescence describes how flowers are arranged.

29. Differentiate between racemose and cymose inflorescence.

Racemose inflorescence has unlimited main axis growth, while cymose inflorescence has limited growth.

Final fact:
Racemose and cymose differ by the behaviour of the main axis.

Flower Morphology Class 11 Biology Questions

Flower questions carry high exam value because they connect symmetry, ovary position, floral whorls, aestivation, placentation, and floral formula. Use exact terms with examples.

30. What is a flower?

A flower is a modified shoot meant for sexual reproduction in angiosperms.

1. Internodes do not elongate.
2. The floral axis is condensed.
3. Floral appendages form in whorls.
4. The reproductive organs are androecium and gynoecium.

Final answer:
Flower is the reproductive unit of angiosperms.

31. Name the four whorls of a typical flower.

A typical flower has calyx, corolla, androecium, and gynoecium.

1. Calyx consists of sepals.
2. Corolla consists of petals.
3. Androecium consists of stamens.
4. Gynoecium consists of carpels.

Final fact:
Calyx and corolla are accessory organs.

32. What is the difference between bisexual and unisexual flowers?

Bisexual flowers have both androecium and gynoecium, while unisexual flowers have either stamens or carpels.

Final fact:
Androecium and gynoecium are reproductive organs.

33. What is actinomorphic flower?

An actinomorphic flower can be divided into two equal radial halves in any radial plane.

Examples:

1. Mustard.
2. Datura.
3. Chilli.

Final fact:
Actinomorphic flowers show radial symmetry.

34. What is zygomorphic flower?

A zygomorphic flower can be divided into two similar halves only in one vertical plane.

Examples:

1. Pea.
2. Gulmohur.
3. Bean.
4. Cassia.

Final fact:
Zygomorphic flowers show bilateral symmetry.

35. What is an asymmetric flower?

An asymmetric flower cannot be divided into two similar halves by any vertical plane.

Example:
Canna

Final answer:
Canna shows irregular floral symmetry.

36. What are hypogynous, perigynous, and epigynous flowers?

Hypogynous, perigynous, and epigynous flowers differ by the position of floral parts on the thalamus.

Final fact:
Ovary position is important in floral description.

Aestivation Class 11 Biology and Placentation Questions

Aestivation describes sepals or petals in the bud stage, while placentation describes ovule arrangement in the ovary. These terms are repeatedly asked in school exams.

37. What is aestivation?

Aestivation is the arrangement of sepals or petals in the floral bud with respect to members of the same whorl.

Types:

1. Valvate.
2. Twisted.
3. Imbricate.
4. Vexillary.

Final fact:
Aestivation describes floral bud arrangement.

38. Explain valvate aestivation with example.

Valvate aestivation occurs when sepals or petals just touch at margins without overlapping.

Example:
Calotropis

Final answer:
Valvate aestivation has no overlapping.

39. Explain twisted aestivation with examples.

Twisted aestivation occurs when one margin overlaps the next member in one direction.

Examples:

1. China rose.
2. Lady’s finger.
3. Cotton.

Final fact:
Twisted aestivation shows regular overlapping direction.

40. Explain imbricate aestivation with examples.

Imbricate aestivation occurs when margins overlap but not in a fixed direction.

Examples:

1. Cassia.
2. Gulmohur.

Final fact:
Imbricate aestivation lacks a fixed overlapping pattern.

41. What is vexillary aestivation?

Vexillary aestivation occurs when the largest standard petal overlaps two wings, which overlap two keel petals.

Examples:

1. Pea.
2. Bean.

Final fact:
Vexillary aestivation is also called papilionaceous aestivation.

42. What is placentation?

Placentation is the arrangement of ovules inside the ovary.

Types:

1. Marginal.
2. Axile.
3. Parietal.
4. Free central.
5. Basal.

Final answer:
Placentation describes ovule arrangement.

43. Describe different types of placentation with examples.

Different types of placentation are identified by the position of placenta and ovules inside the ovary.

1. Marginal: ovules occur along the ventral suture, as in pea.
2. Axile: ovules attach to central axis in multilocular ovary, as in china rose, tomato, and lemon.
3. Parietal: ovules develop on inner wall, as in mustard and Argemone.
4. Free central: ovules occur on central axis without septa, as in Dianthus and Primrose.
5. Basal: one ovule attaches at the base, as in sunflower and marigold.

Final fact:
Placentation is a key floral character.

Fruit and Seed Class 11 Biology Questions

Fruit develops from the ovary, and seed develops from the ovule. Diagram-based questions usually ask mango, coconut, gram seed, and maize seed.

44. What is fruit?

Fruit is a mature or ripened ovary formed after fertilisation.

1. Fruit is a feature of flowering plants.
2. It usually contains pericarp and seeds.
3. Pericarp may be dry or fleshy.

Final fact:
A fruit formed without fertilisation is called parthenocarpic fruit.

45. What is a drupe?

A drupe is a one-seeded fruit that develops from a monocarpellary superior ovary.

Examples:

1. Mango.
2. Coconut.

In mango:

1. Epicarp is thin.
2. Mesocarp is fleshy and edible.
3. Endocarp is stony and hard.

Final fact:
Coconut has fibrous mesocarp.

46. What is a seed?

A seed is a fertilised ovule that contains seed coat and embryo.

Parts:

1. Seed coat.
2. Embryo.
3. Cotyledons.
4. Radicle.
5. Plumule.

Final fact:
Seeds may be dicotyledonous or monocotyledonous.

47. Describe the structure of a dicot seed.

A dicot seed has two cotyledons, seed coat, embryonal axis, radicle, and plumule.

Parts:

1. Seed coat has outer testa and inner tegmen.
2. Hilum marks attachment to fruit.
3. Micropyle is a small pore above hilum.
4. Embryo has two cotyledons.
5. Radicle and plumule occur at two ends of the embryonal axis.

Final fact:
Gram and pea have non-endospermous dicot seeds.

48. Describe the structure of a monocot seed.

A monocot seed usually has one cotyledon and a bulky endosperm.

In maize seed:

1. Seed coat fuses with fruit wall.
2. Endosperm stores food.
3. Aleurone layer separates embryo from endosperm.
4. Scutellum is the large shield-shaped cotyledon.
5. Coleoptile covers the plumule.
6. Coleorhiza covers the radicle.

Final fact:
Cereal seeds such as maize are usually endospermic.

Floral Formula Class 11 Biology and Solanaceae Family Questions

Floral formula and family description need exact symbols and sequence. Students should revise bract, symmetry, sexuality, calyx, corolla, androecium, gynoecium, and ovary position together.

49. What is semi-technical description of a flowering plant?

Semi-technical description is a brief scientific description of a flowering plant in a fixed sequence.

Sequence:

1. Habit.
2. Vegetative characters.
3. Root.
4. Stem.
5. Leaf.
6. Inflorescence.
7. Flower.
8. Floral parts.
9. Floral diagram.
10. Floral formula.

Final fact:
Plant description uses standard botanical terms.

50. What is floral formula?

Floral formula is a symbolic representation of floral structure.

Common symbols:

1. Br = bracteate.
2. K = calyx.
3. C = corolla.
4. P = perianth.
5. A = androecium.
6. G = gynoecium.
7. ⊕ = actinomorphic.
8. % = zygomorphic.

Final fact:
Fusion is shown by brackets in floral formula.

51. What is floral diagram?

Floral diagram is a diagrammatic representation of floral parts, their number, arrangement, and relation.

1. Mother axis is shown by a dot.
2. Calyx forms the outermost whorl.
3. Corolla comes next.
4. Androecium follows corolla.
5. Gynoecium occupies the centre.

Final fact:
Floral diagram shows floral structure at a glance.

52. Write the floral formula of mustard.

The floral formula of mustard is ⊕ K2+2 C4 A2+4 G(2).

Meaning:

1. Flower is actinomorphic.
2. Calyx has four sepals in two whorls.
3. Corolla has four petals.
4. Androecium has six stamens.
5. Gynoecium is bicarpellary and syncarpous.

Final fact:
Mustard belongs to family Brassicaceae.

53. What are the vegetative characters of Solanaceae?

Solanaceae plants are mostly herbs, shrubs, and rarely small trees.

Stem characters:

1. Herbaceous or rarely woody.
2. Aerial.
3. Erect.
4. Cylindrical.
5. Branched.
6. Solid or hollow.
7. Hairy or glabrous.

Leaf characters:

1. Alternate.
2. Simple.
3. Rarely pinnately compound.
4. Exstipulate.
5. Reticulate venation.

Final fact:
Potato has underground stem in Solanaceae.

54. What are the floral characters of Solanaceae?

Solanaceae flowers are usually bisexual and actinomorphic.

Characters:

1. Inflorescence is solitary, axillary, or cymose.
2. Calyx has five united sepals.
3. Corolla has five united petals.
4. Stamens are five and epipetalous.
5. Gynoecium is bicarpellary and syncarpous.
6. Ovary is superior and bilocular.
7. Placentation is axile.

Final fact:
Fruit is berry or capsule in Solanaceae.

55. What is the economic importance of Solanaceae?

Solanaceae includes food, spice, medicinal, fumigatory, and ornamental plants.

Examples:

1. Food: tomato, brinjal, potato.
2. Spice: chilli.
3. Medicine: belladonna, ashwagandha.
4. Fumigatory plant: tobacco.
5. Ornamental plant: petunia.

Final fact:
Solanaceae is commonly called the potato family.

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