Important Questions Class 11 Biology Chapter 6 Anatomy of Flowering Plants With Answers

Plant anatomy is the study of the internal structure and functional organisation of plant parts.
Epidermis, ground tissue, xylem, phloem, roots, stems, and leaves show how plants support life processes.

Internal plant structure explains why roots absorb, stems conduct, and leaves photosynthesise. Important Questions Class 11 Biology Chapter 6 help students revise Anatomy of Flowering Plants for CBSE 2026-27 school exams, NEET foundation practice, and NCERT-based state board tests. The chapter focuses on tissue systems, stomata, trichomes, root hairs, ground tissue, vascular bundles, dicot root, monocot root, dicot stem, monocot stem, dorsiventral leaf, isobilateral leaf, and bulliform cells. These topics commonly appear as labelled diagrams, comparison tables, identification questions, and short-answer explanations.

Key Takeaways

• Three Tissue Systems: Epidermal, ground, and vascular tissue systems form the internal organisation of flowering plants.
• Vascular Bundles: Dicot stems have open vascular bundles, while monocot stems have closed vascular bundles.
• Root Anatomy: Dicot roots usually have two to four xylem patches, while monocot roots are usually polyarch.
• Leaf Anatomy: Dorsiventral leaves show palisade and spongy mesophyll, while isobilateral leaves lack this differentiation.

Important Questions Class 11 Biology Chapter 6 Structure 2026-27

Important Questions Class 11 Biology Chapter 6 for CBSE 2026-27

Students often find this chapter difficult because the same tissue names appear in roots, stems, and leaves. The safest method is to identify location, structure, and function together.

1. What is plant anatomy?

Plant anatomy is the study of the internal structure of plants. It explains how tissues are arranged inside roots, stems, and leaves.

1. Cells form tissues.
2. Tissues form tissue systems.
3. Tissue systems form organs.
4. Organs perform specific functions.

Final answer:
Plant anatomy studies internal plant organisation.

2. Why is the study of plant anatomy useful?

Plant anatomy helps understand internal structure, function, adaptation, and identification of plants.

1. It explains how roots absorb water.
2. It explains how stems conduct materials.
3. It explains how leaves carry out photosynthesis.
4. It shows anatomical differences between dicots and monocots.
5. It helps connect structure with function.

Final fact:
Internal structures show adaptations to different environments.

3. What are the three basic tissue systems in flowering plants?

The three basic tissue systems are epidermal tissue system, ground tissue system, and vascular tissue system.

1. Epidermal tissue system forms the outer covering.
2. Ground tissue system forms the main internal bulk.
3. Vascular tissue system conducts water, minerals, and food.

Final answer:
Flowering plants have epidermal, ground, and vascular tissue systems.

Anatomy of Flowering Plants Class 11 Biology Important Questions on Tissue Systems

Tissue systems organise plant tissues by location and function. CBSE 2026-27 questions usually ask their names, parts, and roles in the plant body.

4. What is a tissue system Class 11 Biology?

A tissue system is a group of tissues that work together in a plant body. Its structure and function depend on location.

1. Epidermal tissue system protects the plant.
2. Ground tissue system supports and stores materials.
3. Vascular tissue system conducts substances.

Final fact:
Tissue systems form the internal framework of plant organs.

5. Name the tissues under each basic tissue system.

The three tissue systems include epidermal parts, ground tissues, and conducting tissues.

Final fact:
Xylem and phloem together form vascular bundles.

Epidermal Tissue System Class 11 Biology Questions

The epidermis covers the primary plant body and directly interacts with the environment. Its appendages help in absorption, protection, transpiration control, and reduction of water loss.

6. What is epidermal tissue system?

Epidermal tissue system forms the outermost covering of the whole plant body.

Components:

1. Epidermal cells.
2. Stomata.
3. Trichomes.
4. Root hairs.

Final fact:
Epidermis is usually single-layered in the primary plant body.

7. What are the features of epidermal cells?

Epidermal cells are elongated, compactly arranged, and form a continuous layer.

1. They are usually parenchymatous.
2. They have a large vacuole.
3. Their cytoplasm lines the cell wall.
4. They form the outermost layer.

Final fact:
The epidermis protects internal tissues.

8. What is cuticle?

Cuticle is a waxy thick layer present on the outside of the epidermis. It prevents water loss.

1. It covers many aerial plant parts.
2. It reduces transpiration.
3. It is absent in roots.

Final answer:
Cuticle protects aerial parts from water loss.

9. What are root hairs?

Root hairs are unicellular elongations of epidermal cells. They absorb water and minerals from the soil.

1. They increase the absorbing surface.
2. They arise from epidermal cells.
3. They occur in roots.

Final fact:
Root hairs support mineral and water absorption.

10. What are trichomes?

Trichomes are epidermal hairs present on the stem or shoot system. They help reduce water loss.

1. They are usually multicellular.
2. They may be branched or unbranched.
3. They may be soft or stiff.
4. They may be secretory.

Final fact:
Trichomes help prevent excess transpiration.

Stomatal Apparatus Class 11 Biology Questions

Stomata are small structures with a large role in transpiration and gaseous exchange. Their guard cell shape also helps distinguish many plant groups.

11. What is stomatal apparatus?

Stomatal apparatus includes the stomatal aperture, guard cells, and surrounding subsidiary cells.

Parts:

1. Stomatal pore.
2. Guard cells.
3. Subsidiary cells.

Final answer:
Stomatal apparatus controls gaseous exchange and transpiration.

12. Explain the structure of stomata.

Each stoma has two guard cells that enclose a stomatal pore.

1. Guard cells are bean-shaped in many plants.
2. Guard cells are dumb-bell shaped in grasses.
3. Outer guard cell walls are thin.
4. Inner guard cell walls are thick.
5. Guard cells contain chloroplasts.

Final fact:
Guard cells regulate stomatal opening and closing.

13. What is the function of stomata?

Stomata regulate transpiration and gaseous exchange.

1. Carbon dioxide enters through stomata.
2. Oxygen can move out through stomata.
3. Water vapour escapes during transpiration.
4. Guard cells control pore opening.

Final fact:
Stomata connect the leaf interior with the atmosphere.

14. What are subsidiary cells?

Subsidiary cells are specialised epidermal cells present near guard cells.

1. They differ in shape and size from other epidermal cells.
2. They surround guard cells.
3. They support stomatal function.

Final fact:
Subsidiary cells form part of the stomatal apparatus.

Ground Tissue System Class 11 Biology Questions

Ground tissue forms most of the internal plant body. Its role changes with location, from storage in roots to photosynthesis in leaves.

15. What is ground tissue system?

Ground tissue system includes all tissues except epidermis and vascular bundles.

1. It contains simple tissues.
2. It includes parenchyma.
3. It includes collenchyma.
4. It includes sclerenchyma.

Final fact:
Ground tissue forms the main bulk of the plant body.

16. Where is parenchyma present in primary stems and roots?

Parenchyma is usually present in cortex, pericycle, pith, and medullary rays.

Locations:

1. Cortex.
2. Pericycle.
3. Pith.
4. Medullary rays.

Final fact:
Parenchyma often stores food and fills internal spaces.

17. What is mesophyll?

Mesophyll is the ground tissue of leaves. It contains thin-walled cells with chloroplasts.

1. It lies between upper and lower epidermis.
2. It carries out photosynthesis.
3. It may be differentiated or undifferentiated.

Final fact:
Mesophyll is the photosynthetic tissue of leaves.

Vascular Tissue System Class 11 Biology Questions

Xylem and phloem form the transport system inside plants. Questions from this section often ask vascular bundle types and their location in roots, stems, and leaves.

18. What is vascular tissue system?

Vascular tissue system consists of xylem and phloem. These complex tissues form vascular bundles.

1. Xylem conducts water and minerals.
2. Phloem transports food materials.
3. Both occur together as vascular bundles.

Final answer:
The vascular tissue system conducts materials in plants.

19. What are vascular bundles?

Vascular bundles are conducting strands made of xylem and phloem.

1. Xylem carries water and minerals.
2. Phloem carries photosynthates.
3. Vascular bundles vary in arrangement across organs.

Final fact:
Vascular bundle type helps identify roots and stems.

20. What is the difference between open and closed vascular bundles?

Open vascular bundles have cambium, while closed vascular bundles lack cambium.

Final fact:
Cambium gives open vascular bundles the ability for secondary growth.

21. What is the difference between radial and conjoint vascular bundles?

Radial vascular bundles have xylem and phloem on alternate radii, while conjoint bundles have both on the same radius.

Final fact:
Roots commonly show radial vascular bundles.

Dicot Root Class 11 Biology Questions

Dicot root anatomy is built around epiblema, cortex, endodermis, pericycle, radial vascular bundles, small pith, and two to four xylem patches.

22. Describe the internal structure of dicot root.

A dicot root has epiblema, cortex, endodermis, pericycle, vascular bundles, conjunctive tissue, and small pith.

1. Epiblema forms the outermost layer.
2. Root hairs arise from epiblema.
3. Cortex has thin-walled parenchyma.
4. Endodermis has Casparian strips.
5. Pericycle lies next to endodermis.
6. Xylem and phloem occur in radial arrangement.
7. Pith is small or inconspicuous.

Final fact:
Sunflower root is a common dicot root example.

23. What is epiblema?

Epiblema is the outermost layer of the root. Many epiblema cells protrude as unicellular root hairs.

1. It protects the root.
2. It supports absorption through root hairs.
3. It occurs outside the cortex.

Final fact:
Epiblema is the outer layer in young roots.

24. What is endodermis in dicot root?

Endodermis is the innermost layer of the cortex in dicot root.

1. It has barrel-shaped cells.
2. It lacks intercellular spaces.
3. Its radial and tangential walls contain suberin.
4. Suberin forms Casparian strips.

Final fact:
Endodermis controls movement into the stele.

25. What are Casparian strips?

Casparian strips are suberin deposits on radial and tangential walls of endodermal cells.

1. They are water-impermeable.
2. They occur in endodermis.
3. They regulate water movement.

Final fact:
Casparian strips are characteristic of root endodermis.

26. What is pericycle in dicot root?

Pericycle is a layer next to endodermis inside the root.

1. It contains thick-walled parenchymatous cells.
2. It gives rise to lateral roots.
3. It helps initiate vascular cambium during secondary growth.

Final fact:
Lateral roots originate from pericycle.

27. What is stele?

Stele includes all tissues on the inner side of the endodermis.

Components:

1. Pericycle.
2. Vascular bundles.
3. Pith.

Final answer:
Stele is the central vascular region inside endodermis.

Monocot Root Class 11 Biology Questions

Monocot roots share many tissues with dicot roots, but their vascular arrangement and pith differ. Identification questions often focus on polyarch xylem and absence of secondary growth.

28. Describe the internal structure of monocot root.

A monocot root has epidermis, cortex, endodermis, pericycle, vascular bundles, and large pith.

1. Epidermis forms the outer covering.
2. Cortex lies inside the epidermis.
3. Endodermis surrounds the stele.
4. Pericycle lies inside endodermis.
5. Xylem bundles are usually more than six.
6. Pith is large and well developed.

Final fact:
Monocot roots do not undergo secondary growth.

29. What does polyarch condition mean?

Polyarch condition means the root has more than six xylem bundles.

1. Monocot roots are usually polyarch.
2. Dicot roots usually have fewer xylem bundles.
3. Polyarch condition helps identify monocot roots.

Final fact:
Monocot roots commonly show polyarch xylem.

30. Differentiate between dicot root and monocot root.

Dicot roots usually have fewer xylem bundles and small pith, while monocot roots have polyarch xylem and large pith.

Final fact:
Xylem number and pith size separate dicot and monocot roots.

Dicot Stem Class 11 Biology Questions

Dicot stem anatomy has a ring of open vascular bundles. Students can identify it through epidermis, collenchymatous hypodermis, starch sheath, medullary rays, and central pith.

31. Describe the internal structure of dicot stem.

A young dicot stem has epidermis, cortex, endodermis, pericycle, vascular bundles, medullary rays, and pith.

1. Epidermis is the outermost protective layer.
2. It may bear trichomes and stomata.
3. Hypodermis has collenchymatous cells.
4. Endodermis is called starch sheath.
5. Pericycle occurs as sclerenchymatous patches.
6. Vascular bundles form a ring.
7. Pith occupies the centre.

Final fact:
Dicot stem vascular bundles are conjoint, open, and endarch.

32. What is starch sheath?

Starch sheath is the endodermis of dicot stem. Its cells are rich in starch grains.

1. It forms the innermost layer of cortex.
2. It lies outside the pericycle.
3. It marks the boundary of cortex.

Final fact:
Dicot stem endodermis is called starch sheath.

33. What are medullary rays?

Medullary rays are radially placed parenchymatous cells between vascular bundles.

1. They occur in dicot stem.
2. They lie between vascular bundles.
3. They connect pith and cortex regions.

Final fact:
Medullary rays are visible between vascular bundles in dicot stem.

34. What is endarch protoxylem?

Endarch protoxylem means protoxylem lies towards the centre and metaxylem lies towards the periphery.

1. Dicot stem shows endarch xylem.
2. Stem xylem commonly has endarch arrangement.
3. This helps identify stem anatomy.

Final fact:
Endarch xylem is a stem character.

Monocot Stem Class 11 Biology Questions

A monocot stem section looks different because vascular bundles are scattered. The absence of cambium and phloem parenchyma gives it clear diagnostic value.

35. Describe the internal structure of monocot stem.

A monocot stem has sclerenchymatous hypodermis, scattered vascular bundles, bundle sheath, and parenchymatous ground tissue.

1. Hypodermis is sclerenchymatous.
2. Vascular bundles are numerous and scattered.
3. Each vascular bundle has sclerenchymatous bundle sheath.
4. Ground tissue is large and parenchymatous.
5. Vascular bundles are conjoint and closed.
6. Phloem parenchyma is absent.
7. Water-containing cavities occur within vascular bundles.

Final fact:
Peripheral vascular bundles are usually smaller than central ones.

36. How can you identify a monocot stem under a microscope?

A monocot stem shows scattered conjoint closed vascular bundles with sclerenchymatous bundle sheaths.

Identification points:

1. Vascular bundles are scattered.
2. Cambium is absent.
3. Phloem parenchyma is absent.
4. Bundle sheath surrounds vascular bundles.
5. Ground tissue is not clearly divided into cortex and pith.

Final answer:
Scattered closed vascular bundles identify monocot stem.

37. Differentiate between dicot stem and monocot stem.

Dicot stem has vascular bundles in a ring, while monocot stem has scattered vascular bundles.

Final fact:
Ring arrangement is a characteristic feature of dicot stem.

38. A T.S. shows scattered vascular bundles and absent phloem parenchyma. Identify it.

The plant material is a monocot stem.

Given anatomical features:

1. Vascular bundles are conjoint.
2. Vascular bundles are scattered.
3. Vascular bundles have sclerenchymatous bundle sheaths.
4. Phloem parenchyma is absent.

Reason:
These are diagnostic features of monocot stem.

Final result:
The section is monocot stem.

Dorsiventral Leaf Class 11 Biology Questions

Dicot leaf anatomy has two distinct mesophyll layers. The upper and lower surfaces differ in stomata and tissue arrangement.

39. Describe the internal structure of dorsiventral leaf.

A dorsiventral leaf has epidermis, mesophyll, and vascular system.

1. Upper surface has adaxial epidermis.
2. Lower surface has abaxial epidermis.
3. Both surfaces have cuticle.
4. Abaxial epidermis usually has more stomata.
5. Mesophyll has palisade and spongy parenchyma.
6. Vascular bundles occur in veins and midrib.

Final fact:
Dorsiventral leaves are common in dicots.

40. What is palisade parenchyma?

Palisade parenchyma consists of elongated cells arranged vertically below the upper epidermis.

1. It contains chloroplasts.
2. It performs photosynthesis.
3. Its cells are closely arranged.

Final fact:
Palisade parenchyma lies adaxially in dorsiventral leaves.

41. What is spongy parenchyma?

Spongy parenchyma consists of oval or round loosely arranged cells below palisade parenchyma.

1. It extends towards the lower epidermis.
2. It has large intercellular spaces.
3. It helps gaseous exchange.

Final fact:
Spongy parenchyma has many air spaces.

Isobilateral Leaf Class 11 Biology Questions

Monocot leaves have similar-looking upper and lower surfaces. Grasses also show bulliform cells, which help reduce water loss during stress.

42. What is isobilateral leaf?

Isobilateral leaf has similar anatomy on both surfaces and stomata on both epidermal layers.

1. It has stomata on both surfaces.
2. Mesophyll is not differentiated.
3. Vascular bundles are nearly similar in size.
4. It usually shows parallel venation.

Final fact:
Isobilateral leaf is common in monocots.

43. What are bulliform cells?

Bulliform cells are large, empty, colourless cells present in the adaxial epidermis of grass leaves.

1. They absorb water and become turgid.
2. Turgid bulliform cells expose the leaf surface.
3. During water stress, they become flaccid.
4. Flaccid cells make leaves curl inward.

Final fact:
Bulliform cells minimise water loss in grasses.

44. Differentiate between dorsiventral and isobilateral leaf.

Dorsiventral leaves show distinct upper and lower surfaces, while isobilateral leaves show similar surfaces.

Final fact:
Mesophyll differentiation separates dicot and monocot leaves.

Class 11 Biology Anatomy of Flowering Plants Questions With Answers for Board Practice

School exams often ask identification-based questions from this chapter. The best answers mention the anatomical feature first, then the reason.

45. How do you identify root and stem using protoxylem position?

Root usually has exarch protoxylem, while stem usually has endarch protoxylem.

1. Exarch means protoxylem lies towards the periphery.
2. Endarch means protoxylem lies towards the centre.
3. Dicot stem has endarch protoxylem.

Final fact:
Protoxylem position helps identify plant organs.

46. Why are dicot stem vascular bundles called open?

Dicot stem vascular bundles are called open because cambium is present between xylem and phloem.

1. Cambium forms secondary xylem.
2. Cambium forms secondary phloem.
3. This supports secondary growth.

Final fact:
Open vascular bundles can form secondary tissues.

47. Why do monocot roots not undergo secondary growth?

Monocot roots do not undergo secondary growth because vascular cambium does not develop.

1. Cambium is absent.
2. Secondary xylem does not form.
3. Secondary phloem does not form.

Final fact:
Monocot roots retain primary structure.

48. Why does abaxial epidermis of dicot leaf have more stomata?

The abaxial epidermis has more stomata to support gaseous exchange while reducing direct water loss from the upper surface.

1. Lower surface receives less direct sunlight.
2. More stomata occur on lower epidermis.
3. Transpiration risk reduces.

Final fact:
Dorsiventral leaf usually has more stomata on the abaxial side.

49. Why do grass leaves curl during water stress?

Grass leaves curl during water stress because bulliform cells become flaccid.

1. Bulliform cells lose water.
2. They lose turgidity.
3. The leaf curls inward.
4. Exposed surface area decreases.

Final fact:
Leaf curling minimises water loss.

50. Why is phloem parenchyma absent important in identifying monocot stem?

Phloem parenchyma absence helps identify monocot stem because it is a characteristic feature of monocot vascular bundles.

1. Monocot vascular bundles are closed.
2. Phloem parenchyma is absent.
3. Bundle sheath surrounds each vascular bundle.

Final fact:
Absent phloem parenchyma supports monocot stem identification.

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