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Biology Class 11 NCERT Solutions: Chapter 6 Anatomy of Flowering Plants Part 2

Q: 1. Q: 4. Draw illustrations to bring out anatomical difference between

(A) Monocot root and dicot root

(B) Monocot stem and dicot stem

Answer:

(A) Monocot root and dicot root

Illustration: Biology Class 11 NCERT Solutions: Chapter 6 Anatomy of Flowering Plants Part 2
Illustration: Biology Class 11 NCERT Solutions: Chapter 6 Anatomy of Flowering Plants Part 2

(B) Monocot stem and dicot stem

Illustration: Biology Class 11 NCERT Solutions: Chapter 6 Anatomy of Flowering Plants Part 2
Illustration: Biology Class 11 NCERT Solutions: Chapter 6 Anatomy of Flowering Plants Part 2

Q: 5. Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or dicot stem? Give reasons.

Answer

The dicot stem is characterised by the presence of conjoint, collateral, and open vascular bundles, with a strip of cambium between the xylem and phloem. The vascular bundles are arranged in the form of a ring, around the centrally located pith. The ground tissue is differentiated into the collenchyma, parenchyma, endodermis, pericycle, and pith. Medullary rays are present between the vascular bundles.

Illustration: Biology Class 11 NCERT Solutions: Chapter 6 Anatomy of Flowering Plants Part 2

The monocot stem is characterised by conjoint, collateral, and closed vascular bundles, scattered in the ground tissue containing the parenchyma. Each vascular bundle is surrounded by sclerenchymatous bundle-sheath cells. Phloem parenchyma is absent and water-containing cavities are present.

Illustration: Biology Class 11 NCERT Solutions: Chapter 6 Anatomy of Flowering Plants Part 2