What role does vascular plants play in keeping the earth green? Which features help them to dominate the earth?

5

(a)

How is natural system different from artificial system of classification? List some features.

5

(a)

Why is Ginkgo Biloba called a living fossil? Explain how is it useful for horticulturists. What are its important features? Why horticulturists prefer to grow only male plants?

5

(a)

Describe classification of algae. Write main characters of every group in detail.

5

(a)

Describe the economic importance of seedless vascular plants as
(i) Food source
(ii) Soil erosion
(iii) Biofertiliser
(iv) Drugs
(v) Ornamental plants.

5

(a)