What is the difference between lenticels and stomata

5

(a)

Deciduous  plants shed their leaves during hot summer or autumn. This process of shedding of keaves is called abscission .Apart from physiological changes, what anatomical mechanism is involved in the abscission of leaves?

5

(a)

What is the commercial source of cork?How is it formed?

5

(a)

Explain the process of secondary growth in the stems of woody angiosperms. What is its significance?

5

(a)

Define the following terms:
(a) Aestivation
(b) Placentation
(c) Actinomorphic
(d) Zygomorphic
(e) Superior ovary
(f) Perigynous flower
(g) Epipetalous stamen

5

(a)

Describe modifications of stem with suitable examples.

5

(a)

Take one flower each of the families Fabaceae and Solanaceae and write its semi-technical description. Also draw their floral diagram after studying them.

5

(a)

What is a flower? Describe the parts of a typical angiosperm flower.

5

(a)

Describe stem. Explain various modifications of stem.

5

(a)

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

5

(a)