Bachelor’s Degree Programme (BSCG) – Plant Anatomy and Embryology Assig. Answer | BBYCT – 135 (Q-1)
1. a) Define the following terms:
i) Adventitious roots
b) State whether these statements are ‘True’ or ‘False’:
i) Funiculus is the stalk by which seeds are attached to a fruit wall.
ii) Collenchyma is composed of living cells with lignified cell wall.
iii) Outer and inner tangential walls of the endothecial cells help in
dehiscence of anther.
iv) In dichogamy, the androecium and gynoecium mature at the
v) In most of the angiosperms the division of the zygote is
transverse resulting in formation of a small apical cell and a
large basal cell.
i) Adventitious roots are plant roots that form from any nonroot tissue and are produced both during normal development (crown roots on cereals and nodal roots on strawberry) and in response to stress conditions, such as flooding, nutrient deprivation, and wounding.
ii) Cuticle is a protecting film covering the epidermis of leaves, young shoots and other aerial plant organs without periderm.
iii) Heterophylly is the development of different leaf forms in a single plant depending on the environmental conditions.
iv) Tapetum is the innermost cell layer in the anther, which surrounds the developing pollen mother cells (PMCs) and/or microspores supplying nutrition and enzymes required for microsporogenesis and pollen maturation.
v) A pollinium is a coherent mass of pollen grains in a plant that are the product of only one anther, but are transferred, during pollination, as a single unit.
i) True, Seed is attached to the fruit by a stalk, the funiculus (funicle).
ii) False, Collenchyma support tissue of living elongated cells with irregular cell walls.
iv) False, In dichogamous species the receptivity of the stigmas and shedding of the pollen occur at different times within the same flower
v) True, The zygote divides transversely in majority of the angiosperms resulting in a small apical cell or terminal cell and a large basal cell towards the micropyle.