(iv) Why it is good to have ventilators at the top of the walls?
(v) When would dialysis be required?
(vi) What is the difference between asexual and sexual reproduction?
(vii) What is vegetative propagation?
(viii) How is grafting used to develop new pants?
Answers
vi)
iv) Ventilators are provided in the rooms at the top of the roofs because if the air inside the room gets hot, the hot air rises up and flows through these ventilators and thus cool air remains at bottom. It brings cool and fresh air in the room. Thus ventilators maintain conventional currents to keep the air fresh in the room.
vii) Vegetative propagation is a type of asexual reproduction in higher plants, specially angiosperms. It is process of formation of new plants from the detached vegetative parts of the parent plant.
Vegetative propagation may be natural or can be done artificially.
Natural vegetative propagation occurs by means of roots, underground stems, subaerial stems, aerial shoots, leaves and bulbils.
Artificial vegetative propagation occurs by use of special vegetative parts such as root tubers, corm, parts of rhizome etc., or by cutting, layering, grafting and bud grafting.
viii) Grafting is an artificial propagation technique in which tissue from one plant, the scion, is attached to another, the rootstock. The rootstock produces new vascular tissue with which to feed scion the graft heals itself.
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