First two members of homologous series having functional group –Cl:
a. CH₃Cl (Chloromethane)
b. CH₃CH₂Cl (Chloroethane)

Under favourable conditions, Spirogyra reproduces by a process known as fragmentation. This is an asexual method of reproduction.

An ecosystem is a place where biotic and abiotic organisms of various communities interact with each other. For example, a garden is an ecosystem which consists of Ponds, plants, grasslands, insects, water, soil etc.

Four properties of the image formed by the given convex mirror are:  
(i)   Virtual 
(ii)  Always forms behind the mirror between focus and pole.  
(iii) Image is always erect 
(iv) Small in size 

Sustainable Management: It is a pattern of management that promises the use of natural resources in such a way that they meet the human needs in the present as well as in the future.

Advantage of Reuse over Recycling
Recycling requires a large amount of energy and money. Reuse, on the other hand,  simply involves using things, again and again, preserves the embodied energy originally used in manufacturing an item. Reuse also creates less air and water pollution than recycling. Hence, reuse is preferred over recycling.