Explain Spring wood and Autumn wood. 

Late wood

Early wood

Explain spring ball model of elastic behaviour of solids.

What is spring constant ?

Two blocks of masses m and M connected by a spring are placed on frictionless horizontal ground. When the spring is relaxed, a constant force F is applied as shown. Find maximum extension of the spring during subsequent motion.

Members of which fungal class are found in aquatic habitats and on decaying wood in moist and damp places or as obligate parasites.

A spring has spring constant k and l. If it cut into piece spring in the proportional to alpha : beta : gamma then obtain the spring constant of every piece in term of spring constant of original spring (Here, alpha, beta " and "gamma are integers).

Members of Phycomycetes are found in : (i) Aquatic habitats (ii) On decaying wood (iii) Moist and damp places (iv) As obligate parasites on plants. Choose form the following options. (A) (i) and (iv) (B) (ii) and (iii) (C) All of these (D) None of these