"Growth curve is always 'S' shaped or sigmoid" Justify.

Secondary growth is absent in monocotyledonous plants. Justify.

A growth curve which follows lag, log and plateau phases is

When a particle undergoes S.H.M., there is always a constant ratio between its displacement and

Explain the growth curve of population shown in the given figure .

In the figure of Sigmoid growth curve given below, label segments 1,2 and 3.

Properties of cell organelles are not always found in the molecular constituents of cell organelles. Justify.

The speed limit for the vehicle on a road is 108 km//hr . A policeman detects a drop of 25% in the pitch of the horn of a car as it passes him. Is the policeman justified in punishing the car driver for crossing the speed limit? (Velocity of sound = 350 m//s .)

Consider a closed loop C in a magnetic field (figure shown ). The flux passing through the loop is defined by choosing a surface whose edge coincides with the loop and using the formula phi = B_1. dA_1 + B_2. dA_2 +....... . Now if we choose two different surfaces S_1 and S_2 having C as their edge, would we get the same answer for flux? Justify your answer.

A triple star system consists of two stars each of mass m in the same circular orbit about central star with mass M=2xx10^(33)kg . The two outer stars always lie at opposite ends of a diameter of their common circular orbit the radius of the circular orbit is r=10^(11) m and the orbital period each star is 1.6xx10^(7)s [take pi^(2)=10 and G=(20)/(3)xx10^(-11)Mn^(2)kg^(-2) ] Q. The orbital velocity of the outer stars is:

Metals get attacked by substances around it such as moisture, acids, etc. Metal is said to 'corrode' due to this attack and the process is called corrosion. Many metals like iron, copper, silver, etc. get corroded. When iron is exposed to moist air, it undergoes corrosion and a reddish brown coloured solid layer is formed on its surface. Corrosion of iron, which is known as rusting, is a serious problem as enormous amount of money is spent every year to replace damaged iron. Similarly, copper reacts with moisture and. CO_(2) in air to form a green coloured coating of basic copper carbonate on its surface. Silver acquires a black colour when exposed to air containing H_(2)S due to the formation of silver sulphide on its surface. Based on the above paragraph, answer the following question. Do gold ornaments corrode? Justify.