A crane had DDT level as 5 ppm in its body. What would happen to the population of such birds? Explain giving reasons.

"large scale cultivation of Spirulina is highly advantages for human population". Explain giving two reasons.

A population of Paramecium cauatum was grown in a culture medium. After 5 days the culture medium became overcrowded with Paramecium and had depleted nutrients. What will happen to the population and what type of growth curve will the population attain? Draw the frowth curve.

Magnetic moment of [MnCl_4]^(2-) is 5.92 BM. Explain giving reason.

Suupose a helical spring is suspended from the roof and a very small weight is attached to its lower end. What will happen to the spring when the current is passed thorugh it? Give reason to support your answer.

Sketch a graph between frequency of incident radiations and stopping potential for a given photosensitive material. What information can be obtained from the value of the intercept of potential axis? A source of light of frequency of greater than the threshold freuency is placed at a distance of 1 m from the cathode of a photocell? the distnace of hte light sources from the cathode is reduced explain giving reasons, what change will you observe in the Stopping potential.

What would happen to immune system if thymus gland is removed from the body of a person?