Name the different components of xylem and draw a living component of it.

One electron is present in the outer most shell of the atom of an element X. What would be the nature and value of the charge on the ion formed if this electron is removed from the outer most shell?

Cells of onion peel and RBC are separately kept in hypotonic solution, what among the following will take place? Explain the reason for your answer.

(a) Both the cells will swell.

(b) RBC will burst easily while cells of onion peel will resist the bursting to some extent.

(c) a and b both are correct

(d) RBC and onion peel cells will behave similarly.

Classify the following organisms based on the absence/presence of true coelom (i.e. acoelomate, pseudocoelomate and coelomate)

Spongilla, Sea anemone

Planaria, Liver fluke

Wuchereria, Ascaris

Nereis, Scorpion

Earthworm, Birds

Fishes, Horse

Which cell organelle controls most of the activities of the cell?