New cells generate from
(a) bacterial formatation (b) regeneration of old cells
(c ) pre-existing cells (d) abiotic materials

Which of the following is not correct (a) Robert brown discovered the cell. (b) Schleiden and schwann formulated the cell theory. (c ) Virehow explained that cells are formed from pre-existing cells. (d) A unicellular organism carries out its life activities within a single cell.

Who proposed the theory that "cells arise only from the pre-existing cells"?

Events that take place in eutrophication on given below (a) excessive growth of algae (b) depletion of dissolved oxygen (c ) bacteria feed on dead algae cells (d) aquatic body becomes rich in phosphates The correct order of events cells that occurs here is

New cell membrane during animal cytokinesis arises from

In the leaves of C_(4) plants, malic acid formation during CO_(2) fixation occurs in the cells of

Which of the following is correct: (a) Cells of all living organisims have a nucleus. (b) Both animal and plant cells have a well denifed cell wall. (c ) In prokaryotes, there are no membrane bound organelles. (d) Cells are formed de novo from abiotic materials.

Which two of the following changes (A-B) usually tend to occur in the plain dwellers when they move to high altitudes (3500 m or more ) (A) Increase in red blood cell size (B) Increase in red blood cell production ( C) Increased breathing rate (D) Increase in thrombocyte count

Study the figure given below and answer the questions that follow : (a)Name the stage of human embryo the figure represents. (b)Identify 'A' in the figure and mention its function . ( c )Mention the fate of the inner cell mass after implantation in the uterus . (d)Where are the stem cells located in this embryo ?