Describe the experiment conducted by Jan Baptista Von Helmont and discuss his results.

Describe the experiment conducted by Joseph L., Proust, which lead him to purpose law of constant proportions.

Describe an experiment conducted by Joseph Priestly which revealed the essential role of air in the growth of green plants.

Griffith conducted his transformation experiments on

Augustus Wesemann conducted his experiments on

Read the following information and answer the given questions. To understand the functional relationship between these phases of cell cycle Dr.N.Rao and his research associate Dr.Johnson conducted experiments on cell fusion technique.His researches revealed that the cell cycle is sequential ,unidirectional had controlled by a series of chemical signals.His experiments are considered to be a milestone in the cell cycle studies.This study threw a new hope of ray for the budding scientists to carry out reseraches on cell division. G_+1:3.5 hrs,M:1 hr are the stages in a cell cycle which occur in a manner with specific time. G_1,S,G_2 stages are collectively called……………?

You might have conducted and experiment in your school laboratory to prove that CO_2 is essential for Photosynthesis. Raju, who is in 9th class, wanted to perform the same experiment. He had some doubts regarding this experiment. Clarify them. What will be the result, if the same experiment is conducted in dark ?

Identify the scientist with the help of the following lines. In the early 20th century, he detected the point of maximum rate of photosynthesis. He conducted his · experiments on the strands of algae exposed to different colours.