Page 101 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

SCIENTISTS AND INVENTIONS

Sl.no. Name of the Scientist Year Discovered (or) innovated

1. Von Helmont  Plants get their food materials not only
from soil but also from other sources.
 Water was essential for the increase of
plant mass.

2. Van Neil 1931  Light plays a specific role in photosynthesis.
(Dutch)  Sulphur bacteria utilized H S instead of
2
H O for photosynthesis. In this process
2
sulphur liberated instead of O .
2
 Proposed an equation for photosynthesis
light
CO  2 H O   CH O  H O O

2 2 2 2 2
Chlorophyll
3. Priestly 1774  He did experiments with mint plant,
candle and mouse and discovered oxygen.

4. Lavoisier  The name “Oxygen” was first coined by
him.

5. Jan Ingeh housz 1979  He did hydrill piants experiment and
noticed “Oxygen released from plants
only in the presence of light”.

6. Engel man 20th  did experiments on algae.
century  detected “point of maximum rate of
photosyn”.

7. Pelletier of 1817  extract green coloured substance from
Caventou leaves and named that chlorophyll.

8. Julius Von sachs 1883  chlorophyll does not spread in through
out the plant cell. It present only in the
organalle called “chloroplast”.

9. Daniel I. Arnon. 1954  seperate the chloroplast from leaf with
out any damaging.

10. John Daper 19th  Human physiology - book.
century

11. Rene Laennec 1816  Stethoscope. (Bamboo)

12. Girolamo Fabrici 1574  Veins having small valves.
(Italy)  Blood always flows from left ventricle to
all parts of the body.
 Blood reaches hearts through veins.

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