Photosynthesis- all Flashcards
(104 cards)
Photosythesis is a —- or —- process
Physico-chemical or Photobiochemical process
Light energy is converted into — energy in PS
chemical
ps is a redox reaction, where oxidation of —- occurs and reduction of —-
oxy of h2o- light rean
red of co2- dark rean
PS is — and energy absorbing (—-) process
anabolic and endergonic
dark rean is also called
biosynthetic process
____ half leaf exp proved that —- is essential for ps
Molls, co2
1st exp on ps was done by —- 300 years ago called —-
Joseph priestly (1770)
Bell Jar exp
What was observed when lit candle and mice were placed in jar alone individually
Candle light extinguished and mice died
When mint (—) was added into jar with candle and mice?
Mentha bipalaca
Mice/candle- nothing happens
What was the conclusion of Joseph priestly?
Plants restore to air whatever breathing animals and candles remove
All animals including human beings depend on —- for their food.
plants
Green plants, in fact, have to make or rather — the food they need and all other organisms depend on them for their needs.
synthesise
Green plants carry out
‘photosynthesis’, a —- process by which they use light energy to drive the synthesis of — compounds.
physico-chemical
organic
Ultimately, all living
forms on earth depend on — for energy.
sunlight
—- is the basis of life on earth.
The use of energy from
sunlight by plants doing photosynthesis
Photosynthesis is important due to two reasons..
- Primary source
of all food on earth - Responsible for the release of oxygen into the
atmosphere by green plants.
Chlorophyll (green pigment of the leaf), —and — are required for
photosynthesis to occur.
light and co2
Experiment for starch formation in two leaves – a — leaf or a leaf that was partially covered with
black paper, and one that was exposed to light. On testing these leaves
for starch it was clear that photosynthesis occurred only in the — parts of the leaves in the presence of –.
variegated
green, sunlight
Half-leaf experiment is where a part of a leaf is
enclosed in a test tube containing some —-(which absorbs CO2
), while the other half is
exposed to air.
The setup is then placed in light for some time. On testing for — later in the two halves of the leaf, it is found that — was required for photosynthesis.
KOH soaked cotton
starch, CO2
Joseph Priestley (1733-1804) in 1770 performed a series of experiments that revealed the — in the growth of green plants.
essential role of air
—– discovered oxygen in
year (—).
Priestly, 1774
Priestley concluded that
a burning candle or an animal that breathe the air —-
damage the air
Using a similar setup as the one used by Priestley, but by placing it once in the — and once in the sunlight, —- (1730-1799)
showed that sunlight is essential to the plant process that somehow
purifies the air fouled by burning candles or breathing animals.
dark
Jan Ingenhousz
Ingenhousz in an elegant experiment with an — showed that in bright sunlight, small bubbles were formed around the green parts while in the dark they did not. Later he identified these bubbles to be of
—.
aquatic plant (==hydrilla exp)
oxygen
