Photosynthesis Flashcards
Who did bell jar experiment And in which year?
Joseph Priestley in 1770
Name the scientist who did a similar experiment as Joseph Priestley with an aquatic plant also name the plant used?
Jan Ingenhousz
Plants name is Hydrilla
First action spectrum for photosynthesis
T. W. Engelmann
Name the green algae used in T. W. Engelmann experiment
A green Alga, Cladophora
Donor of hydrogen in plants ?
Water in most plants and H2S in some bacteria
Who concluded that photosynthesis is light dependent reaction
Microbiologist, Cornelius van niel
Number of chloroplast in one Mesophyll cell
20 - 40
Light reaction takes place in
Thylakoid membrane
Dark reaction takes place in
Stroma
Photosystem in grana
PS I and PS II
Photosystem in stromal lamellae
PS I
Do chloroplasts change position
Yes chloroplast changes position according to light intensity with the help of cytoplasmic streaming
How are chloroplast aligned
Chloroplasts align with their flat surfaces parallel to the wall in low light intensity and they are perpendicular to the incident light in high light intensity
Light reaction are
Photochemical reaction
Dark reaction are
Carbon reactions. Dark reaction does not mean that they occur in darkness or that they are not light dependent
What are pigments
Pigments are chemical compound which can absorb fixed wavelength and excite electron
State the relation between energy released and wavelength of light in a pigment
Energy released is indirectly proportional to wavelength of light
What are antennae
They absorb light from Sun or from other pigment and pass them on to other pigments of higher wavelength
What is reaction centre
The pigment which performs the chemical reaction
Examples of antennae and reaction centre
Chlorophyll A is reaction centre
Chlorophyll B, carotene and xanthophyll are examples of antennae
Three components of photosystem are
Pigments, electron carrier and enzyme
Pump is responsible for generation of gradient, True or false
True
Root hair is present only in the zone of
Maturation
Water absorption is purely …………process
Passive
What is responsible for stopping Apoplastic movement in endodermis
Casparian strip (Suberin)
Why is water forced to move symplast through endodermis
Endodermis controls type and quantity of salute which is moving upward
Why is Apoplast preferred than symplast
Because Apoplast is fast and offers no resistance while symplast offers more resistance and is a slow movement
…………… cannot germinate and establish without the presence of mycorrhiza
Pinus seeds
Root pressure is applicable when is………………… absent
Transpiration
What is transpiration ratio
It is number of H2O loss per one CO2 entering
Scotoactive
Stomata that open at night
Father of plant physiology
Stapen hales
