Tag: botany
Questions Related to botany
Dichotomous branching occurs in
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Liverworts
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Funaria
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Dryopteris
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Pinus
Sphaerocarpos belongs to
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Bryophyta
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Pteridophyta
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Gymnosperms
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Angiosperms
Sphaerocarpos is a genus of liverwort. Division bryophyta is divided into three classes namely, Hepaticopsida (liverwort), Anthoceropsida and Bryopsida. Liverwort is divided into four orders namely, Marchantiales (example: Riccia), Sphaerocarpales (example: Sphaerocarpos), Jungermanniales (example: Pellia) and Calobryales (example: Calobryum).
Archegoniophore occurs in
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Chara
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Funaria
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Adiantum
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Marchantia
Archegoniophore is a stalk of a prothallium on which archegonia grows. Marchantia is a genus of liverworts. The thallus of Marchantia is dioecious in nature. It produces either female archegoniophores or male antheridiophores.
Areolated thallus is characteristic of
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Funaria hygrometrica
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Polytrichium commune
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Marchantia
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Porella pelatyphylla
The upper part of the thallus shows well-developed air chambers bounded on all sides by plates of cells, below by the storage tissue and roofed in by an epidermal layer of cells; each chamber is open to the air by a simple pore.
The product of the light reaction of photosynthesis which is not common between cyclic and non-cyclic photophosphorylation and is not utilised in the Calvin cycle is
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O$ _2$
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ATP
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$NADPH _2$
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O$ _2$ and ATP
In cyclic phosphorylation, oxygen is not evolved as the by-product where as, oxygen is evolved as a by-product during non-cyclic phosphorylation. Calvin cycle is the second stage of photosynthesis in which carbon atoms from carbon dioxide are combined, using the energy in ATP and NADPH, to make glucose.
How many quanta of lights are required to evolve one oxygen molecule in photosythesis?
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Three
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Eight
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Four
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Two
During the light phase of photosynthesis .......... is oxidized and .......... is reduced.
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$CO _2$ and Water
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Water and $CO _2$
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Water and $NADP$
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$NADPH _2$ and $CO _2$
The light reaction takes place in thylakoid discs. There, water is oxidized and oxygen is released. The hydrogen is accepted by $NADP$ and hence get reduced to $NADPH _2$.
Which of the following process is supported by photolysis?
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Oxidation
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Reduction
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Electroporation
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Transformation
Photolysis is the process of breakdown of water molecule in the presence of sunlight. It results in the release of oxygen and hydrogen. It is also called as photodecomposition. It occurs during photosynthesis in a series of light-driven oxidation events. In this, water absorbs photons and the energy released during this process drives oxidation processes induced by light.
Which one is not include in photochemical phase
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Light absorption
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Photophosphorylation
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$H _2O$ spliting
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$CO _2$ reduction
Which statement is correct for given reaction for photosynthesis?
$ 2 H _2 A + CO _2 \xrightarrow []{light} 2A + CH _2 O + H _2 O $
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$H$ donor is oxidisable substrate
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$O _2 $ evolve from $H _2 O $ if reducible compound is $H _2 O $
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Glucose gain its oxygen from $H _2 O $
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Both A and C
The light reaction of the photosynthesis starts when the chlorophyll loses its electron after absorbing the light. In order to maintain the continuity of the reaction, there is a requirement of an oxidizable substance that can donate its electron to the chlorophyll. Water acts as the electron donor through a process called photolysis of water. In this process, the oxygen is also released as a by-product.