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BIOLOGY 2 Marks Questions

MODEL PAPER 5 · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 6 questions.

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6 questions · self-marked practice — reveal the answer and mark yourself.

Question 12 Marks
What can we conclude from the statement that the action and absorption spectrum of photosynthesis overlap? At which wavelength do they show peaks?
Answer
Chlorophyll 'a' and chlorophyll 'b' absorb lights of different wavelengths.Chlorophyll 'a' is the main pigment related to photosynthesis. The absorbance of light by chlorophyll pigments shows the overlap between the absorption spectrum and the action spectrum (both are curves).
The blue and red regions of the spectrum, they show peaks.
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Question 22 Marks
Give comparison between cyclic and non-cyclic photophosphorylation.
Answer
Cyclic photo phosphorylationNon-cyclic photo phosphorylation
Reaction centre $P_{700}$ is the electron emitter and also electron acceptor.Reaction centre $P_{680}$ is the electron emitter and $P_{700}$ is the electron acceptor.
It synthesises the only ATP.It forms both ATP and $NADPH _2$.
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Question 32 Marks
What makes species a basic taxonomic category?
Answer
Species is the lowest of a population or basic taxonomic category which consists of one or more individuals that resemble one another more closely than individuals of other species The members of a species interbreed freely and are reproductively isolated from members of other species. These features make the species basic taxonomic category.
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Question 42 Marks
Which hormone helps maintain the bone density in the body?
Answer
The sole purpose of the parathyroid glands is to control calcium within the blood in a very tight range between 9.0 and 10.1. In doing so, parathyroids also control how much calcium is in the bones, and therefore, how strong and dense the bones are.
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Question 52 Marks
How does a gap junction facilitate intercellular communication?
Answer
Gap junctions are fine hydrophilic channels between two adjacent animal cells. These are formed with the help of two protein cylinders; called connexions. Gap junctions allow small signaling molecules to pass from one cell to another and thus they facilitate intercellular communication. Movement through gap junctions is controlled by pH and $Ca ^{2+}$ concentration.
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Question 62 Marks
Classify vascular bundles on the basis of the position of the protoxylem.
Answer
Vascular bundles on the basis of the position of protoxylem
i. Endarch Protoxylem faces the centre of the plant organ.
ii. Exarch Protoxylem faces periphery of the plant.
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