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BIOLOGY 2 Marks Questions

MODEL PAPER 9 · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 6 questions.

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2 Marks Questions

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

Question 12 Marks
What is non-cyclic photophosphorylation?
Answer
It is the process of formation of ATP and NADPH, during which electron emitted by reaction centre $P_{700}$ is not returned to it but is substituted by the electron emitted by reaction centre$P_{680}$, which in turn gets the electron released by photolysis of water.
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Question 22 Marks
What do you understand by biosynthetic phase of photosynthesis?
Answer
The next phase of photosynthesis after light reaction is the biosynthetic phase. In this, ATP and NADPH are used for synthesizing the food. $CO _2$ is fixed to form $CO _2$ fixation product. This stage is also called the dark phase as it is independent of light, but deals
with the products of light reaction.
Since sugar is synthesized in this phase, it is also called as biosynthetic phase.
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Question 32 Marks
What is a taxon?
Answer
A taxon is a group of (one or more) organisms, which a taxonomist adjudges to be a unit.
Usually, a taxon is given a name and a rank, although neither is a requirement.
It is a level of hierarchy in biological classification. Example: Family is a taxa.
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Question 42 Marks
Comment hormones are called informational molecules.
Answer
Hormones are known as informational molecules because their synthesis takes place in one part of the body, i.e., the endocrine cells and are carried by the blood to another part of the body, i.e., target organ or tissues where they stimulate or inhibit the specific physiological processes according to the need of the body.
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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
Write one difference between mesophyll of dicot leaf and a monocot leaf.
Answer
In dicot leaves, mesophyll is differentiated into palisade and spongy parenchyma. In the case of monocot leaves, mesophyll is not differentiated and all cells are like spongy parenchyma.
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