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BIOLOGY 2 Marks Questions

MODEL PAPER 10 · 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
Can girdling experiments be done in monocots? If yes, How? If no, why not?
Answer
Girdling experiments cannot be done in monocots. The stem of monocot has vascular bundles scatter all over the width of the stem. Hence, we cannot reach a specific band of phloem for girdling.
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Question 22 Marks
Why does a green plant start evolving $CO _2$, instead of $O _2$. on a hot summer day? Explain.
Answer
It is due to photorespiration. With an increase in temperatures as on a hot summer day, the affinity of RuBP carboxylase for $CO _2$ reduces. It increases for $O_2$  Therefore, more and more photosynthetically fixed carbon is lost by photorespiration.
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Question 32 Marks
Define a taxon. Give some examples of taxa at different hierarchical levels.
Answer
A taxon is a particular level of hierarchy in the system of classification of living beings. The following figure gives taxa at different hierarchical levels:
Kingdom
Phylum
Class
Order
Family
Genus
Species
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Question 42 Marks
Difference between Somatostatin and Somatomedin.
Answer
SomatostatinSomatomedin
Secreted by the thalamus.Called growth mediators.
Inhibits the secretion of growth hormone from the anterior pituitary gland.Secreted by the r but their production is stimulated by growth hormone.
It is called a growth-inhibiting hormone (GHIH).Mediators can regulate the growth of somebody components like the bones etc.
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Question 52 Marks
What is the difference between cutaneous and pulmonary respiration?
Answer
When breathing takes place by diffusion through the skin, it is called cutaneous respiration. When breathing takes place through the lungs, it is called pulmonary respiration. When a frog is underwater, it breathes by cutaneous respiration. When a frog is on land, it breathes by pulmonary respiration.
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Question 62 Marks
What are the characteristic differences found in vascular tissue of gymnosperms and angiosperms?
Answer
In gymnosperms, vessel elements are not present in xylem, whereas, these are main constituents in angiosperms. In the phloem of gymnosperms, companion cells are not associated with the sieve elements. In angiosperms, companion cells are associated with the sieve elements of phloem.
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