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BIOLOGY 2 Marks Questions

MODEL PAPER 9 · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 6 questions.

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

Question 12 Marks
Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer.
Biogas, Citric acid, Penicillin and curd
Answer
The order of arrangement of products according to their decreasing importance is:
Penicillin- Biogas Citric acid-Curd
  • Penicillin is the most important product for the welfare of human society. It is an antibiotic, which is used for controlling various bacterial diseases.
  • The second most important product is biogas. It is an eco-friendly source of energy.
  • The next important product is citric acid, which is used as a food preservative.
  • The least important product is curd, a food item obtained by the action of lacto bacillus bacteria on milk.
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Question 22 Marks
Name the microbes that help production of the following products commercially:
(a) Statin
(b) Citric acid
(c) Penicillin
(d) Butyric acid
Answer
a. Monascus purpureus
b. Aspergillus niger
c. Penicillium notatum
d. Clostridium butylicum.
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Question 32 Marks
Name the labels A, B, C, D, E and F in the diagram of seminiferous tubule.
Image
Answer
A-Spermatogonium
B-Primary spermatocyte
C-Secondary spermatocyte
D-Spermatid
E-Spermatozoa
F-Sertoli cell
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Question 42 Marks
These pictures show the gynoecium of (A) Papaver and (B) Michelia flowers, Write the difference in the structure of their ovaries.
Image
Answer
A. represents the multi carpellary and syncarpous pistil of Papaver.
B. represents the multi carpellary and apocarpous gynoecium of Michelia.
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Question 52 Marks
Read the sequence of the nucleotides in the given segment of mRNA and the respective amino acid sequence in the polypeptide chain.
Image
Polypeptide: met-phe-met-proline-valine-serine
i. Provide the triplet of bases (codon) for
a. valine
b. proline
ii. Write the nucleotide sequence of the DNA strand from which this mRNA was transcribed
iii. What does the last codon of this RNA stand for?
Answer
i. Valine : GUU, Proline: CCU
ii. Nucleotides of DNA strand : TAC AAA TAC GGA CAA AGA ATT
iii. UAA : Stop
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Question 62 Marks
What are transgenic animals? How was the first transgenic cow found to be more useful than the normal cow, for humans?
Answer
Transgenic animals that produce useful biological products can be created by the introduction of the portion of DNA. Rosie was the first transgenic cow and it was produced in 1997. The gene for human protein alpha-lactalbumin was introduced in this cow. Thus, the cow could produce protein-enriched milk. This milk was nutritionally more balanced than natural cow milk.
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