Fonte: gare di altri paesi/India/biologia/inbo2005-Q.pdf · Apri PDF · apri PDF p.1
Cluster: Meccanica
Soluzioni (stessa cartella): · · · · · · · · · · ·
Problema 1
30th Jan, 2005
- Copyright Information This question paper is the property of Homi Bhabha Centre for Science Education, Tata Institute of Fundamental Research, V. N. Purav Marg, Mankhurd, Mumbai. All the contents (diagrams, graphics and text) of this paper are copyrighted. No part of the paper may be reproduced in any form without prior permission from the Centre.
1 INDIAN NATIONAL BIOLOGY OLYMPIAD – 2005*
THEORY PAPER 30th Jan, 2005 Duration : 2 hrs
Maximum marks: 300
The question paper is divided into Part A and Part B.
Part A :
Part A consists of 31 questions carrying 3 marks each.
All 31 questions of Part A are of multiple choice type, with only one correct answer for each question.
Mark the correct answer with ‘X’ on the answer sheet, which is provided separately. (The correct way of marking a cross is shown below.) Use a dark pencil to mark your answer.
Q.No. a b c d 20
Each wrong answer will have negative marking as indicated in the scoring key.
Part B:
Part B has 23 questions carrying a total of 207 marks.
Answers to Part B should be written on the question paper and it should be submitted to the examiner stapled with the answer sheet of part A.
SCORING KEY
CORRECT NO. OF ANSWERS: X INCORRECT NO. OF ANSWERS: Y SCORE: PART A: 3X – Y
- Copyright Information This question paper is the property of Homi Bhabha Centre for Science Education, Tata Institute of Fundamental Research, V. N. Purav Marg, Mankhurd, Mumbai. All the contents (diagrams, graphics and text) of this paper are copyrighted. No part of the paper may be reproduced in any form without prior permission from the Centre.
2 INDIAN NATIONAL BIOLOGY OLYMPIAD – 2005 PART A
CELL BIOLOGY
- Osmotic pressure measurements of three solutes resulted in the following graph. The three solutes most likely are:
a. I: glucose II: KCl III: NaCl b. I: NaOH II: NaCl III: HCl c. I: CaCl2 II: sucrose III: AgCl d. I: glucose II: NaCl III: Ca(NO3)2
-
Many food materials are well preserved using high salt concentration. The protective effect provided by salts is most likely due to: a. dehydration of food. b. alteration of pH of food. c. alteration of enzymes of micro organisms. d. all the above
-
Unsaturated fatty acids predominate in the lower parts of legs of animals living in extreme cold regions while saturated ones predominate in the upper parts. Which of the following correlates with the above observation? a. Unsaturated fatty acids are more fluid at lower temperatures. b. Saturated fatty acids are more fluid at lower temperatures. c. Unsaturation leads to more energy content, which helps maintain body temperature. d. Saturated fatty acids offer protective effects at low temperatures.
0 0.2 0.4 0.6 0.8 1.0 II
Pressure (atm) Concentration (mol/l) III 80 20 40 60 I
- Copyright Information This question paper is the property of Homi Bhabha Centre for Science Education, Tata Institute of Fundamental Research, V. N. Purav Marg, Mankhurd, Mumbai. All the contents (diagrams, graphics and text) of this paper are copyrighted. No part of the paper may be reproduced in any form without prior permission from the Centre.
3 4. Effect of pH on the osmotic pressure of haemoglobin in solution is tabulated.
The above effect is due to:
a. protein folding b. protein denaturation c. haemoglobin oxygen interaction d. all the above
- When changes in oxygen consumption and carbon dioxide production for the Siberian hamster approximately 1 hour after food access was measured, following graph was obtained.
If the above data is converted into respiratory quotient (RQ) and plotted against the temperature, the graph that will be obtained is:
pH Osmotic pressure (mmHg/gm protein/100ml) 5.0 21.5 7.2 5.0 9.6 15.6 10.2 21.4 a.
b.
c.
d. RQ RQ RQ RQ Air temperature (0C) 0.7 0.9 Air temperature (0C) 0.7 0.9 Air temperature (0C) 0.7 0.9 Air temperature (0C) 0.7 0.9
- Copyright Information This question paper is the property of Homi Bhabha Centre for Science Education, Tata Institute of Fundamental Research, V. N. Purav Marg, Mankhurd, Mumbai. All the contents (diagrams, graphics and text) of this paper are copyrighted. No part of the paper may be reproduced in any form without prior permission from the Centre.
4 6. There are several factors that affect the binding of O2 to Hemoglobin. In the following graph, the shift in the saturation curve of hemoglobin from I to III is a result of:
a. decrease in body temperature b. increase in pCO2 in the tissue c. increase in blood pH d. all the above
- The manganese-containing superoxide dismutase (MnSOD) that catalyses conversion of superoxide ions is found in animal and plant mitochondria as well as in plant chloroplasts. Mark the appropriate statements.
i. It is likely to be activated under stress. ii. It is most likely to be found in the bacterial cells. iii. It is likely to be synthesized in obligate anaerobes. iv. It is likely to have some role in respiration.
a. ii and iv b. i and iv c. ii and iii d. i and ii
- The pH of orange juice and distilled water were found to be 3.0 and 6.0 respectively. This means: a. orange juice has a hydrogen ion concentration twice as that of distilled water. b. the hydrogen ion concentration of orange juice is 103 moles/litre and that of distilled water is 106 moles/litre. c. hydrogen ion concentration of orange juice is 1000 times greater than distilled water. d. both b and c
% saturation of hemoglobin I II III 0
70 pO2 (mm of Hg) 70
- Copyright Information This question paper is the property of Homi Bhabha Centre for Science Education, Tata Institute of Fundamental Research, V. N. Purav Marg, Mankhurd, Mumbai. All the contents (diagrams, graphics and text) of this paper are copyrighted. No part of the paper may be reproduced in any form without prior permission from the Centre.
5 PLANT SCIENCES
- Some statements about phloem tissue are made.
i. Phloem is basically a parenchyma tissue. ii. The pores of sieve plates are essentially welldeveloped plasmodesmata. iii. The cytoplasm of sieve element is very simple, with no developed organelles. iv. Transport of sugars and amino acids through phloem is bi-directional.
The correct statements are: a. i and iv b. i, ii and iii c. i, ii and iv d. i, ii, iii and iv
- Observe the electron micrograph of a plant part below. Portion labeled A indicates:
a. parenchyma b. cambium c. phloem d. mucilaginous cells
- Young plant seedlings were subjected to two different growth conditions. Results at the end of 10 days are given in the table.
Experimental set-up Average shoot length Average root length Total no. of leaves 1. Sterile soil 2 mm
12 mm 3 2. Sterile soil inoculated with fungal culture 8 mm 10 mm 13
A
- Copyright Information This question paper is the property of Homi Bhabha Centre for Science Education, Tata Institute of Fundamental Research, V. N. Purav Marg, Mankhurd, Mumbai. All the contents (diagrams, graphics and text) of this paper are copyrighted. No part of the paper may be reproduced in any form without prior permission from the Centre.
6
The relationship observed between fungus and plant is: a. commensalism b. mutualism c. parasitism d. neutral interaction
- The structure that helps grasses to make excellent ground cover for preventing erosion is:
a. root cap b. fibrous roots c. sheathing leaf base d. stolons
- Find the odd set out.
a. stolons, rhizomes, corms b. thorns, bracts, stipules c. contractile roots, pneumatoph
Topic: Conservation of Energy, Thermodynamics, Fluid Mechanics Metodi: Energy Conservation Method, Conservation Laws, First Law of Thermodynamics, Thermodynamic Cycle Analysis Competenze: Physical Reasoning, Mathematical Modeling Fonte: Testo (PDF) — p.1