No. of Printed Pages: 12 ILSE-051
BACHELOR OF SCIENCE (B.Se.)
Term-End Examination
June, 2016

ODE-gO LIFE SCIENCE LSE-05 PHYSIOLOGY
Time: 2 hours Maximum Marks: 50
Note: Use separate answer sheets for Part 1 and Part 11. Be brief and precise in your answers. Draw neat and labelled diagrams, wherever necessary.
PART I
Animal Physiology

Note: Question No. 1 is compulsory. Attempt any four questions from questions no. 2 to 7.

1. Choose the correct answer:

In humans, lysine is one of the

essential.amino.acids

non-essential amino acids

essential fatty acids

non-essential fatty acids

Match the items given in Column A with those given in Column B

ColumnA ColumnB

Atrioventricular node Molluscs

Radula Sponges

Choanocytes Crustaceans

Green gland Heart

Fill in the blanks 2

The hormone insulin is secreted by .

The physiological thermostat is located in the of the mammals.

2. Summarize the various enzymes associated with the digestive system. What are the end products of digestion How are fats absorbed in human body? 5

3. Describe the process of excitation in myogenic heart of mammals. 3

Define depolarization and repolarization in a nerve fiber. 2

4. Tabulate the hormones secreted by the anterior pituitary gland and give their functions. How does hypothalamus regulate the secretion of these hormones?

5. Draw a labelled diagram of mammalian nephron. Explain how urine is concentrated in it. Give renin-angiotensin mechanism for the regulation of kidney function. 5

6. How is oxygen transported by blood Describe the various factors that affect oxygen dissociation curve. 5

7. Differentiate between the following with suitable examples 2x2

Osmoregulators and Osmoconformers

Smooth muscles and Skeletal muscles

PART II

Plant Physiology

Note: Question No.8 is compulsory. Attempt any four questions from questions no. 9 to 13.

8. Attempt all parts:

Choose the correct alternative from the words given in brackets. (Answer any 2x 1/2

The CO2-acceptor molecule in Calvin cycle is (RuBP/PGA).

(Autoradiography/Chromatography) is used to trace the location of radioactive carbon in the cell organelles.

Symptoms of nitrogen deficiency appear in (young/older) leaves.

Fill in the blanks: 2x1=2

The cold treatment given to induce flowering is called .

The ability of any cell of a plant to give rise to a new plant is called .

Define the following terms 2xl=2

Photoperiodism

Endogenous rhythm

9. Define transpiration. Discuss anyone factor that determines the rate of transpiration. 3

Define stress in plants. Name any two factors that cause stress in plants. 2

10. Differentiate between macro and micro nutrients. Give two examples of each. Describe their role and deficiency symptoms. 5

11. With the help of Z-scheme diagram, trace the transfer of electrons from water to NADP+ during light reactions of photosynthesis. 5

12. With the help of a diagram, explain the Munch Pressure flow hypothesis for phloem transport. 3

Which group of plants possess root nodules Why are pink root nodules more efficient? 2

13. Write short notes on any two of the following: 2x 2 1/2

Phytochrome

Abscission

Role of hormones in agriculture