No. of Printed Pages: 12 ILSE-051
BACHEWR OF SCIENCE (B.Sc.) Term-End Examination 0091.4 December, 2016
LIFE SCIENCE
LSE-05 PHYSIOLOGY

Time: 2 hours Maximum Marks: 50
Note Use separate answer sheets for Part I and Part II. 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 6.

1. Differentiate between the following: 2x1=2

Acclimatisation and Acclimation

Artery and Vein

Fill in the blanks 4x1

The process by which food is broken down into simpler molecules is known as

The volume of air inhaled in one breath is called

Animals whose main excretory product is guanine are called

The located in the gills of marine teleost expel excess salt by active transport.

Expand the following: 2x1/2=1

PIH

MSH

2. What are pheromones Describe their functions. 4

Define parthenogenesis. 1

3. Explain the mechanism of gas exchange in gills. 4

Give the names of two marine animals who are filter feeders. 1

4. With the help of suitable diagrams, describe the mechanism of movements of cilia and flagella. 3

How is a nerve impulse conducted in a myelinated axon? 2

5. Describe the estrus cycle in rat. 4

What is feedback regulation of hormone secretion? 1

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

Protein Digestion

Action of Peptide Hormones

Male Accessory Sex Organs


PART II

Plant Physiology

Note Question no. 7 is compulsory. Attempt any four questions from questions no. 8 to 12.

7. Fill in the blanks in the following statements: 4x1=4

Excess use of fertilizers the water potential of the soil.

The element is required for the nitrogenase activity.

Quantum requirement of photosynthesis is the number of light quanta needed to evolve one molecule.

Level of hormone increases in a water-stressed plant.

Choose the correct option:

The movement of an anion along with ion across plasma membrane via the same transporter is called (antiport/symport).

The formation of (ethylene gas/auxin) in fruits hastens its ripening.

8. Write short notes on any two of the following: 2x2

Nitrate Reductase

Apical Dominance

Biological Clock

Photophosphorylation

9. List the criteria of essentiality of an element in the plants. 2

Describe the role of any two macronutrients in plants. 3

10. Describe the process of photorespiration in plants. 2

Diagrammatically show the path of electron from water to NADP+ during photosynthesis. 3

11. Describe nitrogen fixation in plants.

Discuss the process of senescence in plants.

12. Differentiate between any two of the following: 2x1

Diffusion and Osmosis

Osmotic pressure and Turgor pressure

Water potential and Chemical potential

Growth and Development

What is the role of phytochrome in plants?