Download LSE-05_ 2008_09

LSE-05
ASSIGNMENT BOOKLET
Bachelor’s Degree Programme in Science
(B.Sc.)
PHYSIOLOGY
ASSIGNMENT
(Valid from January 01, 2009 to December 31, 2009)
Please Note:

You can take electives (56 or 64 credits) from a minimum of TWO and
a maximum of FOUR science disciplines, viz. Physics, Chemistry, Life
Sciences and Mathematics.

You can opt for elective courses worth a MINIMUM OF 8 CREDITS
and a MAXIMUM OF 48 CREDITS in any of the four Science
disciplines.

At least 25% of the total credits that you register for in the elective
courses from Life Sciences, Chemistry and Physics disciplines must be
from the laboratory courses. For example, if you opt for a total 64
credits of electives in these 3 disciplines, at least 16 credits should be
from lab courses.

You cannot appear in the Term-End Examination of any course
without getting registered for the same. Otherwise result will not be
declared and the onus will be on you.
SCHOOL OF SCIENCES
Indira Gandhi National Open University
Maidan Garhi
New Delhi – 110 068
PHYSIOLOGY (LSE-05)
ASSIGNMENT
2009
Dear Student,
As explained in the Programme Guide, you will have to do this assignment for the Physiology Course, which
consist of two parts, Part-I is for Animal Physiology and Part-II is for Plant Physiology. This Assignment is
Tutor Marked (TMA).
The instructions for doing the assignments are provided in the Programme Guide under Section 7.1
Assignment. You should read the instructions carefully before you start doing these assignments.
Please note that:
(i)
This assignment is valid from January 01, 2009 to December 31, 2009
(ii)
However, we strongly suggest that you should send your response to this assignment, to the Study
Centre Coordinator within fourteen weeks of the receipt of this booklet in order to get the feedback
and comments on the evaluated assignment,
(iii) However, in any case, you have to submit the assignment response before appearing in the term end
examination.
We strongly suggest that you retain a copy of your assignments.
Wishing you all good luck.
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ASSIGNMENT
Course Code: LSE-05
Assignment Code : LSE-05/TMA/2009
Max. Marks: 100
PART I
1.
2.
a) Why are certain amino acids called essential amino acids? Describe the physiological
importance of the following minerals: sodium, potassium calcium and phosphorous.
(1+4)
b) Draw a well labelled diagram of the human respiratory system. Also explain with the help
of a figure the process of gas exchange inside the lungs.
(2+3)
a) Differentiate between myogenic and a neurogenic heart.
b) Define cardiac output, stroke volume and pulse rate. How is cardiac output increased
during exercise?
3.
4.
5.
6.
(1)
(4)
a) With the help of a diagram of mammalian kidney describe the structure of vertebrate kidney.
How does the structure of vertebrate kidney differ according to the habitat of the animal?
(3)
b) The body fluids of marine teleosts are hypertonic to sea water. Explain how they are maintain
their salt balance.
(2)
a) Describe with help of a well labelled diagram the initiation of muscle contraction.
(5)
b) What is controlled hypothermia? How is this phenomenon useful for animals?
(5)
a) Draw a labelled diagram of a section of mammalian ovary showing all the stages.
(2)
b) Name the hormones secreted by the testis. What are their functions in the body?
(3)
a) Define in a few lines each of the following:
i) Neurotransmitters
ii) Synapse
iii) Post synaptic potential
iv) Temporal summation
v) Monosynaptic reflex arc.
(25)
b) How do hormones act on their target cells? Explain with the help of diagrams the
action of peptide hormones.
(1+4)
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PART II
7.
i) What would happen if a twig of a potted plant is cut into two pieces and joined with tygon tubing
in such a way that it leaves an air gap between the cut ends? Will water continue to move?
ii) Draw and describe the structure of stomata, and explain its opening and closing
8.
i) List the evidences for the involvement of two light reaction instead of one in photosynthesis.
ii) Describe the principle features of Photosystem I and Photosystem II in detail and draw the
modern version of ‘Z’ scheme.
9.
10.
(2+3)
(5)
(3+2)
Differentiate between
(45)
i) Macro and Micro nutrients
ii) Describe the importance of Calcium and Copper in plant nutrition.
iii) List the theories proposed for the mechanism of translocation in phloem and describe any one of them.
iv) What is the role of leghaemoglobin in nodules?
Describe the characteristics of all the plant hormones you have studied.
11. i) What are the biological responses controlled by phytochrome
ii) List the ways by which plants adapt stress and describe any one method you think is important.
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