LSE-12
PLANT DIVERSITY-1
Bachelor in Science Programme
(B.Sc.)
ASSIGNMENT
(Valid from January 1, 2011 to December 31, 2011)
Please Note
•
You can take electives (56 to 64 credits) from a minimum of
TWO and a maximum of FOUR science disciplines, viz.
Chemistry, Life Sciences, Physics, and Mathematics.
•
You can opt for elective courses worth a MINIMUM OF 8
CREDITS and a MAXIMUM OF 48 CREDITS from any of these
four disciplines.
•
At least 25% of the total credits that you register for in the
elective courses from Chemistry, Life Sciences, and Physics
disciplines must be from the laboratory courses. For example, if
you opt for a total of 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 registering for the course. Otherwise, your 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
(For January 2011 Cycle)
Dear Student,
You are required to do one assignment for this elective course. The instructions for doing
the assignment are given in the Programme Guide under the Section 7.1 – Assignments.
Please read the instructions carefully before you start to prepare your assignment
response.
•
You are required to submit your assignment response within fourteen weeks
of the receipt of this assignment to the Coordinator of your Study Centre.
•
Please retain a copy of your assignment response for your record.
We wish you good luck
Course Team (Plant Diversity-1, LSE-12)
Credit: commons.wikimedia.org
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Assignment
Assignment Code: LSE-12/TMA/2011
Max. Marks: 100
1. Write the technical term for the following:
i)
Naming of plants by generic and specific terms.
ii)
Fossils formed by layers of calcareous blue-green algae.
(1x5)
iii) A special cell in some filamentous blue-green algae that is the site of nitrogen fixation.
iv) The division of a plant cell perpendicular to the surface of the organ.
v) The upper surface of a leaf.
2. Write short notes on the following:
i)
Treatment of waste water with the use of algae
ii)
Role of fungi in maintaining soil fertility
(5x4)
iii) Knowledge about plants gained by research on bryophytes
iv) Biological significance of heterospory
3. Make clear, bold and labelled diagrams of the following:
i)
Basic types of cell cycles in algae
ii)
Fruiting structure of edible mushroom
(5x5)
iii) Foliose form of lichen
iv) Retort cells in a branch of Sphagnum
v)
Types of steles
4. Answer the following questions.
i)
Write five differences between the prokaryotic and the eukaryotic organisation of cells.
ii)
Why are the cyanobacteria of great evolutionary interest?
(5x6)
iii) State the characteristics of isogamous, anisogamous and oogamous fusion in algae.
iv) Describe the algal-fungal partnership in lichens.
v)
Why are the bryophytes considered as the amphibians of the plant kingdom?
vi)
Mention the features common between the bryophytes and the pteridophytes.
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5. Answer any two of the following:
i)
(10x2)
List the various divisions of algae and describe giving examples the salient
characteristics of each division.
ii)
Write the name of the pathogen of loose smut of wheat.
Describe the symptoms,
disease cycle and control measures of this disease with the help of a diagram.
iii)
Describe the salient features of sexual reproduction in bryophytes.
iv)
Prepare a detailed account on the formation of fossils. Describe the different types of
fossils.
LSE-12 (2011)
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