Download Assignment Code: LSE-12/TMA-1/ 2006-07

LSE-12
ASSIGNMENT BOOKLET
2006-07
Bachelor Degree Programme in Science
(B.Sc.)
Plant Diversity-I
SCHOOL OF SCIENCES
Indira Gandhi National Open University
Maidan Garhi
New Delhi – 110 068
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Plant Diversity – I (LSE-12)
Assignments 1 to 3
2006-07
Dear Student,
As explained in the Programme Guide, you will have to do three Tutor Marked Assignments
(TMAs) for this elective course.
The instructions for doing the assignments are given in the Programme Guide under the Section 7.1
Assignments. Please read the instructions carefully before you start to work on the assignments.
Please submit your assignments as per the following details:
Assignment No.
Date of Submission
Where to Send
Assignment – 1
Within 6 weeks after receiving the
printed materials.
The Coordinator of your Study Centre.
Assignment – 2
Within 10 weeks after receiving the
printed materials.
The Coordinator of your Study Centre.
Assignment – 3
Within 14 weeks after receiving the
printed materials.
The Coordinator of your Study Centre.
Answer sheets received after the due date shall not be accepted.
Do retain a copy of your assignments responses.
We wish you good luck.
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Assignment – 1
(Based on Blocks 1A and 1B)
Assignment Code: LSE-12/TMA-1/ 2006-07
Maximum Marks: 100
1.
Identify the correct answers for the following:
i)
Life originated about:
a) 4.5 billion years ago
b) 3.5 billion years ago
c) 3.5 million years ago
ii)
In the following three domains of organisms, mitosis occurs in:
a) Bacteria
b) Archaea
c) Eukarya
iii) Which of the following algal groups possess chlorophyll a and d?
a) Chrysophyta
b) Xanthophyta
c) Rhodophyta
iv) Tracheids evolved during:
a) Devonian period
b) Silurian period
c) Cambrian period
v) The earliest vascular plant known from about 420 million years old sedimentary rocks is:
a) Cooksonia
b) Psilotum
c) Marchantia
(2×5)
2.
Indicate which of the following statements are True?
i)
The Endosymbiont Theory postulates that prokaryotes are descendants of once free
living mitochondria and plastids.
ii)
The structure and sequence of rRNA of archaebacteria are similar to bacteria.
iii) The various evidences reveal that plants are descendants of green algae.
iv) The algae belonging to the division Euglenophyta lack cell wall.
v)
3.
Some fungi form parenchymatous structures.
(2×5)
Fill in the blank spaces with appropriate words :
i)
In ……….……. type of fossilisation, impregnation of minerals take place inside the tissue.
ii) ……………………. bacteria live in hot, acidic and saline environment.
iii) The fungal partner in most of the lichens is from ………………… species.
iv) The walls of spores and pollen of land plants are made of ……………………, which is the
most resistant organic chemical.
v)
Bread mould belongs to the division …………………… .
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(2×5)
4.
Observe the figure 2.1 in Block 1A and write two characteristic features of the listed
organisms belonging to the three domains.
(10)
5.
Describe in ~500 words the unity in diversity of life on Earth.
(10)
6.
Prepare clear and labelled illustrations for the following:
a) Ultrastructure of cyanobacteria
b) Types of gametic fusion
c) Structure of an alga from division Phaeophyta
d) An algae containing heterocysts
7.
(5×4)
What are the differentiating aspects of the following?
a) Prokaryotic and Eukaryotic cell
b) Bryophytes and Pteridophytes
8.
(10×2)
Discuss the evolutionary relationships among the various fungal groups.
×
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(10)
Assignment – 2
(Based on Blocks 1B and 2)
Assignment Code: LSE-12/TMA-2/2006-07
Maximum Marks: 100
1.
Choose the correct answer from the given options:
i)
Which of the following algae is colonial in form?
a) Volvox
b) Oedogonium
c) Ulva
d) Ulothrix
ii)
Which of the following features is not a characteristic of blue green algae?
a) 70S ribosomes
b) Cell wall
c) Cell division by mitosis
d) Thylakoids
iii) The fusion of two gametes that are different in size and morphology is called:
a) Isogamy
b) Heterogamy
c) Anisogamy
d) Eugamy
iv) The red rot disease of sugarcane is caused by:
a) Sphaerotheca pannosa
b) Colletotrichum falcatum
c) Ustilago tritici
d) none of the above
v)
2.
The aerobiological study of fungi helps in:
a) isolation of useful chemical products
b) forecasting and preventing crop diseases
c) collecting mycorrhiza
d) none of the above
(25)
Identify the correct statements.
i)
Heterocysts are present only in some of the cyanobacteria.
ii)
Algal mass can be used in biogas plants for producing methane gas.
iii) A gametophyte is formed when two gametes unite together and produce a new
plant.
iv) Lichens reproduce only by vegetative and asexual reproduction.
v)
The dikaryotic condition is unique to fungi.
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(2×5)
3.
Fill in the blank spaces with appropriate words:
i)
The reproductive structures in Fucus are called …………………………………………….. .
ii)
The cell wall of a diatom consists of two overlapping perforated ……………………….….. .
iii) The fungal disease of sheep skin is called …………………………………………………… .
iv) The mycorrihza can solublise the insoluble mineral …………………….….. and thus make it
available to the plant.
v)
Lichen can be used as ……………….. of pollution.
(2×5)
4.
Describe in ~ 500 words the important uses of algae.
5.
Diagrammatically represent the different modes of sexual reproduction in algae and describe
each one briefly.
(10)
6.
With the help of clear and labelled illustrations describe the life cycle of Phytophthora
infestans.
7.
(10)
(10)
Prepare neat and labelled diagrams for the following:
i)
Cross-section of a lichen thallus.
ii) Formation of sporangiospores in fungi.
iii) Structure of the thallus of Fucus.
iv) Structure of Acetabularia
8.
(5×4)
Differentiate the following from each other.
a) Sporangia and Zygosporangia
b) Uredospores and Aeciospores
(10×2)
×
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Assignment – 3
(Based on Blocks 3 and 4)
Assignment Code: LSE-12/TMA-3/2006-07
Maximum Marks: 100
1.
Select the correct answer-choice for the following.
i)
The amphibians among the plants are:
a) Algae
b) Fungi
c) Bryophytes
d) Pteridophytes
ii) A sterile layer of cells which forms a jacket around gametes for their protection is
characteristic of:
a) Algae
b) Bryophytes
c) Pteridophytes
d) Both b and c
iii) In which of the following types of stele the centre is occupied by a pith?
a) Haplostele
b) Plectostele
c) Dictyostele
d) None of the above
iv) Which of the following pteridophyte(s) is/(are) heterosporous?
a) Selaginella
b) Lycopodium
c) Marsilea
d) Both a and c
v)
2.
The pteridophyte with xeromorphic and hydromorphic features and a unique vascular system
is :
a) Cyathea
b) Marsilea
c) Equisetum
d) Lycopodium
(2×5)
Which of the following statements are correct?
i)
In bryophytes the gametophyte is underground.
ii)
The simple primitive type of stele first evolved in the pteridophytes.
iii) Bryophytes do not possess vascular tissue.
iv) The gametophyte of a fern is a prominent green prothallus that spreads profusely on the
ground.
v)
Cyathea has a tree form.
(2×5)
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3.
Complete the following statements.
i)
Every cell of gametophyte of ………………….. can regenerate into a new plant.
ii)
In majority of the species of Lycopodium the ………………. bearing leaves are formed by
gradual transition of vegetative leaves.
ii)
The simplest kind of stele is present in ……………………. .
iii) The hanging archaegonia are found in …………………….. .
iv) Mosses are suitable packing material because they are not easily attacked by………………. .
(2×5)
3.
Draw the structure of the following:
i)
Sporocarp of Marsilea
ii)
Retort cells in Sphagnum
iii) Gemma cup in transverse section
iv) Prothallus of fern with reproductive organs
5.
(5×4)
Differentiate between the following:
i)
Microsporophyll and Megasporophyll
ii)
Apospory and Apogamy
(10×2)
6.
List the general characteristics of bryophytes, and write their prominent uses.
(5+5)
7.
Discuss the xerophytic and aquatic features of pteridophytes giving suitable examples.
(10)
8.
Briefly describe the development of gametophyte in Pteris.
(10)
×
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