LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.
FIRST SEMESTER – APRIL 2011
PB 1505/PB 1502 – PLANT DIVERSITY – I (ALGOLOGY, MYCOLOGY, BRYOLOGY)
Date : 19-04-2011 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART – A (20 marks)
Answer ALL questions
- Choose the correct answer: ( 5 x 1 = 5 marks)
- Match [A] Cyanophyceae[B] Chlorophyceae [C] Phaeophyceae [D] Bacillariophyceae
[i] Chloroplast [ii] Frustule [iii] Laminarin [iv] Prokaryotes
(a) A –iv, B-i, C-iii, D- ii (b) A- i, B- ii, C –iii, D- iv
(c) A- iv, B-iii, C– ii, D –i (d) A – iii, B – ii, C – iv, D – i
- Statement A – Ectocarpus has heterotrichous condition.
Statement B – The gametophyte of Ectocarpus produces haploid zoospores.
(a) Statement A is incorrect and B is correct (b) Statement A is correct and B is incorrect
(c) Both statements are correct (d) Both statements are incorrect.
- Pick the odd one out based on mode of nutrition
(a) Rhizopus (b) Neurospora (c) Saccharomyces (d) Puccinia
- Statement A – Polyporus is commonly called the bracket fungus
Statement B – The pore surface is lined by the hymenium
(a) Statement A is incorrect and B is correct (b) Statement A is correct and B is incorrect
(c) Both statements are correct (d) Both statements are incorrect.
- Peristome aids in spore dispersal in
(a) Marchantia (b) Anthoceros (c) Albugo (d) Funaria
- State whether the following statements are TRUE or FALSE : ( 5 x 1 = 5 marks)
- Red algae are predominantly marine in distribution.
- Anabaena is a heterocystous cyanobacterium.
- Ascogenous hypha is monokaryotic.
- Albugo causes white rust disease in wheat.
- The sporophyte of Anthoceros is independent.
III. Complete the following: ( 5 x 1 5 marks)
- Oogamous sexual reproduction is characterized by non motile —————-and motile ————–.
- Volvox reproduces asexually by specialized cells called—————-.
- Dolipore septum is seen in the hypha of ————– group of fungi.
- Red rot of sugarcane is caused by ———————- ————–.
- Sex organs of Marchantia are borne on —————— and ——————.
- Answer the following, each within 50 words only : ( 5 x 1 = 5 marks)
- List any four characteristic features of Rhodophyceae.
- Comment on the structure of the diatom cell.
- How are fungi equipped for heterotrophic nutrition?
- Mention the components of lichen thallus and the function of each partner.
20.Why are bryophytes called the amphibians of plant kingdom?
PART- B
Answer the following, each answer within 500 words; Draw diagrams wherever necessary.
(5 x 7 = 35 marks)
- (a) How do algae reproduce by asexual means ?
OR
(b) Draw and describe the prokaryotic cell structure in blue green algae.
- (a) Describe sexual reproduction in Vaucheria.
OR
(b) Describe the thallus of Polysiphonia.
- (a) Bring out different groups of fungi based on mode of nutrition.
OR
(b) Give an account of the asexual reproduction in Fungi.
- (a) How does Neurospora reproduce asexually ?
OR
(b) Explain the structure of Polyporus basidiocarp.
- (a) Draw labelled diagram only of the internal structure of Funaria capsule. Add a note on spore
Dispersal.
OR
(b) Describe the internal structure of Anthoceros gametophyte.
PART – C
Answer any THREE of the following, each within 1200 words. Draw diagrams wherever necessary.
(3 x 15 = 45 marks)
- What are the various life cycle patterns encountered in algae? With suitable examples, give the
scheme and explain any one.
- Give a detailed account of the economic importance of algae, including information from all the
groups you have studied.
- Describe the structure of fruiting bodies formed in fungi.
- Describe the life cycle of Puccinia graminis.
- Give a comparative account of the gametophyte of Marchantia and Funaria.
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