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Posted Date: 03 Jun 2021 Posted By:: Shubham Jain Member Level: Silver Points: 3 (₹ 2)
2020 Indira Gandhi National Open University General B.Sc Life science Ignou Tee 2020 Lse-12 (plant diversity 1) June session question paper Question paper
Are you currently in the BSc course of Ignou with biology stream and looking for the previous year question papers? Here is the end of your search. This is the Previous year question paper of Lse 12 (plant diversity 1). Feel free to download it and if you have any queries comment me down.
Note: All the questions in this Section are compulsory.
Q1 Fill in the blanks: [5 marks]
(a) The heterocyst of cyanobacteria fix _________
(b) ____________ capsule shows continuous growth due to the presence of
(c) Agar is mostly obtained from ___________.
(d) The individual cells formed by the breaking of a hypha are called _________
(e) Species restricted to a country or an area are called__________ .
Q2. Which of the following statements are True and which are False? [5 marks]
(a) Coleochaete is a terrestrial alga.
(b) Midrib is lacking in Sphagnum leaves.
(c) Fungi which grow on the leaves of plants are called mycorrhiza fungi.
(d) Psilotum is one of the earliest living land plants.
(e) Palmella stage is found in Volvox.
Q3. Match the items of Column A with the most appropriate items of Column B: [5 marks]
Note: Answer any six questions. All questions carry equal marks.
Q4. With the help of diagrams, explain evolution by endosymbiosis. [5 marks]
Q5. Discuss the role of bryophytes as indicator of mineral deposits. [5 marks]
6. Draw well labelled diagrams of any two of the following
(a) L. S. of strobilus of Selaginella
(b) T. S. of female conceptacle of Fucus
(c) Ultrastructure of eukaryotic cell
7. Differentiate between the following:
(a) Synangium and sporangium
(b) Plano gametic copulation and gametangia copulation
Q8. Describe sexual reproduction in Funaria. [5 marks]
Q9. Write short note on any one of the following: [5 marks]
(a) Aerobiology of fungi
(b) Use of algae for waste water treatment
Q10: How do bryophytes resemble pteridophytes? Give at least five points. [5 marks]
Q11. Write a short note on mycorrhizal fungi. [5 marks]
Q12. Write briefly about algal associations. [5 marks]
Section—C Note: Answer any three questions. All questions carry equal marks.
Q13. What are fossils? Describe different types of fossils on the basis of the nature of fossilisation. [10 marks]
Q14. Describe the various adaptations of bryophytes to land habit. [10 marks]
Q15. Explain the various types of steles in vascular plants. Comment on their evolutionary trends. 10 16. Name the causal organism of late blight of potato. Write its symptoms and draw a well labelled diagram of the disease cycle. [10 marks]
17. Describe the importance of lichens. [10 marks]
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