Indira Gandhi National Open University General IGNOU TEE JUNE 2020 Lse-06 (Developmental Biology) question paper model question papers

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Posted Date: 31 May 2021      Posted By:: Shubham Jain    Member Level: Silver  Points: 3 (₹ 2)

2020 Indira Gandhi National Open University General B.Sc Life science IGNOU TEE JUNE 2020 Lse-06 (Developmental Biology) question paper Question paper

Course: B.Sc Life science   University/board: Indira Gandhi National Open University

Are you preparing for the TEE of Ignou in the B.Sc. course ? Here is the question of Lse-06 (Developmental Biology) of TEE June 2020. Hope this will help you in your preparation and feel free to download it.

Q1. (a) Fill in the blanks:
(1.) Patches of secondary phloem embedded in secondary xylem are known as ………phloem.
(2.) Pollination between two flowers of same plant is called……………….
(3.) During microsporogenesis, …………... cells undergo meiotic division to form microspores.
(4.)………………. is an outgrowth near the micropyle which guides the pollen tube to micropyle.
(5.) Haploid plants obtained through culture of unfertilized ovules are called …………. haploids.
(6.) ………………. is a hormone which is involved in promoting ripening of fruits.
(b) Define any two of the following:
(i) Quiescent centre,
(iii) Aril, and
(iv) Double fertilization.
Q2. Write short notes on any two of the following:
(a) Saprophytic self-incompatibility,
(b) Egg apparatus,
(c) Abscisic acid, and
(d) Clonal propagation through tissue culture.
Q3. Write down two important differences between any two of the following:
(a) Cork-cambium and vascular-cambium,
(b) Generative cell and vegetative cell,
(c) Polygonum and Allium type of embryo-sac, and
(d) Somatic embryos and somatic hybrids.
4. What is dendrochronology? How are annular - growth rings formed in secondary xylem?
Q5. Define dormancy. What is its significance? Discuss briefly the various factors involved in seed dormancy.
Q6. (a) Write a brief note on importance of apomixis in agriculture.
(b) Draw a well-labelled diagram of longitudinal section of a mature dicot embryo.
Q7. What is entomophily? Describe the floral characteristics of entomophilous plants.

8. (a) Distinguish between the following:
(i) Alecithal and Mesolecithal eggs
(ii) Animal pole and Vegetal pole
(iii) Carcinoma and Lymphoma
(b) Fill in the blanks with appropriate words:
(i) Chemotaxis is the directed movement of cells in response to ……………. in solution.
(ii) Among the three germ layers in vertebrates the long and respiratory linings are the derivates of ……………….
9. (a) Distinguish between holoblastic and meroblastic cleavage with the help of suitable examples.
(b) Mention the names of hormones and their functions in the process of metamorphosis of insects.
10. Describe the spermatogenesis process in mammals.
11. What are the major derivatives of ectoderm? Explain the process of neurulation in amphibians, with suitable diagrams.
12. Describe the sequence of events in the process of regeneration of urodele limbs.
13. Give an account of human placenta and its functions.
14. Write note on any one of the following:
(i) Theories of cellular ageing
(ii) Stages of carcinogenesis
(iii) Embolic morphogenetic movements

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