BACHELOR OF SCIENCE (B.Sc.) Term-End Examination June, 2015 LIFE SCIENCE LSE-06 : DEVELOPMENTAL BIOLOGY
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1 No. of Printed Pages : 12 LSE E1E3 BACHELOR OF SCIENCE (B.Sc.) Term-End Examination June, 2015 LIFE SCIENCE LSE-06 : DEVELOPMENTAL BIOLOGY Time : 2 hours Maximum Marks : 50 Note : Answer Part I and Part II in separate answer copies. Answer the questions as per instructions in each part. Draw labelled diagrams, wherever necessary. PART I (Plants) Note : Question no. 1 is compulsory. Attempt any four questions from questions no. 2 to 7. All questions carry equal marks. 1. (a) Fill in the blanks : 2 light absorbing forms. exists in red and far-red (ii) Pollen wall consists of two layers, outer and inner LSE-06 1 P.T.O.
2 (b) Select the correct word given in the parenthesis : 2 Formation of fruit without fertilization is called (parthenocarpy/polyembryony). (ii) (Animal/Plant) cells are totipotent. (c) State whether the following statements are True or False : 1 The source of Gibberellin is a fungus. (ii) Commercial cork is obtained from Quercus suber. 2. Define any five of the following technical terms : 5x1=5 (a) Abscission (b) Apomixis (c) Incompatibility (d) Exalburainous seed (e) Callus (1) Double fertilization 3. (a) What is vivipary? Which group of plants show this characteristic feature and how is it useful to them? (b) How are the plants classified based on their day length requirement to flower? LSE-06 2
3 4. Write short notes on any two of the following : 2x2-1 =5 2 (a) Organisation of shoot apical meristem (b) Self- and Cross-pollination (c) Applications of tissue culture (d) Structure of a mature embryo sac 5. (a) List the five plant growth regulators and discuss the role of any one of them. 3 (b) Where are the following tissues located and what are their functions? Tapetum (ii) Endothelium (iii) Endosperm (iv) Epistase 6. (a) Draw a labelled diagram to show the passage of pollen tube from the stage of germination of pollen grain on the stigma till its entry into the ovule. (b) Describe the structure and functions of the wall layers of an anther. 2 OR What components of pollen wall cause allergenic reactions in humans? 2 LSE-06 3 P.T.O.
4 7. (a) With reference to vascular cambium, answer the following questions : This is present in which group of plants? (ii) What is its location? (iii) What are its constituent cell types? (iv) What are the products and results of its activity? (b) Which part of the seed/fruit is useful in groundnut and cotton? 2 LSE-06 4
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