Goa Board Class 12 Question Paper Mar 2018 Biology Vocational _New Pattern_

*V292* 2018 III 08 1000 Seat No. : Time : 2 Hours BIOLOGY (Vocational) (New Pattern) Subject Code V 2 9 2 Total No. of Questions : 5 (Printed Pages : 2) Maximum Marks : 50 INSTRUCTIONS : i) All questions are compulsory. ii) Figures to the right indicate full marks. iii) Solve new question on fresh page. iv) Draw diagrams wherever specified. 1. A) Define the term adaptation. [1] B) Live leeches were used to prevent clotting of blood in post operation cases. Why ? [1] C) A fruit seller wants to ripen the banana bunches. Name the growth regulator he can use. [1] D) How do auxin promote plant growth and development ? [2] E) Give an account of various leaf modifications. [5] OR E) Describe the various tap root modifications with one example each. [5] 2. A) A small palm like tree with cones is seen growing in school premise. Identify the species. [1] B) Write two points of differences between gymnosperms and angiosperms. [1] C) Explain how light and wind affect the rate of transpiration. [3] D) State the distinguishing features of order ‘Lepidoptera’. [5] OR D) State the distinguishing features of order ‘Coleoptera’. [5] V-292 -1- P.T.O.

*V292* 3. A) What is ‘geitonogamy’ ? [1] B) The scientific name of mango is Mangifera indica. What does the first word Mangifera and second word indica denote ? [1] C) How do zoological parks help in preserving animals facing threat of extinction ? [1] D) Draw a neat diagram of “vertical section of epigynous” flower. [2] E) Describe the distinguishing features of molluscs. [5] OR E) Describe the distinguishing features of class ‘insecta’. [5] 4. A) Explain the term ‘scavenging’. [1] B) Construct the terrestrial food chain using any four organisms given below. [1] Algae, Paddy Plant, Kingfisher, Snake, Falcon, Rat. C) On a newly exposed sea floor, only few simple and very hardy organisms are surviving, what is it called as ? [1] D) Draw a neat diagram of ‘moss plant’. [2] E) Why is it advisable to plant different plant species while reforestration of a area ? [2] F) Explain the role of minerals and humidity in ecosystem. [3] 5. A) Name the bacteria that reduce nitrate to molecular nitrogen. [1] B) Draw a neat diagram of ‘chloroplast’. [1] C) Write the deficiency symptoms of zinc. [1] D) Nepenthis plant growing in nutrient deficient soil without showing any deficiency symptom. Why ? [2] E) Distinguish between cyclic photophosphorylation and non cyclic photophosphorylation. [2] F) Explain how carbon is exchanged between living organisms and non living world. [3] ______________ V-292 -2-