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1. The technique of transplanting a part of one plant on to another is called (1Mark) 
(a) Cutting 
(b) Layering 
(c) Grafting 
(d) Gootee 

2. Anemophily refers to the pollination by (1Mark) 
(a) Wind 
(b) Water 
(c) Animals 
(d) Insects 

3. A typical angiospemric embryosac is 8-nucleate and (1Mark) 
(a) Single celled 
(b) Seven celled 
(c) Eight celled 
(d) Four celled 

4. Which of the is a start codon? (1Mark) 
(a) UAA 
(b) UAC 
(c) AUG 
(d) UAG 

5. An unorganised mass of cells produced by ex-plant is called (1Mark) 
(a) Callus 
(b) Embryoid 
(c) Somatic hybrid 
(d) Protoplast 

6. What is parthenogenesis considered as a special mode of reproduction in plants? (2Mark) 

7. Differentiate between autogamy and geitonogamy. (2Mark) 

8. State the two laws of thermodynamics to explain the flow of energy in an ecosystem. (2Mark) 

9. 
a. Draw a neat labelled diagram of the two-dimensional structure of t-RNA. 
Or (3Mark) 
b. Draw the chemical structure of ribose and deoxyribose sugar of nucleotides. 

10. What are single cell proteins? Write two significance of single cell protein. (3Mark) 

11. What are primary pollutants and secondary pollutants? Give examples. (3Mark) 

12. 
a. Explain the sequence of events during DNA replication. 
Or (3Mark) 
b. Explain the technique of DNA fingerprinting. 

13. 
a. What are cloning vectors? Describe the characteristics of a cloning vector. 
Or (5Mark) 
b. What are restriction endonuclease enzymes? Explain how restriction endonuclease enzymes are named. 

14. 
a. Define the term biodiversity. Enumerate the factors responsible for the loss of biodiversity. 
Or (5Mark) 
b. What is green house effect? Describe briefly the effects of global warming. 

PART-B 

1. At which stage, the implantation in uterus takes place? (1Mark) 
(a) 8-cell stage 
(b) Morula 
(c) Blastocyst 
(d) Late gastrula 

2. The sterilization in males is performed surgically by (1Mark) 
(a) Tubectomy 
(b) Vasectomy 
(c) Laparotomy 
(d) Hysterectomy 

3. A typical 1:2:1 phenotypic ratio in a monohybrid cross is a characteristic of (1Mark) 
(a) Incomplete dominance 
(b) Co-dominance 
(c) Law of dominance 
(d) Law of segregation 

4. The antibiotic penicillin in produced from (1Mark) 
(a) Bacteria 
(b) Fungi 
(c) Lichen 
(d) Algae 

5. Who coined the term ecology? (1Mark) 
(a) Odum 
(b) Ernst Haekal 
(c) Arthur Tansley 
(d) Darwin 

6. Differentiate between homologous and analogous organs. (2Mark) 

7. Give two important features of acquired immunity. (2Mark) 

8. Define biowar. Give two examples of biological agents. (2Mark) 

9. 
(a) What is pedigree analysis? List any two advantages 
Or (3Mark) 
(b) what are the similarities found between man and great apes on the basis of molecular studies? 

10. What is a transgenic animal? Give any two applications of transgenic animals. (3Mark) 

11. What is commensalism? Explain with the help of an example. (3Mark) 

12. 
(a) Define spermatogenesis. Explain in brief the various stages of spermatogenesis. 
Or (5Mark) 
(b) Give the full form of ART. Explain any four techniques used in ART. 

13. 
(a) What is cancer? Explain four ways of treating cancer. 
Or (5Mark) 
(b) What are biofertilisers? Explain how fungi act as a biofertiliser 

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