418 EXAMINATION PAPERS 



3. Describe how tree trunks increase in thickness. As trees 

 increase in age what changes do the wood and bark undergo ? 



4. Give an account of the occurrence of root-nodules on the 

 roots of some plants. How are these nodules caused, and how 

 do they affect the life of the plant ? 



Section B 



5. [Obligatory) Describe an experiment to show that plants 

 exhibit root-pressure. How is this pressure produced, and of 

 what advantage is it to the plant ? What natural phenomena 

 in herbaceous plants are due to root-pressure ? 



6. Describe the method of water-culture to prove the 

 essential inorganic food-materials required by green plants. 



7. Draw the vertical section and floral diagram of the Wild 

 Rose, and name the parts of the section. Draw and describe the 

 leaf of the Rose. 



8. Give examples of varieties, hybrids, and double flowers, 

 and describe how each may be developed. 



INTERMEDIATE EDUCATION BOARD FOR IRELAND 



Examination 191 i (June) 



Special Paper (Fourth Year) 

 Section A 



1 . (Obligatory) What is respiration ? How may it be shown 

 that plants respire ? What is the use of respiration ? 



2. How would you proceed to find where the most rapid 

 growth in length of the root and stem takes place ? 



3. Describe the changes which take place in the endosperm 

 of a wheat-grain during germination. 



4. Mention some causes of bending and curvature in plants. 

 How do these causes affect the different parts ? Describe 

 observations illustrating your answer. 



Section B 



5. (Obligatory) A square is punched from a Sunflower 

 leaf before sunrise and carefully weighed. A similar square is 

 punched from a leaf after sunset, and its weight also recorded. 



