Growth and Development Which of the following situations

Growth and Development

Which of the following situations constitute growth a) The increase in size of the protoplasm of a plant cell placed in water b) A teenaged human gains 2 kg in 4 months c) A plant gains weight immediately after a heavy shower of rain d) A plant increases in height by 2 cm in 2 years e) A copper sulphate crystal increases in size f) A dehydrated camel gains weight and increases in volume after taking a long drink of water

Distinguish between Growth and Development After fertilization of an egg, what is the first process which occurs? Do all the cells remain alike after division? Make a list of the processes which contribute to growth and development of a multicellular organism. State briefly what occurs during each process. - HW

MEASURING GROWTH Dimension Unit symbol Length/height of stems cm or mm Length of roots cm or mm Fresh weight of animals g or kg Dry mass of plants g Surface area of leaves cm 2 Number of leaves during the life of a plant

Measuring Growth - considerations Advantages and disadvantages of the methods listed – HW due 4 Feb 2013 Growth measurements must be made at suitable intervals of time over a known period. What would be a suitable interval for each of the dimensions mentioned in the table?

GROUP WORK In pairs answer the following questions: a. What is the importance of including units used? b. List the limitations of the method you are investigating. Record your results in a table/graph if necessary

Class tasks 1. Measuring length/height: find the average height/foot size, middle finger length etc. for the class. 2. Measure surface area: measure the surface area of the palm of your hand. 3. Fresh mass: measure the mass of potted plant in the school yard

CHANGES IN MASS OF A GIRL FOR THE FIRST 18 YEARS OF LIFE. AGE/YEARS Birth 1 2 WEIGHT/KG 3. 3 9. 9 12. 3 AGE/YEARS 10 11 12 WEIGHT/KG 31. 9 36. 1 39. 9 3 4 5 6 7 8 9 14. 4 16. 5 18. 6 22. 0 24. 0 26. 4 30. 1 13 14 15 16 17 18 45. 1 49. 3 52. 1 53. 1 54. 4 54. 9

Next Class! Using the graph drawn answer the following questions: 1. 2. 3. 4. 5. 6. 7. What was the girl’s weight at age 10? What was her weight at age 15? What is the time interval between 10 and 15? How much weight did the girl put on in this time interval? Therefore what was her average rate of growth between age 10 and age 15? What was the growth rate of the girl in the first year of her life after birth? What was the growth rate of the girl for the period before birth?

Planning and Design Lab Investigate the effect of water availability on growth rate of germinating seedlings