Abscisic acid (ABA) is a plant hormone that influences the growth and development of plants. Salicylic acid (SA) is a plant hormone that interacts with other plant hormones, such as ABA, to influence growth and development in plants. Scientists investigated the effects of ABA and SA on shoot growth in seedlings of rice, Oryza sativa. The scientists germinated some rice grains and divided the young seedlings into four batches, A to D, each containing 9 seedlings of the same length. The seedlings were put into trays containing a seedling growth medium. The shoots in each batch of seedlings were sprayed once with a different solution: batch A - water batch B – 2 µmol dm-³ ABA batch C – 2 µmoldm¯³ ABA + 1.0mmoldm¯³ SA batch D - 1.0 mmol dm-3 SA The seedlings were then put into a growth chamber with constant conditions of light, temperature and humidity. The length of the shoot on each seedling was measured one day after spraying and five days after spraying. Fig. 2.1 shows two seedlings taken at random from each batch five days after being sprayed. [Figure 2.1] The mean results of the investigation are shown in Fig. 2.2. [Figure 2.2]