Which two factors are most likely to cause a plant's guard cells to open its stomata? A. Increased gravitational pull I
B. Increased sunlight
C. Increased rainfall
D. Increased turgor pressure

the correct answers are B and D

the increased sunlight will determine the guard cells to start photosynthesis, this will result in an incresed glucose concentration inside the guard cells .The increased glucose concentration will cause osmotic pressure to build up, so the guard cell will absorb water from neighbouring cells, this will cause increased turgor pressure that will deform the cells in order for the stomata to open

i believe the answer is a or 1

where is the scientific experiment?