photosynthesis makes food for the plant by converting carbon dioxide, water, and sunlight into carbohydrates & a leaf is a part of a plant & a leaf performs photosynthesis ->  leaves of plant make food by performing photosynthesis  leaves of plant make food by performing photosynthesis & a plant is missing leaves ->  the plant will make less food  the plant will make less food & a plant / living thing requires food for survival ->  the food the plant requires to survive will be less  the food the plant requires to survive will be less & the decrease of something required by an organism has a negative impact on the survival of the organism -> making less food has a negative impact on the plant