The process by which plants lose water through leaves is:

**The reasoning** Plants have tiny pores on their leaves called **stomata** (singular: stoma). These pores open to allow gas exchange — carbon dioxide comes in for photosynthesis, and oxygen goes out. But here's the key: when stomata open, water vapor also escapes into the atmosphere. This process of water loss through the leaves is called **transpiration**. Think of it like sweating for plants — water evaporates from the leaf surface and exits through the stomata. It's not just loss though; transpiration actually helps pull water up from the roots through the stem to the leaves (like sucking through a straw). **Why the wrong options tempt you** - **Respiration** involves breaking down glucose to release energy (happens in all living things, including plants, but doesn't specifically describe water loss) - **Photosynthesis** is how plants *make* food using sunlight, water, and CO₂ — water is used here, not lost to the air - **Osmosis** is water movement across membranes from high to low concentration — it's *how* water moves *within* the plant, not how it exits the leaves **Quick takeaway** "Transpiration = water vapor exits through stomata on leaves; it's the plant's cooling and water-transport system."