What is a plant? -- What is a seed? -- Do all seeds grow into new plants? -- How does a seed sprout? -- Which part of a plant grows first? -- Do all plants make seeds? -- How do leaves help a plant survive? -- Why do leaves come in so many sizes and shapes? -- Why do plants need stems? -- Why are the stems of trees covered with bark? -- How do roots help a plant survive? -- What is a plant's secret weapon? -- Which animals spread plant pollen? -- How do animals protect plants? -- Why do some flowers smell bad? -- What happens to a flower after it's pollinated? -- Why do some fruits taste so good? -- Do all seed-making plants produce flowers and fruit? -- How do pine trees make seeds? -- A pine tree's life -- Do all plants lose their leaves in cold weather? -- Does a plant ever stop growing? -- A flowering plant's life.