chapter 15

4. the openings on the lower epidermal layer that let gases in and out of the plant
8. a plant hormone that helps stimulate the ripening of fruit
10. Grain forms form tissue in a male reproductive structure of a seed plant
12. plants that flower when exposed to 12 or more hours of darkness
14. any change in an organism's environment that causes a response
16. plant hormone that increases the rate of cell division and cell elongation
17. Hormones substances that act as chemical messengers within plants
18. occurs when pollen grains land on a female reproductive structure of a plant that is the same species as the pollen grains
20. a plant's response to the number of hours of darkness in its environment
22. made up of an embryo, its food supply, and a protective covering
23. plant hormone that slows the aging process of flowers and fruits
24. a response that is results in plant growth toward or away from a Phototropism/growth of a plant toward or away from light
25. the daughter cells produced form haploid structures
26. vascular tissue that transports water to all parts of the plant

1. vascular tissue that transports liquid sugar to all plant cells
2. contains one or more ovules
3. plants that flower no matter what the sunlight is
5. hormone that generally cause increased plant growth
6. the female reproductive structure of a seed plant where the haploid egg develops Embryo/an immature diploid plant that develops from the zygote
7. when a plant grows in response to touch
9. a series of chemical reactions that convert light energy, water, and carbon dioxide into the food-energy molecule glucose and give off oxygen
11. Respiration a series of chemical reactions that convert the energy in food molecules into a useable form of energy called ATP
13. of generations occurs when the life cycle of an organism alternates between diploid and haploid generations
15. the response of a plant to gravity
17. growth of a plant toward or away from light
19. plant structure that contains one or more seeds; develops from the ovary and sometimes other parts of the Gibberellins plant hormone that increases the rate of cell division and cell elongation
21. plants that flower when exposed to less than 10-12 hours of darkness
22. the male reproductive organ of the flower Pistil/the female reproductive organ of a flower