chapter 38 angiosperm reproduction & biotechnology
Overview
The required reading for this chapter was all about flowering plants, their structure, and various functions regarding reproduction. Male gametophytes are produced in the anther and once the time is right, they are released. Pollen grains disperse through wind, water, or animals. Flowers have adaptations that attract animals like bright flower color or specific aromas. The animal and the flower may have a mutually beneficial relationship; nectar for the animal, pollination for the flower. Once a pollen grain attaches to the stigma of the flower's carpel, a pollen tube forms and leads the two sperm to the ovary. There, double fertilization occurs and the seed begins to form. Then, the fruit can form (usually from the ovary) and be dispersed to make a new plant. Mission accomplished!
The required reading for this chapter was all about flowering plants, their structure, and various functions regarding reproduction. Male gametophytes are produced in the anther and once the time is right, they are released. Pollen grains disperse through wind, water, or animals. Flowers have adaptations that attract animals like bright flower color or specific aromas. The animal and the flower may have a mutually beneficial relationship; nectar for the animal, pollination for the flower. Once a pollen grain attaches to the stigma of the flower's carpel, a pollen tube forms and leads the two sperm to the ovary. There, double fertilization occurs and the seed begins to form. Then, the fruit can form (usually from the ovary) and be dispersed to make a new plant. Mission accomplished!
Big Ideas
2.E.1 Timing and coordination of specific events are necessary for the normal development of an organism, and these events are regulated by a variety of mechanisms.
2.E.2 Timing and coordination of physiological events are regulated by multiple mechanisms.
Artifact
Plant stories --> students had to come up with a storyline about flowers and incorporate vocab.
Chapter 38 reading guide:
2.E.1 Timing and coordination of specific events are necessary for the normal development of an organism, and these events are regulated by a variety of mechanisms.
2.E.2 Timing and coordination of physiological events are regulated by multiple mechanisms.
Artifact
Plant stories --> students had to come up with a storyline about flowers and incorporate vocab.
Chapter 38 reading guide:
ch38_readingguide.pdf | |
File Size: | 903 kb |
File Type: |
Reflection
Writing the plant stories gave students the opportunity to apply their knowledge and be creative at the same time. Thinking of the flowers in "real" situations and making them interact with the environment helped students to better understand the structure and function of different parts of angiosperms. Plus, it was fun to come up with a story and illustrate our own book. The reading guide above, however, gave a much more comprehensive overview of terms and important concepts of the chapter.
Writing the plant stories gave students the opportunity to apply their knowledge and be creative at the same time. Thinking of the flowers in "real" situations and making them interact with the environment helped students to better understand the structure and function of different parts of angiosperms. Plus, it was fun to come up with a story and illustrate our own book. The reading guide above, however, gave a much more comprehensive overview of terms and important concepts of the chapter.
chapter 39 plant responses to internal & external signals
Overview
Chapter 39 is about the particular responses that plants have to light and their own chemical messengers. This chapter incorporates the concepts of chapter 11 into the physiology of plants. Plants exhibit tropisms, which are growth responses to external stimuli and plant hormones carry these responses out.
Auxins are very important hormones that stimulate growth and perform various other regulating activities. Cytokinins stimulate cell division, control apical bud dominance, and slow aging.
Gibberellins stimulate stem elongation, fruit growth, and germination.
Absicisic acid (ABA) inhibit growth hormones, inhibit germination, and prevent water loss in times of drought.
Ethylene gas promotes the triple response, senescence, leaf abscission, and fruit ripening.
The importance of light for plant success could not be overemphasized. Light receptors like blue-light photoreceptors and phytochromes absorb various wavelengths, which allows plants to recognize whether they should flower or not based on environmental factors, as well as other responses. The two forms of phytochromes regulate seed germination, control flowering, etc. Recognition of light is essential for the well-being of any plant. Of course, light is not the only stimulus that plants respond to. Gravity, objects, temperature, salinity, and other organisms also play central roles in the signal transduction pathways of plants and influence how they interact with their environment.
Big Ideas
2.D.4 Plants and animals have a variety of chemical defenses against infections that affect dynamic homeostasis.
2.E.2 Timing and coordination of physiological events are regulated by multiple mechanisms.
2.E.3 Timing and coordination of behavior are regulated by various mechanisms and are important in natural selection.
Artifact
View the reading guide and phytochrome below:
Chapter 39 is about the particular responses that plants have to light and their own chemical messengers. This chapter incorporates the concepts of chapter 11 into the physiology of plants. Plants exhibit tropisms, which are growth responses to external stimuli and plant hormones carry these responses out.
Auxins are very important hormones that stimulate growth and perform various other regulating activities. Cytokinins stimulate cell division, control apical bud dominance, and slow aging.
Gibberellins stimulate stem elongation, fruit growth, and germination.
Absicisic acid (ABA) inhibit growth hormones, inhibit germination, and prevent water loss in times of drought.
Ethylene gas promotes the triple response, senescence, leaf abscission, and fruit ripening.
The importance of light for plant success could not be overemphasized. Light receptors like blue-light photoreceptors and phytochromes absorb various wavelengths, which allows plants to recognize whether they should flower or not based on environmental factors, as well as other responses. The two forms of phytochromes regulate seed germination, control flowering, etc. Recognition of light is essential for the well-being of any plant. Of course, light is not the only stimulus that plants respond to. Gravity, objects, temperature, salinity, and other organisms also play central roles in the signal transduction pathways of plants and influence how they interact with their environment.
Big Ideas
2.D.4 Plants and animals have a variety of chemical defenses against infections that affect dynamic homeostasis.
2.E.2 Timing and coordination of physiological events are regulated by multiple mechanisms.
2.E.3 Timing and coordination of behavior are regulated by various mechanisms and are important in natural selection.
Artifact
View the reading guide and phytochrome below:
ch39_readingguide.pdf | |
File Size: | 1661 kb |
File Type: |
Reflection
This reading guide helped me to organize the information contained in this chapter. The questions created a way to quiz myself on the sections of the chapter. The concept of Pr and Pfr phytochromes was very confusing to me at first, but re-reading paragraphs and studying the images (such as the one above) was imperative to my comprehension of plant responses to light. Labeling figures and explaining steps in the reading guide for Chapter 39 made for great review of the info and much better understanding of key concepts.
This reading guide helped me to organize the information contained in this chapter. The questions created a way to quiz myself on the sections of the chapter. The concept of Pr and Pfr phytochromes was very confusing to me at first, but re-reading paragraphs and studying the images (such as the one above) was imperative to my comprehension of plant responses to light. Labeling figures and explaining steps in the reading guide for Chapter 39 made for great review of the info and much better understanding of key concepts.