HW #38 - AP Biology Period 4 #22 Liem Nguyen 3/4/10...

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AP Biology Period – 4 #22 Liem Nguyen 3/4/10 Homework #38 ( 090313 ): Chapter 38 (due Friday 090313 ) Total points: 40 for Attempt on all questions Concept Map: 10 Points Chapter 38: Angiosperm Reproduction and Biotechnology Objectives Sexual Reproduction 1. In general terms, explain how the basic plant life cycle with alternation of generations is modified in angiosperms. Angiosperms: asexual/sexual Origination of agriculture: 10,000 years ago Genetically modified plants Lengthiness of time during modification The alternation of generations of angiosperms is either asexual or sexual. Humans have manipulated plants to produce better crops for humans and society since their origination 10,000 years ago. Plants were genetically modified through artificial selection and modifications. The length of time during plant modification has increased recently because of genetic modifications. All angiosperms have alternation of generation, but there are different patterns of it. 2. List four floral parts in order from outside to inside a flower. Four whorls of modified leaves: floral organs Attached to stem at receptacle Order of sepal, petal, stamens, carpels Sepal: green, rose bud enclosed with petals Petals: colorful, attract pollinator Stamens: made of anthers, filaments Carpel (pistil): stigma, style, ovary From outside to inside a flower, it consists of floral organs. All the floral organs are attached to the receptacle. They are arranged in the order where first is sepal, petal, stamens, and carpels. The sepal is green and looks like a rose bud because it is encloses petals. The petals are more colorful and attract wind pollinator through biotic pollination. The stamen consists of anthers and filaments. Finally, the carpel consists of stigma, style, and ovary. 3. From a diagram of an idealized flower, correctly label the following structures and describe the function of each structure: a. sepals
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b. petals c. stamen (filament and anther) d. carpel (style, ovary, ovule, and stigma) Sepals: protect/cover flower bud Petals: attract wind pollinators Stamen: male reproduction Carpel: female reproduction The sepals protect and cover the flower bud before it opens. The petals attract insects and other pollinators to the flower. The stamen is the male reproductive parts and the carpel is the female reproductive parts, consisting of stigma, style, and ovary. 4. Distinguish between: a. complete and incomplete flowers b. bisexual and unisexual flowers c. monoecious and dioecious plant species Complete flowers have all four basic floral organs Incomplete flowers lack one or more floral organs Most grass flowers lack petals Some grass flowers are sterile due to lack of stamens and carpels Bisexual flowers have both male and female reproductive organs Unisexual flowers are either male or female.
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HW #38 - AP Biology Period 4 #22 Liem Nguyen 3/4/10...

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