Sexual Reproduction In Plants
Visão Geral
A flower is a plant's reproductive factory. Behind the petals that catch your eye is a precise arrangement of male and female parts whose job is to bring two sex cells together and make a seed. Learn to name those parts and say what each one does, and a cut flower stops being decoration and becomes a machine you can read.
In this lesson you will identify every part of an insect-pollinated flower, give each its function, and see how a wind-pollinated flower is built differently for a different delivery method. You will define pollination precisely, separate self-pollination from cross-pollination, and weigh up what each means for the future of a whole population.
Objetivos
- Identify in diagrams and images and draw the following parts of an insect-pollinated flower: sepals, petals, stamens, filaments, anthers, carpels, style, stigma, ovary and ovules
- State the functions of the structures listed in 16.3.1
- Identify in diagrams and images and describe the anthers and stigmas of a wind-pollinated flower
- Distinguish between the pollen grains of insect-pollinated and wind-pollinated flowers
- Describe pollination as the transfer of pollen grains from an anther to a stigma
- [Supplement] Describe self-pollination as the transfer of pollen grains from the anther of a flower to the stigma of the same flower or a different flower on the same plant
- [Supplement] Describe cross-pollination as the transfer of pollen grains from the anther of a flower to the stigma of a flower on a different plant of the same species
- [Supplement] Discuss the potential effects of self-pollination and cross-pollination on a population, in terms of variation, capacity to respond to changes in the environment and reliance on pollinators
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Parabéns por concluir a lição em Sexual Reproduction In Plants. Agora que você explorou o conceitos e ideias-chave, é hora de colocar seu conhecimento à prova. Esta seção oferece uma variedade de práticas perguntas destinadas a reforçar sua compreensão e ajudá-lo a avaliar sua compreensão do material.
Irá encontrar uma mistura de tipos de perguntas, incluindo perguntas de escolha múltipla, perguntas de resposta curta e perguntas de redação. Cada pergunta é cuidadosamente elaborada para avaliar diferentes aspetos do seu conhecimento e competências de pensamento crítico.
Use esta secção de avaliação como uma oportunidade para reforçar a tua compreensão do tema e identificar quaisquer áreas onde possas precisar de estudo adicional. Não te deixes desencorajar pelos desafios que encontrares; em vez disso, vê-os como oportunidades de crescimento e melhoria.
- Which part of a flower produces pollen? A. stigma B. anther C. ovary D. sepal Answer: B
- Pollination is best defined as the transfer of pollen grains from: A. one ovary to another B. an anther to a stigma C. a stigma to an ovule D. a petal to a sepal Answer: B
- Which feature is typical of a wind-pollinated flower? A. large brightly coloured petals B. nectar to attract insects C. feathery stigmas hanging outside the flower D. sticky spiky pollen grains Answer: C
- Pollen carried from an anther of one plant to the stigma of a different plant of the same species is an example of: A. self-pollination B. cross-pollination C. fertilisation D. germination Answer: B
- Which set correctly lists the parts of a carpel? A. anther, filament, pollen B. stigma, style, ovary C. sepal, petal, receptacle D. ovary, anther, stigma Answer: B
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