Science Double Award - 4SD0 PearsonEdexcel

Reproduction

Gbogbo ọrọ náà

From the pollen drifting off a grass flower to the development of a human baby, reproduction is the process that keeps every species alive. It comes in two fundamentally different forms, and the choice between them shapes everything from genetic diversity to the speed at which a population can grow.

In this lesson you will compare sexual and asexual reproduction, trace the journey from pollination to seed formation in plants, explore how the human reproductive systems work, and see how hormones control the menstrual cycle. You will also learn how the placenta and amniotic fluid protect the developing embryo.

Ebumnobi

Understand the differences between sexual and asexual reproduction
Understand that fertilisation involves the fusion of a male and female gamete to produce a zygote that undergoes cell division and develops into an embryo
Describe the structures of an insect-pollinated and a wind-pollinated flower and explain how each is adapted for pollination
Understand that the growth of the pollen tube followed by fertilisation leads to seed and fruit formation
Investigate the conditions needed for seed germination
Understand how germinating seeds utilise food reserves until the seedling can carry out photosynthesis
Understand that plants can reproduce asexually by natural methods and by artificial methods
Understand how the structure of the male and female reproductive systems are adapted for their functions
Understand the roles of oestrogen and progesterone in the menstrual cycle
Describe the role of the placenta in the nutrition of the developing embryo
Understand how the developing embryo is protected by amniotic fluid
Understand the roles of oestrogen and testosterone in the development of secondary sexual characteristics

Akọmọ Ojú-ẹkọ

Every organism exists because its parents reproduced. Some species clone themselves rapidly; others invest months in a single offspring, mixing genes to produce variation that helps the species survive changing conditions. The trade-offs between these strategies are central to biology.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Reproduction. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

Which of the following is a feature of asexual reproduction? A) Two parents are required B) Gametes fuse at fertilisation C) Offspring are genetically identical to the parent D) Meiosis produces the sex cells Answer: C
In a wind-pollinated flower, the stigma is typically: A) Small and sticky, inside the flower B) Large and feathery, hanging outside the flower C) Brightly coloured to attract insects D) Covered in nectar Answer: B
Which three conditions are needed for seed germination? A) Light, water and warmth B) Water, oxygen and warmth C) Light, oxygen and carbon dioxide D) Water, carbon dioxide and warmth Answer: B
What is the function of the placenta during pregnancy? A) To produce amniotic fluid B) To allow exchange of substances between maternal and embryonic blood C) To store the embryo's food reserves D) To produce sperm and egg cells Answer: B
Which hormone is responsible for maintaining the uterus lining after ovulation? A) Testosterone B) Oestrogen C) Progesterone D) Adrenaline Answer: C