Biology - 4BI1 PearsonEdexcel

Reproduction

Gbogbo ọrọ náà

Every organism on Earth exists because its parents reproduced successfully. Some species clone themselves with remarkable speed, while others invest months in courtship, pregnancy and parental care. Understanding how new individuals are made - whether by splitting a cell in two or by fusing specialised sex cells - is central to biology and to many of the medical, agricultural and conservation questions you will meet later in the course.

In this lesson you will compare sexual and asexual reproduction, trace the journey from pollination to seed dispersal in flowering plants, and follow human fertilisation through pregnancy to birth. You will also explore how four hormones orchestrate the menstrual cycle - a topic that Edexcel tests regularly across both papers.

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 (illustrated by runners) and by artificial methods (illustrated by cuttings)
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
Understand the roles of FSH and LH 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

A strawberry plant sends out runners and colonises an entire garden bed in a single summer - no partner required. A blue whale, by contrast, carries a single calf for almost a year before giving birth in warm tropical waters. Both strategies work, but they produce very different kinds of offspring with very different chances of surviving environmental change. Reproduction is one of the defining characteristics of life, and the way an organism reproduces shapes everything from its genetics to its ecology.

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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 the correct definition of fertilisation? A) The transfer of pollen from anther to stigma B) The release of an egg from the ovary C) The fusion of a male gamete nucleus with a female gamete nucleus D) The implantation of an embryo in the uterus wall Answer: C
In the menstrual cycle, which hormone triggers ovulation? A) FSH B) Oestrogen C) Progesterone D) LH Answer: D
Which of these is NOT a condition required for seed germination? A) Water B) Light C) Oxygen D) Warmth Answer: B
What is the role of the stigma in a flower? A) To produce pollen grains B) To protect the flower bud C) To receive pollen grains during pollination D) To attract insects with nectar Answer: C
How many chromosomes does a human zygote contain? A) 23 B) 44 C) 46 D) 92 Answer: C