Category: KS3 Biology

KS3 Genetics and Reproduction

Plant Reproduction 

This section has a series of resources which focuses on the sexual and asexual reproduction of animals with 5 topic lessons

1 Intro to reproduction

2 Plant Reproduction / Structure

3 Pollination & Fertilisation

4 Seed dispersal

5 Asexual Reproduction

Reproduction Interactive Quiz

Genetics Interactive Quiz

Flower Dissection - Reproduction in flowering plants

Worksheet and posters:

Flower Structures and Functions: `
How to Draw a Flower:
Sexual and Asexual Reproduction Explained:
Advantages of Sexual and Asexual Reproduction:


Many species of plant contain both ...
the male and female parts within each flower.

The male part, the stamen, is comprised of the anthers at the top, supported by the filament. The anthers produce pollen which contains the male gamete.

The female part, known as the carpel, has a stigma at the top where pollen attaches, and the ovary at the bottom containing ovules, the female gamete. Between the ovary and stigma is the style.

Insect (also bird, bat…) pollinated flowers have attractive looking petals to attract animals, and also produce nectar (a sugar-rich liquid) which provide a food source for animals. They also have a strong scent.
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Animal Reproduction

This section has a series of resources which just focuses on the sexual reproduction of animals with 5 topic lessons

6 Male Repro Structure & Function

7 Female Repro Structure & Function

8 Fertilisation & Pregnancy

9 Birth and Pregnancy

10 Cloning

Life Before Birth - In the Womb

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“My chances are 50-50. Not great odds. And that’s only to get to the starting line. The human race is not for ...
the faint hearted, when half the runners are doomed to die, before the race gets started.”

This documentary film explores the development of the growing fetus from conception to delivery. Open a window into the hidden world of the foetus and explore each trimester in amazing detail. It’s meant to be a joyous event, but in reality, it's a gripping battle for survival. Using cutting edge technology, we go inside the womb and follow the incredible nine month journey from conception to birth, showing how the struggle for life turns into the miracle of birth. Enhanced by poet Roger McGough’s reading of a series of poems written for the occasion.

“Until now, I thought I was the universe. But everything that is, was within me. Now that I can touch these walls, I realise I must be deep inside a greater universe.”
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KS3 Ecosystems & Ecology

This section has a series of resources which focuses on food chains, webs and predator prey relationships of animals and plants with 6 topic lessons. The second PowerPoint is for a Tree and Leaf STEM identification project. It depends a lot on the trees around but we have a huge amount, so it was easy. You can edit and limit the outcomes but it’s great to do on a summer day.

1 Food Chains

2 Food Webs

3 Pyramids of Number and Biomass

4 Predator and Prey Adaptations

5 Predator and Prey Graphs

6 Extinct animals and conservation

7 Tree and Leaf Project

Interactive Quiz

GCSE Biology - Food Chains & Predator Prey Cycles #85

For ecosystems to function they need energy; and we can see how this energy moves through ecosystems with food chains. We also explore how the populations of predators and prey ...vary over time with predator prey cycles.[+] Show More

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KS3 Living Organisms

This section has a series of resources which focuses on breathing in humans and respiration in other organisms with 6 topic lessons. It can easily be expanded to 10 lessons with more practical time if required. 

Lesson 1: Structure of Thorax & Inhalation & Exhalation

Lesson 2: Gas Exchange Surface & Tidal and Vital Capacity

Lesson 3: Aerobic Respiration & Maggot Respirometer

Lesson 4: Anaerobic Respiration

Lesson 5/6: Making Yogurt, Bread and Beer

Interactive Quiz

Inside The Lungs

Inside The Lungs

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Why hasn’t the US eradicated the plague?

Why hasn’t the US eradicated the plague?

  • 15 October 2015
Dry gangrene, caused by the plagueImage copyrightScience Photo Library

It’s nearly 50 years since the US landed men on the moon, but Americans are still dying from a disease that ravaged Europe in the Middle Ages. Why hasn’t the US eradicated the plague?

The Black Death caused about 50 million deaths across Africa, Asia and Europe in the 14th Century. It wiped out up to half of Europe’s population.

Its last terrifying outbreak in London was the Great Plague of 1665, which killed about a fifth of the city’s inhabitants. Then there was a 19th Century pandemic in China and India, which killed more than 12 million.

But the disease has not been consigned to the dustbin of history. It is endemic in Madagascar, the Democratic Republic of Congo and Peru. What’s perhaps more surprising is that it is still killing people in the US.

There have been 15 cases in the US so far this year – compared to an average of seven, according to the Centers for Disease Control and Prevention (CDC) – and the figure of four deaths is higher than in any year this century.

Bar charts showing US plague cases and deaths from 2000 to 2015

The bacterium responsible – Yersinia pestis – was introduced to the US by rat-infested steamships in 1900, according to Daniel Epstein of the World Health Organization (WHO).

“Plague was pretty prevalent, with epidemics in Western port cities. But the last urban plague was in Los Angeles in 1925. It spread to rural rats and mice, and that’s how it became entrenched in parts of the US,” he says.

The disease – typically transmitted from animals to humans by fleas – has a 30-to- 60% fatality rate if left untreated, however, antibiotics are effective if patients are diagnosed early.

The plague

Plague bacteria, Yersinia pestisImage copyrightScience Photo Library
  • More than 80% of US cases have been bubonic plague, the most common form, which affects the lymph nodes and causes gangrene (see picture at top of page)
  • There are two other types, septicaemic, an infection of the blood, and pneumonic, which infects the lungs
  • It can be hard to identify the disease in its early stages because symptoms, which usually develop after three to seven days, are flu-like – a laboratory test can confirm diagnosis

Most cases occur in summer, when people spend more time outdoors.

“The advice is, take precautions against flea bites and don’t handle animal carcasses in plague-endemic areas,” says Epstein.

The areas in question are New Mexico, Arizona, California and Colorado, according to the CDC. All of this year’s cases originated in those states, or in other states west of the 100th meridian, which Dr Amesh Adalja, an infectious-disease specialist at the University of Pittsburgh’s Center for Health Security, refers to as “the plague line”.

“Prairie dogs are the main reservoir for plague, and they tend to be west of the 100th meridian,” he says. The geography and climate of the Western US suits them, he explains, and the fact that they are “social animals” helps the infected fleas to spread.

Prairie dog in CaliforniaImage copyrightGetty Images
Image captionYersinia pestis thrives in prairie dogs’ fleas

Black-footed ferrets and the Canada lynx are other particularly susceptible species, says Dr Danielle Buttke, an epidemiologist at the US National Park Service.

It’s the existence of this “animal reservoir” that makes the plague hard, if not impossible, to eradicate, experts say.

The only human disease eradicated so far, smallpox, does not exist in animals. It’s the same with polio, which remains endemic in two countries – Afghanistan and Pakistan. The WHO is working towards to eradicating polio and last month announced that it is no longer endemic in Nigeria. (It has, however, returned to Syria, since the civil war.)

“Unless we exterminate rodents, [the plague] is always going to be around,” Epstein argues.

California Department of Public Heath workers treat the ground to ward off fleas at the Crane Flat campground in Yosemite National Park, California, on 10 AugustImage copyrightReuters
Image captionPublic health workers treat the ground in Yosemite National Park to get rid of fleas

On the other hand, scientists at the National Wildlife Health Center have been working with parks to develop oral vaccines to protect black-footed ferrets and prairie dog – prairie dogs seem to prefer peanut butter-flavoured baits, research shows.

An injectable vaccine for black-footed ferrets has also been created. So maybe it will be possible to rid animals of the disease, at least in the most popular national parks.

Generally, research into the disease is in a “vibrant” state, according to Adalja, with scientists trying to improve ways of diagnosing it, and to develop an effective human vaccine.

The reason? The plague has been classified as a “category A bioweapon”, he says. An average of seven cases of plague per year is one thing, but the risk of biological warfare, even if it’s a remote one, is quite another.

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Pine smell ‘limits’ climate change

Pine smell ‘limits’ climate change

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Court orders girls’ MMR vaccination

Court orders girls’ MMR vaccination

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Can captive cubs help conservation?

Can captive cubs help conservation?

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Sea otter return boosts seagrass

Sea otter return boosts seagrass

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