Life Cycles
Presentation
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Biology
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5th - 6th Grade
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Medium
Anonymous Anonymous
Used 11+ times
FREE Resource
34 Slides • 15 Questions
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Life Cycles
•Understand that all organisms have different life cycles
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What is a life cycle?
•The different stages an animal or plant goes through during its life.
can you think of any examples?
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Plant life cycles
Plants are able to reproduce in two different ways - sexual reproduction and asexual reproduction.
Sexual reproduction involves pollen from one flower fertilising the egg of another to produce a seed.
Only one parent is needed in asexual reproduction and the offspring are exact copies.
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Sexual reproduction in plants
Sexual reproduction in plants happens in a cycle-like pattern. Flowers come from seeds, and they create seeds too. All flowering plants go through the following life cycle.
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Germination
This is the process by which a plant begins to grow from a seed. Roots form under the soil. The stem, leaves and flower emerge above the soil.
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Pollination
Pollen produced by a flower is carried by insects or blown by the wind to another flower. This process is called pollination.
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Fertilisation
When the pollen reaches another flower, it travels to the ovary where it fertilises the egg cells to make seeds. This process is called fertilisation.
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Dispersal
These seeds are scattered by animals or the wind. This process is called dispersal. Some of the seeds will grow into new plants.
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Asexual reproduction
Some plants can also reproduce without an egg cell being fertilised to produce a seed. Instead, these plants produce an identical copy of themselves.
Some plants produce bulbs, like daffodils and snowdrops. Others, like potatoes produce tubers. These sit under the soil and develop into new plants the next year.
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Human Life Cycle
•The human life cycle has six main stages:
•foetus, baby, child, teenager, adult and being elderly.
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1. Foetus
At this time, a baby is growing inside its mum's uterus.
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2. Baby
A baby is born after spending nine months inside the womb.
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3. Childhood
At this stage, you learn to walk and talk.
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4. Adolescence
Children become teenagers.
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5. Adulthood
Your body is fully developed.
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6. Old age
The last stage in the life cycle of a human.
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1. ELEPHANTS: 640-660 DAYS
Elephants are pregnant for a long time. Like really, really long. At an average of 95 weeks, the gestation period is more than double the length of a human pregnancy, female elephants don't often have more than four offspring during their lifetimes.
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GIRAFFE: 14-15 MONTHS
Baby giraffes can weigh more than 150 pounds and can be around 6 feet tall. Giraffes give birth standing up, so it's pretty normal for a baby to fall 6 feet to the ground.
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Opossum: 11-13 days
An average litter consists of 8-9 infants. The infants are so small at birth that 20 could fit into a teaspoon and weigh approximately 0.13 grams. At birth, the infants must make a difficult journey from the birth canal into the pouch, latch onto a teat, and continue their development.
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Hamsters: gestation lasts from 16 to 22 days,
Normal litters contain 6 to 8 pups, and offspring are weaned after about 21 to 28 days. The pups are hairless and their eyes and ears are closed; however, pups have their front teeth (incisors) at birth.
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Open Ended
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Human Gestation
Human gestation lasts for roughly 280 days - (40 weeks) (9 months)
Usually 1 child is born
Twins and triplets are not unusual.
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Open Ended
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Frill shark: 3.5 - 4 Years!!
Although it has no distinct breeding season, the frilled shark produce a litter of 2–15 shark pups.
The frill shark are ovoviviparous - eggs hatch inside the mother and live young are born.
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Metamorphosis:
Amphibians, like frogs and newts, have a slightly more complicated life cycle.
They undergo a metamorphosis (a big change):
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The stages:
they are born (either alive from their mother or hatched from eggs)
they spend their childhood under water, breathing with gills
they grow into adults and move to the land, breathing with lungs
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Complete Metamorphosis: Insects
egg: unborn stage
larva: young stage -- this is when most of the feeding is done. (they usually look like worms)
pupa: inactive (no feeding) stage between larva and adult stages.
adult: final, breeding stage.(they usually grow wings)
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These insects have three stages in their life cycle:
egg: unborn stage.
nymph: young stage -- this is when most of the feeding is done.
adult: final, breeding stage - including wings.
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Life Cycles
•Understand that all organisms have different life cycles
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