100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary Grade 8_Natural Sciences [NS] Summaries CA$9.94
Add to cart
Quickly navigate to
Preview
  2.  
  3. 8th Grade
  4.  
  5. Natural Sciences

Summary

Summary Grade 8_Natural Sciences [NS] Summaries

1 review
 4 purchases
  • Course
  • Natural Sciences
  • Institution
  • 8th Grade

'This Grade 8 Natural Sciences Noteset contains comprehensive summaries of all topics covered in the syllabus during Term 1 to 4. It is a must-have for any student looking to excel in their Grade 8 Natural Sciences exam. These notes are perfect for revision, helping students to quickly and accurate...

[Show more]

Preview 4 out of 42  pages

Document information

  • July 13, 2023
  • 42
  • 2022/2023
  • Summary

Subjects

  • grade 8 natural sciences

Written for

  • 8th Grade
  • Natural Sciences
  • 200
All documents for this subject (12)

1  review

review-writer-avatar

By: ashleighpienaar • 1 year ago

Seller

avatar-seller
notedx19

Reviews received

Content preview

natural Science

, Photosynthesis & Respiration
ENERGY > SUSTAINING LIFE:

→ energy need (to sustain life) = drives the interactions in ecosystems

All living things need energy for life processes:

Z Movement
Z Growth
Z Stay warm
[Sun = source of energy in ecosystems]

Z Light

Z Heat

[Plants = capture light energy > photosynthesis]


PHOTOSYNTHESIS:
→ chemical process during which plants glucose from carbon dioxide (from the air) and
water (from the ground) by using energy from the Sun;

[BYPRODUCT / BYPRODUCT = oxygen]




[Chlorophyll →green matter in plants that absorbs/captures the energy of sunlight]



GLUCOSE:
→ sugar > simplest form of food

→ Plants turn glucose into starch, cellulose and other chemical compounds [required for
growth and reproduction]




2© Noted Summaries Grade 8 Natural Sciences www.notedsummaries.co.za

, RESPIRATION:
ENERGY IN FOOD:

➢ Food contains potential energy

➢ Food's energy content is measured in kilojoules (kJ) OR kilocalories (kCal)

➢ The energy stored in food can be measured by burning a small amount of food in an
instrument called a calorimeter.

[Glucose = broken down → energy is used → used for bodily processes
[RESPIRATION]]

[RESPIRATION →process by which energy is released from glucose during
a series of chemical reactions]




RESPIRATION & BREATHING:

DIFFERENT WAYS OF BREATHING:

➢ Fish → gills

➢ Whales → holes on top of head

➢ Caterpillars → holes against body

➢ People → nasal cavities (air goes to lungs)



QUIIIIZZZZ!!!


WHY DO YOU BREATHE HARDER WHEN YOU EXERCISE?
➢ Respiration takes place in every cell of your body.
➢ When you jog or do exercises you need more energy.
➢ This means that respiration takes place faster and that you therefore need more
oxygen than usual.
➢ Your body automatically responds to the need for more oxygen by breathing
harder and faster.




3© Noted Summaries Grade 8 Natural Sciences www.notedsummaries.co.za

, Interactions & interdependence
ECOLOGY > INTERACTION:

[ECOLOGY → branch of the sciences that studies the interaction of
organisms with other organisms and their environment]

Ecologist > Person who studies these relationships and interactions



4 LEVELS > STUDY OF ECOLOGY:

→ group of organisms of the same species that are found in a
POPULATION specific area at a specific time and they must be able to breed in
that area
[population growth & factors affecting population growth or decline]
→all the populations of organisms that interact in a specific area
COMMUNITY [2 OR MORE POPULATIONS]
→communities' interaction with the non-living things in their
ECOSYSTEM environment
[community + habitat]
→all the ecosystems on Earth combine to form the biosphere
BIOSPHERE
ECOSYSTEMS > BIOTIC & ABIOTIC COMPONENTS:

BIOTIC ABIOTIC
[LIVE] [NON-LIVING]
Z Plants Z Temperature
Z Animals Z Sunlight
Z People Z Water
Z Wind
Z Sand


SURVEY METHODS > SIZE OF ECOSYSTEM:

SQUARE SURVEYS CROSS SECTION SAMPLING
→a square or grid for surveys →a line through the study area for sampling
[PLANTS / SLOW MOVING ANIMALS] [STATES OF ABIOTIC FACTORS
CHANGE]




4© Noted Summaries Grade 8 Natural Sciences www.notedsummaries.co.za

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller notedx19. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$9.94. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

68175 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
CA$9.94  4x  sold
  • (1)
Add to cart
Added