• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Living things, Biology revision notes

Extracts from this document...

Introduction

Biology Point (1) Living things Mrs Nerg the 7 life processes: MOVEMENT REPRODUCTION SENSTIVITY NUTRITION EXCRETION RESPIRATION food + oxygen = carbon dioxide + water + energy. GROWTH Cells Plant cells: Nucleus, Chloroplast, Vacuole, Cell membrane, Cell wall, Cytoplasm Animal cells: Nucleus, Cell membrane, Cytoplasm CYTOPLASM: chemical reactions take place here these reactions help keep the cell alive. MITOCHONDRIA IN THE CYTOPLASM: Respiration takes place here. In the MITOCHONDRIAN respiration takes place to release energy from the food molecules. NUCLEUS: It contains instructions to make new cells; it also controls what the cell does. CELL MEMBRANE: it controls what goes in and out of the cell. It also gives the cell its shape. (it's a thin layer of skin.) VACOULE: It contains a liquid called cell sap (a large permanent vacuole.) CHLOROPLAST: It contains chlorophyll (which traps light for photosynthesis to take place.) CYTOPLASM IN PLANT CELLS: Contain starch grains CELL WALL: it's a tough cellulose cell wall that covers the thin layer of cell membrane and strengthens the cell. ...read more.

Middle

NERVE CELLS: Carry messages around the body. SINGLE CELLS: They are unicellular. AMOEBA: It lives in ponds and ditches. It moves by changing its shape. It pushes out pseudopodia. It feeds on smaller things like bacteria. They get taken into a food vacuole. They add an enzyme to break down the food. Oxygen is dissolved into the water around AMOEBA. It gets inside by diffusion. The waste substances diffuse out of Amoeba by diffusion as well. MANY CELLS: They are multi cellular. SPIROGRYA: It lives on the surface of a pond. The cells are all joined together by filaments. It makes its own food by photosynthesis because they contain a chloroplast. CELL SIZE: As the surface area: volume ratio increases the cell size decreases. This means multicellular cells have a slower rate of diffusion. HOW TO FIGURE OUT THE SURFACE AREA: VOLUME RATIO IS? 1cm 2cm 3cm A B C A) SA : VR 1x 1x6=6:1X1X1= 1cm 6:1 therefore 6 divided by 1 = 6 B) ...read more.

Conclusion

ROUND WORMS (long, they have a thread like body) SEGMENTED WORMS (their body divide into segments). CNIDARIANS (they have a sac like body, they have tentacles) MOLLUCSC (have a shell and a muscular foot) ENCHINODERMS (spiny skins and have a pattern of 5 parts). ANTHRAPODS: INSECTS (have a 3 part body, 3 pairs of legs and 2 pairs of wings) CRUSTACEANS (chalky exoskeleton) MYRIAPODS (have a segmented body and have many legs) ARACHNIDS (body in 2 parts, 4 pairs of legs). THE PLANT KINGDOM PLANTS: FERNS (They have strong stems, roots and leaves. They make spores).They have xylem in them. CONIFERS (needle like leaves. Their seed are made inside the cone). They make female and male cones instead of flowers. FLOWERING PLANT (They have flowers which make seeds). MOSSES AND LIVERWORTS (no proper roots or cells, they make spores and lose water) THE PROTISTS: They are unicellular (Protists) and they can be (algae) when they are multicellular. FUNGI: (Most fungi are saprophytes). They make spores. They are made up of thin threads called hyphae. BACTERIA: They haven't got a proper nucleus and they are microscopic. PARASITES: When something lives of another organism ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Living Things in their Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Living Things in their Environment essays

  1. Marked by a teacher

    Taxonomy is the branch of biology that deals with the identification and naming of ...

    5 star(s)

    Bacteria are also classified according to their staining properties. Microbiologists of this high-tech age are still grateful to Danish physician Christian Gram, who invented the gram-staining method in 1884. To gram stain, one must smear a sample of bacteria on a slide, soak it in a violet dye and then treat it with iodine.

  2. Animal behaviour and research into attitudes on animal testing.

    This may have resulted in them giving short answers, just so the interview could be done quickly. My results could have been more reliable if I asked more people. For question 2 Do you believe all animals have equal rights?

  1. : To investigate how the volume to surface area ratio affects the heat-loss rate ...

    For 1cm? of volume, there is 2cm? of surface area to lose heat from. The second diagram has a smaller volume to surface area ratio which means for every 1cm of volume there is less surface area for heat to escape from.

  2. cellular respiration

    There are two different types of plant respiration: 1. Respiration during photosynthesis 2. Respiration whilst germination Germination is the process whereby a seed emerges from a period of dormancy. Most seeds go through a period where there is no active growth. Germination is the point when the seeds start growing, developing roots and shoots.

  1. Monitoring an Organism

    In each group there will be 12 students monitoring 3 different primates for their class. 12 students will be divided into 3 groups to monitor chimpanzee, gorilla and bonobos. (36 students= 3 groups, 1 group= 12 students, 12 students= 3 primates, 1 primate= 4 students monitoring.)

  2. An Investigation into the water quality of the River Banwell in

    Compare the species found to charts and books. 7. Identify and record on data sheet the species found and the frequency. Method 2 1. Remove items/habitats from the bottom of the bed, for example a rock. The species will be caught into the current and directed into your net.

  1. Physical Geography Fieldwork On Box Hill

    As well as this the species diversity and height seem to be much larger at Little Alp as shown by Figure 4.3. I think that this huge difference in species diversity, and the fact that the taller plants are found at Little Alp is related to the slope being much greater.

  2. Literature Review on Germination of Orchid Seeds.

    Zettler and McInnis (1993)2 found that the mycorrhizae isolated from a species of Platanthera promoted germination of several North American orchids. However, Isotria medeoloides failed to germinate in vitro with fungal isolates and in the field with naturally occurring fungi.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work