Definitions P (part 2) Click for each heading then for the answer Physics = phun

Phototropism Growth response of a plant to light Plant gets more light More photosynthesis happens More food for plant Grows bigger faster

Physical Change No new substance is made Usually easy to reverse Little or no energy needed Ice melting or gas condensing = examples

Physical Digestion Food is cut into smaller particles by chewing or grinding in mouth and stomach.

Periodic Table of Elements All elements arranged in order of atomic number – smallest to largest Designed by Mendeleev Periods Groups

Names of Groups Group One Alkali Metals Group Two Alkaline Earth Metals Group Eight (zero) Noble Gases Group Seven Halogens

Pitfall trap Used to trap small insects, spiders, slugs etc Jam jar in ground covered by stone.

Placenta (the afterbirth) Allows two-way transfer of substances between mother and child blood Blood of child and mother don’t mix together Leaves the uterus minutes after the baby is born – “after” “birth”

Plasma Liquid part of blood 90% water 10% dissolved substances

Plastics Man made materials made from crude oil Do not bio-degrade(rot) Pollution problem – so reduce, reuse, recycle

Pollution Adding unwanted waste material to the environment

Producer Plant that makes own food in Photosynthesis Starts off every food chain

Product The substance made in a chemical reaction ( e..g. hydrogen when acid and metal react) Or made when an enzyme acts on (changes) a substrate E.g. maltose is product of amylase working on starch

Protein Food type used for growth and repair Meat, fish, eggs are high in protein Test – add biuret solution (Blue) to sample RESULT changes from blue to lilac Conclusion Protein is present

Puberty Time when child gradually becomes sexually mature due to sex hormones Approx 10 – 15 years of age

Do I know it?? Phototropism Physical change Physical digestion Periodic Table of Elements Pitfall Trap Placenta Plasma Plastic Pollution Producer Product Protein Puberty