SCIENCE TEST 1- ANSWERS
QUESTION 1
The human skeleton has three main functions:
.a. protect the important organs in our body ( such as heart-lungs-brain)
.b. help us to move around.
.c. support our body and give it shape and form.
QUESTION 2
The main bones in a human skeleton:
.a. the skull
(the head)
.b. the ribcage
(the chest)
.c. the backbone with vertebrae
(the back)
.d. the humerus
(the forearm)
.e. the radius and ulna
(the arm)
.f. the femur
(the upper part of the leg)
.g. the tibia and fibula
(the lower part of the leg)
.h. the pelvis
QUESTION 3 ..the joint between arm and forearm: elbow
..the joint between forearm and hand: wrist
..the biggest joint in our body: knee
..the joint between leg and foot: ankle
QUESTION 4
Our bones grow as we grow. Bones grow longer and stronger as the body
develops throughout the years.
QUESTION 5
cats – chicken
have skeletons
Jelly fish - snails
do not
QUESTION 6
..when we move our forearm upward there are two muscles which help
the bones in our arm accomplish such movement:
the Biceps and the Triceps.
..as the forearm moves upward the biceps CONTRACTS
while triceps RELAXES. When the forearm moves downward the biceps relaxes and the
triceps contracts. This is how Muscles work IN PAIR to make our bones move.
QUESTION 7
.. One special muscle in our body which works on its own without us having
to move any bones attached to it, is the HEART.
It works throughout our lifetimes, when it stops working we just stop living.
QUESTION 8
..when you break a leg it is put into CAST for some time so that the broken
bone MENDS itself. The cast helps the leg stay still to allow the crack mend.
..after the recovery your leg looks thinner because the muscles have not
been working for quite a while, so they shrank! When muscles do not work ( no exercise no
efforts) they shrink.
QUESTION 9
..HABITAT is the place where a specific kind of living organism ( plant or
animal) lives. It is its HOME.
..Savannahs (or grasslands) are HABITATS for lions cheetahs and zebras.
There are a few trees some lakes and grass.
Seas and oceans are habitats for whales sharks and different kinds of
fish. There is some vegetation and some rocks.
..If you take one of these animals and put it in a different habitat
(changing its home) this animal will not be able to survive. Animals need their own
surrounding because they ADAPT to it. They know where and how to get the food they
need. They know where to hide and where to find friends from their own species.
Plants too ADAPT to specific kinds of SOIL and weather conditions. If you move a plant to
another habitat it might not survive the new type of soil (too dry or too wet) it might not
stand the new weather conditions.
..Children forearm bones are longer than teenagers forearm bones and
teenagers forearm bones are longer than adults forearm bones BECAUSE our bones grow
AS WE GROW. While we grow our body needs stronger, longer and bigger bones:
- for a better protection of our important organs
- for a stronger support of the body
QUESTION 5
..animals with a skeleton: chicken -
cats
..animals without a skeleton: jellyfish - snail
QUESTION 6