Strand 1 Living Things

Question 1

Why do we dissect Toadz and give some materials on dissecting a toad ?

Answer 1

We dissect a toad because its digestive system is similar to many animals and humans some of the materials that we need to dissect a toad is : toad, dissecting forceps and a scapel.

Question 2

What are some of the precautions we should take when dissecting a toad

Answer 2

Be careful not to cut too deeply because it may damage the heart or any other internal organs

Question 3

Why do we dissect the bottom side

Answer 3

Because the backbone is found on the top side

Question 4

What is the digestive system

Answer 4

It is the digestion system whereby foods are broken down into simpler forms for digestion

Question 5

What are the two types of digestion

Answer 5

Mechanical digestion – teeth grind and break up food into smaller pieces and it occurs in the mouth.

Chemical digestion( enzymes)– Breakdown of food into small simplest form that is suitable for absorption

Question 6

What is peristalsis

Answer 6

Wave like contraction that pushes food around

Question 7

Describe the movement of food through the tract

Answer 7

Ingestion – taking food in
Physical digestion – grinding up a food
Chemical digestion – breakdown of food
Absorption – simple molecules are absorbed
Assimilation – making new compounds from the absorbed molecules
Egestion – undigested food in removed

Question 8

The food test of starch glucose protein

Answer 8

Starch – (iodine solution used ) iodine solution is added .. positive results- bluish black negative - light brown

Glucose - ( benedicts solution or fehling solution used )small amount added n heat gently positive - brick red negative - light blue

Protein - (biuret solution used) several drops positive- purple negative- light blue

Question 9

Another name of walls of the alimentary canal and what is it

Answer 9

Another name for alimentary canal is small intestine and it acts as a Steve which means that it only allows small materials to pass through it

Question 10

How are molecules broken down into smaller molecules

Answer 10

By the visking tube which behaves like the walls of the intestine it has small holes and only glucose is able to pass through it is also known as semi permeable

Question 11

What is circulatory system, what is it made of?

Answer 11

The circulatory system carries digested food oxygen and water to the cells it is made up of blood ,blood vessels and heart

Question 12

Another name for red blood cells what is it made of and what does it do

Answer 12

Red blood cells are also known as erythrocytes end it is made up of haemoglobin which binds oxygen and gives blood its red color

Question 13

What is white blood cells what does it do

Answer 13

White blood cells are leukocytes and it provides protection against illness and diseases

Question 14

Platelets?

Answer 14

They are produced from red bone marrow and it helps blood to clot when the skin is cut

Question 15

Plasma?

Answer 15

Is 90% water and contains dissolved substances such as hormones waste materials and digested food

Question 16

Arteries? Veins? Capillaries?

Answer 16

Arteries carry blood away from the heart and contain blood under high pressure

Veins carry blood to the heart end it contains blood under low pressure

Capillaries joint arteries to veins and it has very low blood pressure and also it is where gas exchange takes place

Question 17

Heart?

Answer 17

The heart pumps blood around the body average heart pumps over 5 L of blood in the walls of the heart contains muscle fibers

Question 18

What are the two main circulation loops

Answer 18

The heart live in Loop and the heart body loop ( definition)

Question 19

What is the respiratory system

Answer 19

The main organ is lungs where oxygen is added to the blood and carbon dioxide is removed

Question 20

What is respiration

Answer 20

Gas exchange or process where by digested food is combined with oxygen to release energy that is needed by the body cells to carry out function

Question 21

What is the word equation for respiration

Answer 21

Glucose plus oxygen equals carbon dioxide plus water

Question 22

What is the lungs? And what is alveoli

Answer 22

Lungs are two sponge bags of tissue of tiny airspace is called alveoli

Alveoli Has very thin walls and has millions of tiny airspace

Question 23

Name the process of Inhaling in the process of exhaling

Answer 23

Inhaling – diaphragm muscles pull the diaphragm downwards increasing the volume in the Thorax

Exhaling- muscles between ribs relax and thorax returns to its original shape or size

Question 24

The comparison of expired and inspired air

Answer 24

Oxygen – inspired air equals 21%, expired air equals 16%

Carbon dioxide – inspired air equals 0.04%, expired out equals 4%

Nitrogen - inspired air equals 78%, expired out equals 78%

Temperature – inspired and equals variable, expired air equals always high

Question 25

What is the Excretory system

Answer 25

Excretion – the removal of waste from the body example CO2 and urea

Question 26

The organs responsible for excretion

Answer 26

Kidneys and lungs

Kidneys remove nitrogen is waste and urea from the body where as long as remove carbon dioxide from the blood

Question 27

Describe how the human kidneys look like and where is it located and what does it do

Answer 27

Human kidneys are shaped like being structures and it. Is located in the area behind the back and it produces urine which is a yellowish fluid

Question 28

Material tht move out during filtration

Answer 28

Glucose, salt, water, urea

Question 29

Materials reabsorbed

Answer 29

All glucose, some salt

Question 30

Materials excreted

Answer 30

Urea, excess salt, excess water

Question 31

What is the human reproduction?

Answer 31

Production of offspring’s

Question 32

What happens in reproduction

Answer 32

The sperm from the male parent unites with the egg from the female parent

Question 33

What is fertilization

Answer 33

Men’s p***s release semen into a woman’s vagina

Question 34

What is the male Gamete and the female gamete

Answer 34

Male gamete is the sperm and the female gamete is the egg

Question 35

What is an endometrium

Answer 35

It is a blood and tissue lining in the uterus and it builds up in a woman’s body every month

Question 36

What is ovulation

Answer 36

Release of a matured egg from the ovary

Question 37

When does a woman ovulate

Answer 37

Every 28 days

Question 38

What happens in ovulation

Answer 38

Egg slowly travels down the oviduct for a few days

Question 39

Where does the sperm enter

Answer 39

They enter the uterus through cervix and travels to the oviduct

Question 40

When does a woman give birth

Answer 40

After nine months when the wall of the uterus contract pushing out the baby

Question 41

What is puberty n between what ages does it occur

Answer 41

Puberty is the changes that happens to a female and a male between the ages of 10 n 15

Question 42

Changes that happened to boys and girls during puberty and change that happening boys and changes that happened in girls

Answer 42

General knowledge Parizah

Question 43

What is the function of the female reproductive system

Answer 43

Give birth, produce eggs/carry babies

Question 44

Function of the male productive system

Answer 44

Produce male hormones and produce sperm