How plants absorb water?
Discuss and let us know
Maintaining Life
Plants and water
Root hair cells
Function: Provide a really big surface through which water and minerals ions can
be absorbed into the plants.
Plant roots absorb mineral salts including nitrates needed for healthy growth. For healthy growth
plants need mineral ions including: - Nitrate for producing amino acids which are then used to form
proteins. - Magnesium which is needed for chlorophyll production.
Steps: Water moves from the soil > Cell Wall > Cell Membrane > Cytoplasm
Task 1
Science Learner Book page 143: Question 1 and 2
Science Workbook: page 68 and 69
How water moves up the plant.
1) In the centre, there are some very special cells called xylem
vessels.
2) These are the water water transport system of the plant.
3) After water is absorbed > moves from outside to inside of the
cell > Xylem vessel in the centre of the root.
Xylem
-
Long
Tube like cells
Dead cells
Only cell wall and empty space left inside
Wood of a tree truck is made of xylem vessel. They carry water from the roots all
the way to the top of the tree
Transpiration
How water moves through leaves.
Steps:
1)
2)
3)
4)
5)
6)
7)
8)
When water arrives at the leaf, it moves out of the xylem vessels and into the
leaf cells.
The cells that have chloroplast use some of the water for photosynthesis.
Most of the water does not stay in the cell.
The liquid water in the cell soaks into the cellulose cell wall and then changes
to water vapour - it evaporates.
The water vapour diffuses into the air spaces between the cells.
These air spaces connect with the air outside the leaf through tiny holes in the
underside of the leaf- the stomata.
The water vapour can diffuse through these holes and into the air.
The loss of water vapour from leaves is called transpiration.
Plant cell
-
Contains a lot of water especially in the vacuoles.
Classwork: Science workbook 4.2 Transpiration
Complete page 74, 75, 76 and 77
Objectives:
1) To understand the kidney system
2) To identify the parts of the excretory
system
3) To understand and explain the flow of the
excretory system
4.3 Excretion in humans
1) Excretion is on the characteristics of all living things.
2) Excretion means getting rid of waste materials.
3) Excretion includes all the waste substance that
organisms make in their cells, plus any substance that
they have too much of that have been part of their body.
1) For animals and human beings:
- Carbon dioxide, which body cells make in
respiration
- Urea, waste substance that is made in liver cells
- Excess water that is not needed by the body.
Excreting urea
1) When we eat food, any proteins in the food are broken
down to smaller molecules inside the digestive system.
2) These small molecules go into the blood. The blood
transports them to the liver.
3) If we have more proteins than we need, the liver changes
the smaller molecules into urea.
1) Urea is a poisonous substance. It it builds up in the
body, it makes a person ill.
2) As soon as urea is made in a liver cell, it is taken away
from the liver in the blood.
3) The urea is removed from the blood by the kidney in the
excretory system.
4) This system is known as the renal system. Renal means
to do with the kidneys.
1) As the blood flows through the kidneys, the kidneys filter
the blood. They remove all of the urea from it.
2) The kidneys also remove access water from the blood.
The urea dissolves in the excess water. The solution made is
urea in water is called urine.
3) The urine made in each kidney flows down a tube called a
ureter.
4) This carries it to the bladder, which can store if for a while.
5) The urine can flow out of the bladder to the outside world
through another tube called the urethra.
Classroom task
Science workbook
Page 78 (please complete all)
Classroom task
Complete Science Learner Book
Page 158
Questions 1 - 3
Only write the answers
Objectives:
a) Understand the different nutrients that a person
needs to stay healthy.
b) Explain the diet of a pregnant women.
c) Describe the about fetal and fetus.
Diet
1) A good diet during pregnancy has a big effect on fetal health.
2) When a woman is pregnant, a woman needs to eat a balanced diet
(different nutrients).
3) She needs a little more than usual because some of the nutrients
that she eats are passed to the growing fetus.
What is fetal health?
Fetal health: the support you need for a healthy
pregnancy and delivery.
Protein:
1) Help the fetus to produce new cells and grow. So the mother is
able to must make sure she eats plenty of food containing
protein.
2) Keep muscles strong and working well.
3) Extra Haemoglobin- blood need to transport oxygen around
body and and give the fetus enough (Oxygen).
Carbohydrate:
1) Supplies energy
2) Glucose is carbohydrate and cells get their energy by
combining glucose with oxygen in respiration.
3) Both the mother and fetus required carbohydrate to obtain
sufficient energy.
Vitamins and minerals
Iron: needed to make haemoglobin
Calcium: helping the mother and baby to obtain strong
bones and teeth.
Vitamins: essentials for mothers to obtain during
pregnancy.
Keeping a fetus healthy
A healthy pregnancy:
1) For the first nine months of its life, a new human beings grows
inside a mother. During the 9 months, it is called a fetus.
2) A fetus is a baby before it is born.
3) A fetus in growing in its mother’s body.
Smoking cigarettes
Is smoking
healthy?
1) Tobacco contains carbon monoxide, nicotine and tar.
2) When a pregnant women is smoking, carbon monoxide
and nicotine diffuse from the blood into the fetus’s blood.
3) Carbon monoxide in the blood reduces the amount of
oxygen that haemoglobin can transport.
4) Nicotine is an addictive drug. It can damage blood vessels
so it is not good for developing fetus.
Recommendation(s) for pregnant women
1) She must stop smoking
2) She should avoid alcohol.
3) She should never take any illegal drugs or any
drugs which is not prescribed by the doctor.
4) Most doctors recommend that pregnant women
should not drink a lot of coffee or cola.
Classwork
1) Complete Science learner Book question
4.4 in page 167 in your exercise book.
2) Science workbook page 79 - 84