taxila central college horana 12 biological...human digestive system tutorial 09 taxila central...

Asha Karunasena Taxila Central College

1. The living body contains a large number of small building units. This basic building unit is called

as ……………………………..

2. The structural unit of organism is ……………………………………………

3. The functional unit of organism is ……………………………………………

Contents

12.1 Organizational levels of life.

12.2 Systems of the human body.

Human respiratory system

Human digestive system

Tutorial 09

Taxila Central College – Horana

Grade 7

Unit 12 - Biological Processes

My dear students,

Refer unit 12 in your science text book.

Write down this note in your science exercise book.

Answer all the questions.


Activity 01

Observation of the cells in the lower epidermis of betel leaf and cheek cells of human.

(This activity will be done in the school laboratory after the vacation)

The structural unit of plant is

………………………… …………………………

The structural unit of animal body is

………………. …………………………

The microscopic view of the cells in the lower

epidermis of betel leaf

The microscopic view of stained human

cheek cells


Question

1. Some of the organisms made up of a single cell. They are called as unicellular organisms. The

figures given below show few unicellular organisms. Identify them.

2. Which organisms can be observed in a sample of water from a fresh water pond?

…………………………………………

3. Which organisms can be observed in water rotted with hay?

…………………………………………..

……………………………………………………… …………………………………………………… ……………………………………………….


Classification of organisms

Classification of organisms

(According to the organizational level in the body.)

e.g. e.g.

…………………………………………… …………………………………………

…………………………………………… …………………………………………

Organisms

Plants Animals Microorganisms

Organisms

Unicellular organisms Multicellular organisms

The body of these organisms is made up

of …………………………….Cell.

The body of these organisms is made up

of …………………………….Cell.


4. The flow diagram given below shows the organizational levels in a multicellular organism.

Complete the diagram by using suitable words.

A collection of different types of

tissues that works together to

perform a specific function or

functions.

The basic…………………………..and

the ……………………. unit of the life.

A group of cells, organized for a

specific function or functions.

A group of organs that has

organized to perform a specific

function or functions.

Organizational Levels in a

living body

Cell

………………………

………………………………

……………………………

Organism


Questions

I. Write down two features of a tissues.

………………………………………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………………………

II. State two features an organs.

………………………………………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………………………

III. Mention two features of a system.

………………………………………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………………………

IV. Identify the following animal tissues.

……………………………………………………………. ……………………………………………………..

……………………………………………………………. ……………………………………………………….


V. The figures given below show the sytems which are found inside human body.Identify

each system.


Organizational level in the plant

vi. There are two main systems in the plant as shown below. Identify them.

Activity 02

Items required

A plant like ‘balsam’/”Diya bulath” with a transparent stem, a vessel filled with coloured water(water

and a water soluable dye)

……………………………………

.

…………………………………………

…..


Conclusion

The tissue which is red in colour is …………………………… and it transports

……………………………………and ……………………………………………………

The plant tissues that are found in plants

Question

Complete the following table.

Name of the tissue Function

Xylem

Phloem


How do we get energy to do our works?

simple food

How is simple food

supplied to man?

How is oxygen supplied to

man?

We get energy to do our works by burning or reacting the simple

food that we take with oxygen.

oxygen Energy

By digestive system By respiratory system


Human digestive system

i. Mention two main functions of the human digestive system?

…………………………………………………………………………………………………………………………………………………………………

…………………………………………………………………………………………………………………………………………………………………

ii. There are the two types of digestion of food in human digestive system as shown below.

a) What are the two types of digestion of food in human digestive system?

………………………………………………………….. …………………………………………………………

b) What is the function of digestive juice?

…………………………………………………………………………………………………………………………………………………………………

…………………………………………………………………………………………………………………………………………………………………

iii. The figure given below shows the human digestive system. Name the parts a to l.


iv. Which part of the human digestive system performs the following functions?

Mechanical digestion of food

Chemical digestion

Secretion of saliva

Secretion of digestive juice

Storage of food

Absorption of water

Removal of faecal matter/faeces

v. What is the function of tongue?

…………………………………………………………………………………………………………………………………………………………………

…………………………………………………………………………………………………………………………………………………………………

vi. The following diagram shows a special process that can be seen in oesophagus when food is

pushed from moth to the stomach. Name the process.

……………………………………………………………

…………………

…………………

…………………

…………………

…………………

…………………

…………………

…………..


vii. The figures given below show finger like projections in the inner wall of small intestine.

a) What is the name given to these structures?

………………………………

b) What is the function of these structures?

………………………………………………………………………………

………………………………………………………………………………

………………………………………………………………………………


Human respiratory system

1. Study the following diagram.

i. Why do animals respire?

…………………………………………………………………………………………………………………………………………

…………………………………………………………………………………………………………………………………………

ii. Why do animals need energy?

…………………………………………………………………………………………………………………………………………

…………………………………………………………………………………………………………………………………………

iii. What are the by-products of respiration?

…………………………………………………………………………………………………………………………………………

iv. Complete the following flow diagram.

Respiration

Inhalation/Breathing in .............../.................


v. Name the parts which are labeled in the human respiratory system.

vi. What is the function of human respiratory system?

……………………………………………………………………………………………………………………………………………………

……………………………………………………………………………………………………………………………………………………

vii. What are the changes that take place in inhaled air inside the nasal cavity?

……………………………………………………………………………………………………………………………………………………

……………………………………………………………………………………………………………………………………………………


viii. a) Which structure is common to both digestive system and respiratory system?

……………………

b) Label the structure that you mentioned above in the following diagram.

ix. Study the figure given below and state the function of epiglottis.

………………………………………………………………………………………………………………………………..


x. Mention the function of the following structures.

Name of the structure Function

• Nasal cavity

• Cilia in the internal lining of nasal passage

• Trachea

• Alveoli

• Ribs

xi. The diagram below shows a model of human respiratory system.

a) Which part of the human respiratory system represented by the followings?

Bell jar ……………………………….

Y tube ……………………………….

Rubber balloons ……………………………….

Rubber balloon membrane ………………………………..

taxila central college horana 12 biological...human digestive system tutorial 09 taxila central...

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