Kerala Syllabus Class 6 Basic Science: Chapter 06 Tiny Chambers of Life - Questions and Answers
ഈ ബ്ലോഗ് അഡ്മിൻറെ രേഖാമൂലമുള്ള അനുമതിയില്ലാതെ ഈ ബ്ലോഗിൽ നൽകിയിരിക്കുന്ന ചോദ്യോത്തരങ്ങൾ, ഇതേരീതിയിലോ പി.ഡി.എഫ് രൂപത്തിലോ, മറ്റേതെങ്കിലും ഡിജിറ്റലോ, പ്രിന്റഡ് ഉൾപ്പെടെയുള്ള ഏതെങ്കിലും രൂപങ്ങളിലേക്കോ മാറ്റി മറ്റൊരു വെബ്സൈറ്റിലോ, ബ്ലോഗിലോ, യുട്യൂബ്, സോഷ്യൽ മീഡിയാ ഗ്രൂപ്പുകളിലോ ഉൾപ്പെടെ ഒരിടത്തും പ്രചരിപ്പിക്കാൻ പാടില്ലാത്തതാകുന്നു.
Std 6: Basic Science Chapter 06: Tiny Chambers of Life - Questions and Answers
♦ What are Cells?
• Our body is built up of basic units called cells.
• They are the basic units of all living things.
• The human body is made up of millions of cells.
♦ We cannot see cells with our naked eyes. What could be the reason? Which device did you use to observe it?
• Cells are very tiny. They cannot be seen using a hand lens.
• We use a microscope to observe things that cannot be seen by naked eyes.
♦ Observe the given picture and record the parts of the microscope.
• Objective lens
• Stage
• Knobs
• Clips
• Condenser
• Mirror
♦ Write an experiment to observe the cells taken from the cheek.
• Materials Required: Toothpick, slide, methylene blue stain, cover glass
• Procedure: Rinse the mouth thoroughly with clean water. Gently scrape the inside of the cheek using toothpick. Cheek cells get attached at the tip of the toothpick. Place these cheek cells at the centre of the slide. Add a drop of methylene blue stain to it. Place a cover glass over it. Place the slide on the microscope and observe.
• Observation: Cheek cells are visible as in the figure.
♦ Observe the cheek cell and write down the parts.
• Cytoplasm
• Nucleus
♦ Write an experiment to observe the cells in onion
• Materials Required: Onion, blade, forceps, needle, watch glass, safranine
stain, glycerine, pure water, cover glass, tissue paper, slide
• Procedure: Take a thin layer from a cleaned onion using forceps. Cut it into small pieces and put it in a watch glass containing dilute safranine stain. After some time, take two or three pieces of stained onion from the watch glass and place it in another watch glass containing pure water. Take one piece from pure water and place it in glycerine on the slide. Place a cover glass over this with the help of a needle. Wipe off excess glycerine with tissue paper. Observe the prepared slide under the microscope.
• Observation: Onion cells are visible, as in the figure
• Materials Required: Microscope, cover glass, water boiled with hay and cooled, water collected from pond/paddy fields, spoon
• Procedure: Pour some water collected from pond/paddy field into the water boiled with hay. Keep it for four or five days. Take a drop of water from this water sample on a slide. Place a cover glass over it and observe it under the microscope.
• Observation: Some microorganisms, as shown in the picture, can be observed.
Unicellular organisms are organisms that have only one cell. As the number of cells is less, we cannot see them with naked eyes.
♦ Name some Unicellular Organisms.
• Paramecium
• Amoeba
• Euglena
♦ What are Multicellular Organisms?
An organism whose body is made up of more than one cell is a multicellular organism. We can see multicellular organisms with naked eyes as they have numerous cells.
♦ Give examples of Multicellular Organisms.
• Tapeworm
• Leech
• Cockroach
• Starfish
• Fish
• Frog
• Eagle
• Garden lizard
• Elephant
♦ Which are the life processes carried out in multicellular organisms?
• Movement
• Nutrition
• Respiration
• Digetion
• Excreation
• Reproduction
♦ Do unicellular organisms also have all the same life processes as in multicellular organisms?
• All the life processes in multicellular organisms occur in unicellular organisms
also.
• In unicellular organisms, all life processes are performed by a single cell.
♦ Complete the given table by including the characteristics of unicellular and multicellular organisms.
| Unicellular Organisms | Multicellular Organisms |
|---|---|
| Possess single cell | Body is made up of many cells |
| All life processes are performed by a single cell | Each life processes are performed by specific cells and organs. |
| We cannot see them with naked eyes | We can see them with naked eyes |
| They have a simple body structure | They have a complex body structure |
| E.g.: Paramecium, Amoeba, Euglena | E.g.: Humans, plants, animals |
♦ What are cell organelles?
• There are specific members within the cell to perform each function. These are called cell organelles.
• Cell organelles found within the cells are also different. Their functions are also different.
♦ Identify and list the different parts of cell with the help of the picture.
• Cytoplasm
• Cell membrane
• Endoplasmic Reticulum
• Mitochondrion
• Ribosome
• Vacuole
♦ What are the different parts of the animal cell and their functions?
| Parts of cell | Function |
|---|---|
| Cell membrane | Covers the cell |
| Cytoplasm | Holds the cell parts inside the cell, except nucleus |
| Nucleus | Controls cellular activities |
| Vacuole | Stores water, salt and excretory products |
| Ribosome | Synthesises protein |
| Endoplasmic reticulum | Acts as intracellular pathway |
| Mitochondrion | Synthesises energy |
It covers and protects the cell.
• Which is the part that controls the entire cell?
Nucleus
• Which cell organelle works as the powerhouse of the cell?
Mitochondrion
• Which organelle acts as the pathway within the cell?
Endoplasmic reticulum
• What is the difference between the function of vacuole and that of ribosome?
The function of vacuole is to store water, salt and excretory products. The function of ribosome is to synthesise protein.
♦ Observe the picture and list the parts of a plant cell.
• Nucleus
• Endoplasmic Reticulum
• Cytoplasm
• Mitochondrion
• Ribosome
• Cell
• membrane
• Vacuole
• Chloroplast
♦ How does plant cell differ from animal cell? Do you see any part in plant cells that is different from animal cells?
• Chloroplast
• Cell wall
♦ Write the list of plant cell parts that differ from animal cells and their functions.
| Parts of cell | Function |
|---|---|
| Cell wall | Protects the cell |
| Chloroplast | Helps in photosynthesis |
♦ Tabulate the similarities and differences between the animal cell and plant cell
| Similarities between plant cell and animal cell | Differences between plant cell and animal cell |
|---|---|
| • Both have a nucleus, an important cell organelle inside the cell, which controls cellular activities. • Both have Cell membrane, Cytoplasm, Endoplasmic Reticulum, Mitochondrion, Ribosome and Vacuole. | • Plant cells have a cell wall in addition to the cell membrane that found in animal cells. • Chloroplasts are present in plant cells but not in animal cells. • The vacuole in the plant cell is large, and that in the animal cell is small. |
♦ Isn’t the body made up of cells? If so, do we have the same type of cells in all parts of our body?
The human body is made up of different types of cells. There are about 200 different types of cells, such as nerve cells, blood cells and muscle cells. Functions of all these are not the same. Their shapes also vary.
♦ What are tissues?
Cells that are similar in shape and perform the same function are collectively called tissues.
♦ Different types of tissues
• Epithelial tissues: Skin is the part that covers and protects the body of animals. It is a group of cells. These are the epithelial tissues.
• Nervous tissues: Nervous tissues are formed by the combination of nerve cells.
• Muscular tissues: Muscular tissues are formed by the combination of muscle cells.
• Different tissues function together to form organs.
• Example: Liver, heart
♦ Observe the given picture. What do you see?
• Nostrils
• Trachea
♦ Organ system
• When different organs function in coordination, they form an organ system.
• The lung is an organ. Similarly, nostrils and trachea are also organs. Together, they form the respiratory system.
• Circulatory system is another organ system.
• An organism is formed by the combination of such organ systems.
♦ Observe the illustration of the journey of a cells to an organism.
Cells ➞ Tissues ➞ Organs ➞ Organ System ➞ Organism
Let's Asses
1. Some statements related to cells are given. Identify the incorrect statement.
A. All cells have cell wall.
B. All cells have cell membrane.
C. All cells have chloroplast.
D. All cells have cytoplasm.
Answer: A and C
2. Read the given statement. ‘Plant body is made up of cells. Animal body is made up of cells.’ What conclusion can be drawn from these statements?
• There is no diversity among the cells of living organisms.
• Cells are the building blocks of all things.
• Cells are the building blocks of all living things.
• Organ systems in animal body and plant body are the same.
Answer: Cells are the building blocks of all living things.
3. Arrange the following in sequential order.
Cells, Organism, Tissues, Organ system, Organ
Answer: Cells ➞ Tissues ➞ Organ ➞ Organ System ➞ Organism
4. Unicellular organisms have smaller cells and multicellular organisms have larger cells. What is your response to this statement?
Answer: This statement is not true. The difference in size between organisms is due to the difference in the number of cells.
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