Class 9 - Arihant - All in one (Science) - The fundamental unit of LifeContact Number: 8527521718Class 9 - Arihant - All in one (Science) - The fundamental unit of LifeContact Number: 8527521718Who discovered cell and how?
Why is the cell called the structural and functional unit of life?
How do substances like and water move in and out of the cell? Discuss.
Why is the plasma membrane called a selectively permeable membrane?
Can you name two organelles we have studied that contain their own genetic material?
If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?
Why are lysosomes known as sucidial bags?
Where are proteins synthesised inside the cell?
What would happen if the plasma membrane ruptures or break down?
What would happen to the life of a cell if there was no Golgi apparatus?
Which organelle is known as the powerhouse of the cell? Why?
Where do the lipids and proteins constituting the cell membrane get synthesised?
How does Amoeba obtain its food?
What is osmosis?
Carry out the following osmosis experiment: Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a through containing water. Now,
1. keep cup A empty
2. put one tea spoon sugar in a cup B.
3. put one tea spoon salt in cup C.
4. put one tea spoon sugar in the boiled potato cup D.
keep them for two hours. then observe the four potato cups and answer the following.
1. Explain, why water gathers in the hollowed portion of A and D/
2. Why is potato a necessary for ecperiment?
3. Explain, why water does not gather in the hollowed out portion of A and D?
The term 'protoplasm' was coined by
1. Purkinje
2. Robert Hooke
3. Virchow
4. Robert Brown
Choose the incorrect statement for the following options
1. All cells arise from pre-existing cells only
2. Rudolf Virchow proposed the cell theory
3. Nucleus was discovered by Robert Brown in 1831.
4. The nucleus and cytoplasm of living cell, altogether form the protoplasm.
The flexibility of plasma membrane can be contributed to the presence of
1. proteins
2. lipids
3. nucleic acids
4. both (a) and (b)
A cell will swipe up if the
1. concentration of molecules in the cell is higher than the concentreation of water molecules in surrounding medium.
2. concentration of water molecules in surrounding medium is higher than concentration of water molecules in the cell.
3. concentration of water molecules is same in the cell and in the surrounding medium.
4. concentration of water molecules does not matter
The cell wall of which out of these is not made up of cellulose?
1. Bacteria
2. Hydrilla
3. Mango Tree
4. Cactus
Which one of the following terms describes 'a nucleus without nuclear membrane'?
1. Nucleolus
2. Primitive nucleus
3. Nucleoid
4. All of these
Which one of the following cellular functions is performed by endoplasmic reticulum?
1. Production of hydrolytic enzymes
2. supply of energy to cell
3. formation of lysosomes
4. production of vacuoles
Organelle other than nucleus, containing DNA is
1. endoplasmic reticulum
2. Golgi apparatus
3. mitochondria
4. lysosomes.
ASSERTION Rudolf Virchow proposed cell theory.
REASON His cell theory states that all plants and animals are composed of cells.
1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true, but reason is not correct explanation of assertion.
3. If assertion is true, but reason is false.
4. If both assertion and reason is true.
ASSERTION Chromosmes are constituted by DNA and protein.
REASON These are thread like structures present in nucleus.
1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true, but reason is not correct explanation of assertion.
3. If assertion is true, but reason is false.
4. If both assertion and reason is true.
ASSERTION Prokaryotic cells are primitive and larger than eukaryotic cells.
REASON Prokaryotic cells lack cytoplasmic organelles.
1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true, but reason is not correct explanation of assertion.
3. If assertion is true, but reason is false.
4. If both assertion and reason is true.
ASSERTION Golgi bodies store, modify and pack products in vesciles.
REASON They are involved in the formation of lysosomes.
1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true, but reason is not correct explanation of assertion.
3. If assertion is true, but reason is false.
4. If both assertion and reason is true.
ASSERTION Mitochondria are known as the powerhouse of a cell.
REASON These generate energy (as ATP) for various cellular activities.
1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true, but reason is not correct explanation of assertion.
3. If assertion is true, but reason is false.
4. If both assertion and reason is true.
Name two unicellular organisms.
Name the process in which diffusion takes place through a semipermeable membrane.
What will happen if the already swollen raisin is kept in salt solution?
Name the process by which unicellular freshwater organisms and most plant cells tend to gain water.
What is the function of cellulose in plant cell?
Why is nucleus called controller or brain of the cell?
State two important functions of the nucleus of the cell.
What is DNA? Where is it present?
How DNA is present in a cell which is
1. Dividing?
2. Not dividing?
Which organelle is called factory of ribosomes?
What are dictyosomes?
Is there any animal cell that lacks lysosomes?
In which cell organelle the complete breakdown of glucose in the presence of oxygen takes place?
Name the energy currency of cell.
Which organelles are present only in plants cells and possess their own genome and ribosomes?
Name two structures, which are found in plant cell, but not in animal cell.
Name the type of plastid that helps in the process of photosynthesis.
Plant cells have large vacuoles each surrounded by a membrane. What is the name of this membrane?
Lists the contributions of the scientists given below in context of the study of cells
1. Antony van Leeuwenhoek
2. Robert Brown
3. Camillo Golgi
What are the consequences of the following conditions?
1. Cell having higher water concentration than surrounding medium.
2. A cell having lower water concentration than surrounding medium.
3. A cell having equal concentration to its surrounding medium.
State in brief, what happens when
1. Dry apricots are left for some time in pur water and later transferred to sugar solution.
2. Rheo leaves are boiled in water first and then a drop of sugar syrup is pour on it.
3. Goli apparatus are removed from the cell.
1. Explain how do cell walls permit thet cells of fungi to withstand very dilute external media without bursting.
2. Why does the skin of your fingers shrink when you wash clothes for a long time?
Describe the sructural features of cell membrane and cell wall. Why is cell membrane called selectively permeable membrane?
Explain in detail what di you know about the structure of nucleus.
1. Where are chromosomes located? What is chromatin material and how does it change just before the cell divides?
2. 'The functional segments of DNA are genes'. Give reasons.
State three differences between plasma membrane and cell wall.
What do you mean by the following terms?
1. Protoplasm
2. Cytoplasm
3. Nucleoplasm
State some differences between cytoplasm and nucleoplasm.
Differentiate between Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER). How endoplasmic reticulum is important for membrane biosynthesis?
Describe the phenomenon of membrane biogenesis. Give one function of ER.
Name the organelle of the cell, which is involved in the formation of lysosomes. Write its functions in the cell.
1. Why lysosomes are known as 'scavengers of the cell'?
2. Lysosomes are self-destructive. True/ false. Give reasons
How many membranes are present in mitochondria? Give the characteristics features of these membranes. What is the advantage of such features?