Short Questions Flashcards
(31 cards)
What is cork?
Cork is a substance which comes from the bark of a tree.
Define cell?
A cell is capable of independent existence and can carry out all the functions which are necessary for a living being.
Who discovered nucleus in the cell?
Robert Brown discovered nucleus in the cell.
What is the fundamental unit of life?
The cell is the fundamental unit of life.
Where and who discovered free living cells?
Leeuwenhoek discovered the free living cells in pond water.
What do you mean by osmosis?
The movement of water molecules through such a selectively permeable membrane is called osmosis.
Name the autonomous organelles in the cell?
Chloroplasts and mitochondria are the autonomous organelles in the cells.
Name the two cells which keep changing their shapes?
Amoeba and white blood cells are the two which keep changing their shapes.
What is diffusion?
When substances like carbon di oxide and oxygen can move across the cell membrane that is known as diffusion.
Name the smallest and longest cell in the human body?
The smallest cell is red blood cell and the longest cell is nerve cell in the human body
What is active transport?
The movement of molecules across a membrane in the cells against a concentration gradient with the help of ATP is called active transport.
Why nucleus is called the brain of the cell?
Nucleus is called the brain of the cell as it controls most of the activities of the cell because it contains DNA which contains all the information of the
cell. The nucleus plays a central role in cellular reproduction.
Name three basic component of a typical eukaryotic cell. Name the non- living component in a plant cell.
Plasma membrane, nucleus and cytoplasm are the basic component of typical eukaryotic cell. Cell wall is the non-living component.
Briefly describe the structure of ER.
The ER is a large network of membrane-bound tubes and sheets. It looks like long tubules or round or oblong bags.There are two types of ERRough endoplasmic reticulum [RER] and smooth endoplasmic reticulum [SER].
Name the smallest and longest cell in the human body.
Smallest cell- RBC
Longest cell- nerve cell
When a cell placed in a solution and it swells up. Name the kind of solution which is responsible for it?
The name of the solution is hypotonic solution & when water enters the cell through endosmosis, it causing the cell to swell up.
Give the advantage of multicellularity over unicellularity?
Division of labor is one of the major advantages of multicellularity over unicellularity.
List the functions of cytoplasm.
Its main function is to hold together the organelles which make up the cytoplasm. It also nourishes the cell by supplying it with salts and sugars and
provides a medium for metabolic reactions to occur.
Name the membrane covering vacuole. List any function of vacuole.
Tonoplast. The vacuole plays an important role in digestion and excretion of cellular waste and storage of water and organic and inorganic
substances
Will osmosis occur in boiled potato?
Osmosis occurs only in living cells hence it will not happen in boiled potato.
Where are chromosomes located in a cell? How are they important to us?
Chromosomes are located in the nucleus. They carry hereditary information in the form of genes for structural and functional traits.
Give one function of RER and SER.
RER helps in protein synthesis.
SER helps in lipid synthesis.
) What will happen if the cellular organization is destroyed due to some physical or chemical means?
If organization is destroyed, the cell will not be able to perform many of its function. Which will cause cell death.
Mention any two functions of nucleus.
The two functions of nucleus are:
i. nucleus is the control center of cell. Helps in transmission of hereditary characters.
ii. nucleus is responsible for cell reproduction.
