9th Science SET 3

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Free Online Best 9th Class Science Questions for improve your knowledge of Science Subject and General Knowledge for competitive exams. This 9th Science Set 3 test that contains 25 Multiple Choice Questions with 4 options. You have to select the right answer to a question.

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Question 1

Mitochondria are the sites of respiration in the cell. They oxidize carbohydrates and fats present in the cell to produce carbon dioxide, water and a lot of energy. The energy so released is stored in the form of ATP molecules. Since mitochondria in the cell are used to synthesize energy so, they are also called____

A	Energy currency of the cell
B	Energy generator of the cell
C	Kitchen of the cell
D	Power house of the cell

Question 2

Endoplasmic reticulum one of the cell organelles, exists as a membranous network that extends from outer membrane of nucleus to the plasma membrane making a connection between them.Which of the following statements is not related to the endoplasmic reticulum?

A	It behaves as transport channel for proteins between nucleus and cytoplasm.
B	It transports materials between various regions in cytoplasm.
C	It can be the site of energy generation.
D	It can be the site of some biochemical activities of the cell.

Question 3

The process of plasmolysis in plant cell is defined as____

A	Breakdown of plasma membrane in hypotonic solution.
B	Shrinkage of cytoplasm in hypertonic medium.
C	Shrinkage of Nucleoplasm.
D	None of the Above

Question 4

In a test, a teacher collected the answers written by four students as the definition of osmosis as given below. Read carefully and select the correct one___

A	Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane.
B	Movement of solvent molecules from its higher concentration to lower concentration.
C	Movement of solvent molecules from higher concentration to lower of solution through a permeable membrane.
D	Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane.

Question 5

Tissue is a group of similar kind of cells specialized to perform a particular function in the body. Therefore presence of tissues in a multicellular organism ensures___

A	Faster development
B	Division of labour
C	Higher reproductive potential
D	Body strength

Question 6

Epithelial tissue always has an exposed outer surface and an inner surface anchored to connective tissue by a thin, non- cellular structure called the_____

A	Nonstratified layer
B	Stratified layer
C	Basement membrane
D	Fibroblast

Question 7

Which of the following statement marks as a difference between plant cell and animal cell?

A	Plant cells have cell wall which animal cells do not.
B	Plant cells do not have vacuole while animal cells do have.
C	Plant cells have only cell membrane while animal cells have both cell wall as well as cell membrane.
D	Plant cells have more plastids while animal cells have few plastids.

Question 8

Rahul’s mother was going to make pickle. For this she cut the vegetables into small pieces and put them in the sun for few hours. Rahul was observing all her activities very curiously and asked his mother if why she had put the salted vegetables in the sun. among the following what might be the most appropriate answer for his question?

A	So that the pickle may get extra flavour.
B	So that the cut vegetables may absorb the vitamin d as a nutrient from the sun rays.
C	So that the vegetables may lose all the water by diffusion and evaporation and become dry.
D	So that the salt may get evenly and properly absorbed by the vegetables.

Question 9

Xylemis the specializedtissue of the plants that transports water and nutrients from the soil to the upper parts like stems and leaves of plant and provides mechanical support to them. It is composed of four different types of the cells. Which of the following is not one a type of cell found in xylem tissues?

A	Tracheids
B	vessels
C	Xylem parenchyma
D	Sieve tubes

Question 10

Simple epithelium is a tissue, which form the outer protective layer of the skin of the animal body, is composed of cells which are_____

A	Hardened and provide support to organs
B	Continuously diving to provide to form an organ
C	Cemented directly to one another to form an irregular layer
D	Loosely connected to one another to form an irregular layer

Question 11

Cardiac muscleis one of the three major types of muscles, the others being skeletal and smooth muscles. It is found in the walls and histological foundation of the heart. Which one of the following statements is not related to the cardiac muscles?

A	They muscles show rhythmic contraction and relaxation throughout life.
B	They do not work according to our will, so they are called involuntary muscles.
C	They are non-striated, multinucleated and branched muscles.
D	The contraction and relaxation of the heart muscles help to pump and distribute blood to different parts of the body.

Question 12

Which radioactive element is used in the treatment of cancer?

A	Iodine-131
B	Uranium-234
C	Plutonium-239
D	Cobalt-60

Question 13

Cell is the structural and functional unit of life. The word cell is derived from the Latin word ‘cellula’ which means “a little room”. Can you name the scientist who coined the term cell?

A	Robert Hooke
B	Anton Von Leeuwenhoek
C	Robert Brown
D	Ernst Haeckel

Question 14

You must have observed that a fruit when unripe is green but it becomes beautifully coloured when ripe. According to you what is the reason behind this colour change?

A	Chloroplasts change to chromosplasts
B	Chromosplasts change to chromosomes
C	Chloroplasts change to chromosomes
D	Chromosplasts change to chloroplasts

Question 15

A person met with an accident in which two long bones of his hand were dislocated. Which among the following may be the possible reason for this?

A	Tendon breaks
B	Break of skeletal muscles tissue
C	Ligament breaks
D	Areoelar tissue breaks

Question 16

Which of the following pairs are isobars?

A	17Cl35 & 17Cl37
B	18Ar40 & 20Ca40
C	6C12 & 6C14
D	None of the Above

Question 17

While doing work and running, you move your organs like hands, legs, etc. Which among the following is correct?

A	Smooth muscles contract and pull the ligament to move the bones
B	Smooth muscles contract and pull the tendons to move the bones
C	Skeletal muscles contract and pull the ligament to move the bones
D	Skeletal muscles contract and pull the tendon to move the bones

Question 18

What prevents an atom from being collapsed?

A	The nuclear forces
B	Movement of electrons in discrete energy levels
C	The electron-electron repulsions
D	all of the Above

Question 19

A cell will swell up if_____

A	The concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium.
B	The concentration of water molecules in the surrounding medium is higher than the concentration of water molecules in the cell.
C	The concentration of water molecules is same in the cell and in the surrounding medium
D	The concentration of water molecules does not matter.

Question 20

Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one. Can you pick out the option among the following which does not belong to this process?

A	The movement of water across a semipermeable membrane is affected by the amount of substances dissolved in it.
B	Membranes are made of organic molecules such as proteins and lipids.
C	Molecules soluble in organic solvents can easily pass through the membrane.
D	Plasma membranes contain chitin sugar in plants.

Question 21

Among the following statements which one is incorrect?

A	Cytoplasm is called known as protoplasm.
B	Golgi apparatus is involved with formation of lysosomes.
C	Nucleus, mitochondria and plastid have DNA, hence they are able to make their own structural proteins.
D	Lysosomes are called the suicide bags as they eat up their own cells.

Question 22

Tiny pores are found on the surface of the leaves of plants. These pores are called stomata. These stomata surrounded by the kidney shaped guard cells provide many vital functions to the plants. Which of the following functions is not served by the stomata for the plants?

A	Exchange of gases, particularly CO2 and O2, with atmosphere
B	Loss of water in the form of vapours during transpiration
C	Helps to create pressure for the water to rise upward, by its process of transpiration
D	Helps the leaves to carry out the process of photosynthesis

Question 23

Meristemetic tissues are those which help in increasing the length and girth of the plan. Which of the following statements given below is correct about the meristematic tissue?

A	It is made up of cells that are incapable of cell division
B	It is made up of cells that are capable of cell division
C	It is composed of single type of cells
D	It is composed of more than one type of cells

Question 24

Which of the following is an incorrect statement in reference with observation in Rutherford’s ?-particle scattering experiment?

A	Some of the ?-particles rebound after hitting the gold foil
B	Some of the particles deflected from their path
C	Some of the particles not pass through the gold foil
D	Most of the particles pass straight through the gold foil

Question 25

Lysosome is a cytoplasmic organelle containingenzymesthat break down biological polymers. Lysosomes function as the digestive system of the cell. It is also called the suicide bag of the cell because____

A	It causes any cell to commit suicide
B	Its enzymes digest the cell itself
C	Its enzymes kill surrounding cells
D	All of the above

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