Free The Fundamental Unit of Life 02 Practice Test - 9th Grade
Question 1
Cork is obtained from which part of the tree?
Root
Bark
SOLUTION
Solution : D
Bark comprise the outermost layers of stems and roots of woody plants. Plants with bark include trees, woody vines, and shrubs. Cork is obtained from the bark of a tree.
Question 2
Which of the following are single-celled organisms?
Hydra
Amoeba
Chlamydomonas
Paramecium
SOLUTION
Solution : B, C, and D
Unicellular organisms, such as amoeba, paramoecium, yeast, etc., consist of a single cell. All the vital processes such as nutrition, digestion, excretion, reproduction, etc., are carried out by the single cell. Hydra, on the other hand, is an organism that is made up of multiple cells.
Question 3
Which of the following is correct regarding diffusion?
Diffusion takes place only in gases.
Diffusion takes place only outside the cells.
Osmosis is a special case of diffusion.
Diffusion takes place only in liquids.
SOLUTION
Solution : C
Diffusion is the process of spontaneous movement of a substance from a region of high concentration to a region where its concentration is low.
Movement of substances across small distances in a cell takes place through diffusion. Osmosis is a special case of diffusion
through a selectively permeable membrane.
Question 4
Identify the parts labelled A and B.
A - Objective Lens, B - Eyepiece
A -Eyepiece, B - Objective lens
A - Focussing lens, B - Eyepiece
B - Objective lens, B - Convex lens
SOLUTION
Solution : B
Following is the completely labelled diagram of a compound microscope.
Question 5
Which of the following organelle is called as the 'suicide bags' of the cell?
Mitochondria
Lysosomes
Golgi apparatus
Endoplasmic reticulum
SOLUTION
Solution : B
Lysosomes are called the 'suicide bags' of the cell. They contain digestive enzymes that break down wastes, foreign substances and cellular debris. Apart from these, lysosomes also digest cells by their own protein-digesting enzymes, leading to cell death.
Question 6
Which of the following is/are true about chloroplasts?
Chloroplasts are present only in animal cells.
Chloroplasts store fat.
Chloroplasts are a type of plastid.
SOLUTION
Solution : C
Chloroplasts are green coloured plastids which are responsible for photosynthesis. They are double-membraned, have their own genetic material and contain the green pigment chlorophyll.
Leucoplasts are plastids which are responsible for the storage of fat.
The mitochondrion is the major site for ATP synthesis.
Question 7
Which of the following statements is/are not true about endoplasmic reticulum (ER)?
The ER is responsible for the disposal of cellular wastes.
SOLUTION
Solution : A
The endoplasmic reticulum (ER) is a membrane-bound organelle which helps in the synthesis and transportation of proteins. Rough endoplasmic reticulum (RER) has ribosomes attached to its surface and helps in protein synthesis. Smooth endoplasmic reticulum (SER) has no ribosomes attched to its surface. It helps in the manufacture of fat molecules, or lipids, important for cell function.
Lysosomes are associated with the disposal of cellular waste material.
Question 8
Which of the following structure is found inside the nucleus?
SOLUTION
Solution : B
∙ Nucleolus is a naked, round or slightly irregular structure which is attached to the chromatin at a specific region.
∙ Generally, 1-4 nucleoli are found inside nucleus.
∙ Nucleus is a double-membraned organelle, present only in eukaryotic cells, which contains the genetic material of the cell.
Question 9
Gases like carbon dioxide and oxygen can move across the cell membrane.
SOLUTION
Solution : A
Gases like carbon dioxide and oxygen cross the membrane by the process of diffusion and move from the region of higher concentration to that of lower concentration across the cell membrane.
Question 10
___ lacks a nuclear membrane.
SOLUTION
Solution : D
Prokaryotic cells like bacteria, are primitive cells which lack nuclear membrane and hence, lack a well-defined nucleus. They do not have the cellular organelles which are found in eukaryotic cells.
Yeast is a fungi and ovum and kidney cells are the animal cells.