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8th Grade > Biology

CELL - STRUCTURE AND FUNCTION MCQs

Total Questions : 55 | Page 1 of 6 pages
Question 1. Plasma membrane is made up of ________.
  1.    cellulose
  2.    silicon
  3.    chitin
  4.    phospholipids
 Discuss Question
Answer: Option D. -> phospholipids
:
D
The plasma membrane is composed mainly ofphospholipids. They are arranged in two layers, called aphospholipid bilayer. Each phospholipid molecule has a head and two tails. The head “loves”water(hydrophilic) and the tails “hate” water (hydrophobic).
Thewater-hating tails are on the interior of the membrane, whereas the water-loving heads point outwards, toward either the cytoplasm or the fluid that surrounds the cell.
Plasma Membrane Is Made Up Of ________.
Question 2. ________ is the pigment which is responsible for the green colour of plants.
  1.    Chlorophyll
  2.    Xanthophyll
  3.    Leucophyll
  4.    Chloroplast
 Discuss Question
Answer: Option A. -> Chlorophyll
:
A
Plants appear green due to the presence of a pigment called chlorophyll. There are high concentrations of chlorohyllin chloroplasts. These plastids are responsible for photosynthesis.
Question 3. Choose the incorrect statements from the following statements.
Statement 1: Amoeba uses pseudopodia for locomotion.
Statement 2: Amoeba can change its shape.
Statement 3: Amoeba uses flagella for locomotion
  1.    Statement 1 is incorrect
  2.    Statement 3 is incorrect
  3.    Statement 2 is incorrect
  4.    All statements are incorrect
 Discuss Question
Answer: Option B. -> Statement 3 is incorrect
:
B
Amoeba is a unicellular organism and can exist independently. It uses pseudopodia for locomotion and engulfing food. It can change its shape.
Question 4. Chloroplasts and golgi apparatus possess extrachromosomal DNA.
  1.    True
  2.    False
  3.    Leucophyll
  4.    Chloroplast
 Discuss Question
Answer: Option B. -> False
:
B
Extrachromosomal DNAis found outside thenucleusof acell. It is also referred to as an extra nuclear DNA orcytoplasmicDNA. The nuclearDNA which is also known as genomic DNAis responsible for almost all cellular functions. However, extrachromosomalDNA also serves important biological functions. Chloroplasts and mitochondria are cell organelles with extrachromosomal DNA.
Question 5. Among the following which cell can be seen with an unaided eye?
  1.    Sperm cell
  2.    Red blood cell
  3.    Hen's egg
  4.    Nerve cell
 Discuss Question
Answer: Option C. -> Hen's egg
:
C
Most of the cells are microscopic in size and are not visible to the unaided eye. They need to be enlarged or magnified by a microscope. Some cells are big enough to be seen with the unaided eye. Example of that is a hen’s egg which is considered as a single cell. It can be seen by the naked eye.
Question 6. Which of the following scientists discovered cells in cork slices?
  1.    Robert Hooke
  2.    Carl Linnaeus
  3.    Antonie van Leeuwenhoek
  4.    Louis Pasteur
 Discuss Question
Answer: Option A. -> Robert Hooke
:
A
Robert Hooke in 1665 observed thin slices of cork under a simple magnifying device. He observed box-like structures and named them cells. This is because these structures reminded him of the cells in a monastery.
Question 7. I am a double-membraned cell organelle. I produce energy-rich molecules called ATP. I have my own genetic material. Who am I?
  1.    Cell membrane
  2.    Plastid
  3.    Nucleus
  4.    Mitochondrion
 Discuss Question
Answer: Option D. -> Mitochondrion
:
D
Mitochondria are double-membraned cell organelles present in the cytoplasm. They have their own genetic material. They produce ATP, which are energy-rich molecules. Since they produce energy rich molecules, they are called the 'powerhouse' of the cell.
I Am A Double-membraned Cell Organelle. I Produce Energy-ric...
Question 8. The process of cell death is known as ___.
 Discuss Question

:
Cells are highly organised in multicellular organisms. Not only is the rate of cell division controlled, but also the rate of cell death.If cells are no longer needed, they commit suicide by activating an intracellular death program. This process is therefore calledprogrammed cell death orapoptosis.
Question 9. Which organelle is called the "suicide bag" of the cell?
  1.    Mitochondria
  2.    Lysosomes
  3.    Plastids
  4.    Golgi apparatus
 Discuss Question
Answer: Option B. -> Lysosomes
:
B
Lysosomes are called "suicide bags" of the cellbecause they have hydrolytic enzymes stored in them. These enzymes are used to digest complex molecules in a cell. When released into the cytoplasm, these enzymes can "digest" or destroy thecell itself. Therefore, they are called "suicide bags.
Question 10. Which of the following organelle is known as 'Post office' of the cell?
  1.    Golgi apparatus
  2.    Endoplasmic reticulum
  3.    Ribosome
  4.    Peroxisome
 Discuss Question
Answer: Option A. -> Golgi apparatus
:
A
The Golgi apparatus isresponsible for the packaging, modification and transport of proteins. Proteins formed in the rough endoplasmic reticulum are packaged into vesicles and are transported to the golgi apparatus. Once the proteins reachthe golgi, they are modified and transported to their respective locations through vesicles. Hence golgi apparatus is known as the post office of the cell.

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