Cell Basics: 28 MCQs with answers

Robert Hooke in 1665

Robert Hooke discovered the cell in 1665, as stated in the source content.

Cell → Tissue → Organ → Organ system → Organism

The structural hierarchy is cell → tissue → organ → organ system → organism, as given in the source.

Performing digestion

Functional roles include performing processes like digestion, respiration, and excretion, as mentioned in the source.

Number, shape, and size

The source states that variation in cells is based on number, shape, and size.

Color

The source mentions number, shape, and size as bases for variation, not color.

Robert Hooke

Robert Hooke discovered the cell in 1665, as per the source.

Excretion

Excretion is listed as a functional process in the source.

Cell → Tissue → Organ → Organ system → Organism

The correct order is cell → tissue → organ → organ system → organism, as given in the source.

17th century

1665 is in the 17th century.

False

The cell is the basic unit because it can perform all vital life functions independently, not merely because it is small.

True

The source explicitly states that variation in cells is based on number, shape, and size.

Tiny box-like compartments he named 'cells'

Robert Hooke saw tiny box-like compartments in cork and named them 'cells' from the Latin word for 'small room'. He did not see living cells or nuclei.

It groups together to form tissues, organs, and organ systems

As a structural unit, cells are the building blocks that group to form tissues, organs, organ systems, and the organism. The other options describe functional roles.

Muscle cells contracting to help you move

Muscle cells contracting is a functional process performed by cells. The other options describe structural organization, not cellular functions.

It cannot carry out all life processes independently

A molecule of water is small but cannot live or perform life functions like respiration, digestion, or reproduction. Only the cell is the smallest unit that can do all that.

Muscle cells – elongated – to contract and relax

Muscle cells are elongated to contract and relax. Nerve cells are long and branched to carry signals, and red blood cells are round and biconcave to carry oxygen.

Its single cell performs all life processes

A unicellular organism survives because its single cell carries out all life functions—respiration, digestion, excretion, and reproduction—independently.

Cell → Tissue → Organ → Organ system → Organism

The correct hierarchy is cells form tissues, tissues form organs, organs form organ systems, and organ systems form the organism.

Robert Hooke

Robert Hooke discovered the cell in 1665. Although Leeuwenhoek later observed living cells, Hooke is credited with the discovery.

Color of the organism

Cells vary in number, shape, and size. The color of the organism is not a basis for variation among cells.

Empty walls of dead plant cells

Hooke saw the empty walls of dead plant cells, which appeared as box-like compartments. He did not observe living cells or organelles.

Because it can perform all vital life functions independently

The cell is the basic unit of life because it is the smallest unit capable of performing all vital life functions independently, which is why unicellular organisms can survive.

A single cell can perform all vital life functions independently

Unicellular organisms survive because a single cell is capable of performing all vital life functions independently.

Photosynthesis

The source lists digestion, respiration, and excretion as functions, but not photosynthesis.

Forms tissues, which form organs, which form organ systems, which form the organism

As a structural unit, the cell forms tissues, which form organs, which form organ systems, which form the organism.

Cell → Performs respiration

As a functional unit, the cell performs processes like respiration, digestion, and excretion.

It is the only unit that can perform all life functions independently

The source emphasizes that the cell is the smallest unit capable of performing all vital life functions independently, not just the smallest structure.

Movement

The source lists digestion, respiration, and excretion, but not movement.