Cell—structure And Functions

The living beings which are made of a single cell are called unicellular organisms. The single cell carries on as an entire living being performing all the essential functions such as digestion, respiration, circulation, excretion etc.

A cell is the smallest and essential unit of life which has a definite structure and plays out particular functions. The greater part of them can't be seen with exposed eyes since they are tiny (i.e little).

The right blend of terms with reference to an animal cell will be cell membrane, mitochondria, ribosome, and chromosome. An animal cell does not have a cell wall, plastid, and chloroplast, but rather these are available in plant cells.

Ribosome isn't a constituent of the nucleus. They are discovered drifting in the cytosol or joined to the endoplasmic reticulum.

The nucleus is the biggest organelle in the cell that contains string-like structures called chromosomes on which genes are available. The nucleolus is the round unpredictable structures show inside the core.

The various components of cells are called cell organelles.

Cytoplasm is the jelly-like liquid which fills the cell amongst nucleus and cell membrane. The vast majority of the chemical reactions which keep the cell alive happens here.

Prokaryotes are a group of organisms which lack a well defined nucleus, nucleolus, and other cell organell

● Chromosomes are thread-like structure formed of DNA which carries genes which control characteristics of the offspring.

● Both genes and chromosomes carry hereditary information to the offspring.

● They both are an integral part of one another.

● Both occur in pairs.

● Both are found inside the nucleus.

Chromosomes are thread like structure formed of DNA which carries genes which control characteristics of the offspring.

Green colour of leaves is due to presence of the pigment chlorophyll. It is responsible for photosynthesis.

The unit of measurement used for expressing the dimension (size) of cells is micrometer.

Cell membrane is the outermost protective layer which controls the entry and exit of materials from cells.

Paheli accidentally placed her hand over a flame and immediately pulled it back. She felt the sensation of heat and reacted due to the action of nerve cells. Our nervous system is responsible for all these purposes. The nerve cells are long branched structures which receive and transmit information.

Cell membrane is the outermost protective layer which controls the entry and exit of materials from cells which is common to plant cell, animal cell, and a bacterial cell.

Chromosomes are thread like structure formed of DNA which carries genes which control characteristics of the offspring.

The living beings which are made of a single cell are called unicellular organisms. The single cell carries on as an entire living being performing all the essential functions such as digestion, respiration, circulation, excretion etc.

Virus are neither living nor non-living thus they are not considered a cell.

Cell wall is present in plants but absent in animal cells. So cell wall is the only feature that distinguishes both.

The cell that she observes is a bacterial cell. Since only prokaryotes have a cell wall but lack a nucleus.

Cheek cells do not have plastids since they are animal cells. Rest all structures are common to all plant and animal cells.

Prokaryotes are a group of organisms which lack well defined nucleus, nucleolus, and other cell organelles.

Eukaryotes are those organisms which have a well-defined structure consisting of a nucleus with a nuclear membrane.

A tissue is a gathering of comparative cells that cooperate to play out a specific function.

Amoeba continues changing its shape because of the arrangement of pseudopodia that aides in development and catching nourishment.

In a plant cell, green shaded plastids called chloroplasts are available. They are the destinations of photosynthesis.

Muscle cells are shaft molded to achieve development of the body by contracting and unwinding.

Nerve cells are long and fanned to get the boosts and transmit a message to cerebrum that sends the reaction.

the cell organelle and pigment that is responsible for green color is chloroplast and chlorophyll due to photosynthesis.

The instrument used to observe cells is a microscope.

Chromosomes are thread-like structure formed of DNA which carries genes which control characteristics of the offspring.

Amoeba and Paramecium belong to a unicellular prokaryotic group of organisms. Prokaryotes are a group of organisms which lack a well defined nucleus, nucleolus, and other cell organelles.

Cell wall is an extra layer encompassing the plasma film in plant cells. Its functions are:

(I) to give shape and support to the plant cell.

(ii) to give assurance against varieties in temperature, barometrical dampness, and so on.

(iii) counteracts water misfortune.

(iv) controls the rate and heading of cell development and directs cell volume.

We do not sense any pain when we clip our nails or cut our hair. This is due to the fact that nails and hair lack nerve cells thus no pain is felt.

The previously mentioned proclamation isn't right. The unicellular life forms likewise breathe, replicate and convey every metabolic capacity like multicellular creatures.

The distinction is that every one of the functions is performed by the single cell in a unicellular creature. Comparatively, in multicellular life forms are performed by different organs (organ framework) which are comprised of a wide range of sorts of cells.

A-iii, B-iv; C-ii; D-i

A. It represents an animal cell. The cell wall is present in plants but absent in animal cells. So cell wall is the only feature that distinguishes both.

B. It represents a eukaryotic cell. Prokaryotes are a group of organisms which lack a well defined nucleus, nucleolus, and other cell organelles.

A- Nucleus;

B-Cell membrane;

C-Genes/Chromosomes

a- cell wall;

b- Cell membrane;

c- cytoplasm;

d- cell organelles;

e- nucleus;

f- chromosomes.

Although cell organelles have specific structures and perform specific functions but they cannot be called structural and functional units of living organisms. This is so because they can perform their functions only when they are within a living cell. They cannot function outside the cell as an independent unit.

As plants cannot move they need protection against variations in temperature, high wind speed, atmospheric moisture, etc.

Therefore, for protection plant cell........ membrane. This layer is called the cell wall. Plant cells have an additional layer surrounding the cell membrane.

The span of the cells of a life form isn't connected with the measure of its body. This can be comprehended in the case of an elephant and a rodent.

The cells in elephant are not greater when contrasted with the cells of a little creature like a rodent. Henceforth, demonstrating that cells are not identified with the extent of life form.

Be that as it may, the span of a cell is identified with the capacity it performs. The nerve cells in both rodent and elephant are long and stretched and play out a similar capacity for exchanging and accepting messages. Accordingly, helps in the coordination of various elements of body parts.