Identify the statement which is true for cells.a)Cells can be easily seen with naked eyes.b)Insects egg is not a cell.c)A single cell can perform all the functions in a unicellular organism.d)The size and shape of cells is uniform in multicellular organismsCorrect answer is option 'C'. Can you explain this answer?

Question

Identify the statement which is true for cells.a)Cells can be easily seen with naked eyes.b)Insects egg is not a cell.c)A single cell can perform all the functions in a unicellular organism.d)The size and shape of cells is uniform in multicellular organismsCorrect answer is option 'C'. Can you explain this answer?

Answer

Let's understand each statement individually, and see how they are correct or incorrect:

A) The statement is incorrect. The majority of the cells cannot be seen directly with our naked eyes because cells are extremely small. Microscopes are composed of a combination of lenses that form a magnified image.

B) The statement is incorrect. An insect's egg is a single cell.
Fun Fact: Ostrich egg is the biggest cell

C) The statement is correct. Cells are called the structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells. The unicellular organism is made up of a single cell and performs all the life processes for survival.

D) The statement is incorrect. The size and shape of the different cells are not the same in a multicellular organism, for example in the human body the longest cell is the nerve cell.

Hence, option C is the correct answer.

You can test yourself in detail by going through the tests for Cell Structure & Functions:

Test 1:

Test: Cell Structure & Functions- 1

https://edurev.in/course/quiz/attempt/-1_edurev/52d75bf9-9889-43cf-b989-cec4ca62bd59

Test 2:

Test: Cell Structure & Functions- 2

https://edurev.in/course/quiz/attempt/-1_edurev/043f05f8-d50d-46a6-b0e8-d3e0f91689cd

Answer

D is correct option as the size of each cell is different. RBC WBC Platelets hepatocytes all have different sizes

Answer

The statement that is true for cells is: a single cell can perform all the functions in a unicellular organism.

Unicellular organisms, as the name suggests, are made up of only one cell. These organisms include bacteria, protozoa, and some types of algae. In contrast, multicellular organisms are made up of multiple cells, which work together to carry out various functions.

What is a cell?

A cell is the basic structural and functional unit of all living organisms. It is the smallest unit of life that can exist as a self-sustaining entity. Cells are responsible for carrying out all the necessary functions to maintain life.

Functions of a cell in a unicellular organism:

In unicellular organisms, a single cell is responsible for performing all the necessary functions required for survival. These functions include:

1. Nutrition: The cell takes in nutrients from its environment and converts them into usable energy.

2. Metabolism: The cell carries out various metabolic processes, such as respiration, photosynthesis, and synthesis of biomolecules.

3. Growth: The cell undergoes growth by increasing in size and dividing into two identical daughter cells.

4. Reproduction: The cell is capable of reproducing by dividing into two daughter cells through a process called binary fission.

5. Response to stimuli: The cell can respond to changes in its environment, such as light, temperature, and pH.

6. Excretion: The cell eliminates waste products through processes like diffusion or active transport.

7. Homeostasis: The cell maintains a stable internal environment by regulating its internal conditions, such as pH, temperature, and ion concentrations.

8. Movement: Some unicellular organisms, like protozoa, are capable of moving using structures like flagella or cilia.

Importance of single-cell functionality:

The ability of a single cell to perform all these functions is crucial for the survival and success of unicellular organisms. Since they consist of only one cell, each cell must be capable of carrying out all the necessary processes for its survival and reproduction.

Without this ability, unicellular organisms would not be able to obtain energy, grow, reproduce, or respond to changes in their environment. They would not be able to maintain homeostasis or eliminate waste products. In essence, the entire survival and functioning of a unicellular organism depend on the abilities of its single cell.

Conclusion:

In conclusion, the statement that a single cell can perform all the functions in a unicellular organism is true. Unicellular organisms rely on the capabilities of their single cell to carry out all the necessary processes required for their survival and reproduction. The cell functions as the fundamental unit of life, performing a variety of functions to ensure the organism's viability.

Similar UPSC Doubts

Which of the following statements correctly distinguishes between diatoms and dinoflagellates?

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

Consider the following organisms:1. Amoeba2. Chlamydomonas3. Hydra4. ParameciumWhich of the above given organism is/are not a unicellular organism?

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