Tag: biology

Questions Related to biology

Lowest number of chromosomes is found in

biology organization of life comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

  1. Radiolaria

  2. Amoeba

  3. Ascaris meglocephala

  4. None of the  above

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Correct Option: C
Explanation:

Ascaris meglocephala (horse round worm ) has chromosome number 2n = 2. 

Amoeba has chromosome number 2n = 12. 
The maximum numbers of chromosomes is found in a protozoan (Radiolarian), where total number of chromosomes are 1600 i.e. 2n = 1600.

Statement I : All prokaryotes have a cell wall, eukaryotes do not.
Statement II : Prokaryotes have a true nucleus, eukaryotes have a primitive nucleus.

biology organization of life comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

  1. Both statement I and statement II are true and statement II is the correct explanation of statement I.

  2. Both statement I and statement II are true but statement II is not the correct explanation of statement I.

  3. Statement I is true but statement II is false.

  4. Both statement I and statement II are false.

Show answer
Correct Option: D
Explanation:
Prokaryotes generally have a tough layer which helps to maintain the strength and rigidity of the cells known as the cell wall. All the prokaryotes do not possess cell walls such as Mycoplasma. Eukaryotes like animals lack cell walls it starts with plasma membrane while plants have a cell wall.
Prokaryotes have a primitive nucleus that lacks membrane while eukaryotes have a true nucleus that has a double membrane nucleus. Thus, the correct answer is option D.

Prokaryotic and eukaryotic flagella differ in

biology organization of life comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

  1. Type of movement and position

  2. Microtubular organisation and function

  3. Location and mode of functioning

  4. Microtubular organisation and type of movement.

Show answer
Correct Option: D
Explanation:

Prokaryotic and eukaryotic flagella have the same function in the organism. They both are located on the cell membrane. However, they differ in their structure and dynamics. Eukaryotic flagella are microtubule-based structures. They are attached to the cell at the cell membrane by basal bodies. Prokaryotic flagella are located outside of the plasma membrane. Prokaryotic flagella show rotatory movement. Whereas eukaryotic flagella show lashing movement. The movement of prokaryotic flagella is proton-driven whereas the movement of eukaryotic flagella is ATP driven. Eukaryotic flagella show 9 + 2 microtubules arrangement.

Thus, the correct answer is option D.

Sum of physical and chemical processes by which living matter is produced and maintained is called as

biology biology : an introduction introduction to organization of life signs of life what is living?

  1. Respiration

  2. Growth

  3. Metabolism

  4. Reproduction

Show answer
Correct Option: C
Explanation:
The chemical processes that occur within a living organism in order to maintain life. There are two main types of metabolic processes namely catabolic and anabolic processes. The catabolic process involves breaking down of material for eg. proteins to amino acids. Whereas the anabolic process involves synthesizing materials for eg. sugars formation from carbon dioxide, water, and oxygen.
Hence correct answer is "metabolism".

The attributes of living organisms are

biology biology : an introduction introduction to organization of life signs of life what is living?

  1. Reproduction

  2. Self consciousness

  3. Movement

  4. All of the above

Show answer
Correct Option: D
Explanation:

Living organisms are blessed with the capability to reproduce and increase in number. The living cell has cellular machinery which helps in cell division. The self-consciousness is the ability to react and respond to a particular stimulus which is due to the well developed nervous system which helps to analyse the generated response. Movement is another unique potential of a living organism which is possible due to a fully developed skeletal and muscular system.

So, the correct answer is option D.

Mosquitoes, ant, dung beetle, butterfly, moth and cockroach all have same

biology biology : an introduction introduction to organization of life signs of life what is living?

  1. Number of legs

  2. Segmentation

  3. Colour of the body

  4. Both A and B

Show answer
Correct Option: D
Explanation:

Mosquitoes, ant, dung beetle, butterfly, moth, and cockroach all belong to class Insecta of phylum Arthropoda. They have one pair of antennae, three pairs of legs, and three body regions i.e., head, thorax, and abdomen. Thus, the correct answer is option D.

How many (in number) of the following properties are the defining characteristics of living organisms?
Growth, reproduction, metabolism, cellular organisation, consciousness 

biology biology : an introduction introduction to organization of life signs of life what is living?

  1. 2

  2. 3

  3. 4

  4. 5

Show answer
Correct Option: C
Explanation:

Growth, metabolism, reproduction, and consciousness are the properties of living organisms. Cellular organization is living is given by cells and in non-living by atoms and molecules so it's not a property just belonging to living. 

Which of the following can be considered as parameter of old age?

biology biology : an introduction introduction to organization of life signs of life what is living?

  1. Slowing of metabolism

  2. End of reproductive phase

  3. Juvenile stage

  4. Enlargement of thymus

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Correct Option: A
Explanation:

  • Age is one of the most important factor for changes in energy metabolism. The basal metabolic rate decreases almost linearly with age. 
  • The volume of skeletal musculature decreases and the percentage of fat tissue increases with age. 
  • It is shown that a decrease in muscle mass relative to the total body may be wholly responsible for the age-related decrease in basal metabolic rate.

So, the correct answer is 'Slowing of metabolism'.

Tissue is the cellular organisational level intermediate between

biology biology : an introduction introduction to organization of life signs of life what is living?

  1. Cells and organs

  2. Organs and organ system

  3. Cells and organ system

  4. None of the above

Show answer
Correct Option: A
Explanation:

  • Tissue is a cellular organizational level intermediate between cells and a complete organ. 
  • A tissue is an ensemble of similar cells from the same origin that together carry out a specific function. 
  • Organs are then formed by the functional grouping together of multiple tissues.

Thus, the correct answer is option A.

The substance that triggers the fall of mature leaves and fruits from plants is due to

biology biology : an introduction introduction to organization of life signs of life what is living?

  1. auxin

  2. gibberellin

  3. abscistic acid

  4. cytokinin

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Correct Option: C
Explanation:

Abscistic acid is a plant hormone which promotes senescence of leaves and causes abscission of flowers and fruits.