Tag: cell division in embryo development

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Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

What is an isotonic solution?

  1. A solution whose water concentration is lower than the internal concentration.

  2. A solution whose water concentration is same as compared to internal concentration.

  3. A solution whose water concentration is more than the internal concentration.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • If both the medium and cell has exactly the same water concentration and thus, there will be no net movement of water across the cell membrane is known as an isotonic solution. 
  • The cells remain of the same size.

    Hence, the correct option is B.
Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

In a hypotonic solution, the cell 

  1. Shrinks

  2. Remains of the same size

  3. Swells

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hypotonic solution is a type of solution in which water concentration in the medium is more than the cell. Water crosses the membrane in both directions, but more water will come into the cell than will leave. The net result is that the water enters the cell. The cells will swell up. 

Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

Solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell is a 

  1. Hypertonic solution

  2. Isotonic solution

  3. Hypotonic solution

  4. Both A and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A hypertonic solution is a particular type of solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell. Water crosses the cell membrane in both directions, but more water leaves the cell than enters it. Therefore, the cell will shrink due to exosmosis.

Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

If a cell is in a hypotonic environment, this means

  1. There are fewer solutes inside the cell than in the extra-cellular environment

  2. There is an equal amount of solutes inside as outside the cell

  3. There is more solute outside the cell than in the cell

  4. There is less solute outside the cell than inside of the cell
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A hypotonic environment is when the solute concentration outside the cell is less than inside the cell.

When both the regions have the same solute concentration it is an isotonic environment.
When the solute concentration outside the cell is higher than inside the cell then it is in a hypertonic environment.
So the correct answer is 'There is less solute outside the cell than inside the cell'.

Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

Roots will absorb water when external medium will be

  1. Hypotonic

  2. Hypertonic

  3. Isotonic

  4. Concentrated
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Osmosis happens along a concentration gradient. If outside medium is hypotonic, it means that relatively more of water is present outside the cells in the surrounding medium and water will flow inside the root hair cells.

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Generally, decline in hearing power begins after the age of 

  1. 50 years

  2. 30 years

  3. 40 years

  4. 10 years
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ageing is the process where there is a continuous decline in the metabolism of the body. The hearing power also declines after the age of 40 years. Presbycusis is the term which is generally used for hearing impairment due to old age. It is mainly caused due to degeneration of the cochlea or associated structures of the inner ear or auditory nerves.

So, the correct answer is option C.

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Cell which keeps changing it's shape is called

  1. Spirilla

  2. Pleomorphic

  3. Symbiont

  4. Gram negative
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pleomorphic organisms, such as certain bacteria like Mycoplasma, lack a rigid cell wall and can readily alter their size and shape in response to environmental conditions. Spirilla are rigid spiral-shaped bacteria, while symbionts and gram negative refer to ecological relationships or cell wall staining properties.

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Power is regeneration is poor in.

  1. Brain cell

  2. Bone cell

  3. Chondroblasts

  4. Striated muscles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Brain cells (neurons) have very limited capacity for regeneration compared to other tissues like bone or muscle. This is why injuries to the central nervous system are often permanent.

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Storage sprouting of potato can be prevented by 

  1. IAA

  2. Maleic hydrazide

  3. Cytokinins

  4. Gibberellins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Maleic hydrazide : It is a growth retardant which checks cell division. So during seed storage this is applied for checking sprouting of potato tubers so that the importance of potato may not be lowered down.

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

The process of cell death involving DNA cleavage in cells is known as

  1. Necrosis

  2. Apoptosis

  3. Cytokinesis

  4. Endocytosis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Apoptosis is the process in living cells which results in the death of cells that are damaged, attacked by pathogens, cancerous cell, abnormal cell, etc. Such cells are identified by the cells of the immune system followed by the production of proteins that kills the cell by DNA cleavage. It is also called programmed cell death. Thus the correct answer is option A.