Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

Which of the following statements is not correct?

  1. In plant cells, vacuoles are absent.

  2. Vacuole is bounded by a single membrane.

  3. In Amoeba, contractile vacuole is important for excretion.

  4. Flagellum is important for transport of bacteria.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plant cells typically have large central vacuoles, which are essential for maintaining turgor pressure and storage. Therefore, the statement that vacuoles are absent in plant cells is incorrect.

Multiple choice bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

Passage of cell contents out of the cell. Water potential can be calculated as : 

  1. $\pi + WP$
  2. $\Psi + WP $

  3. Osmotic potential + TP
  4. $\pi + TP$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Water potential is the energy potential of water compared to pure water in a system when both temperature and pressure are same .
  •  When the contents of the the cell moves out then then the wall pressure or turgour pressure will decrease .
So the correct answer is ' B ' . 

Multiple choice bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

Red blood cells when placed in a hypotonic solution will ______.This process is known as ______.

  1. Shrink, crenation

  2. Swell up, plasmolysis

  3. Turgid, deplasmolysis

  4. Burst, haemolysis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Crenation is defined as the process by which a blood cell shrinks when it is exposed to a hypotonic solution.

Multiple choice bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

The value of $2, 4$-D is $25$ ppm. How many amount of $2, 4$-D should require for making its $5$ litres, $15$ litres and $25$ litres solutions respectively.

  1. $25$gm, $50$gm, $75$gm
  2. $50$gm, $175$gm, $525$gm
  3. $250$gm, $750$gm, $1250$gm
  4. $125$gm, $375$gm, $625$gm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

1 ppm is equal to 1 gm per litre.

25 ppm is equal to 25 gm per litre.
Therefore, 
for 5 litres, amount needed is 5 times 25= 125 gm
for 15 litres, amount needed is 15 times 25= 375 gm
for 25 litres, amount needed is 25 times 25= 625 gm.
So the correct option is D.

Multiple choice bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

Plant cells do not burst in distilled water, because

  1. Cells wall is rigid and do not get overstretched

  2. Cell wall is living

  3. Cell wall is the outer most layer of plant cell

  4. Cell wall is permeable
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cell wall is the outermost, rigid, protective, non living and supportive layer found in all the plant cells. Due to its rigid nature it prevent the cell from bursting. It is not found in animal cells. An animal cell placed in pure water will swell up and burst, because of endosmosis.