Tag: botany

Questions Related to botany

Slow rate of absorption of ion at high temperature is due to

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Low photosynthetic rate

  2. Low rate of transpiration

  3. Enzyme inactivation

  4. All the above

Show answer
Correct Option: C
Explanation:

At high temperature more than 500500 C the enzymes become inactive which effect the rate of absorption of minerals from soil.

Salt respiration is?

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Linking of ion movement with respiratory chain

  2. Active increase in respiration during mineral absorption

  3. Decrease in respiration during salt absorption

  4. Secretion of salt through respiratory channels

Show answer
Correct Option: B

Lecithin carrier theory of mineral absorption was proposed by.

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Pfeffer $(1900)$

  2. Lundegardh and Burstrom $(1933)$

  3. Bennet - Clark $(1956)$

  4. Lundegasdh and Pfeffer $(1964)$

Show answer
Correct Option: C

Which of the following statement is incorrect?

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Rise of water in a narrow tube is inversely proportional to the radius of the tube

  2. A water melon has over 92% water

  3. Dry plant material can imbibe ether but rubber cannot imbibe

  4. when water flows into thew cells and out of the cell and are in equilibrium, the cells are said to be flaccid

Show answer
Correct Option: A

Metabolic water is the one

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Used during transamination

  2. Used during photosynthesis

  3. Produced during aerobic utilization of glucose

  4. Produced during condensation or polymerisation

Show answer
Correct Option: C

Features of PUFA do not include

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Insoluble in $H _2O$

  2. High melting temperature

  3. Contains double bonds

  4. Lower occurrence of cardiovascular risks

Show answer
Correct Option: B
Explanation:

PUFA or polyunsaturated fatty acids are not soluble in water. They have more than one double bond in their fatty acid chain. Polyunsaturated fatty acids (PUFA) contain multiple double bonds and are not stacked together that leads to the weaker intermolecular interaction; as a result, the melting point of PUFA has a lower melting point. PUFA improves blood cholesterol levels and thus lower the risk of cardiovascular diseases. 

So, the correct answer is option B, High melting temperature. 


Choose the correct answer from the alternatives given.
Which of the following minerals is required for all phosphorylation reactions?

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Nitrogen

  2. Iron

  3. Magnesium

  4. Phosphorus

Show answer
Correct Option: D
Explanation:

Phosphorylation is a biochemical process that involves the addition of phosphate to an organic compound.

So the correct answer is "phosphorus".

With reference to absorption of minerals, the term 'outer space' represents ______ while 'inner space' represents _______. 

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Intercellular space and cell wall; cytoplasm and vacuole

  2. Cytoplasm and vacuole; intercellular space and cell wall

  3. Intercellular space; vacuole

  4. Cytoplasm; vacuole

Show answer
Correct Option: A

In feedback inhibition, a metabolic pathway is switched off by

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Lack of a substrate

  2. Accumulation of the end product

  3. A rise in temperature

  4. Competitive inhibition

Show answer
Correct Option: B
Explanation:

Accumulation of the end product triggers inhibition or switching off of the metabolic pathway in feedback inhibition mechanism. 

So, the correct option is 'Accumulation of the end product'. 

The main constituents of cytoplasm is C, N, O, H. These are derived from-

botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

  1. Protein

  2. Carbohydrate

  3. Water

  4. None of these.

Show answer
Correct Option: C