Tag: botany

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Questions Related to botany

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

Salt respiration is?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Salt respiration refers to the observed increase in the rate of respiration in plant roots when they are placed in a salt solution, as energy is required for active mineral absorption.

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

Lecithin carrier theory of mineral absorption was proposed by.

  1. Pfeffer $(1900)$
  2. Lundegardh and Burstrom $(1933)$
  3. Bennet - Clark $(1956)$
  4. Lundegasdh and Pfeffer $(1964)$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Lecithin carrier theory, which proposes that phospholipids act as carriers for ions across the membrane, was proposed by Bennet-Clark in 1956.

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

Which of the following statement is incorrect?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

Metabolic water is the one

  1. Used during transamination

  2. Used during photosynthesis

  3. Produced during aerobic utilization of glucose

  4. Produced during condensation or polymerisation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Metabolic water is water produced by the body through metabolic processes. The aerobic respiration of glucose (C6H12O6 + 6O2 -> 6CO2 + 6H2O + energy) releases water as a byproduct.

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

Features of PUFA do not include

  1. Insoluble in $H _2O$

  2. High melting temperature

  3. Contains double bonds

  4. Lower occurrence of cardiovascular risks
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 


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

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

  1. Nitrogen

  2. Iron

  3. Magnesium

  4. Phosphorus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

So the correct answer is "phosphorus".

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In plant mineral absorption, the apoplast (outer space) consists of non-living components like cell walls and intercellular spaces. The symplast (inner space) consists of the living cytoplasm and the vacuole.

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

In feedback inhibition, a metabolic pathway is switched off by

  1. Lack of a substrate

  2. Accumulation of the end product

  3. A rise in temperature

  4. Competitive inhibition
Reveal answer Fill a bubble to check yourself
B Correct answer
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'. 

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

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

  1. Protein

  2. Carbohydrate

  3. Water

  4. None of these.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cytoplasm is primarily composed of water (70-90 percent). The elements C, N, O, and H are fundamental components of water molecules and organic biomolecules dissolved within the aqueous cytoplasm.