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Mechanism of absorption - class-XI

Mineral and water absorption mechanisms in plants, including carrier theories, ion channels, active transport, and salt respiration

14 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Generally, gravitational water is utilized by the plants.

  1. True
  2. False
Question 2 Multiple Choice (Single Answer)

Ion channels have been discovered by 

  1. Singer and Nicolson
  2. Garnier
  3. Robinson and Brown
  4. Neher and Sakmann.
Question 3 Multiple Choice (Single Answer)

Activation energy is required for

  1. Exothermal reactions
  2. Endothermal reactions
  3. Enzyme mediated reactions
  4. Starting all biochemical reactions
Question 4 Multiple Choice (Single Answer)

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

  1. Low photosynthetic rate
  2. Low rate of transpiration
  3. Enzyme inactivation
  4. All the above
Question 5 Multiple Choice (Single Answer)

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
Question 6 Multiple Choice (Single Answer)

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 $(1964)$
Question 7 Multiple Choice (Single Answer)

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
Question 8 Multiple Choice (Single Answer)

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
Question 9 Multiple Choice (Single Answer)

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
Question 10 Multiple Choice (Single Answer)

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
Question 11 Multiple Choice (Single Answer)

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
Question 12 Multiple Choice (Single Answer)

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

  1. Protein
  2. Carbohydrate
  3. Water
  4. None of these.
Question 13 Multiple Choice (Single Answer)

In the initial phase of mineral ion absorption, there is a rapid uptake of ions into ______ space of cells. Ions absorbed in this phase are ______ exchangable. It is _____ uptake as it ______ the expenditure of metabolic energy.

  1. inner, not freely, active, requires
  2. inner, freely, passive, requires
  3. outer, freely, passive, does not require
  4. outer, not freely, active, requires.
Question 14 Multiple Choice (Single Answer)

Choose the correct option

  1. $E\quad +\quad S\quad \longrightarrow \quad ES\quad \longrightarrow \quad E+P\quad \longrightarrow \quad EP$
  2. E\quad +\quad S\quad \longrightarrow \quad ES\quad \longrightarrow \quad EP\quad \longrightarrow \quad E+P
  3. E\quad +\quad S\quad \longrightarrow \quad ES\quad \longrightarrow \quad EP\quad \longrightarrow \quad E+P
  4. E\quad +\quad S\quad \longrightarrow \quad ES\quad \longrightarrow \quad EP\quad \longrightarrow \quad E+P
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