Tag: mineral absorption

Questions Related to mineral absorption

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

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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

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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.

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Correct Option: C

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.

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

  1. inner, not freely, active, requires

  2. inner, freely, passive, requires

  3. outer, freely, passive, does not require

  4. outer, not freely, active, requires.

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Correct Option: C
Explanation:

In the principal stage, an underlying fast take-up of particles into the 'free space' or 'space' of cells the apoplast, is detached.

So, the correct option is 'outer, freely, passive, does not require'.

Choose the correct option

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

  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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Correct Option: A

The earliest undoubled vascular plants are found in the rocks of ______________.

botany plant physiology mechanism of absorption mineral absorption significance of transpiration transport of food, water and minerals mineral transport

  1. Early Cambrian

  2. Early Devonian

  3. Mid-creataceous

  4. Not until the beginning of Quaternary

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Correct Option: A

Choose the correct answer from the alternatives given.
Minerals enter a plant mainly by:

botany plant physiology mechanism of absorption mineral absorption significance of transpiration transport of food, water and minerals mineral transport

  1. diffusion

  2. pressure flow

  3. translocation

  4. active transport

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Correct Option: D
Explanation:

Active transport is a process that is required to move molecules against a concentration gradient. For plants to take up mineral ions, ions are moved into root hairs, where they are in a higher concentration than in the dilute solutions in the soil. So, the correct answer is "Active Transport".

Which of the following is not a type of potometer ?

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Ganong's

  2. Darwin's

  3. Newton's

  4. None of these

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Correct Option: C
Explanation:

Types of Potometer are:-

  • Bubble potometer
  • Mass potometer
  • Ganong's potometer
  • Darwin's potometer

Approx. _______ of the water absorbed by a plant is lost in transpiration.

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. 20-40%

  2. 98-99%

  3. 1-2%

  4. 6-8%

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Correct Option: B
Explanation:

Approx. 98-99% of the water absorbed by a plant is lost in transpiration. Hardly 0.2% is used in photosynthesis while the remaining is retained in the plant during growth.

Significance of transpiration lies in

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Circulation of water

  2. Absorption and distribution of water

  3. Regulating the temperature of the plant body

  4. All of the above

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Correct Option: D
Explanation:

Transpiration generates tension in plants. This tension is the main pulling force which pulls water to great heights in vascular plants. Thus, transpiration leads to the ascent of sap. Without transpiration water and minerals will not rise from roots to aerial parts of plants and trees. Transpiration also causes surface cooling of leaves and hence regulates the temperature of the plant body. At the same time, it is essentially a wasteful process. As much as 99 percent of water absorbed by a plant goes waste into the atmosphere. Thus, transpiration has been called as a necessary evil.