Tag: significance of transpiration

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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.

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

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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

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
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany plant physiology mechanism of absorption mineral absorption significance of transpiration transport of food, water and minerals mineral transport

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

  1. diffusion

  2. pressure flow

  3. translocation

  4. active transport
Reveal answer Fill a bubble to check yourself
D Correct answer
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".

Multiple choice botany the leaf mechanism of absorption mineral absorption significance of transpiration

Significance of transpiration lies in

  1. Circulation of water

  2. Absorption and distribution of water

  3. Regulating the temperature of the plant body

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.