Tag: transport in the xylem of plants

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Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

Minerals which maintain cation-anion balance in cells are 

  1. Cl and K

  2. K and Fe

  3. Cl and Mg

  4. Ca and Mg
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Potassium (K) and Chloride (Cl) ions are the primary minerals responsible for maintaining the osmotic potential and cation-anion balance within plant cells.

Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

Mineral ion concentration in tissues that reduces, the dry weight of tissues by about 10% is considered as 

  1. Critical concentration

  2. Toxic concentration

  3. Optimum concentration

  4. Beneficial concentration
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In plant physiology, any mineral ion concentration that reduces the dry weight of tissues by about 10% is defined as the toxic concentration.

Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

The technique of hydroponics was first demonstrated by 

  1. M. Calvin (1961)

  2. Julius Von Sachs (1860)

  3. Arnon (1940)

  4. Hoagland (1940)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In 1860 Julius von Sachs, Professor of Botany at the University of Wurzburg, published the first standard formula for a nutrient solution that could be dissolved in water and in which plants could be successfully grown. The technique was termed “nutriculture”.  Now it is called Hydroponics.
Answer is B.

Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is:-

  1. Quinone

  2. Cytochrome

  3. Iron-sulphur protein

  4. Ferredoxin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the Z-scheme of photosynthesis, the primary electron acceptor from the excited chlorophyll molecule (P680) of photosystem II is Pheophytin, which is a type of Quinone.

Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

Which of the following is not a role played by Potassium in plant growth?

  1. Translocation of carbohydrates

  2. Maintaining anion-cation balance

  3. Opening and closing of stomata

  4. Synthesis of proteins

  5. Maintaining turgidity of cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Potassium is involved in stomatal opening, enzyme activation, and protein synthesis, but it is not directly responsible for the translocation of carbohydrates; that is primarily the role of Boron.

Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

Minerals that activate respiratory enzymes

  1. N and P

  2. Mg and Mn

  3. K and Ca

  4. S and Fe

  5. Cu and Bo
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Magnesium (Mg) is essential for the activation of enzymes involved in respiration and photosynthesis. Manganese (Mn) is also a key activator for several respiratory enzymes, including those in the Krebs cycle.

Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

Select the correct statement(s) regarding the solution culture techniques.

  1. Successful hydroponic culture requires a large volume of nutrient solution or frequent adjustment of the nutrient solution to prevent roots from producing radical changes in nutrient concentrations and pH of the medium.

  2. In nutrient film growth system, plant roots lie on the surface of a trough, and nutrient solutions flow in a thin layer along the trough over the roots.

  3. In aeroponics technique, plants are grown with their roots suspended in air while being sprayed continuously with a nutrient solution.

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydroponic systems include various methods like nutrient film technique (NFT) and aeroponics. All the statements provided accurately describe the principles of these specific soilless culture techniques.

Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

Enzyme pepsin acts upon food at a pH of about

  1. 3 to split proteins

  2. 2 to split carbohydrate

  3. 7 to change protein into peptones

  4. 2 to change protein in amino acids
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pepsin enzymes are the enzymes that help in degradation of the proteins into various components like peptones. These enzymes are mostly found in stomach which has acidic pH.

Hence, the correct answer is '3 to split proteins'.

Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants hydroponics hydroculture

Choose the correct answer from the alternatives given.
In plants a common symptom caused by deficiencies of Ca, K, Mg and P is the:

  1. appearance of a dead necrotic area

  2. poor development of vasculature

  3. bending of the leaf tip

  4. formation of carotenes in plenty
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Deficiency symptoms of Ca, K, Mg and P appear initially as localized tissue necrosis leading to stunted plant growth, necrotic leaf margins on young leaves or curling of the leaves, and eventual death of terminal buds and root tips.

So the correct answer is "appearance of a dead necrotic area".