Tag: biology

Questions Related to biology

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

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

  1. Critical concentration

  2. Toxic concentration

  3. Optimum concentration

  4. Beneficial concentration

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Correct Option: B

The technique of hydroponics was first demonstrated by 

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

  1. M. Calvin (1961)

  2. Julius Von Sachs (1860)

  3. Arnon (1940)

  4. Hoagland (1940)

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Correct Option: B
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.

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

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

  1. Quinone

  2. Cytochrome

  3. Iron-sulphur protein

  4. Ferredoxin

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Correct Option: A

Criteria of essentiality of nutrients in plants were given by.

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

  1. Stahl $(1923)$

  2. Benedict $(1927)$

  3. Arnon $(1938)$

  4. Sachs $(1860)$

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Correct Option: C

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

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

  1. Translocation of carbohydrates

  2. Maintaining anion-cation balance

  3. Opening and closing of stomata

  4. Synthesis of proteins

  5. Maintaining turgidity of cells

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Correct Option: A

Minerals that activate respiratory enzymes

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

  1. N and P

  2. Mg and Mn

  3. K and Ca

  4. S and Fe

  5. Cu and Bo

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Correct Option: B

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

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

  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

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Correct Option: D

Enzyme pepsin acts upon food at a pH of about

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

  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

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Correct Option: A
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'.

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

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

  1. appearance of a dead necrotic area

  2. poor development of vasculature

  3. bending of the leaf tip

  4. formation of carotenes in plenty

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Correct Option: A
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".

The inorganic essential elements which are obtained from the soil are called as 

biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants

  1. Mineral elements

  2. Non-mineral elements

  3. Non- essential elements

  4. Both (b) and (c)

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Correct Option: A