Tag: biology

Questions Related to biology

The character of an ecosystem is determined by the environmental factor, which is shortest in supply, this is called as

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

  1. Law of minimum

  2. Law of diminishing returns

  3. Law of limiting factors

  4. Law of supply and demand

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Correct Option: A
Explanation:

Law of minimum is popularly known as Leibig's law of minimum. 

According to this law the growth is controlled not by the total amount of resources available, but by the scarcest resource (called as limiting factor). 
It has wide ranging applications and one application is ecology. In ecological studies the character of an ecosystem is determined by the environmental factor, which is shortest in supply. For example, type of forest will be decided not by light or soil but by water availability. If water is present in less amount, no matter how abundant is the supply of other resources, only thorny or scrub forests will develop.

Oxygen $(O _2)$ is utilised by an organism to?

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

  1. Perform formation of nutritive molecules

  2. Breakdown the nutrient molecules

  3. Obtain nourishment from the food

  4. Burn the organic compounds directly

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Correct Option: A

The Hydroponics is most closely related to which among the following?

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

  1. Grafting of Plants

  2. Water conservation

  3. Study of Vegetable

  4. Soilless culture of Plants

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Correct Option: D

Mycorrhizal fungi mobilize nutrients from soils to roots of plants. The nutrient in question is?

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

  1. Organic acid

  2. Phosphorus

  3. Manganese

  4. Potassium

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Correct Option: A

Regarding the mineral nutrition of plants, which one of the following statements is correct?

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

  1. The availability of iron to plants decrease with the increase of acidity of the soil

  2. The presence of $CO _2$ dissolved in the soil water reduces the solubility of carbonates of lime in it

  3. Molybdenum is a constituent of nitrate reductase system

  4. Sulphur is a constituent of phenylalanine

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Correct Option: A

Which one of the following is popularly associated with the name of Justus Liebig?

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

  1. Law of the Minimum

  2. Law of Tolerance

  3. Ecological Niche

  4. Speciation

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Correct Option: A

Which one of the following statements correctly fines the term hydroponics?

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

  1. Growing plants in soil less culture

  2. Culture of fishes by varying the water supply

  3. Growing planktons on the surface of water

  4. Growing plants in sterilized soil

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Correct Option: A

Match List-I(mode of nutrition in bacteria) with List-II(examples of bacteria) and select the correct answer.

List-I List-II
a. Photoautotroph $1$. Escherichia coli
b. Chemoautotroph $2$. Rhodospirillum rubrum
c. Photocheterotroph $3$. Chlorobium sp.
d. Chemoheterotroph $4$. Nitrosomonas sp.
biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants

  1. A-$4$, B-$3$, C-$2$, D-$1$

  2. A-$3$, B-$4$, C-$1$, D-$2$

  3. A-$3$, B-$4$, C-$2$, D-$1$

  4. A-$4$, B-$3$, C-$1$, D-$2$

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Correct Option: A

Match List I (nutrient) with List II(deficiency symptom in leaf) and select the correct answer using the codes given the lists.

List-I List-II
a. Phosphorus $1$. Lower leaves yellow between veins; purplish color of petiole
b. Potassium $2$. Discoloration of leaf, starting from margins and extending towards mid-rib
c. Manganese $3$. Dead tissues around the margins and in between the veins of the leaves
d. Calcium $4$. Development of chlorosis in patches in dicots and in stripes in monocots
biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants

  1. A-$1$, B-$2$, C-$3$, D-$4$

  2. A-$2$, B-$1$, C-$3$, D-$4$

  3. A-$1$, B-$2$, C-$4$, D-$3$

  4. A-$2$, B-$1$, C-$4$, D-$3$

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Correct Option: A

Choose the correct answer from the alternatives given.
The mineral element essential for nitrogen merabolisrn is:

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

  1. Zn

  2. $Mn^{2+}$

  3. Mo

  4. $Al^{3+}$

Show answer
Correct Option: C
Explanation:

Mo is a cofactor for enzyme nitrogenase, which is the most crucial enzyme for nitrogen fixation.

So, the correct option is 'Mo'