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Which of the following statements are correct?
1. Solution culture/Hydroponics contains all essential minerals except one, the usefulness of which is to be determined.
2. Na, Si, Co and Selenium are beneficial element required by higher plants.
3. Zn is the activator of nitrogenases while Mo is the activator of alcohol dehydrogenase.
4. Zn is needed for auxin synthesis.
  • a)
    All of these
  • b)
    I, II, III
  • c)
    I, II, IV
  • d)
    None of these
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Which of the following statements are correct?1. Solution culture/Hyd...
Zinc (Zn2+ ) is an activator of alcohol dehydrogenase and Mo of nitrogenase during nitrogen metabolism.
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Most Upvoted Answer
Which of the following statements are correct?1. Solution culture/Hyd...
I. Solution culture/Hydroponics and essential minerals

In hydroponics or solution culture, plants are grown in a nutrient-rich solution without the use of soil. The solution contains all the essential minerals required for plant growth, except for one mineral whose usefulness is yet to be determined.

This statement is correct. Solution culture or hydroponics indeed contains all essential minerals required for plant growth, except for one mineral whose specific function is still under investigation. The purpose of omitting this mineral is to study its role and determine its significance in plant growth and development.

II. Beneficial elements for higher plants

Several elements are considered beneficial for the growth and development of higher plants. These elements play important roles in various physiological processes and are required in small quantities.

Na, Si, Co, and Selenium are indeed beneficial elements required by higher plants. Sodium (Na) is involved in ion balance and osmotic regulation, silicon (Si) enhances plant resistance to various stresses, cobalt (Co) is a component of vitamin B12 and assists in nitrogen fixation, and selenium (Se) acts as an antioxidant and is involved in various enzymatic reactions.

III. Zn and Mo as activators

Zinc (Zn) and Molybdenum (Mo) are essential micronutrients for plants and are involved in various enzymatic reactions.

Zinc is not the activator of nitrogenases. Nitrogenases are enzymes involved in nitrogen fixation, and their activity is dependent on the presence of molybdenum (Mo). Mo acts as a cofactor for nitrogenase enzymes, enabling them to convert atmospheric nitrogen into a usable form for plants.

Mo is not the activator of alcohol dehydrogenase. Alcohol dehydrogenase is an enzyme involved in the metabolism of alcohols in plants. The activity of alcohol dehydrogenase is not dependent on molybdenum but rather on other factors such as the availability of NAD(P)H cofactors.

IV. Zn and auxin synthesis

Zinc (Zn) is indeed needed for auxin synthesis. Auxins are a class of plant hormones responsible for various physiological processes, including cell division, elongation, and differentiation. Zinc is required as a cofactor for the enzyme tryptophan aminotransferase, which is involved in auxin synthesis.

Therefore, the correct statements are:
- Solution culture/hydroponics contains all essential minerals except one, the usefulness of which is to be determined.
- Na, Si, Co, and Selenium are beneficial elements required by higher plants.
- Zn is needed for auxin synthesis.

Hence, the correct answer is option C: I, II, IV.
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Which of the following statements are correct?1. Solution culture/Hydroponics contains all essential minerals except one, the usefulness of which is to be determined.2. Na, Si, Co and Selenium are beneficial element required by higher plants.3. Zn is the activator of nitrogenases while Mo is the activator of alcohol dehydrogenase.4. Zn is needed for auxin synthesis.a)All of theseb)I, II, IIIc)I, II, IVd)None of theseCorrect answer is option 'C'. Can you explain this answer?
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