Plant Pathology - Study Mode

[#156] Plants growing in urea sprayed but Mg deficient soil will show
Correct Answer

(D) Yellowing of leaves

Explanation

Solution: Plants growing in urea sprayed but Mg deficient soil will show yellowing of leaves. Magnesium is the central core of the chlorophyll molecule in plant tissue. Thus, if Mg is deficient, the shortage of chlorophyll results in poor and stunted plant growth along with yellowing of leaves. Magnesium also helps to activate specific enzyme systems. A plant growing in magnesium-deficient soil would show chlorosis inspite of being sprayed with urea (nitrogen).

[#157] Who done most of his work on rust diseases in India
Correct Answer

(B) K. C. Mehta

Explanation

Solution: K. C. Mehta has done most of his work on rust diseases in India. The annual recurrence of stem rust of wheat in North Indian plains was discovered by Prof. K. C. Mehta. Since the 1950s, wheat strains bred to be resistant to stem rust have become available. He worked on the recurrence of wheat rusts in the plainlands of India. He found that though the rust spores were killed by the summer heat, new spores were blown in from the hills causing fresh infections every year.

[#158] Loose smut is controlled by
Correct Answer

(B) Seed treatment

Explanation

Solution: Loose smut is controlled by Seed treatment. Since loose smut fungus depends on seed for its survival and carries over from one season to another, growing disease free seed is the only alternative method of control available at present for large scale adoption. Treat the seed with Vitavax at the rate of 2.5 g per kg of seed before planting. Solar heat treatment of infected seed is highly valuable in the hot summer areas of the plains to make seed disease free. On a bright sunny day in the last week of May or first week of June. Soak the seed in water for about four hours in the morning and then dry it under hot sun in the afternoon. Store the well dried seed for use in next wheat season. The seed soaking activates the dormant fungus in the seed and heat of the sun kills it.

[#159] What is the importance of respiration in plants?
Correct Answer

(A) It liberates energy

Explanation

Solution: The importance of respiration in plants is it liberates energy. Cellular respiration is a process that occurs in the mitochondria of all organisms. In this process, both plants and animals break down simple sugars into carbon dioxide and water and release energy in the form of adenosine triphosphate (ATP).

[#160] Inorganic nutriens are present in the soil as
Correct Answer

(C) Electrically charged ions

Explanation

Solution: Inorganic nutrients are present in the soil as electrically charged ions. Inorganic nutrients, such as nitrogen and phosphorus, are important in the distribution and the abundance of living things. Plants obtain these inorganic nutrients from the soil when water moves into the plant through the roots. e.g : Plants can take up two forms of nitrogen, nitrate (NO 3 - ) and ammonium (NH 4 - ).