Plant Pathology - Study Mode

[#631] Enzyme required in early CO 2 fixation in C 4 cycle is
Correct Answer

(C) PEP carboxylase

Explanation

Solution: The enzyme required in early CO 2 fixation in the C 4 cycle is PEP carboxylase. PEP carboxylase, which is located in the mesophyll cells, is an essential enzyme in C 4 plants. It is an enzyme in the family of carboxy-lyases found in plants and some bacteria that catalyzes the addition of bicarbonate (HCO 3 - ) to phosphoenolpyruvate (PEP) to form the four-carbon compound oxaloacetate and inorganic phosphate.

[#632] How much usable energy. is available during oxidative combustion of 1 gm molecule of glucose in the body?
Correct Answer

(A) 686000 cal

Explanation

Solution: 686000 cal usable energy is available during oxidative combustion of 1 gm molecule of glucose in the body. Combustion involves a complete oxidation reaction where biomass reacts with excess oxygen at high temperatures (700 - 1400°C) to generate heat in the form of steam and other gaseous by-products such as carbon dioxide (CO 2 ) and water (H 2 O). Complete oxidation of one molecule of glucose results in the production of the equivalent of 38 molecules of ATP. 1 gram of glucose molecule yields 686 kcal, which is equivalent to 686000 calories of energy.

[#633] Match the following columns: Column I (Fertilisers) Column II (N Content %) a. CAN 1. 82 b. Anhydrous ammonia 2. 25 c. Urea 3. 33 d. Ammonium nitrate 4. 46
Correct Answer

(B) a-2, b-1, c-4, d-3

Explanation

Solution: CAN is calcium ammonium nitrate, also known as nitro-limestone or nitrochalk, and is a widely used inorganic fertilizer. It contains about 25% of nitrogen. Anhydrous ammonia is an efficient and widely used source of nitrogen fertilizer and its nitrogen content is 82%. Urea is the most important nitrogenous fertilizer in the country because of its high N content and which is 46%. Ammonium nitrate is a commonly used nitrogenous fertilizer and its nitrogen content is 33%.

[#634] Which is the 1 st systemic fungicide?
Correct Answer

(D) Carboxin

Explanation

Solution: Carboxin is the 1 st systemic fungicide. Carboxin is an anilide obtained by formal condensation of the amino group of aniline with the carboxy group of 2-methyl-5, 6-dihydro-1, 4-oxathiine-3-carboxylic acid. A fungicide for control of bunts and smuts normally is used for the treatment of seed. It has a role as a succinate dehydrogenase inhibitor and an antifungal agrochemical. It is an anilide, an enamide, an oxacycle, an organosulfur heterocyclic compound, an anilide fungicide and a secondary carboxamide.

[#635] Soil micro-organisms are most active at
Correct Answer

(D) 34° - 36°C

Explanation

Solution: Soil micro-organisms are most active at 34° - 36°C. Soil microbial activity that reflects the microbiological processes of soil microorganisms is the potential indicator of soil quality, as plants rely on soil microorganisms to mineralize organic nutrients for growth and development. Most soil microbes grow best at temperatures between 34 - 36° Celsius and their growth rates increase with increasing temperature up to a point.