Plant Pathology - Study Mode

[#691] Maximum starch is manufactured by
Correct Answer

(B) Palisade parenchyma

Explanation

Solution: Maximum starch is manufactured by Palisade parenchyma. The upper layer of ground tissue in a leaf, consisting of elongated cells beneath and perpendicular to the upper epidermis and constituting the primary area of photosynthesis is palisade parenchyma. The palisade parenchyma, is located beneath the upper epidermis and composed of columnar cells oriented perpendicular to the leaf surface. It contains the cylinder-shaped cells that hold the chloroplasts and constitutes the primary area of photosynthesis that converts the light energy to the chemical potential energy of carbohydrates.

[#692] In C 3 plants first stable product of photosynthesis during dark reaction is
Correct Answer

(A) PGA

Explanation

Solution: In C 3 plants first stable product of photosynthesis during dark reaction is PGA.
In glycolysis, 3-phosphoglycerate is an intermediate following the dephosphorylation (reduction) of 1,3-bisphosphoglycerate. The enzyme phosphoglycerate kinase catalyzes the phosphorylation of 3-PGA by ATP (which was produced in the light-dependent stage). 1,3-Bisphosphoglycerate (glycerate-1,3-bisphosphate) and ADP are the products. Photorespiration turns RuBP into 3-PGA and 2-phosphoglycolate, a 2-carbon molecule that can be converted via glycolate and glyoxalate to glycine.

[#693] For the first time who reported that a plant disease (fire blight of pear) was caused by bacterium (Erwinia amylovora) in 1882
Correct Answer

(D) T. J. Burill

Explanation

Solution: For the first time, T. J. Burrill reported that a plant disease (fire blight of pear) was caused by a bacterium (Erwinia amylovora) in 1882. The first studies on bacteria as plant disease agents were carried out by T. J. Burril in 1878 and concerned the fire blight disease of apples and pears, caused by Erwinia amylovora. Fire blight is a contagious disease affecting apples, pears, and some other members of the family Rosaceae. It is a serious concern to apple and pear producers. The causal pathogen is Erwinia amylovora, a Gram-negative bacterium. It is a short rod with rounded ends and many peritrichous flagella.

[#694] Rock phosphate is a suitable fertiliser for soils which are
Correct Answer

(A) Acidic

Explanation

Solution: Rock phosphate is a suitable fertilizer for Acidic soils. Rock phosphate (RP) is an important natural source of P and is used as raw material for the production of chemical phosphatic fertilizers. The direct application of RP has been found suitable for acidic soils as low pH helps to solubilize the RP and increases the available form of P to the plants. Use of phosphate rock is not usually recommended when the soil pH exceeds 5.5.

[#695] Perisperm is
Correct Answer

(D) Remains of nucellus

Explanation

Solution: Perisperm is remains of nucellus. Perisperm is a nutritive tissue of a seed derived from the nucellus and deposited externally to the embryo sac. The nucellus is the central and chief part of a plant ovule that encloses the female gametophyte.