Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

In a dried plant, an essential element that constitutes the bulk of its weight is Carbon.
As we know carbon is the most abundant element present within the plant that is obtained from the carbon dioxide from the air. Thus, carbon constitutes the maximum portion of its weight.

For the ascent of sap, capillary force theory was first proposed by Christian Wolf.
The ascent of sap in the xylem tissue of plants is the upward movement of water and minerals from the root to the aerial parts of the plant.
The Capillarity of the vessels and the normal atmospheric pressure are responsible for the ascent of sap. The vessel capillaries exert some force that helps to raise the water to a certain height of the stem.

Photooxidation is Photorespiration, Photolysis, and Light and oxygen-induced breakdown.
Photooxidation also known as the oxidative photosynthetic carbon cycle, refers to a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis.
It is a chemical reaction in which an inorganic chemical (or an organic chemical) is broken down by photons and is the interaction of one or more photons with one target molecule.

Stomata open when the guard cells possess more K⁺.
Guard cells accumulate potassium (K⁺), which results in stomatal opening and release K⁺, which results in stomatal closing.
Guard cells use osmotic pressure to open and close stomata, allowing plants to regulate the amount of water and solutes within them. For plants to produce energy and maintain cellular function, their cells undergo the highly intricate process of photosynthesis.

The risk of spoilage is less in salted pickles as it cause Plasmolysis.
Plasmolysis is a typical response of plant cells exposed to hyperosmotic stress. The loss of turgor causes the violent detachment of the living protoplast from the cell wall. The plasmolytic process is mainly driven by the vacuole. Plasmolysis is reversible (deplasmolysis) and characteristic of living plant cells.
Salting techniques improve the drying process and add antimicrobial agents that aid in the preservation of pickles.

Energy storing compound formed during the conversion of succinyl CoA to succinic acid is ATP.
Succinyl-CoA ligase also called succinate synthase, is an enzyme in the Krebs cycle that converts succinyl-CoA to succinate and free coenzyme A, and converts ADP or guanosine diphosphate (GDP) to ATP or guanosine triphosphate (GTP) respectively.
It is converted into succinate through the hydrolytic release of coenzyme A by succinyl-CoA synthetase.

An anther having four microsporocytes shall produce 16 pollen grains.
In heterosporous seedless vascular plants, modified leaves called microsporophylls bear microsporangia containing many microsporocytes that undergo meiosis, each producing four microspores.
Therefore an anther with four microsporocytes will produce a total of 16 pollen grains.

Bdellovibrio is a Gram -ve bacteria.
Bdellovibrio is highly motile, flagellated, tiny measuring about 0.25 × 1.0 μm, Gram-negative Deltaproteobacteria.
It is an obligate predatory bacterium that lives by attacking other Gram-negative bacteria, including a very wide range of human pathogens but does not predate on Gram-positive bacterial strains.

8 ascospores are enclosed in the mother cell and the ascus in ascomycetes.
The ascus is a sac-shaped cell present in ascomycete fungi; it is a reproductive cell in which meiosis and an additional cell division produce eight spores.
Ascospore is a sexually-produced spore from the ascus of an Ascomycetes fungus.

Chlorophyll consists of a Porphyrin head and phytol tail.
Chlorophyll is any of several related green pigments found in cyanobacteria and the chloroplasts of algae and plants.
A chlorophyll molecule consists of a porphyrin head (four pyrrole rings containing nitrogen arranged in a ring around a magnesium ion) and a long hydrocarbon tail.
Most chlorophylls are classified as chlorins, which are reduced relatives of porphyrins. They share a common biosynthetic pathway with porphyrins, including the precursor uroporphyrinogen III.