Plant Physiology

Step 1: Understanding the Concept:
The question asks for the primary use of Maleic hydrazide (MH) in agriculture, particularly in post-harvest management.

Step 2: Detailed Explanation:
Maleic hydrazide is a plant growth regulator. Its main function is to inhibit cell division. When sprayed on crops like potatoes and onions in the field before harvest, it is absorbed by the plant and translocated to the storage organs (tubers or bulbs). During storage, it effectively inhibits cell division in the dormant buds, thereby preventing sprouting. Sprouting reduces the quality and storage life of these commodities. MH does not enhance ripening (ethylene does) or maturity. While controlling sprouting is a form of value addition, its specific physiological function is sprout control.

Step 3: Final Answer:
Maleic hydrazide is used to control sprouting, especially in potatoes and onions.

Step 1: Understanding the Concept:
Fruits are classified based on their ripening behavior into two categories:
The question asks to identify the non-climacteric fruits from the given list.

Step 2: Detailed Explanation:
Let's classify each fruit:
Based on this classification, Litchi, Grape, and Pineapple are non-climacteric fruits.

Step 3: Final Answer:
The non-climacteric fruits in the list are (A) Litchi, (B) Grape, and (D) Pineapple. This corresponds to the option (A), (B) and (D) only.

Step 1: Understanding the Concept:
The question asks about the general change in the texture (firmness) of fruits as they are stored.

Step 2: Detailed Explanation:
During storage, fruits undergo ripening and senescence (aging). A key process during ripening is softening. This is caused by the enzymatic breakdown of structural components in the cell walls. The primary "glue" that holds plant cells together is pectin. Enzymes like polygalacturonase (PG) and pectin methylesterase (PME) break down this pectin into soluble forms, weakening the cell walls and the bonds between cells. This results in the fruit becoming softer. Therefore, as storage progresses, the firmness of most fruits generally reduces.

Step 3: Final Answer:
The firmness of fruit reduces during storage.

Step 1: Understanding the Concept:
The question asks to identify the plant hormone responsible for increasing the rate of respiration in fruits during storage, a process associated with ripening.

Step 2: Detailed Explanation:
In climacteric fruits (like bananas, mangoes, apples), the ripening process is marked by a sharp increase in the rate of respiration, known as the "climacteric rise". This rise is triggered by the plant hormone ethylene. Ethylene acts as a signaling molecule that initiates a cascade of events leading to ripening, including color change, softening, and aroma development, all of which are energy-intensive processes fueled by respiration.

Step 3: Final Answer:
Ethylene is the hormone that increases the respiration rate during storage.

Step 1: Understanding the Concept:
The question requires matching common physiological disorders in plants with their corresponding nutritional cause (deficiency or toxicity).

Step 2: Detailed Explanation:
Let's match each disorder to its cause:
The correct matching is: A II, B I, C IV, D III.

Step 3: Final Answer:
The correct set of matches corresponds to option 1.

Step 1: Understanding the Concept:
This question asks to classify the Pineapple plant based on its photosynthetic pathway. There are three major pathways: C3, C4, and CAM.

Step 2: Detailed Explanation:
Pineapple (Ananas comosus) is a classic textbook example of a CAM plant. This adaptation allows it to thrive in conditions where water conservation is crucial. Other CAM plants include cacti, succulents, and agave. (Note: C2 pathway refers to photorespiration, not a primary photosynthetic pathway).

Step 3: Final Answer:
Pineapple is a CAM plant.

Step 1: Understanding the Concept:
The question asks to classify the strawberry plant based on its photoperiodic response for flowering. Photoperiodism is the physiological reaction of organisms to the length of day or night.

Step 2: Detailed Explanation:
Plants are classified into three main groups based on their photoperiodic response:
Most traditional and commercially important strawberry cultivars (Fragaria × ananassa) are short-day plants. They initiate flower buds during the short days of autumn and winter, which then develop and produce fruit in the spring. While long-day and day-neutral varieties have been developed, the typical classification for strawberry is as a short-day plant.

Step 3: Final Answer:
Strawberry is typically a short-day plant.

Step 1: Understanding the Concept:
This question requires matching specific horticultural applications with the Plant Bioregulator (PBR) or chemical used to achieve them.

Step 2: Detailed Explanation:
Let's match each application to the chemical:
The correct matching is: A III, B I, C II, D IV.

Step 3: Final Answer:
The correct set of matches corresponds to option 2.

Step 1: Understanding the Concept:
This question requires matching major classes of Plant Growth Regulators (PGRs) with their primary practical applications in horticulture.

Step 2: Detailed Explanation:
Let's match each PGR to its utility:
The correct matching is: A II, B III, C IV, D I.

Step 3: Final Answer:
The correct set of matches corresponds to option 1.

Concept: Different garden styles have unique architectural and landscape features. Mughal gardens are known for their symmetry, water channels, terraces, and structures like Baradari.
Step 1: Understanding Baradari.
A Baradari is a pavilion with twelve doors designed to allow free flow of air and provide a resting place.
Step 2: Association with garden style.
Baradaris are commonly found in Mughal gardens, reflecting Persian-influenced architecture.
Step 3: Evaluating the options.

• Mughal Garden Known for Baradari structures (correct)
• Japanese Garden Focuses on natural scenery (incorrect)
• English Garden Informal and landscape-oriented (incorrect)
• Formal Garden General category, not specific to Baradari (incorrect)

Step 4: Additional insight.
Famous Mughal gardens like Shalimar Bagh and Nishat Bagh feature Baradaris as central attractions.
Step 5: Conclusion.
Thus, Baradari is a typical feature of Mughal gardens.