(a) Enlist the different commercial flowers cultivated on a large scale for cut flower trade. Briefly discuss the factors…

(a) Commercial Cut Flowers and Keeping Quality The major commercial flowers cultivated on a large scale for the cut flower trade in India include rose, carnation, chrysanthemum, gerbera, orchid, anthurium, lily, and gladiolus. While tulips are globally significant, they are not cultivated on a large scale for the cut flower trade in India due to climatic constraints. Production is concentrated in hubs like Bengaluru, Pune, and Hyderabad, which offer favorable microclimates.

The keeping quality of cut flowers is determined by post-harvest physiology, primarily governed by ethylene biosynthesis. Ethylene production is initiated by ACC synthase and completed by ACC oxidase, leading to senescence. Other critical factors include water stress, which causes wilting; temperature fluctuations that accelerate respiration; and microbial load, which leads to stem blockage and decay. Additionally, membrane integrity loss and carbohydrate depletion reduce vase life.

Remedies involve a robust cold chain and chemical interventions. For ethylene-sensitive species, Silver Thiosulphate (STS) or 1-methylcyclopropene (1-MCP) are used to inhibit ethylene action, while 8-Hydroxyquinoline citrate (8-HQC) acts as a germicide. Pulsing solutions with sugars and preservatives enhance energy reserves and antimicrobial properties. Crucially, refrigerated transport must be species-specific; while temperate flowers like roses tolerate 2–5°C, tropical species like orchids and anthurium are chilling-sensitive and require higher temperatures, often 7–15°C, to prevent cellular damage.

(b) Photorespiration and its Relationship with Photosynthesis Photorespiration is a metabolic pathway that reduces the efficiency of photosynthesis. It occurs when Rubisco, the key enzyme in carbon fixation, acts as an oxygenase rather than a carboxylase, binding with O2 instead of CO2. This initiates the C2 cycle, where glycolate is processed through a shuttle involving chloroplasts, peroxisomes, and mitochondria. The cycle consumes ATP and reducing power, releases previously fixed CO2 (and NH3) in the mitochondria when glycine is converted to serine, and can cost C3 plants roughly a quarter of the carbon they fix under warm conditions.

The relationship between photorespiration and photosynthesis is one of competitive inhibition at the Rubisco active site. The ratio of CO2 to O2 determines the enzyme's preference; high O2/CO2 ratios favor oxygenation. This mechanism is an evolutionary trade-off. In C3 plants, photorespiration is high, acting as a safety valve against photoinhibition but reducing yield. In contrast, C4 and CAM plants have evolved spatial or temporal separation of carbon fixation to minimize photorespiration, thereby enhancing photosynthetic efficiency under high light and temperature conditions.

(c) Challenges in India’s Food Processing Industry The growth of India’s food processing industry faces several structural and policy challenges. Low processing levels and fragmented supply chains are the primary issue: MoFPI's 2021 Level-of-Processing study found only about 4.5% of fruits and 2.7% of vegetables processed (milk 21.1%), so post-harvest losses stay high.

Infrastructure deficits persist, particularly in the aggregation capabilities of Farmer Producer Organizations (FPOs) and the underutilization of Mega Food Parks under the PM Kisan SAMPADA Yojana. Compliance costs for Micro, Small, and Medium Enterprises (MSMEs) remain high due to stringent FSSAI regulations and GST classification disputes (partly eased by the 2025 rate rationalisation). Furthermore, enforcement of contract farming agreements is weak, leading to disputes between processors and farmers.

Export challenges are compounded by Maximum Residue Limit (MRL) issues, resulting in rejections from stringent markets like the EU and US. Policy implementation bottlenecks, such as delays in cold chain development and lack of standardized grading, further hinder value addition. Government responses such as PM Kisan SAMPADA Yojana, the PLI scheme for food processing and PMFME for micro units address parts of these gaps.