Seeds are classified into two categories, i.e. orthodox and recalcitrant, depending on their physiological behaviour. Azadirachta indica (Neem) is a well-known medicinal plant that thrives well in tropical regions. There are different views regarding the nature of the Neem seeds. Some researchers say that it is orthodox, while others say it is recalcitrant by nature. The present study was carried out to classify the Neem seed, as proper categorization is important in terms of seed viability. Healthy seeds (average weight 0.32 g) were collected. Seed sowing for control was done immediately after collection of seeds, while for treatments (T₁ and T₂), the seeds were stored in different climatic conditions. For T₁, the seeds were air-dried (temperature 29.7 °C; relative humidity < 57%) and for T₂, the seeds were just kept in open tray (temperature 33.7 °C; relative humidity > 98%). The germination for control was 86%, while for T₂, it was 50%. No seed germination was observed in T₁. Likewise, for control and T₂, initiation of germination was 9.66 and 10.33 days, mean germination time was 8.33 and 11.98 days and germination rate was 1.94 and 1.77 per day, respectively. No germination in T₁, 30% increase in mean germination time and 9% poorer germination in T₂ indicated the limited tolerance of the Neem seeds towards desiccation. These findings along with the complete loss of viability in T₁ and poorer germination in T₂ in comparison with the control indicate the loss of moisture in seeds below critical limit, thus indicating the recalcitrant nature of the Neem seeds.

种子根据其生理行为分为两类，即正统种子和顽固种子。印楝(Neem) 是一种著名的药用植物，在热带地区生长良好。关于印楝种子的性质有不同的看法。一些研究人员说它是正统的，而另一些研究人员说它本质上是顽固的。本研究旨在对印楝种子进行分类，因为正确分类对种子活力很重要。收集健康种子（平均重量 0.32 克）。在收集种子后立即播种对照种子，而对于处理（T ₁和T ₂），将种子储存在不同的气候条件下。对于 T ₁，将种子风干（温度 29.7 °C；相对湿度 < 57%），对于 T ₂，种子仅保存在开口托盘中（温度 33.7 °C；相对湿度 > 98%）。对照的发芽率为86%，而T ₂的发芽率为50%。在T _{1 中}未观察到种子萌发。同样，对于对照和T ₂，萌发起始时间分别为9.66 和10.33 天，平均萌发时间为8.33 和11.98 天，发芽率分别为1.94 和1.77 天。T ₁没有发芽，平均发芽时间增加 30%，T ₂发芽差 9%表明印楝种子对干燥的耐受性有限。这些发现以及 T 中的生存力完全丧失₁和 T ₂中与对照相比较差的发芽表明种子中的水分损失低于临界极限，从而表明印楝种子的顽固性质。