Question

Which was the smallest seed and which was the biggest seed in your collection?

Answer 1

A mature ovule contains an embryo or a miniature immature plant, as well as food reserves, all of which are encased in a protective seed coat. Seeds are the means by which all blooming plants reproduce. Under the right climatic circumstances, such as the optimum temperature, moisture, and sunlight, any seed can germinate and grow into a new plant.
Gymnosperm seeds are naked and open to the environment, whereas angiosperm seeds (flowering plants) have a protective structure called the fruit. The egg inside the ovule is fertilised by a male nucleus through a pollen grain in both circumstances.

Complete answer:
Cumin (jeera) seeds were the smallest while mango seeds were the largest.
Cumin is a flowering plant in the Apiaceae family that is native to the Middle East and extends east to India. Its seeds, which are each encased within a dried fruit, are used whole or crushed in the cuisines of many countries.
Benefits of cumin- contains antioxidants, has anti-cancer properties, may help treat diarrhea, helps control blood sugar, fights bacteria and parasites, has an anti-inflammatory effect, helps lower cholesterol, aids in weight loss, boosts memory, improves symptoms of IBS.
Mango seed is a single flat oblong seed that, depending on the cultivar, can be fibrous or hairy on the surface. Inside the seed coat $1 - 2$ mm thick is a thin lining covering a single embryo, $4 - 7$cm long, $3 - 4$cm wide, and 1 cm thick.The kernel of the mango seed is encased in a tough covering.
The mango seed, also known as gutli, is commonly ingested as a powder or in the form of oil and butter. The mango guthli is edible, but only when the mango is immature. The seed of the mango becomes firm as it ripens, and it can only be utilised in powdered form.

Additional information:
Parts of a seed:
Seed Coat- The inside elements of a seed are protected by a seed coat. The seed is protected from the sun and water by a thick seed coat. It protects the seeds from losing water and parasites from entering. During unfavourable environmental circumstances, the stiff seed coatings impede germination
Endosperm- The endosperm is where the nutrients are kept. It gives the seed nourishment in the form of starch, carbs, and proteins to help the embryo germinate. It can be found beneath the seed coat.

Note:
There are two types of seeds:
Monocotyledonous seeds- On germination, these are made up of a single cotyledon that emerges from the seeds. Rice, for example.
Dicotyledonous seeds- On germination, they are two cotyledons that emerge from the seeds. Take, for example, tomatoes.
Embryo-A seed's embryo is the most vital component. It is diploid, having been created from a fertilised egg. The embryo contains all of the cells necessary for it to develop into a mature embryo.