Lesson 2 ·Class 9 · Seeds — Structure and Germination · Sort Lab
Classifying Seeds
Where the food is stored, and how many seed leaves.
Sort each seed or feature into its group.
Sorted 0/8
All items sorted — check each bin.
Free play — sort every item into the bin it belongs in; each correct drop tells you why. Switch to when you're ready to test yourself.
Two questions, asked separately: how many cotyledons, and is the endosperm still there? Castor is a dicot AND albuminous.
What this lesson covers
Challenges to clear
- Fill the Monocot bin correctly.
- Sort every item.
- Fill the Albuminous box — seeds that keep their food in the endosperm.
The task
Sort each seed or feature into its group.
What this lesson covers
- Dicot — Two cotyledons: Embryo has two seed leaves (They usually store the food themselves.); Bean, pea and gram (Split one open and it falls into two halves.)
- Monocot — One cotyledon: Embryo has a single seed leaf (In cereals it is a shield-shaped scutellum.); Maize, wheat and rice (They will not split into two equal halves.)
- Albuminous — Endosperm kept: Endosperm persists and stores the food (The cotyledon absorbs from it during germination.); Castor and maize seeds (Castor is a dicot that is still albuminous — the two classifications are independent.)
- Exalbuminous — Endosperm used up: Endosperm is completely absorbed before the seed matures (The food ends up stored in swollen cotyledons instead.); Pea and gram seeds (Their fat cotyledons are the food store.)
Hint
Two questions, asked separately: how many cotyledons, and is the endosperm still there? Castor is a dicot AND albuminous.