Across
- 6. - The mechanism that transfers pollen grains from the anther to the stigma.
- 8. - The hard outer layer of a pollen grain made up of highly resistant sporopollenin.
- 9. - The innermost wall layer of a microsporangium that nourishes the developing pollen grains.
- 10. - Flowers that do not open at all and are invariably autogamous.
Down
- 1. - The female reproductive part of the flower.
- 2. - A hollow foliar structure enclosing the shoot apex and leaf primordia in grass embryos.
- 3. - A mass of cells enclosed within the ovule's integuments, having abundant reserve food materials.
- 4. - The stalk that attaches the ovule to the placenta.
- 5. - The thin and continuous inner wall of the pollen grain made up of cellulose and pectin.
- 7. - The male reproductive organ of a flower consisting of a whorl of stamens.