Q5. A grass floret has exposed feathery stigmas and anthers on long filaments. Which pollination mechanism do these features favour, and do they exclude self-pollination?
They favour wind pollination by helping release and intercept airborne pollen. They do not by themselves prove that every fertilisation involves another plant; self-pollination can also occur in grasses.
Q6. What are the silks of a maize cob?
The long styles of the female florets, one to each grain.
Q7. A wheat grain and a sunflower “seed” are both one-seeded dry fruits. Name each fruit and give one difference.
Wheat: a caryopsis, from a superior ovary, its wall fused with the seed coat. Sunflower: a cypsela, from an inferior ovary of two fused carpels, its wall free from the seed coat.
Q8. In maize, where are the male and female flowers?
In separate inflorescences: male in the tassel at the top, female in the cob lower down.
Q9. Which grass is used for building and paper?
Bamboo.
Q10. What does NCERT’s Chapter 6 call the cells that roll a grass leaf inwards when water is short?
Bulliform cells (NCERT Chapter 6, page 77).