Why does reverend sykes tell scout to stand up when her father passes? what does this gesture suggest about the feelings of the african-american community towards atticus finch?

Reverend Sykes tells Scout to stand up out of respect for her father and what he did. The gesture is a show of respect from the African-American community. He stood up for Tom Robinson, an innocent man, even though he is African-American. While many white people in the community know that Tom Robinson is innocent, they will not take the word of a black man over a white man. Atticus treats everyone with an equal amount of respect no matter their race.

Yes, just because one had a disability doesn't change the meaning of the word. they would most likely have an (whatever language) sign language to sign what's going on. it would be the same even if he was blind.

Walked would be the participle here. as it is a verb ending in -ed.