Cereal crops are herbs belonging to family Poaceae.
Lotus is an aquatic herb
Wheat (the plant) is, as Cycling-rod says, a cereal grain, which is a type of grass grown for its "fruit". It's definitely not a shrub (a small to medium sized woody plant). It's also not an herb in the culinary sense (a plant grown for its aromatic or savory leaves or flowers), though it is a "herbaceous plant" in the botanical sense (a plant with no persistent woody stem above ground).
It is a herb.
herb
Delonix regia
Neither. Barley is a grass that is used as a cereal crop.
Lotus is an aquatic herb
Wheat (the plant) is, as Cycling-rod says, a cereal grain, which is a type of grass grown for its "fruit". It's definitely not a shrub (a small to medium sized woody plant). It's also not an herb in the culinary sense (a plant grown for its aromatic or savory leaves or flowers), though it is a "herbaceous plant" in the botanical sense (a plant with no persistent woody stem above ground).
It is a herb.
herb shrub
Jute plant is a herb
herb
shrub
Shrub
Delonix regia
Lemon is neither an herb nor a shrub. It is a tree.
herb