This is somewhat more complicated than you might think.
There are several sugar polymers, most specifically cellulose, that contribute structural rigidity to plant structures. However in many grasses microscopic crystals of silicon dioxide (i.e. quartz) are embedded in these polymers like steel rebar is embedded in concrete to give extra strength and rigidity to the blades of grass. Such grasses can be identified because the edges of the grass blades have an abrasive "saw blade" like feeling when touched.
Turgor pressure is what allows a blade of grass to stand up straight. This is a type of a molecule.
polysaccharide
polysaccharide
Chlorophyll is the molecule in a blade of grass that captures solar energy during photosynthesis.
Cellulose, lignin, hemi-cellulose and fibres are all molecules in the structure of the plant cell wall that makes the plant (in this case a blade of grass) stand up straight. Polysaccharide
Cellulosecellulose
Cellulosecellulose
The dew drop can fall of the tree and land carefully on the grass
This question is unanswerable as it depends on which type of grass you mean.
a blade of grass weigh a gram? Not normal grass anyway, weigh much less
Cellulose is the molecule that provides structural support to plant cell walls, including those in blades of grass, enabling them to stand upright. Cellulose is a long-chain polysaccharide made up of repeating glucose units and forms strong, rigid structures through hydrogen bonding between adjacent cellulose chains.
Polysaccharide!!