Give examples of 3 plants that have-a) Spiny fruits b) Spiny stem c) Red flower d) Yellow flowers e) Leaves which close at night f) Fruits have a single seed g) Fruits have many seeds.

Sure, here are examples for each category:

a) Plants with spiny fruits:

Blackberry (Rubus fruticosus) - has aggregate fruits that are typically spiny.
Chestnut (Castanea spp.) - produces spiny husks around its nuts.
Bull thistle (Cirsium vulgare) - has spiny fruits called achenes.
b) Plants with spiny stems:

Thistle (Cirsium spp.) - known for its prickly stems.
Barberry (Berberis spp.) - some species have spiny stems.
Bougainvillea (Bougainvillea spp.) - a climbing plant with thorny stems.
c) Plants with red flowers:

Red Rose (Rosa spp.) - classic example of a red-flowered plant.
Poinsettia (Euphorbia pulcherrima) - famous for its red bracts.
Scarlet Beebalm (Monarda didyma) - a North American wildflower with red tubular flowers.
d) Plants with yellow flowers:

Sunflower (Helianthus annuus) - known for its large yellow flower heads.
Daffodil (Narcissus spp.) - has yellow trumpet-shaped flowers.
Goldenrod (Solidago spp.) - produces clusters of small yellow flowers.
e) Plants with leaves that close at night (nyctinastic movement):

Sensitive Plant (Mimosa pudica) - folds its leaves when touched or at night.
Oxalis (Oxalis spp.) - many species of Oxalis exhibit leaf movements.
Clover (Trifolium spp.) - some clover species show leaf movements in response to touch or light changes.
f) Plants with fruits that have a single seed:

Peach (Prunus persica) - typically has a single large seed.
Avocado (Persea americana) - has a large seed surrounded by fruit.
Coffee (Coffea spp.) - each coffee "bean" is actually a seed.
g) Plants with fruits that have many seeds:

Apple (Malus domestica) - contains numerous seeds in its core.
Tomato (Solanum lycopersicum) - has many seeds inside its fleshy fruit.
Watermelon (Citrullus lanatus) - large fruit with many seeds embedded in the flesh.