BOT3015 EXAM 2 Marking Scheme
What do all leaves originate as? - Answer-Primordia in the buds
/.At maturity most leaves consist of - Answer-A stalk called the petiole and a flattened
blade (lamina)
/.A blade (lamina) consists of - Answer-network of veins called vascular bundle
/.What are stipules? - Answer-A pair of leaf-like or thorn-like appendages are
sometimes present at the base of the petiole
/.What are sessile leaves? - Answer-leaves that lack petioles
/.What are deciduous plants? - Answer-leaves or trees that live through one growing
season
/.What are leaves of flowering plants associated with - Answer-leaf gaps and they all
have an axillary bud at the base
/.What is a simple leaf? - Answer-a leaf with only one blade
/.What is a compound leaf? - Answer-blade consists of multiple leaflets, still has a single
axillary bud at it's base with the leaflets having no such buds
/.pinnately compound leaf - Answer-leaf type with a divided leaf blade consisting of
leaflets arranged on both sides of the midrib
(rachis)
Sometimes the leaflets of a pinnately compound leaf may be subdivided into smaller
leaflets, forming a bipinnately compound leaf
/.palmately compound leaf - Answer-leaf type with leaflets that emerge from a point,
resembling the palm of a hand
/.Epidermis - Answer-single layer of cells covering the entire surface of
upper epidermis can be distinguished from lower epidermis by lack of stomata
/.Photosynthesis - Answer-involves trapping and ultimate storing of energy in sugar
molecules that are constructed from ordinary water and from carbon dioxide present in
the atmosphere
, /.Stomata - Answer-the small openings on the undersides of most leaves through which
oxygen and carbon dioxide can move
water vapor evaporating from the moist interior cell surfaces can also escape via the
stomata, resulting evap can cool leaf but excess water loss can damage plant
/.Stomatal apparatus - Answer-2 guard cells + stoma (opening), controls the water loss
when the guard cells inflate or deflate, opening or closing the pore
/.Transpiration - Answer-loss of water in vapor form, most transpiration takes place
through the stomata
/.Root Pressure - Answer-pressure exerted in the roots of plants as the result of
osmosis, causing exudation from cut stems and guttation of water from leaves
forces liquid water out of hydathodes at the tips of leaf veins, usually at night when
transpiration is not occurring
/.Guttation - Answer-loss of water through hydathodes due to root pressure
/.Leaves are attached to stems at regions called _________ - Answer-Nodes
/.Stem regions between nodes being known as ____________ - Answer-Internodes
/.Phyllotaxy - Answer-arrangement of leaves on a stem
/.Leaves are attached alternately or in a spiral along stem with one leaf per node in what
is called __________ arrangement - Answer-Alternate
/.In some plants two leaves may be attached at each node providing an ____________
arrangement - Answer-Opposite
/.When three or more leaves occur at a node they are said to be
___________________ - Answer-Whorled
/.Arrangement of veins in a leaf or leaf blade may be - Answer-pinnate or palmate
/.pinnately veined leaves - Answer-main midvein included within enlarged midrib;
secondary veins branch from midvein
/.palmately veined leaves - Answer-several primary veins fan out from base of blade
/.Primary veins - Answer-more or less parallel to one another in monocots
diverge from one another in various ways in dicots
What do all leaves originate as? - Answer-Primordia in the buds
/.At maturity most leaves consist of - Answer-A stalk called the petiole and a flattened
blade (lamina)
/.A blade (lamina) consists of - Answer-network of veins called vascular bundle
/.What are stipules? - Answer-A pair of leaf-like or thorn-like appendages are
sometimes present at the base of the petiole
/.What are sessile leaves? - Answer-leaves that lack petioles
/.What are deciduous plants? - Answer-leaves or trees that live through one growing
season
/.What are leaves of flowering plants associated with - Answer-leaf gaps and they all
have an axillary bud at the base
/.What is a simple leaf? - Answer-a leaf with only one blade
/.What is a compound leaf? - Answer-blade consists of multiple leaflets, still has a single
axillary bud at it's base with the leaflets having no such buds
/.pinnately compound leaf - Answer-leaf type with a divided leaf blade consisting of
leaflets arranged on both sides of the midrib
(rachis)
Sometimes the leaflets of a pinnately compound leaf may be subdivided into smaller
leaflets, forming a bipinnately compound leaf
/.palmately compound leaf - Answer-leaf type with leaflets that emerge from a point,
resembling the palm of a hand
/.Epidermis - Answer-single layer of cells covering the entire surface of
upper epidermis can be distinguished from lower epidermis by lack of stomata
/.Photosynthesis - Answer-involves trapping and ultimate storing of energy in sugar
molecules that are constructed from ordinary water and from carbon dioxide present in
the atmosphere
, /.Stomata - Answer-the small openings on the undersides of most leaves through which
oxygen and carbon dioxide can move
water vapor evaporating from the moist interior cell surfaces can also escape via the
stomata, resulting evap can cool leaf but excess water loss can damage plant
/.Stomatal apparatus - Answer-2 guard cells + stoma (opening), controls the water loss
when the guard cells inflate or deflate, opening or closing the pore
/.Transpiration - Answer-loss of water in vapor form, most transpiration takes place
through the stomata
/.Root Pressure - Answer-pressure exerted in the roots of plants as the result of
osmosis, causing exudation from cut stems and guttation of water from leaves
forces liquid water out of hydathodes at the tips of leaf veins, usually at night when
transpiration is not occurring
/.Guttation - Answer-loss of water through hydathodes due to root pressure
/.Leaves are attached to stems at regions called _________ - Answer-Nodes
/.Stem regions between nodes being known as ____________ - Answer-Internodes
/.Phyllotaxy - Answer-arrangement of leaves on a stem
/.Leaves are attached alternately or in a spiral along stem with one leaf per node in what
is called __________ arrangement - Answer-Alternate
/.In some plants two leaves may be attached at each node providing an ____________
arrangement - Answer-Opposite
/.When three or more leaves occur at a node they are said to be
___________________ - Answer-Whorled
/.Arrangement of veins in a leaf or leaf blade may be - Answer-pinnate or palmate
/.pinnately veined leaves - Answer-main midvein included within enlarged midrib;
secondary veins branch from midvein
/.palmately veined leaves - Answer-several primary veins fan out from base of blade
/.Primary veins - Answer-more or less parallel to one another in monocots
diverge from one another in various ways in dicots
