Week 3 - Leaves

Question 1

What is the edge of a leaf called?

Answer 1

Apex

Question 2

The stalk-like portion of the leaf is the?

Answer 2

Petiole

Question 3

What are composed of cells that serve in conduction of food and water and to
some degree, in support?

Answer 3

Veins

Question 4

Leaf venation in monocots is….and in dicots is…. .Some net veined leaves with lateral veins are called….and In other leaves, several strong veins enter the base of a leaf from the petiole and spread
through the blade like the fingers from the hand. These are termed ….

Answer 4

a) parallel ,net-like pattern, pinnately venated , palmately veined
b) net-like pattern, parallel,palmately veined , pinnately venated
c) pinnately venated, parallel venation, palmately veined, net-like pattern

Question 5

An outgrowth known to be on the inner (upper) surface of the leaf, found between the sheath and blade is called ?

Answer 5

Ligule

Question 6

The zone at the junction of sheath and blade on the outer (lower) surface is known
as the?

Answer 6

Collar

Question 7

The blades of compound leaves

are divided into leaflets, each usually with its own small petiole called the ?

Answer 7

petiolule

Question 8

The arrangement of leaves on the stem is called ?

Answer 8

Phyllotaxy

Question 9

• leaves one per node
• leaves two per node
• three or more leaves per nodes
• leaves not aligned with their nearest neighbours

a) Alternate, opposite, spiral, whorled
b) Opposite, spiral, alternate, whorled
c) spiral, alternate, whorled, spiral
d) whorled, opposite, spiral, alternate
e) Alternate, opposite, whorled, spiral

Answer 9

e) Alternate, opposite, whorled, spiral

Question 10

They grow indefinitely and contain cells capable of sensing

contact with another object, what are they ?

Answer 10

Tendrils (leaf tendrils)

Question 11

The leaves are thick and fleshy, a shape that reduces the

surface-to-volume ratio and favours water conservation., These are ?

Answer 11

Succulent leaves

Question 12

The term that refers to the expanded petiole of a leaf, often resembling a
more or less parallel-veined leaf in out-look?

Answer 12

Phyllodium or phyllode

Question 13

Function of phyllodium or phyllode?

Answer 13

Serve the function of a leave

Question 14

modified leaves by their position just below an axillary bud or shoot on the node, with projections from the margins of blades

Answer 14

Leaf spines

Question 15

Function of leaf spines

Answer 15

absorb and reflect excessive sunlight and spine tips act as places where dew may condense, drip to the
soil and provide moisture for the plants.

Reduce transpiration

Question 16

Insectivorous plants usually grow in habitats that are?

Answer 16

Poor in nitrates and ammonia

Question 17

Specialized leaves that capture and digest insects

Answer 17

Insectivorous plants (leaves)

Question 18

Trap leaves that move during capture are?

Answer 18

Active traps

Question 19

Trap leaves that are incapable of movement are ?

Answer 19

Passive traps

Question 20

Best known trap leaves are ?

Answer 20

Passive traps : Nepenthes sp. (Pitcher plants) and Sarrencia spp.

Active traps : leaves of Venus Flytrap (Dionaea muscipula)

Question 21

Function of bud scales

Answer 21

Protection for newly formed leaves and branch growth

Question 22

What is a bud scale?

Answer 22

one of the leaves resembling scales that form the sheath of a plant bud. ( Leaves convert into bud scales)

Question 23

What is the role of bud scales?

Answer 23

Protection and photosynthesis

Question 24

Description of bud scales

Answer 24

Waxier and tougher than normal leaves

Question 25

The rachis is an extension of the ?

Answer 25

Petiole of a compound leaf that bears leaflets

Question 26

How are leaflets arranged?

Answer 26

Always arranged in rows

Question 27

Prevention of tearing:

Answer 27

Making the leaf small, tough or compound.

Question 28

The term phyllodium refers to the ?

Answer 28

Extended leaf base

Has no lamina

Question 29

Leaves that are sessile lack?

Answer 29

A Petiole

Question 30

Leaf-like or scale-like structures found at the base of a petiole are?

Answer 30

Stipules