Classification of Weeds

Question 1

These weeds are well-adapted to
well-drained soils.

Answer 1

Terrestrial/Upland

Question 2

Weeds that thrive best under saturated or flooded conditions of soil.

Answer 2

Lowland/Aquatic

Question 3

These are aquatic weeds that are not anchored on the soil.

Answer 3

Floating weeds

Question 4

Example of a floating aquatic weed.

Answer 4

Eichhornia crassipes

Question 5

Example of an emergent aquatic weed.

Answer 5

Monochoria vaginalis

Question 6

These weeds grow vertically with a single or multiple stem.

Answer 6

Erect

Question 7

These weeds grow horizontally om the ground.

Answer 7

Creeping/prostate

Question 8

These plants need support to grow vertically.

Answer 8

Twining/vining

Question 9

Stems are soft and succulent. Common in annuals.

Answer 9

Herbaceous

Question 10

Stems are hard with a bark; usually perennials.

Answer 10

Woody

Question 11

Stems are hard with a bark; usually perennials.

Answer 11

Woody

Question 12

Weeds that originate from a particular place, introduced to another area, adapt to a new place and in time become a serious weed.

Answer 12

Exotic/Imported

Question 13

Belong to the family graminaceae (formerly poaceae)

Answer 13

Grasses

Question 14

They belong to the family Cyperaceae. They have angular or triangular stems.

Answer 14

Sedges

Question 15

These weeds belong to other families in monocots and dicots. They are known for their broad and netted leaves, and are often woody.

Answer 15

Broadleaves

Question 16

It is a weed that reproduces by means of seed propagule.

Answer 16

Sexual weed

Question 17

It is a weed that reproduces by means of seed propagules.

Answer 17

Sexual weed

Question 18

It is a weed capable of reproducing by means of vegetative propagules.

Answer 18

Asexual weed

Question 19

It is a modified underground stem with buds and scales.

Answer 19

Rhizome

Question 20

It is a modified surface stem that creeps and roots at the side.

Answer 20

Stolon

Question 21

It is a short, thickened underground stem.

Answer 21

Tuber

Question 22

It is a baby plant that arises from the Mother Plant.

Answer 22

Off-shoot

Question 23

It is an inflorescence int he axis with at least primary and secondary branching.

Answer 23

Panicle

Question 24

It is more of less a conical inflorescence with flowers arising laterally from a common axis.

Answer 24

Raceme

Question 25

It is a compound structure whose members arise from the same point, like the fingers of a hand.

Answer 25

Digitate

Question 26

It is an infloresence in which a number of divergent flowers arise from the same point.

Answer 26

Umbel

Question 27

It is the struggle between two or more plants for a limited resource environment

Answer 27

Competition

Question 28

Competition of plants among the same species

Answer 28

Intraspecific Competition

Question 29

It is a competition of plants belonging to different species.

Answer 29

Interspecific Competition

Question 30

It refers to the weed density beyond which significant reductions will be incurred by the crop. It is the maximum weed population the crop can tolerate.

Answer 30

Critical Threshold Level

Question 31

It is the duration within the lifespan of a crop when it is most affected by weeds.

Answer 31

Critical Period of Competition