CRP001 (WEED SCIENCE)

Question 1

A body of knowledge that primarily focuses on the study of weeds and their control. It is also defined as an integrative, applied scientific discipline typical of most other pest management and production-oriented disciplines of modern agriculture.

Answer 1

Weed Science

Question 2

Main Goal of Weed Science

Answer 2

the formulation of the most effective, economical, and satisfactory methods of controlling weeds.

Question 3

• a plant out of place and not intentionally sown
• a plant growing where it is not wanted
• a plant whose virtues have not yet been discovered
• a plant that is competitive, persistent, pernicious, and interfere negatively with human
  activity

Answer 3

Weed

Question 4

weeds were not recognized as pests because of the following reasons:

Answer 4

• their damage is not as visible as those by insects and diseases
• seldom results to total crop failure
• crops and weeds are always associated together

Question 5

familiarize all of the characteristics of weeds.

Answer 5

• Weeds exhibit fast seedling growth and early reproductive ability.
• They mature quickly or spend a short time in the vegetative stage.
• Weeds are adaptable and can thrive in various environmental conditions due to their high environmental plasticity.
• Weed seeds have various strategies to delay germination and ensure survival in favorable conditions.
• Weeds produce seeds similar in size and shape to crop seeds, making them hard to separate and easy to disperse by humans.
• Each weed generation can produce abundant seeds under diverse environmental conditions.
• Weeds possess strong competitive abilities for nutrients, light, and water, employing special tactics such as rosette formation, climbing, and allelopathy.

Question 6

GIVE THE GENERAL CLASSIFICATIONS OF WEEDS

Answer 6

a. Noxious Weeds
b. Common Weeds

Question 7

General classification of weeds where plants having undesirable characteristics that can resist control
practices.

Answer 7

Noxious Weeds

Question 8

Bermuda Grass Scientific name

Answer 8

Cynodon dactylon

Question 9

Indian Nightshade scientific name

Answer 9

Solanum ferox

Question 10

Purple Nutsedge scientific name

Answer 10

Cyperus rotundus

Question 11

General classification of weeds that can be found in every farm but are not injurious and can be readily controlled by good farming practices.

Answer 11

Common weeds

Question 12

False Daisy scientific name

Answer 12

Eclipta prostrata

Question 13

Jute scientific name

Answer 13

Corchorus aestuans

Question 14

Shameplant scientific name

Answer 14

Mimosa pudica

Question 15

Common Purslane scientific name

Answer 15

Portulaca oleracea

Question 16

Wire Grass scientific name

Answer 16

Eleusine indica

Question 17

SPECIFIC CLASSIFICATIONS OF WEEDS

Answer 17

a. Based on morphology
b. Based on Life Cycle
c.

Question 18

• under the Family Poaceae
• range from small, twisted,
  erect, or creeping annuals
  and perennials.
• stems are called culms with
  well-defined nodes and
  internodes

Answer 18

Grasses

Question 19

• under the Family Cyperaceae
• the easiest way to differentiate sedge from grasses is by looking at its stem
• sedge stems are solid and do
  not have nodes
• sedge stems are triangular in
  cross-section, three sided, especially towards the base of the stem
• In general, they are tough and wiry
• Many species have long,
  thin-textured, narrow, flat leaves which are usually arranged in threes.

Answer 19

Sedges

Question 20

• under the Family Dicotyledonae and Monocotyledonae
• characterized by shorter but wider leaves with either parallel or netted venation

Answer 20

Broadleaves