« previous next »

Author Question: The development of new varieties of grain crops increased productivity by increasing the A) ... (Read 52 times)

bobthebuilder

  • Hero Member
  • *****
  • Posts: 567
on: Jul 16, 2018
The development of new varieties of grain crops increased productivity by increasing the
 
  A) surface area of the leaves of the plants.
  B) size of the roots and ability to absorb water.
  C) strength of the stems to support more grains.
  D) size and number of seeds.

Question 2

The future worldwide use of irrigation
 
  A) is expected to double in the next 20 years due to increasing demands for food.
  B) is limited by the availability of freshwater, waterlogging, and salinization of soils.
  C) depends on new technologies to extract more groundwater.
  D) will require increased reliance on new hydrogen technologies to produce freshwater.


kxciann

  • Sr. Member
  • ****
  • Posts: 356
Reply #1 on: Jul 16, 2018
Answer to Question 1

D

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

Did you know?

Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Did you know?

Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

Gross and fine motor development Gross and fine motor development
In middle childhood, children spend increasing amounts of time with peers and friends. In middle childhood, children spend increasing amounts of time with peers and friends.
Embryo and fetal development during weeks 1–25 of gestation. Embryo and fetal development during weeks 1–25 of gestation.
Development of the skull Development of the skull
Differences in yield between two wheat varieties at different soil fertility levels Differences in yield between two wheat varieties at different soil fertility levels
Steps in the development of colorectal cancers Steps in the development of colorectal cancers
Video: Polysaccharides

For a complete list of videos, visit our video library