The transport of a substance across a biological membrane against a concentration gradient is called___________________?

A. A fruit is a product of flower
B. A fruit is a product of ovary
C. A fruit is a mature ovary that contain seed
D. A fruit is post-fertilization product of the pistil

A. Plumule
B. Radicle
C. Coleoptile
D. Coleorluza

A. HD grains
B. LD grains
C. All the above
D. non of these

A. High density grain
B. Low density grain
C. Both a & b
D. None of the above

A. Cropg pattern
B. Cropg intensity
C. Cost-benefit ratio
D. None of the above

A. Disease
B. Insect pest
C. Lodging
D. Viruses