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

Related Mcqs:

1. The enzyme responsible for biological nitrogen fixation is________________?

   A. Lipase
   B. Nitrogenase
   C. Isomerase
   D. Kinease

2. Ratio of economic yield to biological yield expressed in percentage is called_______________?

   A. Harvest index
   B. Seed index
   C. Total yield
   D. Dry matter

3. Pulling of off- type plants from a cropped field is called___________________?

   A. Rouging
   B. Weeding
   C. Pruning
   D. None of the above

4. When crop plants adopt to a new environment are called___________________?

   A. Accaumatization
   B. Domestication
   C. Selection
   D. Introduction

5. When the course of water is blocked at some places if is called___________________?

   A. Lake
   B. Dam
   C. River
   D. Head works

6. Part of embryonic axis which develops into root is called___________________?

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

7. The harmful influence of one living plant on another living plant by the secretion of a toxic substance is called________________?

   A. Allergy
   B. Allelopathy
   C. Parasitism
   D. Antagorusm

8. Gaseous loss of a substance from the soil or from fertilizer or manure is called_________________?

   A. Volatilization
   B. Evaporation
   C. Transpiration
   D. Evapotranspiration

9. The substance that an enzyme acts upon is known as___________________?

   A. Product
   B. Substrate
   C. Mycotoxin
   D. None of the above

10. The negative logarithm of the hydrogen ion concentration, a measure of the acidity of a solution is called_______________?

    A. pH
    B. EC
    C. Cl
    D. Saliruiy