Plants and animals develop adaptations to constraints of their environment, such
ID: 52113 • Letter: P
Question
Plants and animals develop adaptations to constraints of their environment, such as temperature, light availability, water availability oxygen availability, and food availability. Which of the following is true? O A. Ethylene production forming aerenchyma in plant roots and horizontal rooting are adaptations to low soil nutrient concentrations B. Plants and animals in aquatic environments are less protected from changes in temperature. O C. Ectotherms must constantly eat to maintain stable, constant body temperatures and metabolic activities D. Aquatic animals that obtain oxygen from the atmosphere are less stressed by low dissolved oxygen conditions than animals that breathe directly from the water 0 E. Halophytic plants dilute high solute concentrations characteristic of coastal marine environments by utilizing stored water OE. Halophytic plants dilute high solute concentrations characteristic of coastal marine environments by utilizing stored waterExplanation / Answer
1.
Ethylene production forming aerenchyma in plant roots and horizontal rooting are adaptations to low soil nutrient concentrations is true. Ethylene is a stress hormone produced under drought and nutrient deficiency conditions. Since, ethylene mediates the tolerance to potassium deprivation and found to induce root cortical aerenchyma signalling was observed under low potassium availability conditions in Arabdopsis plants by recent research studies. Hence, option a is correct.
2.
When air passes from low to higher elevation it expands and cools down and cannot hold the moisture and precipitates as rain. When the air crosses the peak of mountains the precipitation is over and air gets warm and becomes dry resulting in rain shadow effect. Thus, options C and D are correct.