AP PSYCHOLOGY

SOCIAL PSYCHOLOGY

GROUP BEHAVIOR

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which statement BEST explains why few plants grow on a tropical rainforest floor?
A
Heavy rains fall throughout the year.
B
Temperatures in a tropical rainforest stay warm.
C
Many different kinds of animals live on a rainforest floor.
D
Layers of trees keep sunlight from reaching the forest floor.
Explanation: 

Detailed explanation-1: -The forest floor is the lowest region. Since only two percent of the sunlight can filter through the top layers to the understory very few plants grow there. The forest floor, however, is rich with rotting vegetation and bodies of dead animals which quickly break down and get integrated into the soil as nutrients.

Detailed explanation-2: -Tropical Rainforest: Plants However, the canopy created by the tall trees (100-120 feet) and the understory, prevents sunlight from reaching the ground. The soil is, therefore, always shaded, and very little vegetation is able to survive at ground level.

Detailed explanation-3: -Typical plants that are found on the forest floor include a variety of ferns, mangrove trees, and vines. The canopy of trees spread their leaves to attract as much sunlight. Though the forest floor is the principal sites of decomposition, there is a stiff competition for sunlight and nutrients.

Detailed explanation-4: -The correct answer is 1 only. The tropical rainforest is a hot, moist biome found near Earth’s equator. The world’s largest tropical rainforests are in South America, Africa, and Southeast Asia. It receives from 60 to 160 inches of precipitation that is fairly evenly distributed throughout the year.

Detailed explanation-5: -This is because the leaves of the trees above are so dense that they block any sunlight from reaching the forest floor. As a result, it is dark and most plants do not receive enough light to perform photosynthesis, which is how plants make food out of water, carbon dioxide and sunlight.

There is 1 question to complete.