Chapter 7, Problem 4STP

Summary Introduction

Introduction : Tundra is a region below the polar ice caps extending across North America, Europe and Siberia in Asia. The region is extremely cold and is treeless. The tundra is a biome with permanently frozen soil.

Answer to Problem 4STP

Correct answer :

The correct answer is option C. roots that grow only a few centimeters deep

Explanation of Solution

Explanation/justification for the correct answer:

Option C. roots that grow only a few centimeters deep

Tundra is a very cold region with temperatures going as low as -34⁰C. The soil below the surface is permanently frozen and is called permafrost. The ground thaws to a depth of few centimeters in the summer. Its constant cycle of freezing and thawing does not allow roots of trees to grow. Only shallow rooted plants like grasses and shrubs can grow.

Explanation for incorrect answer:

Option A. Deciduous leaves that fall off as winter approaches- This is a feature of trees in temperate forest. Hence, this is not a correct option.

Option B. Leaves that store water- Desert plants have leaves that store water as there is scarcity of water in a desert. Hence, this is an incorrect option.

Option D. Underground stems that are protected from grazing animals- This is characteristic of temperate grassland where soil is fertile and is covered with thick cover of grasses. Lot of animals graze and so there are underground stems which are not eaten by animals. Hence, this is an incorrect option.