Factors Affecting Vegetation

Mangroves are suited to saline marshy coastal areas. Exam tip: connect mangroves with coasts.

As altitude increases, temperature generally decreases, while rainfall, moisture and wind conditions also vary. Different plants grow under different climatic conditions; therefore, vegetation belts such as tropical, coniferous and alpine belts occur in the Himalayas. Option B is incorrect because rainfall varies with altitude and slope in mountainous regions. Exam tip: link altitudinal vegetation belts mainly with changing climate, especially temperature.

On sloping land, rainwater can flow rapidly and carry away fertile topsoil. A thinner soil layer provides less moisture and fewer nutrients, which can limit plant growth. Option C is incorrect because sunlight on a slope may vary with its aspect, but it is not generally absent. Exam tip: link steep slopes with soil erosion and reduced vegetation.

Deep soil is useful for roots and water holding. Exam tip: connect plains with fertile soil.

Good drainage allows excess water to move out of the soil and prevents waterlogging around the roots. In waterlogged soil, roots receive too little oxygen and may rot. Protection from excessive sunlight is provided by shade or cover, not by drainage. Exam tip: link drainage with air availability for roots and prevention of waterlogging.

Waterlogging can reduce air around roots. Exam tip: treat waterlogging as a harmful condition.

In seasonal rainfall trees may shed leaves in dry season. Exam tip: connect deciduous with dry season.

Evergreen forests occur in high rainfall humid climate. Exam tip: connect evergreen with year round greenery.

High altitude is colder so large trees are fewer. Exam tip: connect alpine with high mountains.

Moderate rainfall can be suitable for grasses. Exam tip: connect rainfall amount with vegetation type.

Deforestation involves clearing trees and natural vegetation, so it reduces forest cover. Option A states the opposite. Deforestation may cause soil erosion and affect the rainfall cycle, but it does not always make soil fertile or increase rainfall immediately. Exam tip: the most direct effect of deforestation is a decrease in vegetation and forest cover.

Afforestation is a positive measure of vegetation conservation. Exam tip: connect afforestation with green cover.

Overgrazing can weaken grasses and small plants. Exam tip: remember grazing and vegetation degradation.

Forest fire damages vegetation and animal shelter. Exam tip: remember the link between forests and wildlife.

To expand agriculture, forests and grasslands may be cleared and converted into fields. This destroys the natural vegetation growing there and reduces its area. Changes in sunlight or rainfall are not the direct reason natural vegetation declines during agricultural expansion. Exam tip: conversion of natural land into farmland is a major human cause of vegetation loss.

When cities expand construction can replace natural vegetation. Exam tip: connect urbanisation with vegetation loss.

Protected areas are places where human activities are regulated to conserve nature. They may include national parks, wildlife sanctuaries, and biosphere reserves. Their purpose is to protect plants, animals, habitats, and the ecological relationships that support biodiversity. They can also protect soil, water, and important natural landscapes, but their central conservation role concerns vegetation and wildlife. Therefore, option A is correct. Roads, markets, and buildings may exist near some protected areas, but protecting those structures is not the main purpose of creating such areas.

The reasoning is based on the meaning of “protected.” A protected area receives special management so that habitats are not destroyed by uncontrolled hunting, cutting, construction, or other harmful activities. This gives species a safer place to survive and reproduce and helps maintain ecological balance. The question asks what these areas help conserve, so the broad pair “vegetation and wildlife” is the appropriate choice. The supplied answer A is accurate and expresses the basic aim of conservation.

Warmth and moisture are favourable for plants. Exam tip: connect tropics with dense vegetation.

At low temperatures, plant processes such as photosynthesis and enzyme activity slow down. Cold regions also often have a short growing season, giving plants less time to grow. Option B is incorrect because low temperature generally reduces, rather than increases, root activity and water absorption. Exam tip: lower temperature can reduce both the rate and duration of plant growth.

Deep soil helps roots take water and nutrients. Exam tip: remember the soil depth and root relation.