NEET BIOLOGY

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ECOLOGY

ORGANISMS AND THE ENVIRONMENT

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Weeds are plants that grow in areas where they are unwanted. Often they spread aggressively and damage garden plants by competing with them for sunlight, water, and nutrients. The growth of weeds is the first stage of ecological succession, which acts to-
A
restructure a habitat and allow only the most hardy plants to survive.
B
clear-cut a habitat and allow only the smallest plants to survive.‘
C
bring water to a habitat and allow only the most water-loving plants to survive.
D
drain water from a habitat and allow only the most fibrous plants to survive.
Explanation: 

Detailed explanation-1: -The 5 stages of succession are Nudation, Invasion, Competition and Co-action, Reaction, and Climax or Stabilization.

Detailed explanation-2: -The labels I-VII represent the different stages of primary succession. I-bare rocks, II-pioneers (mosses, lichen, algae, fungi), III-annual herbaceous plants, IV-perennial herbaceous plants and grasses, V-shrubs, VI-shade intolerant trees, VII-shade tolerant trees.

Detailed explanation-3: -Primary succession happens when a new patch of land is created or exposed for the first time. This can happen, for example, when lava cools and creates new rocks, or when a glacier retreats and exposes rocks without any soil. During primary succession, organisms must start from scratch.

Detailed explanation-4: -A classic example of secondary succession occurs in oak and hickory forests cleared by wildfire. Wildfires will burn most vegetation and kill animals unable to flee the area. Their nutrients, however, are returned to the ground in the form of ash.

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