Biotic factors
Biotic Factors
Biotic factors: Biotic factors include living organisms such as rodents, birds, insects and microorganisms which damage stored food grains. Food also gets spoilt by the action of the enzymes present in them.
1. Some soil organisms like bacteria, fungi, earthworm, rodents and termite cause disease. Some aid the aeration of soil, percolation and fertility.Some open up wounds on plants or animals for other pathogen to enter, also reduce the quality and quantity of crop.
2. Some pests includes birds, insects, rodents and some mammals reduce the quality and yield of crops and animals which reduces the income of farmers.
Which of the following are correct : (a) Insects and nematodes cause damage to crop yield and considered as harmful organisms. (b) Some soil organisms like bacteria, fungi, earthworm, rodents and termite cause disease. (c) Some open up wounds on plants or animals for other pathogen to enter, also reduce the quality and quantity of crop. | |||
| Right Option : D | |||
| View Explanation | |||
_______________ reduce crop productivity by competing with the main crop for nutrients and light. | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct : (a) Weeds also reduce crop productivity by competing with the main crop for nutrients and light. (b) Continuous cultivation, bush burning and inability to control erosion can lead to lower crop agricultural output. | |||
| Right Option : C | |||
| View Explanation | |||
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