Which one of these is essential to perform Winnowing:A. Air B. Water C. Soil D. Rain
Air is essential to perform winnowing.
Winnowing is a farming method developed by ancient people for separating grain from the chaff.
It involves throwing the mixture into the air so that the wind blows away the lighter chaff. The heavier grains fall back down for recovery.
- Related Articles
- Clouds are(a) tiny drops of water floating in air(b) mixture of dust and water vapour(c) particles of water vapour(d) rain drops in air.
- Transpiration is a process in which plants(a) receive water from soil(b) absorb water vapour from air(c) prepare food from water(d) release water vapour.
- Which of the following is not a component of the abiotic environment?(A) Soil (B) Mountains (C) Plants (D) Air
- Which of the following is not a natural resource?(a) soil (b) water (c) electricity (d) natural gas
- Study the following statements about ozone:(a) It is essential for breathing of living organisms.(b) It is used to disinfect water.(c) It absorbs ultraviolet rays.(d) Its proportion in air is about 3%.Which of these statements are correct?(a), (b) and (c)(b) and (c)(a) and (d)All four
- Identify the solutions among the following mixtures.(a) Soil (b) Seawater(c) Air (d) Coal(e) Soda water.
- Which one term in the following includes the others?air, flora, fauna, environment, water, sunlight, soil
- Viruses, which cause hepatitis, are transmitted through(a) air(b) water(c) food(d) personal contact
- Cell wall of which one of these is not made up of cellulose?(a) Bacteria(b) Hydrilla(c) Mango tree(d) Cactus.
- Which of the following statements are “true”?(a) Water vapour is present in air only during the monsoon.(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.(c) The process of water changing into its vapour is called evaporation.(d) The evaporation of water takes place only in sunlight.(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
- Which of the following statements is incorrect?(a) All living things require air to breathe.(b) We can feel air but we cannot see it.(c) Moving air makes it possible to fly a kite.(d) Air is present everywhere but not in soil.
- What is Rain Water Harvesting?
- Which of the following is not a mixture?(a) kerosene (b) air(c) alcohol (d) petrol
- The most rapidly dwindling natural resource in the world is:(a) water (b) soil (c) sunlight (d) forests
- The refractive index of water with respect to air is $\frac {4}{3}$. The refractive index of air with respect to water will be:(a) 1.75 (b) 0.50 (c) 0.75 (d) 0.25
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies