Practice questions
Q1Imran says paddy and gram need the same watering. Which idea is missing?
A Same crop gives same yield
B Irrigation varies with crop, soil and season
C Storage decides seed depth
D Weeding replaces irrigation
Explanation Paddy needs standing water while gram needs far less; irrigation timing and amount vary with crop, soil and season, which is the idea Imran misses.
Q2Assertion: Healthy seeds should be sown at correct spacing and suitable depth. Reason: Correct spacing prevents overcrowding, and suitable depth helps the seed get proper soil conditions for germination.
A Both assertion and reason are true, and the reason correctly explains the assertion.
B Both assertion and reason are true, but the reason does not explain the assertion.
C The assertion is true, but the reason is false.
D The assertion is false, but the reason is true.
Explanation The assertion and the reason are both correct. In sowing, healthy seeds, proper spacing and suitable depth help avoid overcrowding and give seeds better conditions for germination.
Q3Devika tests seeds in water. What is the intended observation?
A All healthy seeds float
B Fertilisers dissolve into seeds
C Good seeds become weeds
D Damaged hollow seeds may float
Explanation The seed-selection float test works because damaged or hollow seeds float while sound, filled seeds sink, so the floating ones can be removed before sowing.
Q4Which statement about a balanced diet is incorrect?
A It should include food components needed for growth, energy and protection.
B It may include cereals, pulses, vegetables, fruits and milk according to availability.
C It means eating only one energy-rich food every day.
D Lack of required food components can lead to deficiency diseases.
Explanation A balanced diet gives the body different needed components, not just one energy-rich food. Variety matters because missing nutrients can cause deficiency diseases, while cereals, pulses, vegetables, fruits and milk can contribute different components.
Q5During irrigation, why are sprinkler and drip systems considered useful in crop production?
A They supply water more economically and help reduce wastage according to crop need.
B They make every crop need the same amount of water at the same interval.
C They remove weeds by cutting unwanted plants near the crop roots.
D They replace manure and fertiliser by adding nitrogen, phosphorus and potassium to soil.
Explanation Sprinkler and drip systems are useful because irrigation should match the crop, soil and season while using water economically. The other options confuse irrigation with fixed water needs for all crops, weeding, or nutrient supply through manure and fertilisers.
More questions
6Meena stores grain after harvest. Which action is safest?
ADry, clean and cover the grain before storage
BKeep damp grain open near a wall
CMix weeds into the grain sack
DWater the grain before closing it
7Which statement best describes manure in crop production?
ANatural decomposed plant or animal waste that adds humus and improves soil texture
BA factory-made chemical that gives only one fixed nutrient to every crop
CUnwanted plants removed from the field before harvesting
DWater supplied to crops at suitable intervals
8Assertion: Old Science Class 8 crop chapter should be marked historical. Reason: Current middle-stage science title is Curiosity.
ABoth true but reason unrelated
BAssertion true, reason false
CBoth true and reason explains assertion
DAssertion false, reason true
9Which option best explains why weeds must be removed?
AThey always become manure immediately
BThey are the same as seedlings
CThey increase every crop yield
DThey compete for water, nutrients, space and light
10Which option best describes a fertiliser in crop production?
AA factory-made nutrient-rich substance that supplies particular nutrients such as nitrogen, phosphorus or potassium
BNatural decomposed plant and animal waste that mainly adds humus and improves soil texture
CThe process of supplying water to crops at suitable intervals
DThe removal of unwanted plants that compete with the crop
11Which description best matches agriculture in middle-stage science?
AOrganised cultivation using land, seed, water, nutrients, tools, labour and time to produce crops.
BOnly selling harvested grains in a market after storage.
COnly collecting wild fruits and leaves from forests.
DOnly adding factory-made nutrients to soil before rain.
12A teacher asks why a farmer should not water paddy, gram and a cactus-like plant in exactly the same way. Which idea is being tested?
AAll crops need water only after harvesting
BIrrigation depends on crop, soil and season
COnly fertiliser decides how much water a crop needs
DSprinkler and drip systems are used only for storage
13Assertion: A farmer should not water every crop in the same way in every field and season. Reason: Irrigation depends on crop, soil and season.
ABoth the assertion and the reason are true, and the reason correctly explains the assertion.
BBoth the assertion and the reason are true, but the reason does not explain the assertion.
CThe assertion is true, but the reason is false.
DThe assertion is false, but the reason is true.
14Which source use is honest for a REET note on this topic?
ACall old Science Class 8 the current title
BUse RBSE for boundary and old NCERT as historical crop reference
CQuote the dossier paraphrase as verbatim RBSE
DIgnore current NCERT title verification
15Choose the correct order of these crop-production practices: sowing, harvesting, storage and preparation of soil.
ASowing, preparation of soil, harvesting, storage
BPreparation of soil, harvesting, sowing, storage
CStorage, preparation of soil, sowing, harvesting
DPreparation of soil, sowing, harvesting, storage
