NOTE UNDERSTAND THE WORKSHEETS THROUGHLY AND THESE ATTEMPT THESE COMPETANCY BASED QUESTIONS
CHAPTER 8 CLASS IV REVISION TEST
Q1.Identify and explain
Look at the farming tools or machinery listed (you may provide images or names in your actual paper).
Identify each tool or machine.
Describe one practical use for each in farming.
Suggest one simple safety or efficiency tip when using any one of them.
Q2.Explain, connect, and evaluate
a) Explain what a weed is and what the practice of weeding involves.
b) Describe how the presence of weeds affects crop growth and yield.
c) Suggest one practical step a farmer or gardener can take to reduce weed impact, and briefly explain why it helps.
Q3.Explain, compare, and evaluate
a) Explain what manure is, how it is made, and how it is used in farming.
b) Compare manure with chemical fertilizers, noting at least one similarity and one difference in their use or effects.
c) Name two examples of chemical fertilizers.
Q4.Explain and infer
a) Discuss whether fertilizers and pesticides can be harmful to humans, and in what ways.
b) Explain what happens when fertilizers or pesticides are washed off by rain—where do they go, and what might be the effect?
c) Propose one measure to reduce such harmful runoff in a local farming or gardening context..
Q5.a) Investigate whether there are pesticides or pest‑control methods that are less harmful to humans. Provide one example or idea.
b) Explain a safe, traditional, or natural way to protect grains or crops from pests—for instance, using neem leaves or another locally available method.
c) Suggest one simple step to test or promote this method in your community or school, mentioning one expected benefit.
Revision test
Class IV
Chapter 9
Q1: What is the first step in the digestive process when food enters the mouth?
(a) It is mixed with digestive juices
(b) It is chewed and ground by teeth
(c) It travels down the food pipe
(d) It is absorbed into the bloodstream
Q2: What role does saliva play in digestion ?
(a) It breaks down proteins
(b) It helps to breakdown food into smaller particles
(c) It absorbs food into the bloodstream
(d) It moves food through the digestive path
Q3: What is the primary function of the small intestine in digestion?
(a) To grind anḍ crush food
(b) To absorb water from the food
(c) To breakdown food into tiny particles and absorb nutrients
(d) To store waste food
Q4: What is the substance in the mouth that helps breakdown starch?
(a) Saliva
(b) Bile
(c) Gastric juice
(d) Pancreatic Juice
Q5: What happens when food passes through the food pipe?
(a) It gets absorbed into the bloodstream
(b) It is churned broken down further
(c) it moves through by muscle contractions
(d) It is digested and absorbed by the stomach.
Q6: Which part of the digestive system is responsible for breaking down food into nutrients that can be absorbed by the body?
(a) Mouth
(b) Stomach
(c) Small Intestine
(d) Large Intestine
Q7: What happens after food is broken down in the small intestine?
(a) It is expelled through the anus .
(b) It is absorbed into the bloodstream.
(c) It moves to the large intestine for digestion
(d) It enters the stomach for further digestion.
Q8: Where is solid waste formed after digestion?
(a) Mouth
(b) Stomach
(c) Small Intestine
(d) Large Intestine
Q9: What does your body do with the food that is absorbed into the bloodstream?
(a) It is converted into waste
(b) It is used to produce energy and maintain growth.
(c) It is stored in the large intestine
(d) It is passed into the stomach for further breakdown
Q10: What does iodine solution do when applied to foods that contain starch?
(a) It turns the food green.
(b) It turns the food black or blue.
(c) It turns the food red.
(d) It makes the food transparent.
Q1.Imagine the stomach were a straight tube instead of its normal bag‑like, expandable shape.
Explain what practical problems or changes in digestion might result. How would this altered shape affect the stomach’s roles such as storing, mixing, or starting to break down food?
Q2.Describe the role of the small intestine in digestion and nutrient absorption.
Show how specific structural features—like its length, folds, or tiny projections—support efficient absorption of nutrients into the body.
Q3.Compare, contrast, and evaluate:
Compare the main functions of the stomach and the large intestine in the digestive process.
Contrast how each organ contributes differently to digestion and overall health.
Decide which of their functions is most critical for nutrition, and justify your choice briefly.
Q4 Compare systems and make a judgement:
Compare the digestive system of a human with that of an earthworm.
Identify at least two similarities and two differences.
Decide which system is more complex, and justify your choice based on number of parts, specialization, or processes involved.
Q5.Discuss how the food pipe (oesophagus) supports digestion—and what might happen if it does not work properly.
Describe its role in moving food toward the stomach.
Infer probable consequences on digestion or health if the food pipe couldn’t perform this role well.
Revision Test
Chapter 10
Class IV EVS PA 3
Q1. A school eco-club starts a compost pit in the campus. They add vegetable peels, dry leaves, and some earthworms to the pit. After a few weeks, the waste turns into dark, crumbly manure.
(a) Explain how earthworms help in converting garbage into manure.
(b) Predict what would happen if earthworms were not added to the compost pit.
(c) Suggest two benefits of using compost manure in the school garden.
Q2. In your locality, wastewater from houses is carried through underground pipes to a treatment facility before being released into a nearby river.
(a) Identify the different stages that may be involved in treating sewage.
(b) Examine how these treatment methods help in maintaining public health.
(c) Evaluate the environmental benefits of treating sewage before releasing it into water bodies.
Q3. A city plans to build a new Sewage Treatment Plant (STP) because untreated sewage was earlier being discharged into open drains.
(a) Describe the role of a sewage treatment plant in waste management.
(b) Analyze the possible dangers to humans and the environment if sewage is not treated properly.
(c) Suggest two long-term benefits of setting up an STP in the city.
Q4. In a village near a river, some people practice open defecation along the riverbank. After the rainy season, many villagers fall sick due to water-borne diseases.
(a) Explain how improper outdoor defecation affects the environment.
(b) Analyze how it impacts public health.
(c) Justify why defecating near water sources should be strictly avoided.
Q5. A student eats food without washing hands after cleaning a garbage bin and later suffers from stomach infection.
(a) Explain why it is important to wash hands after handling decomposing waste or using the toilet.
(b) Describe the role of microbes in spreading diseases.
(c) Suggest two hygienic practices that can prevent the spread of infections.
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