S.
D. INTERNATIONAL SCHOOL
SUMMER
HOLIDAYS HOMEWORK
GRADE
-7 Science
1. The assignment is to be documented
in the science notebook
2.
Chapters
1, 2, and 3 require careful revision to grasp the key concepts.
3.
Assignment chapter 2 “ Nutrition in animals”
Q 1: Rohan observed that his pet cow
was chewing continuously even when it was not eating. Why do cows do that? What
does this indicate about their digestive system?
Q 2: If the salivary glands stop
functioning, how will it affect the digestion of food? Explain with reasons.
Q 3: A student examined a sample of
food under a microscope and saw amoebas surrounding it with pseudopodia. What
process was being observed? What does it tell us about the nutrition in amoeba?
Q 4: How is the process of digestion
in a ruminant animal different from that in humans? Mention any two
differences.
Q 5: Amit complains of indigestion
and stomach pain after eating very quickly. What habits should he change, and
why?
Q 6: Draw the diagram of the human digestive system. Label the
following parts:
Mouth Stomach Small intestine Large intestine
Also mention the function of any one of these parts.
Q 7: Why should we not lie down
immediately after eating a heavy meal? Relate your answer to the process of
digestion.
Q8: Why does food take longer to
digest in the stomach than in the mouth? What advantages does this provide to
the body?
Q9: Explain how the nutrients absorbed
in the small intestine reach different parts of the body. Which system is
involved apart from the digestive system?
High Order Thinking Skill Assignment :
Chapter 1 Nutrition in
Plants –
1. Imagine
a plant placed in a sealed transparent container with ample sunlight but no
carbon dioxide. Predict and explain what will happen to the plant over a week.
- If
you were a Rhizobium bacterium living in the root nodules of a leguminous
plant, describe your daily activities and how you benefit the plant.
- Propose
an experiment to demonstrate that chlorophyll is essential for photosynthesis.
What controls would you include?
- Compare
and contrast the modes of nutrition in a pitcher plant and a mushroom. How
do their nutritional strategies adapt them to their environments?
- Why
are farmers advised to grow leguminous crops in rotation with other crops?
Discuss the underlying biological processes involved.
- Imagine
you're a detective investigating a case where a plant isn't thriving
despite adequate sunlight and water. What could be the possible reasons?
Consider factors like chlorophyll presence, carbon dioxide levels, and
nutrient availability.
- Suppose
scientists discover a new planet species on Mars that doesn't perform
photosynthesis but thrives in low-light conditions. How might this plant
obtain its nutrition? Propose a possible mode of nutrition and justify
your reasoning.
8. You're
transported back to a time before plants evolved chlorophyll. How did early
plant-like organisms obtain energy? Discuss the evolution of autotrophic
nutrition.
- Write
a diary entry from the perspective of a leaf detailing a day in the life
of photosynthesis, including interactions with sunlight, water, and carbon
dioxide.
- As
an agricultural scientist, design a soil composition that would maximize
plant growth without synthetic fertilizers. What natural components would
you include, and why
Chapter 2 :Nutrition
in Animals
1. Trace
the journey of a morsel of bread through the human digestive system,
highlighting the role of enzymes at each stage.
- Describe
the process of nutrition in an amoeba from the organism's point of view.
How does it locate and digest its food?
- Explain
why cows chew cud. What advantages does this behavior provide in terms of
digestion and nutrient absorption?
- Design
an activity to show the effect of saliva on starch. What observations
would confirm the action of salivary amylase?
- Conduct
an experiment to map the taste regions of the human tongue. How would you
test for sweet, salty, sour, and bitter tastes?
Or
Create a map of the human tongue
indicating the regions most sensitive to different tastes. How does this
distribution aid in nutrition and survival?
- If
you were to design a digestive system for a new species that consumes both
plants and animals, what features would it have? Explain the reasoning
behind the length of the intestine, types of teeth, and enzymes present.
- Narrate
a short story from the perspective of an amoeba hunting for food,
capturing it, and digesting it. Highlight the processes involved in its
nutrition.
- Imagine
you're a cow explaining to a non-ruminant friend why you chew cud.
Describe the benefits of this process in your own words.
- Design
an experiment to test the effect of temperature on the activity of
salivary amylase. What results would you expect, and why?
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