STD 7 Science Chapter 4

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  • 1/16 Questions

    Which of the following in insectivorous?

    • Mushroom
    • Cuscuta
    • Nepenthes
    • Option 4
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About This Quiz

This quiz for Std 7 science chapter 4 covers key topics in plant physiology, including insectivorous plants, stomata functions, nutrients, heterotrophs, photosynthesis, and the role of leaves in food production.

STD 7 Science Chapter 4 - Quiz

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  • 2. 

    Which parts of the leaf control the rate of loss water to the air?

    • Midrib

    • Stomata

    • Vascular bundle

    • Option 4

    Correct Answer
    A. Stomata
    Explanation
    Stomata are small openings on the surface of leaves that regulate the exchange of gases and the loss of water through transpiration. They control the rate of water loss by opening and closing their pores, allowing water vapor to escape when open and minimizing water loss when closed. The other options listed, such as the midrib and vascular bundle, are not directly involved in controlling the rate of water loss from the leaf.

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  • 3. 

    Which of the following is a nutrient?

    • Protein

    • Vitamins

    • All of these

    • Option 4

    Correct Answer
    A. All of these
    Explanation
    All of these options are considered nutrients. Proteins are essential macronutrients that are required for growth and repair of body tissues. Vitamins are micronutrients that are necessary for various metabolic processes in the body. Therefore, all of these options are correct as they are all nutrients.

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  • 4. 

    Human being can be categorised as

    • Heterotrophs

    • Autotrophs

    • Parasites

    • Option 4

    Correct Answer
    A. Heterotrophs
    Explanation
    Human beings are categorized as heterotrophs because they obtain their energy and nutrients by consuming other organisms. Unlike autotrophs, which can produce their own food through processes like photosynthesis, human beings rely on consuming plants or other animals for sustenance. Parasites, on the other hand, are organisms that live in or on another organism (the host) and rely on the host for their nourishment. Therefore, the correct categorization for human beings is heterotrophs.

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  • 5. 

    The food making process in plant is called as----

    • Glycolysis

    • Chemosynthesis

    • Photosynthesis

    • Option 4

    Correct Answer
    A. Photosynthesis
    Explanation
    Photosynthesis is the correct answer because it is the process by which plants convert sunlight, carbon dioxide, and water into glucose (food) and oxygen. During this process, plants use chlorophyll, a pigment found in their cells, to capture sunlight energy and convert it into chemical energy. This chemical energy is then used to produce glucose, which serves as the plant's food source. Therefore, photosynthesis is the food-making process in plants. Glycolysis is a metabolic pathway that occurs in the cytoplasm of cells and breaks down glucose to produce energy. Chemosynthesis is a process by which certain bacteria and archaea convert inorganic compounds into organic compounds without using sunlight.

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  • 6. 

    Which parts of the plant is called it's food factory

    • Fruits

    • Leaves

    • Flowers

    • Option 4

    Correct Answer
    A. Leaves
    Explanation
    Leaves are called the food factory of a plant because they contain chloroplasts, which are responsible for photosynthesis. During photosynthesis, leaves use sunlight, water, and carbon dioxide to produce glucose (a form of sugar) and oxygen. Glucose is the primary source of energy for the plant, and it is transported to other parts of the plant for growth and development. Therefore, leaves play a crucial role in producing food for the plant.

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  • 7. 

    Green pigment present in the leaves is called----

    • Hemoglobin 

    • Globulin

    • Chlorophyll

    • Option 4

    Correct Answer
    A. Chlorophyll
    Explanation
    Chlorophyll is the correct answer because it is the green pigment present in the leaves. It is responsible for capturing light energy and converting it into chemical energy through the process of photosynthesis. Chlorophyll gives leaves their green color and plays a crucial role in the plant's ability to produce glucose and oxygen. Hemoglobin and globulin are not green pigments and are not found in leaves.

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  • 8. 

    The raw materials for photosynthesis are

    • CO2

    • O2 water

    • N2 water

    • Option 4

    Correct Answer
    A. CO2
    Explanation
    The raw materials for photosynthesis are carbon dioxide (CO2) and water (H2O). During photosynthesis, plants use sunlight energy to convert CO2 and H2O into glucose and oxygen (O2). The glucose is then used as a source of energy for the plant, while the oxygen is released into the atmosphere. Therefore, the correct answer is CO2, as it is one of the essential raw materials for photosynthesis.

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  • 9. 

    Which one of the following is a parasite

    • Lichen

    • Cuscuta

    • Rhizobium

    • Option 4

    Correct Answer
    A. Cuscuta
    Explanation
    Cuscuta is a parasite because it is a genus of plants that lack chlorophyll and cannot produce their own food through photosynthesis. Instead, they attach themselves to other plants and obtain nutrients from them, effectively parasitizing the host plant. This dependency on a host plant for survival is a characteristic feature of parasitic organisms.

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  • 10. 

    ------does not have organs like hand and mouth

    • Amoeba

    • Frog

    • Cow

    • Option 4

    Correct Answer
    A. Amoeba
    Explanation
    Amoeba is a single-celled organism that belongs to the group of protists. Unlike multicellular organisms like frogs and cows, amoebas do not have specialized organs like hands and mouths. Instead, they have a flexible cell membrane that allows them to engulf food particles and move by extending and retracting their pseudopods. This unique characteristic of amoebas sets them apart from other organisms and makes them the correct answer in this case.

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  • 11. 

    Leaves are the food factory. Of plant.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Leaves are indeed the food factory of a plant. Through a process called photosynthesis, leaves use sunlight, water, and carbon dioxide to produce glucose, which is the plant's source of energy. This glucose is then converted into other substances, such as starch, that can be stored and used as needed by the plant. Therefore, leaves play a crucial role in the plant's ability to produce its own food.

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  • 12. 

    Food is essential for all living organism

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Food is essential for all living organisms because it provides the necessary nutrients and energy required for growth, development, and maintenance of bodily functions. Without food, living organisms would not be able to survive or carry out their normal physiological processes. Food provides essential macronutrients such as carbohydrates, proteins, and fats, as well as micronutrients like vitamins and minerals, which are all crucial for the proper functioning of the body. Therefore, it is true that food is essential for all living organisms.

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  • 13. 

    Water come into leaves through stomata in the form of vapour

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Water does not enter leaves in the form of vapor through stomata. Stomata are small openings on the surface of leaves that allow for gas exchange, including the release of water vapor through a process called transpiration. However, water is primarily absorbed by the roots of plants and transported through the xylem tissue to the leaves, where it is used for various metabolic processes and transpiration occurs. Therefore, the given statement is false.

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  • 14. 

    Algae are saprotrophs

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Algae are not saprotrophs. Saprotrophs are organisms that obtain nutrients by decomposing dead organic matter. Algae, on the other hand, are autotrophic organisms that can produce their own food through photosynthesis. They use sunlight, water, and carbon dioxide to synthesize organic compounds. Therefore, the statement "Algae are saprotrophs" is false.

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  • 15. 

    Cuscuta is a parasite

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Cuscuta is not a parasite. It is actually a genus of plants that are commonly known as dodder. While dodder plants are parasitic, not all plants in the Cuscuta genus are parasitic. Some species of Cuscuta are actually non-parasitic and can photosynthesize to obtain their own nutrients. Therefore, the statement "Cuscuta is a parasite" is false.

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  • Current Version
  • Nov 07, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 03, 2020
    Quiz Created by
    Kalpesh Patil

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