FBISE, NCP & NBF-aligned resources for Classes 9–12
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Biology Chapter 4 : Test Yourself
1 / 15
In a leaf cross-section, region A is the vascular bundle, B is the lower epidermis, C is the spongy mesophyll, and D is the upper epidermis. Which region contains cells responsible for water transport?
Reasoning: Region A points to a vascular bundle (specifically the xylem tissue within it). Xylem cells are hollow, tube-like structures responsible for transporting water and dissolved minerals from the roots up to the leaves.
2 / 15
Which row correctly matches cells with absorption, support, and transport functions?
Reasoning: Root hair cells absorb water and minerals, xylem vessels provide support, and red blood cells transport oxygen in the body.
3 / 15
Which option correctly states the functions of xylem and phloem in green plants?
Reasoning: Xylem transports water and mineral salts from roots to other parts of the plant and also provides mechanical support. Phloem transports manufactured food (mainly sugars) from leaves to the rest of the plant. Therefore, option C correctly describes the functions of both tissues.
4 / 15
If the tissue level does not develop in biological organization, which next level will not form?
Reasoning: Biological organization follows the sequence: cell → tissue → organ → organ system → organism. Organs are formed by the combination of different tissues. Therefore, if tissues are not formed, the organ level cannot develop.
5 / 15
Four plant structures are labelled A—a plant cell, B—a plant tissue section, C—a single leaf, and D—a complete plant. Which one represents the organ level?
Reasoning: It represents the organ level because it shows a single, complete leaf. In plants, leaves, stems, and roots are distinct organs made up of different tissues working together.
6 / 15
Which of the following lists the levels of body organization from smallest to largest?
Reasoning: Biological organization progresses from cell → tissue → organ → organ system → organism, with each level built from the previous one.
7 / 15
Which statement about homeostasis is incorrect?
Reasoning: Homeostasis is maintained by several systems working together (e.g., nervous, endocrine, excretory systems), not by a single system.
8 / 15
Which of the following statements best describes homeostasis?
Reasoning: Homeostasis means maintaining stable internal conditions despite changes in the external environment.
9 / 15
Organisms have the ability to change and modify their internal conditions according to the environment through:
Reasoning: Osmoregulation, thermoregulation, and excretion are all mechanisms that help maintain homeostasis.
10 / 15
You can observe spongy mesophyll and xylem in the section of leaf. These are part of the same:
Reasoning: Spongy mesophyll and xylem are tissues, and both are found within the leaf, which is an organ.
11 / 15
A sample from an organism shows one neuron with a cell body, nucleus, dendrites, axon, and nerve endings. Which level of organization does it represent?
Reasoning: The diagram shows a single neuron (nerve cell), which represents the basic structural and functional unit of the nervous system.
12 / 15
Which structure is not an organ?
Reasoning: Xylem is a tissue responsible for transport of water and minerals, whereas artery, flower, and spinal cord are organs.
13 / 15
Which description of xylem is correct?
Reasoning: Xylem is a vascular tissue that transports water and mineral salts and also provides support.
14 / 15
Which structure is at a different level of organization from the other three?
Reasoning: A neuron is a cell, while kidney, liver, and lung are organs. Therefore, neuron belongs to a different level of biological organization.
15 / 15
In a leaf cross-section, 1 is upper epidermis, 2 palisade mesophyll, 3 vascular tissue, 4 lower epidermis, 5 spongy mesophyll, and 6 a stoma. Which labelled cells perform photosynthesis?
Reasoning: 2 points to the palisade mesophyll cells, which are packed with a large number of chloroplasts and are the primary site for photosynthesis in a leaf. 5 points to the spongy mesophyll cells, which also contain chloroplasts and perform photosynthesis, while their loose arrangement allows for gas exchange.
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