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Choose the most appropriate option to describe the role of biogeochemical cycles in an ecosystem. (i) To provide food directly to all organisms. (ii) To recycle essential nutrients between biotic and abiotic components. (iii) To create new elements for use by living things. (iv) To remove pollutants and toxins from the organism.
The correct option is (ii) To recycle essential nutrients between biotic and abiotic components. In any ecosystem, essential chemical nutrients are finite. Biogeochemical cycles drive the circular exchange of vital matter—such as water, carbon, nitrogen and oxygen—between living organisms (biotic) aRead more
The correct option is (ii) To recycle essential nutrients between biotic and abiotic components. In any ecosystem, essential chemical nutrients are finite. Biogeochemical cycles drive the circular exchange of vital matter—such as water, carbon, nitrogen and oxygen—between living organisms (biotic) and the physical environment of air, water and soil (abiotic), ensuring these essential resources remain perpetually available for life.
For more NCERT Solutions of Class 9 Science Exploration Chapter 13 Earth as a System: Energy, Matter and Life Question Answer (2026-27)
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See lessMeena and Hari observed an animal in their garden. Hari called it an insect while Meena said it was an earthworm. Choose the correct option which confirms that it is an insect. (i) Bilateral symmetrical body (ii) Body with jointed legs (iii) Cylindrical body (iv) Body with little segmentation
The correct option is (ii) Body with jointed legs. Insects belong to the phylum Arthropoda, whose defining structural feature is the presence of jointed appendages and legs attached to segmented body sections. While both earthworms and insects have bilateral symmetry and segmented bodies, an earthwoRead more
The correct option is (ii) Body with jointed legs. Insects belong to the phylum Arthropoda, whose defining structural feature is the presence of jointed appendages and legs attached to segmented body sections. While both earthworms and insects have bilateral symmetry and segmented bodies, an earthworm lacks legs entirely, making jointed appendages the definitive characteristic confirming it is an insect.
For more NCERT Solutions of Class 9 Science Exploration Chapter 12 Patterns in Life Diversity and Classification Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-12/
See lessSponges represent one of the simplest animal body plans. Their bodies lack true tissues and organs. Which feature of sponge cells supports its classification under the animal kingdom? (i) Absence of mitochondria (ii) Ability to photosynthesise (iii) Presence of a cell membrane (iv) Presence of a cell wall
The correct option is (iii) Presence of a cell membrane. Sponges are classified under Kingdom Animalia because they are multicellular, heterotrophic eukaryotes whose cells possess a cell membrane but lack a rigid cell wall. Since plants and fungi possess distinctive cell walls made of cellulose or cRead more
The correct option is (iii) Presence of a cell membrane. Sponges are classified under Kingdom Animalia because they are multicellular, heterotrophic eukaryotes whose cells possess a cell membrane but lack a rigid cell wall. Since plants and fungi possess distinctive cell walls made of cellulose or chitin, the absence of a cell wall and dependence on ingested organic nutrients confirm sponges are animals.
For more NCERT Solutions of Class 9 Science Exploration Chapter 12 Patterns in Life Diversity and Classification Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-12/
See lessObserve two different animals in your immediate environment. What features help you distinguish between them? How do these features help place them into different groups?
(i) Distinguishing features: A pigeon possesses feathers, wings, a beak and an internal bony backbone, whereas an earthworm exhibits a soft, cylindrical, segmented body lacking limbs, skeleton and eyes. (ii) Group placement: The internal vertebral column and aerial adaptations place the pigeon intoRead more
(i) Distinguishing features: A pigeon possesses feathers, wings, a beak and an internal bony backbone, whereas an earthworm exhibits a soft, cylindrical, segmented body lacking limbs, skeleton and eyes. (ii) Group placement: The internal vertebral column and aerial adaptations place the pigeon into Chordata (Aves), while the metameric segmentation, lack of backbone and hydrostatic support classify the earthworm into Invertebrata (Annelida).
For more NCERT Solutions of Class 9 Science Exploration Chapter 12 Patterns in Life Diversity and Classification Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-12/
See lessHow would a scientist justify choosing cellular organisation as a more fundamental characteristic for the basis of classification rather than the presence of xylem and phloem?
Cellular organization represents a universal characteristic that applies to every living organism on Earth, establishing primary divisions between prokaryotic and eukaryotic structures, as well as unicellular and multicellular forms. Conversely, vascular tissues like xylem and phloem are specializedRead more
Cellular organization represents a universal characteristic that applies to every living organism on Earth, establishing primary divisions between prokaryotic and eukaryotic structures, as well as unicellular and multicellular forms. Conversely, vascular tissues like xylem and phloem are specialized adaptations found exclusively in higher plants. Therefore, cellular structure forms a far broader, more fundamental foundation for classifying all five kingdoms.
For more NCERT Solutions of Class 9 Science Exploration Chapter 12 Patterns in Life Diversity and Classification Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-12/
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