Q1: Which of the following is the defining characteristic that separates prokaryotic cells from eukaryotic cells? (a) Presence of a cell wall (b) Absence of a membrane-enclosed nucleus (c) Ability to photosynthesise (d) Multicellular organisation
Solution:
Ans: (b) Explanation: Prokaryotic cells have genetic material that floats freely without a membrane-enclosed nucleus, whereas eukaryotic cells possess a true membrane-bound nucleus enclosing their genetic material.
Q2: What material makes up the cell walls of fungi, distinguishing them from plants? (a) Cellulose (b) Pectin (c) Chitin (d) Lignin
Solution:
Ans: (c) Explanation: Fungal cell walls contain chitin, the same tough material found in insect shells, which clearly distinguishes them from plant cell walls made mainly of cellulose.
Q3: Which plant group is called the "amphibians of the plant kingdom" because they need water for reproduction? (a) Pteridophyta (b) Bryophyta (c) Thallophyta (d) Gymnosperm
Solution:
Ans: (b) Explanation: Bryophytes are called amphibians of the plant kingdom because their male reproductive cells must swim through water to reach eggs, requiring a wet environment for reproduction.
Q4: Which scientist introduced the binomial nomenclature system for naming organisms? (a) Robert H. Whittaker (b) Aristotle (c) Carolus Linnaeus (d) Ernst Haeckel
Solution:
Ans: (c) Explanation: Carolus Linnaeus developed binomial nomenclature in the 18th century, creating a universal two-part naming system written in Latin for scientifically identifying organisms worldwide.
Q5: What advancement do Nematoda (roundworms) have over Platyhelminthes (flatworms) regarding body structure? (a) Bilateral symmetry (b) Two separate body openings for mouth and anus (c) Tissue-level organisation (d) Presence of an exoskeleton
Solution:
Ans: (b) Explanation: Roundworms possess two separate body openings-a mouth and an anus-allowing one-directional food movement and more efficient digestion compared to flatworms' single opening.
Fill in the Blanks
Q1: Species found only in a particular region and nowhere else on Earth are called _____ species.
Solution:
Ans: endemic
Q2: The flexible, rod-shaped internal support structure that runs along the body in chordates is called the _____.
Solution:
Ans: notochord
Q3: Cyanobacteria are photosynthetic prokaryotes that gradually converted Earth's atmosphere by releasing _____.
Solution:
Ans: oxygen
Q4: The undifferentiated body of thallophytes with no separation into root, stem, or leaf is called a _____.
Solution:
Ans: thallus
Q5: Ancient fossilised cyanobacteria preserved in layered rock formations are called _____.
Solution:
Ans: stromatolites
True or False
Q1: Lichens are extremely sensitive to air pollution and serve as natural air-quality indicators.
Solution:
Ans: True Explanation: Lichens are highly sensitive to air pollution and change colour as pollution levels rise, making them reliable natural indicators of air quality.
Q2: All fungi are multicellular organisms.
Solution:
Ans: False Explanation: While most fungi are multicellular, yeast is a unicellular fungus placed in Kingdom Fungi because its cell walls contain chitin.
Q3: Angiosperms produce seeds that sit exposed on cones without being enclosed within a fruit.
Solution:
Ans: False Explanation: Gymnosperms, not angiosperms, produce seeds exposed on cones. Angiosperms evolved fruits to protect and disperse seeds across wide areas.
Q4: Arthropods have an external skeleton made of chitin that protects the body and reduces water loss.
Solution:
Ans: True Explanation: Arthropods possess a hard exoskeleton made of chitin which protects their body, dramatically reduces water loss, and allows them to thrive in dry conditions.
Q5: Robert H. Whittaker introduced the four kingdom classification system in 1969.
Solution:
Ans: False Explanation: Robert H. Whittaker introduced the five kingdom classification system in 1969 by giving fungi their own kingdom separate from plants.
Match the Following
Column A
Column B
1. Kingdom Monera
A. Segmented worms with true body cavity
2. Pteridophyta
B. Unicellular prokaryotes without membrane-bound nucleus
3. Annelida
C. Jointed appendages with exoskeleton made of chitin
4. Echinodermata
D. Internal calcium carbonate skeleton without notochord
5. Arthropoda
E. Plants with vascular tissue but no seeds
Solution:
Ans:
1 - B: Kingdom Monera includes bacteria and cyanobacteria that are unicellular prokaryotes with genetic material floating freely without a membrane-enclosed nucleus.
2 - E: Pteridophytes like ferns have true roots, stems, leaves, and vascular tissue (xylem and phloem) but do not produce seeds.
3 - A: Annelida includes earthworms and leeches with bodies divided into repeating segments and a true internal body cavity for organ development.
4 - D: Echinoderms like starfish and sea urchins possess an internal skeleton made of calcium carbonate but lack a notochord structure.
5 - C: Arthropods have jointed appendages and a hard exoskeleton made of chitin, making them the largest animal group on Earth.
Short Answer Questions
Q1: Why is India considered a biodiversity hotspot?
Solution:
Ans: India has extraordinary landscape variety including Himalayan peaks, northeastern rainforests, the Thar desert, southern plateaus, and long coastlines. Each habitat has unique climate, soil, and species. India hosts many endemic species found nowhere else. Four global biodiversity hotspots overlap with India: Western Ghats, Indo-Burma, Himalayas, and Sundaland, making conservation critically important.
Q2: Explain the role of fungi in ecosystems.
Solution:
Ans: Fungi are mostly saprophytes that feed on dead organic material like fallen leaves, rotting wood, and dead animals. They secrete enzymes externally to digest matter, then absorb nutrients through their mycelium network. This makes them nature's recyclers. Without fungi, dead organic matter would accumulate and nutrients locked inside would never return to soil.
Q3: What are the four criteria underlying Whittaker's five kingdom classification system?
Solution:
Ans: The four criteria are: cell type (prokaryote or eukaryote), cell structure (cell wall present or absent), level of organisation (unicellular or multicellular), and mode of nutrition (autotrophic or heterotrophic). Whittaker used these criteria to create five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia, placing organisms based on fundamental biological differences.
Q4: How do gymnosperms differ from angiosperms in reproduction and structure?
Solution:
Ans: Gymnosperms produce naked seeds exposed on cones without fruits. They have needle-like or scale-like leaves minimising water loss, helping them survive cold and arid conditions. Angiosperms evolved flowers to attract pollinators and fruits to protect and disperse seeds. These innovations made angiosperms more efficient in reproduction and allowed them to colonise diverse habitats.
Q5: Why is biological classification important for studying biodiversity?
Solution:
Ans:
It organises and systematises the study of millions of living organisms
Helps understand similarities, differences, and relationships among organisms
Aids in identifying and naming newly discovered organisms
Supports biodiversity conservation by identifying threatened species
Allows scientists worldwide to communicate using a common system
Long Answer Questions
Q1: Trace the evolution of plant adaptation to land across the five plant groups in Kingdom Plantae.
Solution:
Ans:
Thallophyta (algae) are primitive plants with undifferentiated bodies living mostly in water
Bryophytes made the first leap to land but need water for reproduction, earning the name "amphibians of the plant kingdom"
Pteridophytes developed vascular tissue (xylem and phloem) allowing them to grow taller, though still requiring water for reproduction
Gymnosperms evolved seeds eliminating water dependency during fertilisation, with needle-like leaves reducing water loss
Angiosperms developed flowers and fruits making reproduction highly efficient and enabling colonisation of almost every habitat on Earth
Q2: Analyse how the body organisation of invertebrates progresses from simple to complex forms across different phyla.
Solution:
Ans:
Porifera (sponges) show cellular-level organisation without true tissues
Cnidaria developed true tissues enabling active feeding
Platyhelminthes introduced bilateral symmetry and organ-level organisation allowing directed movement
Nematoda advanced to organ systems with two body openings for efficient digestion
Annelida added body segmentation and true body cavities for precise movement control
Arthropoda developed jointed appendages and exoskeletons
Echinodermata evolved internal skeletons foreshadowing vertebrate skeletal support
Q3: Evaluate the importance of biodiversity for ecosystem stability and human welfare, providing specific examples.
Solution:
Ans:
Ocean algae generate much of atmospheric oxygen while bacteria and fungi decompose dead matter returning nutrients to soil
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