I. Choose the Correct Answer (MCQs)
Q1. The study of living things or organisms is called ______ (a) Psychology (b) Biology (c) Zoology (d) Botany
Q2. Which of the following are characteristics of living beings? i. Respiration ii. Reproduction iii. Adaptation iv. Excretion (a) i, ii and iv only (b) i and ii only (c) ii and iv only (d) i, iv, ii and iii
Q3. Lizards breathe through their ______ (a) Skin (b) Gills (c) Lungs (d) Trachea
Q4. All animals need (a) Food and water only (b) Water only (c) Air, food and water (d) Food only
Q5. Which animal has the special organs of breathing called gills? (a) Earthworm (b) Fox (c) Fish (d) Frog
Q6. Choose the set that represents only biotic components of a habitat (a) Tiger, Deer, Grass, Soil (b) Rocks, Soil, Plants, Air (c) Sand, Turtle, Crab, Rocks (d) Aquatic plant, Fish, Frog, Insects
Q7. Which of the following cannot be called a habitat? (a) A desert with camels (b) A pond with fish and snails (c) Cultivated land with grazing cattle (d) A jungle with wild animals
Q8. Birds fly in the air with the help of (a) Heavy and strong bones (b) Soft and thick bones (c) Hollow and light bones (d) Flat and thick bones
Q9. Paramecium moves from one place to another with the help of ______ (a) Pseudopodia (b) Flagella (c) Foot (d) Cilia
Q10. Kangaroo rat lives in (a) Aquatic habitat (b) Desert habitat (c) Grassland habitat (d) Mountain habitat
Additional MCQs
Q11. Which is not a biotic community? (a) Plants (b) Birds (c) Air (d) Elephant
Q12. The locomotory organ of Amoeba: (a) Pseudopodia (b) Cilia (c) Flagella (d) None
Q13. Jurong Bird Park is located in (a) America (b) Singapore (c) Japan (d) Germany
Q14. The animal that never drinks water: (a) Rat (b) Cat (c) Dog (d) Cow
Q15. Lizards walk with four legs and it is known as (a) Bipedal (b) Tripedal (c) Monopedal (d) Quadripedal
Q16. Vedanthangal is a ______ sanctuary (a) Birds (b) Tiger (c) Elephant (d) Deer
Q17. The movement of animals to a different location due to seasonal change is called (a) Hibernation (b) Aestivation (c) Migration (d) Adaptation
Q18. ______ can live for many days without drinking water. (a) Dog (b) Elephant (c) Cow (d) Camel
Q19. Camel passes ______ amount of urine. (a) Small (b) Large (c) Moderate (d) Too large
II. Fill in the Blanks
1. Aquatic, deserts, mountains are called habitats.
2. Based on the number of cells present, animals are classified into unicellular and multicellular.
3. Tail of a bird acts as a rudder which helps to control the direction of movement.
4. Amoeba moves with the help of pseudopodia (false foot).
Additional Fill in the Blanks
5. Living things are made of small units called cells.
6. Organisms made of many cells are called multicellular organisms.
7. Unicellular organisms are small, usually microscopic in nature, and cannot be seen with the naked eye.
8. In Amoeba, contractile vacuoles help in excretion.
9. Fish has fins for swimming.
10. Birds have a streamlined body covered with feathers.
11. Camel is called the Ship of the Desert.
III. True or False (with corrections)
Q1. A habitat is a living or dwelling place of an organism. Answer: True ✓
Q2. The geographical features and environmental conditions on earth remain the same from one place to another. Answer: False ✗ — The geographical features and environmental conditions on earth differ from one place to another.
Q3. Amoeba is a unicellular organism and moves with pseudopodia. Answer: True ✓
Q4. Birds can see only one object at a time. Answer: False ✗ — Birds can see two objects at a time (binocular vision).
Q5. Paramecium is a multicellular organism. Answer: False ✗ — Paramecium is a unicellular organism.
Additional True or False
Q6. Fishes are unicellular organisms. Answer: False ✗ — Fishes are multicellular organisms.
Q7. In Amoeba, reproduction is by simple diffusion through the body surface. Answer: False ✗ — In Amoeba, respiration (not reproduction) is by simple diffusion through the body surface. Reproduction in Amoeba is by binary fission.
Q8. In unicellular organisms, growth occurs by increase in cell size. Answer: True ✓
Q9. The streamlined body shape of fish helps it to move through water easily. Answer: True ✓
Q10. Some fishes have the capacity to rotate the head around the head joint. Answer: False ✗ — Some lizards (not fishes) have the capacity to rotate their head around the head joint.
Q11. The movement of animals to different locations due to season changes is called adaptation. Answer: False ✗ — It is called migration. Adaptation refers to structural or behavioural changes that help an organism survive in its habitat.
Q12. Spending the hot and dry period in an inactive state is known as aestivation. Answer: True ✓
IV. Complete the Following
1. Tropical rain forests, grasslands, and deserts are known as habitats.
2. Some living things are made of a single cell; they are called unicellular organisms.
3. The breathing organ of a fish is known as gills.
4. The lizard moves on the ground with its claw on its feet.
5. Camel stores fat in its hump.
V. Match the Following
Set 1
| Organism | Feature | Answer |
|---|---|---|
| Polar bear | (a) Strong hooves, long hair | d — Thick skin, white fur |
| Penguin | (b) Strong runner, sharp claws | c — Paddle to swim, walks on two legs |
| Mountain goat | (c) Paddle to swim, walks on two legs | a — Strong hooves, long hair |
| Lion | (d) Thick skin, white fur | b — Strong runner, sharp claws |
Set 2
| Organism | Feature | Answer |
|---|---|---|
| Bird | (a) Stores water in body | c — Wings (modified forelimbs) |
| Fish | (b) Rotates head around head joint | d — Gills as respiratory organ |
| Lizard | (c) Wings (modified forelimbs) | b — Rotates head around head joint |
| Camel | (d) Gills as respiratory organ | a — Stores water in body |
VI. Analogies
1. Fish : Water :: Elephant : Land
2. Euglena : Flagellum :: Cilia : Paramecium
3. Euglena : Unicellular :: Human being : Multicellular
4. Fish respiratory organ : Gills :: Bird's breathing organ : Lungs
5. Fins : Fish :: Feather : Bird
6. Turtle : Hibernation :: Snail : Aestivation
7. Beak : Bird's mouth :: Hump : Fat stored in Camel
VII. Very Short Answer Questions
Q1. How do birds catch their prey? Answer: Birds catch their prey with the help of a pair of clawed feet.
Q2. Where can we see camels in India? Answer: We can see camels in Rajasthan.
Q3. Name the locomotory organ of an Amoeba. Answer: Pseudopodia (false foot).
Q4. What are the body parts of a snake? Answer: Head, eyes, nostrils, mouth, belly, and tail.
Q5. Which structure helps the bird to change its direction while flying in the air? Answer: The tail of the bird acts as a rudder and helps it change direction while flying.
VIII. Short Answer Questions
Q1. Differentiate between unicellular and multicellular organisms.
| Feature | Unicellular | Multicellular |
|---|---|---|
| Cell composition | Made up of a single cell | Made up of many cells |
| Function | One cell performs all life functions | Different cells perform different functions |
| Size | Very small (microscopic) | Mostly large, visible to the naked eye |
| Organization | Lack tissues, organs, and organ systems | Composed of tissues and organ systems |
| Growth | By increase in cell size | By increase in number of cells via division |
| Examples | Amoeba, Paramecium, Euglena | Earthworm, Fish, Frog, Lizard, Human being |
Q2. Write the adaptive features of Polar bear and Penguin.
Polar bear:
- Thick skin for protection against extreme cold
- White fur for camouflage in snow
Penguin:
- Paddle-like limbs to swim in water
- Walks with two legs (bipedal locomotion)
Q3. Mention the features that help a bird to fly in the air.
1. Streamlined body covered with feathers — provides minimum air resistance 2. A pair of wings (modified forelimbs) — generate lift 3. Hollow and light bones — reduce body weight 4. Strong chest muscles — withstand air pressure during flight
Q4. What are the different types of invertebrates?
| Group | Examples |
|---|---|
| Porifera | Sponges |
| Ctenophora | Comb jellies |
| Cnidaria | Hydras, jellyfishes, sea anemones, corals |
| Echinodermata | Starfishes, sea urchins, sea cucumbers |
| Platyhelminthes | Flatworms |
| Nematoda | Round or thread worms |
| Annelida | Earthworms, leeches |
| Arthropoda | Insects, arachnids |
| Mollusca | Snails, octopuses |
Q5. List the locomotory organs of unicellular organisms.
| Organism | Locomotory Organ |
|---|---|
| Amoeba (Protozoa) | Pseudopodia |
| Paramecium | Cilia |
| Euglena | Flagellum |
Q6. Two differences between Paramecium and Euglena.
| Feature | Paramecium | Euglena |
|---|---|---|
| Locomotory organ | Cilia | Flagellum |
| Chloroplast | Absent | Present (can photosynthesise) |
Q7. What is meant by aestivation? Answer: Aestivation is the state of spending the hot and dry period in an inactive condition. Example: Snails aestivate during summer.
Q8. What are the important adaptive features of fish? Answer: Fish have gills as their respiratory organ, which help them absorb oxygen dissolved in water rather than from the atmosphere. Their streamlined body shape allows easy movement through water, and fins help in steering and balancing.
Q9. What is binocular vision? Answer: Birds can see one object with one eye and another object with the other eye simultaneously. This ability is called binocular vision.
Q10. Define migration. Answer: When an animal moves its location as the season changes, it is called migration. Example: Many birds from Siberia and Russia migrate to Vedanthangal in Tamil Nadu during winter.
Q11. Which is called the "Ship of the Desert"? Why? Answer: The camel is called the Ship of the Desert because it has large, flat padded feet that help it walk easily on soft sand, just as a ship moves smoothly on water.
IX. Detailed Answer Questions
Q1. Describe the various features which help the camel dwell well in the desert.
1. Long legs — keep the body away from the hot sand surface 2. Water storage — can drink large amounts of water and store it in the body 3. Water conservation — passes small amount of urine; does not sweat; loses very little water, so it can live many days without drinking 4. Hump stores fat — which can be broken down for nourishment in emergencies 5. Large, flat padded feet — make walking on sand easy without sinking 6. Long eyelashes and hairs — protect eyes and ears from blowing dust and sand 7. Closeable nostrils — can be closed to avoid dust entering the respiratory tract
Q2. Describe various adaptive features of birds.
1. Streamlined body covered with feathers — reduces air resistance during flight 2. Beak instead of mouth — lighter than jaws with teeth 3. Lungs for breathing — efficient oxygen intake for flight 4. Hollow and light bones — reduce overall body weight for easier flight 5. Tail — acts as a rudder to control direction of movement in the air 6. Strong chest muscles — power the wing beats needed for flight 7. Binocular vision — can see two objects simultaneously, aiding in prey detection
Q3. List the adaptations present in the lizard.
1. Strong four limbs — enable quick movement and grip on surfaces 2. Ability to rotate head around the head joint — provides wide field of vision to detect predators 3. Respiration through lungs — efficient breathing on land 4. Teeth adapted for grabbing and holding — help catch and hold prey 5. Clawed feet — provide grip while moving on ground or climbing 6. Some lizards have webbed toes — enable gliding or parachuting through air for soft landings
Q4. Compare the adaptations of animals in different habitats.
| Habitat | Animal | Key Adaptations |
|---|---|---|
| Desert | Camel | Long legs, hump with fat, padded feet, closeable nostrils, water conservation |
| Desert | Kangaroo rat | Never drinks water; gets moisture from food |
| Polar region | Polar bear | Thick skin, white fur for camouflage in snow |
| Polar region | Penguin | Paddle-like limbs for swimming, bipedal walking |
| Mountain | Mountain goat | Strong hooves, long hair for warmth |
| Grassland | Lion | Strong runner, sharp claws for hunting |
| Aquatic | Fish | Gills for breathing, streamlined body, fins for movement |
| Aerial | Bird | Hollow bones, wings, feathers, streamlined body |
Common Mistakes
1. Confusing migration with adaptation — Migration is seasonal movement to a different location. Adaptation is a structural or behavioural change that helps survival in the current habitat.
2. Calling all small organisms unicellular — Size alone does not determine cell count. Many small insects and worms are multicellular. Only organisms like Amoeba, Paramecium, and Euglena are truly unicellular.
3. Saying "birds see one object at a time" — Birds actually have binocular vision and can see two objects simultaneously (one with each eye).
4. Confusing aestivation and hibernation — Aestivation is inactivity during hot/dry periods (e.g., snails in summer). Hibernation is inactivity during cold periods (e.g., turtles in winter).
5. Calling cultivated land a habitat — A habitat must be a natural environment. Cultivated land with grazing cattle is human-made and does not qualify as a natural habitat.
6. Confusing pseudopodia, cilia, and flagella — Amoeba uses pseudopodia (false foot), Paramecium uses cilia (hair-like structures), and Euglena uses flagellum (whip-like tail). Each is a different locomotory organ.
7. Saying "camel stores water in its hump" — The hump stores fat, not water. The fat can be broken down for energy and produces metabolic water as a byproduct.
Exam Checklist
- [ ] Can define habitat and distinguish between biotic and abiotic components
- [ ] Can name the five types of habitats: aquatic, desert, mountain, grassland, polar
- [ ] Can differentiate unicellular vs multicellular organisms with examples
- [ ] Can match locomotory organs: Amoeba (pseudopodia), Paramecium (cilia), Euglena (flagellum)
- [ ] Can list adaptations of camel for desert, polar bear for polar region, fish for aquatic habitat
- [ ] Can explain why birds can fly: hollow bones, wings, feathers, streamlined body, tail as rudder
- [ ] Can distinguish migration, hibernation, and aestivation with examples
- [ ] Can list all nine groups of invertebrates with examples
- [ ] Know that camel hump stores fat (not water)
- [ ] Know that cultivated land is not a natural habitat
- [ ] Can explain binocular vision in birds
- [ ] Can define adaptation and give at least three examples