Class 8 Science English Vershion Full
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
আমরা দিচ্ছি স্বল্পমূল্যে একাডেমিক এডিটেবল Word File যা আপনি আপনার পিসিতে এডিট করতে পারবেন। নিচে আমাদের প্যাকেজের মূল্য তালিকা দেওয়া আছে। আপনি আপনার পছন্দ মতো প্যাকেজটি কিনতে পারবেন।
প্যাকেজের নাম | মূল্য তালিকা | যা থাকবে |
গণিত প্যাকেজ | ১৯৯/- | ৩য় থেকে ১২শ শ্রেণির গণিতের Word File |
বিজ্ঞান প্যাকেজ | ২৩৫/- | ৪র্থ শ্রেণি থেকে ৯ম-১০ শ্রেণির বিজ্ঞান+সাইন্সের সকল সাবজেক্ট Word File |
ক্লাস ০৬ থেকে ১০ম (মাইক্রো প্যাকেজ) | ২৯৯/- | সকল সাবজেক্ট এর Word File+ফ্রি আপডেট |
ক্লাস ০৬ থেকে ১২শ (মিনি প্যাকেজ) | ৩৯৯/- | সকল সাবজেক্ট এর Word File+ফ্রি আপডেট |
ক্লাস ১ থেকে ১২শ (ফুল প্যাকেজ) | ৪৯৯/- | সকল সাবজেক্ট এর Word File+ফ্রি আপডেট প্রাথমিক শ্রেণির নোটগুলো আপডেট চলমান। কাজ শেষ হলে পাবেন। |
জব ও এডমিশন প্যাকেজ | ১৫০/- | ভার্সিটি ভর্তি+প্রাইমারি+বিসিএস+নিবন্ধন এর Word File+১০০ জবের জন্য স্পেশাল ফ্রি ইবুক+ফ্রি আপডেট |
Job Preparation Paid Ebooks | ১৯৯/- | সকল জবের জন্য বেসিক+শর্ট নোট |
English Grammar | ৯৯/- | Class 6 to HSC All English Grammar Topics |
এই ফাইলগুলো কাদের প্রয়োজন?
১। কোচিং সেন্টার
২।প্রাইভেট টিউটর
প্যাকেজে প্রতিটি ক্লাসের সবগুলো সাবজেক্ট এর সমাধান থাকবে। বোনাস হিসেবে থাকবে আমাদের তৈরি করা স্পেশাল জবের হ্যান্ড নোট। যা চাকরীর পরীক্ষার জন্য খুবই গুরুত্বপূর্ণ।
বিঃদ্রঃ যাদের পিসি নাই তারা ফাইলটি কিনার জন্য নক দিবেন না।
আমাদের কাছ থেকে প্যাকেজ কিনলে আমরা যতবার আপডেট করবো ততবার ফ্রি আপডেট পাবেন।
আপডেটঃ- আমরা কিভাবে আপডেট দিবো?
আপনার ইমেইল আমাদের গুগোল ড্রাইভে শেয়ার করা থাকবে। সেখানে আপডেট নামের একটা ফোল্ডার পাবেন। সেই ফোল্ডারে আমরা আপডেট শেয়ার করে দিবো।
কিভাবে কিনবেনঃ-
আপনি মোবাইল ব্যাংকিং এর মাধ্যমে আমাদের এই প্যাকেজগুলো কিনতে পারবেন। বিকাশ/নগদ/উপায় থেকে আমাদের পার্সোনাল বিকাশ নাম্বার 01974581611 এ টাকা প্রেরণ করবেন। রেফারেন্স হিসেবে প্যাকেজের নাম দিবেন। এরপর স্কিনশর্ট নিয়ে আমাদের অফিসিয়াল WhatsApp: 01300430768 এ পাঠাবেন। আপনাকে উক্ত প্যাকেজের গুগোল ড্রাইভের এক্সেস দেওয়া হবে এবং প্রয়োজনীয় ফন্ট শেয়ার করা হবে।
Chapter -1
Classification of Animal Worlds
Taxonomy: The method of identifying
organisms based on similarities and differences is called taxonomy. In order to
identify an unknown organism, it is necessary to compare it with familiar and
known organisms, and then classify it accordingly.
Taxonomic classification: Gradually,
scientists have developed a specific sequential system of taxonomy.
Generic naming or binomial naming: A
scientific name of an organism is usually a binomial name. It is called generic
naming or binomial naming.
Example: The scientific name of humans is Homo sapiens. This name is
written in Latin or Greek.
Taxonomy of animal kingdom: Scientists
have divided the animal kingdom into two major groups based on the presence or
absence of vertebral column.
Invertebrate animal classification:
Invertebrate animals are classified into the following 8 phyla:
1.
Porifera
2.
Coelenterate
3.
Platyhelminthes
4.
Nematoda
5.
Annelida
6.
Arthropoda
7.
Mollusca
8.
Echinodermata
Vertebrate animal classification:
Vertebrate animals are divided into three subgroups based on their notochord.
They are:
1.
Protochordata
2.
Hemichordata
3.
Vertebrata
Among these, vertebrates are again divided into 7 classes:
4.
Cyclostomata
5.
Pisces
6.
Amphibia
7.
Reptilia
8.
Aves
9.
Mammalia
10.Humans
Humans in animal taxonomy: Humans
belong to the class Mammalia of the phylum Chordata.
Significance of taxonomy: Taxonomy is
necessary for identifying, describing, and classifying all known and unknown
living beings of the world in a systematic way.
Classification of the Animal Kingdom
Classification is the systematic
arrangement of organisms into groups based on their similarities and
differences. In biology, animals are classified to better understand their
evolutionary relationships and characteristics.
🔷 Major Levels of Classification (Taxonomic
Hierarchy)
From broad to specific, the hierarchy
includes:
1.
Kingdom
2.
Phylum
3.
Class
4.
Order
5.
Family
6.
Genus
7.
Species
Animal Kingdom (Kingdom Animalia)
Animals are multicellular, eukaryotic,
heterotrophic organisms that lack cell walls. They are divided into two main
categories:
1. Invertebrates (Animals without a
backbone)
2. Vertebrates (Animals with a
backbone)
Classification of Invertebrates
🔹 1. Phylum Porifera (Sponges)
- Body with pores (ostia)
- Aquatic, mostly marine
- No true tissues or organs
- Example: Sycon, Spongilla
🔹 2. Phylum Coelenterata (Cnidaria)
- Radial symmetry
- Body with a central gastrovascular cavity
- Tentacles with stinging cells
(cnidocytes)
- Example: Hydra, Jellyfish, Sea
anemone
🔹 3. Phylum Platyhelminthes (Flatworms)
- Bilaterally symmetrical
- Flattened body
- Mostly parasitic
- Example: Planaria, Tapeworm
🔹 4. Phylum Nematoda (Roundworms)
- Cylindrical, unsegmented body
- Pseudocoelomates
- Mostly parasitic
- Example: Ascaris, Hookworm
🔹 5. Phylum Annelida (Segmented worms)
- Segmented body
- True coelom
- Closed circulatory system
- Example: Earthworm, Leech
🔹 6. Phylum Arthropoda
- Largest phylum of Animalia
- Jointed appendages, segmented body
- Exoskeleton made of chitin
- Example: Insects, Spiders, Crabs
🔹 7. Phylum Mollusca
- Soft body, often with a hard shell
- Muscular foot and mantle
- Example: Snail, Octopus, Mussel
🔹 8. Phylum Echinodermata
- Radial symmetry in adults
- Marine animals with spiny skin
- Water vascular system
- Example: Starfish, Sea urchin
🐛 Classification of Invertebrates
Invertebrates are animals without a
backbone or vertebral column. They make up about 95% of all known animal
species and are incredibly diverse in structure and habitat.
Invertebrates are mainly classified
into the following eight major phyla:
🔹 1. Phylum Porifera (Sponges)
- Body structure: Pore-bearing, simple body
without true tissues or organs
- Symmetry: Asymmetrical or radially
symmetrical
- Habitat: Mostly marine
- Key Features: Water canal system for
feeding and respiration
- Examples: Sycon, Spongilla,
Euplectella
🔹 2. Phylum Coelenterata / Cnidaria
- Body structure: Two cell layers
(diploblastic), body with a single opening
- Symmetry: Radial symmetry
- Key Features: Tentacles with stinging
cells (cnidocytes)
- Habitat: Aquatic (mostly marine)
- Examples: Hydra, Jellyfish
(Aurelia), Sea anemone
🔹 3. Phylum Platyhelminthes (Flatworms)
- Body structure: Flattened, ribbon-like
body
- Symmetry: Bilateral symmetry
- Tissue layers: Triploblastic (three
layers)
- Key Features: Mostly parasitic,
acoelomate (no body cavity)
- Examples: Planaria, Tapeworm
(Taenia), Liver fluke (Fasciola)
🔹 4. Phylum Nematoda (Roundworms)
- Body structure: Cylindrical, unsegmented
body
- Symmetry: Bilateral symmetry
- Coelom: Pseudocoelomate
- Key Features: Many are parasitic
- Examples: Ascaris, Hookworm,
Filarial worm
🔹 5. Phylum Annelida (Segmented Worms)
- Body structure: Segmented, worm-like body
- Symmetry: Bilateral symmetry
- Coelom: True coelom (eucoelomate)
- Key Features: Closed circulatory system
- Examples: Earthworm, Leech,
Nereis
🔹 6. Phylum Arthropoda
- Body structure: Segmented body, jointed
appendages
- Exoskeleton: Made of chitin
- Symmetry: Bilateral symmetry
- Diversity: Largest animal phylum
- Examples: Insects (Ants, Butterflies),
Spiders, Crabs, Scorpions
🔹 7. Phylum Mollusca
- Body structure: Soft body, often with a
hard calcareous shell
- Symmetry: Bilateral
- Key Features: Muscular foot for movement,
mantle, and visceral mass
- Examples: Snail, Octopus, Clam,
Mussel
🔹 8. Phylum Echinodermata
- Body structure: Spiny skin, endoskeleton
of calcareous plates
- Symmetry: Radial (in adults), bilateral
(in larvae)
- Habitat: Exclusively marine
- Key Features: Water vascular system, tube
feet
- Examples: Starfish, Sea urchin,
Sea cucumber
📝 Summary Table
|
Phylum |
Symmetry |
Body Cavity |
Example(s) |
|
Porifera |
Asymmetrical |
No true cavity |
Sycon, Spongilla |
|
Cnidaria |
Radial |
No true cavity |
Hydra, Jellyfish |
|
Platyhelminthes |
Bilateral |
Acoelomate |
Tapeworm, Planaria |
|
Nematoda |
Bilateral |
Pseudocoelomate |
Ascaris, Hookworm |
|
Annelida |
Bilateral |
True coelom |
Earthworm, Leech |
|
Arthropoda |
Bilateral |
True coelom |
Insects, Crabs |
|
Mollusca |
Bilateral |
True coelom |
Snail, Octopus |
|
Echinodermata |
Radial (adult) |
True coelom |
Starfish, Sea urchin |
Classification of Vertebrates (Phylum
Chordata)
Chordates possess a notochord (at
least in embryonic stage), dorsal nerve cord, and gill slits.
🔹 1. Class Pisces (Fishes)
- Aquatic, gills for respiration
- Fins for movement
- Cold-blooded
- Example: Rohu, Shark
🔹 2. Class Amphibia
- Live both on land and in water
- Moist skin, no scales
- Cold-blooded
- Example: Frog, Toad
🔹 3. Class Reptilia
- Dry, scaly skin
- Lay eggs with leathery shells
- Cold-blooded
- Example: Lizard, Snake, Crocodile
🔹 4. Class Aves (Birds)
- Feathers and beak
- Lay hard-shelled eggs
- Warm-blooded
- Example: Pigeon, Crow, Eagle
🔹 5. Class Mammalia
- Body covered with hair
- Mammary glands (produce milk)
- Warm-blooded
- Give birth to young (mostly)
- Example: Human, Cow, Bat
🦴 Classification of Vertebrates
(Under Phylum Chordata – Subphylum
Vertebrata)
Vertebrates are animals that possess a
vertebral column (backbone) and a well-developed internal skeleton. They also
have a dorsal nerve cord, notochord (replaced by the vertebral column in
adults), and paired appendages.
🔹 1. Class Pisces (Fishes)
- Habitat: Aquatic (freshwater and marine)
- Body Covering: Scales
- Respiration: Gills
- Limbs: Fins
- Fertilization: Usually external
- Temperature regulation: Cold-blooded
(ectothermic)
- Examples: Rohu, Shark, Catfish, Goldfish
🔹 2. Class Amphibia
- Habitat: Both aquatic and terrestrial
(dual life)
- Body Covering: Moist, scale-less skin
- Respiration: Gills (in larvae), lungs and
skin (in adults)
- Limbs: Two pairs
- Fertilization: External (mostly)
- Temperature regulation: Cold-blooded
- Examples: Frog, Toad, Salamander
🔹 3. Class Reptilia
- Habitat: Terrestrial (some semi-aquatic)
- Body Covering: Dry skin with scales
- Respiration: Lungs
- Limbs: Usually four (absent in snakes)
- Fertilization: Internal; lays shelled
eggs
- Temperature regulation: Cold-blooded
- Examples: Lizard, Snake, Crocodile,
Tortoise
🔹 4. Class Aves (Birds)
- Habitat: Terrestrial (some aquatic)
- Body Covering: Feathers
- Respiration: Lungs with air sacs
- Limbs: Two wings and two legs
- Fertilization: Internal; lays
hard-shelled eggs
- Temperature regulation: Warm-blooded
(endothermic)
- Examples: Crow, Pigeon, Eagle, Duck,
Penguin
🔹 5. Class Mammalia
- Habitat: Terrestrial, aquatic, aerial
(diverse)
- Body Covering: Hair or fur
- Respiration: Lungs
- Limbs: Two pairs (varied use: walking,
swimming, flying)
- Fertilization: Internal; mostly give
birth to young (viviparous)
- Special Feature: Mammary glands to
nourish young
- Temperature regulation: Warm-blooded
- Examples: Human, Cow, Tiger, Dolphin, Bat
🧬 In-depth Explanation: Importance of
Classification of Living Organisms
Classification, also known as
taxonomy, is essential for organizing the enormous diversity of life on Earth.
There are over 1.5 million known species, and millions more yet to be
discovered. Without a proper system of classification, studying them would be
nearly impossible.
🔹 1. Facilitates Accurate Identification
- Classification allows biologists to
accurately identify and name organisms.
- For example, two different organisms may
have similar common names in different regions. Scientific classification
avoids such confusion by using universal scientific names (binomial
nomenclature).
🔹 2. Helps Understand Evolutionary
Relationships
- Classification reflects the evolutionary
history (phylogeny) of organisms.
- Organisms grouped in the same category
often share a common ancestor.
- This helps scientists trace how life has
evolved over time and how species are interconnected.
🔹 3. Simplifies the Study of Biodiversity
- The biosphere contains an enormous range
of organisms.
- Classification arranges them into
hierarchical categories (kingdom, phylum, class, order, family, genus,
species), making it easier to organize and retrieve information.
🔹 4. Enables Prediction of Characteristics
- Once an organism is classified, we can
predict its structure, behavior, and ecology based on the traits of other
members of the group.
- Example: If a newly discovered organism
is classified under the class Mammalia, we can infer it is warm-blooded,
has hair, and produces milk.
🔹 5. Essential for Scientific Communication
- Classification uses standard scientific
names (Latin or Greek) that are accepted globally.
- This removes language barriers and
ensures that scientists worldwide understand each other without confusion
caused by local or common names.
🔹 6. Aids in Conservation Biology
- Through classification, we can identify
endangered species and their relatives.
- This helps in making informed decisions
about biodiversity conservation, habitat protection, and breeding
programs.
🔹 7. Assists in Medical and Agricultural
Research
- Classification of microbes, pests, and
plants helps in:
- Discovering new medicines or vaccines
- Identifying disease vectors
- Developing improved crop varieties
- Example: Knowing the classification of
bacteria allows researchers to find related bacteria that may have useful
antibiotic properties.
🔹 8. Helps in Tracing Geographic Distribution
- Classification allows researchers to
study the distribution of species across regions (biogeography).
- This helps in understanding how
environmental factors influence the adaptation and spread of organisms.
🔹 9. Facilitates Comparative Studies
- It makes it easier to compare anatomy,
physiology, genetics, and behavior across different groups.
- This is essential in fields like
comparative anatomy, embryology, and molecular biology.
🔹 10. Supports Technological Advancement
- Biotechnology, genetic engineering, and
bioinformatics all rely on accurate classification for genetic
manipulation and analysis.
- Example: Genetic similarities between
humans and chimpanzees (both classified under order Primates)
support research in human evolution and disease modeling.
🐾 Important Q&A on Classification of Animal
Kingdom (In English)
✅ Short Questions and Answers:
1.
Q: What is the scientific term for the
classification of animals?
A: Taxonomy.
2.
Q: Who is known as the father of taxonomy?
A: Carl Linnaeus.
3.
Q: What are the major levels of biological
classification?
A: Kingdom, Phylum, Class, Order, Family, Genus, Species.
4.
Q: Which kingdom includes all animals?
A: Kingdom Animalia.
5.
Q: What is a species?
A: A group of organisms that can interbreed and produce fertile
offspring.
6.
Q: What is binomial nomenclature?
A: A two-name system of naming organisms using genus and species names.
7.
Q: What is the scientific name of humans?
A: Homo sapiens.
8.
Q: What is the main characteristic of
invertebrates?
A: They do not have a backbone.
9.
Q: Give an example of an invertebrate animal.
A: Earthworm.
10.Q: What is the main characteristic of
vertebrates?
A: They have a backbone or spinal column.
11.Q: Name five major groups of vertebrates.
A: Fish, Amphibians, Reptiles, Birds, Mammals.
12.Q: What phylum do humans belong to?
A: Phylum Chordata.
13.Q: What is the unique feature of Phylum
Porifera?
A: Presence of pores and a simple body structure (sponges).
14.Q: What animals are included in Phylum Cnidaria?
A: Jellyfish, hydra, sea anemones.
15.Q: Which phylum contains flatworms?
A: Platyhelminthes.
16.Q: What is segmentation in animals?
A: The division of the body into repetitive segments (e.g., in
annelids).
17.Q: Give an example of a segmented animal.
A: Earthworm (Phylum Annelida).
18.Q: Which phylum includes insects?
A: Arthropoda.
19.Q: Name one characteristic of arthropods.
A: Jointed legs and exoskeleton.
20.Q: What is an exoskeleton?
A: A hard external covering that supports and protects the body of some
animals.
21.Q: What is metamorphosis?
A: A biological process by which an animal changes its body structure
significantly during its life cycle.
22.Q: Which class of animals lays eggs and has
feathers?
A: Class Aves (birds).
23.Q: Name one cold-blooded animal class.
A: Reptiles.
24.Q: What is the difference between warm-blooded
and cold-blooded animals?
A: Warm-blooded animals maintain a constant body temperature;
cold-blooded animals depend on the environment.
25.Q: Which class of vertebrates produces milk for
their young?
A: Mammals.
26.Q: What are amphibians?
A: Animals that live both on land and in water (e.g., frogs).
27.Q: What is the main characteristic of fish?
A: Gills, fins, and living in water.
28.Q: What is bilateral symmetry?
A: A body plan where the left and right sides are mirror images.
29.Q: Which phylum shows radial symmetry?
A: Echinodermata (e.g., starfish).
30.Q: What does "chordates" mean?
A: Animals that have a notochord at some stage of development.
31.Q: What is the role of classification in
biology?
A: It helps organize and understand the diversity of life.
32.Q: What is a genus?
A: A group of related species.
33.Q: What is the difference between genus and
species?
A: Genus is a broader category, species is the most specific.
34.Q: What is a mammal?
A: A warm-blooded vertebrate with hair and mammary glands.
35.Q: Which class of animals is known for external
fertilization?
A: Amphibians and most fish.
36.Q: What is the scientific name of tiger?
A: Panthera tigris.
37.Q: What is the largest phylum in the animal
kingdom?
A: Arthropoda.
38.Q: Which animal group has both open and closed
circulatory systems in different classes?
A: Mollusca.
39.Q: What is the basis of modern classification?
A: Evolutionary relationships and genetic similarities.
40.Q: Who developed the modern system of
classification using domains and kingdoms?
A: Carl Woese.
🧬 40 MCQs on
Classification of Animal Kingdom with Answers
1. Who is known as the father
of taxonomy?
A) Charles Darwin
B) Carl Linnaeus
C) Aristotle
D) Gregor Mendel
✅ Answer:
B) Carl Linnaeus
2. How many kingdoms are there
in modern classification?
A) 3
B) 4
C) 5
D) 6
✅ Answer:
D) 6
3. Which kingdom does a frog
belong to?
A) Plantae
B) Fungi
C) Animalia
D) Protista
✅ Answer:
C) Animalia
4. Binomial nomenclature
consists of how many names?
A) One
B) Two
C) Three
D) Four
✅ Answer:
B) Two
5. What is the scientific name
of humans?
A) Homo erectus
B) Homo sapiens
C) Pan troglodytes
D) Australopithecus
✅ Answer:
B) Homo sapiens
6. Which of the following is
not a level of classification?
A) Kingdom
B) Class
C) Family
D) Orderly
✅ Answer:
D) Orderly
7. What is the basic unit of
classification?
A) Kingdom
B) Genus
C) Species
D) Order
✅ Answer:
C) Species
8. What kind of symmetry do
most animals have?
A) Radial
B) Bilateral
C) Asymmetrical
D) None
✅ Answer:
B) Bilateral
9. Jellyfish belong to which
phylum?
A) Porifera
B) Arthropoda
C) Cnidaria
D) Mollusca
✅ Answer:
C) Cnidaria
10. Earthworms belong to which
phylum?
A) Annelida
B) Arthropoda
C) Nematoda
D) Mollusca
✅ Answer:
A) Annelida
11. Insects are classified
under which phylum?
A) Arthropoda
B) Annelida
C) Mollusca
D) Platyhelminthes
✅ Answer:
A) Arthropoda
12. Which of the following
animals has an exoskeleton?
A) Frog
B) Human
C) Spider
D) Fish
✅ Answer:
C) Spider
13. Animals with a backbone
belong to which group?
A) Invertebrates
B) Vertebrates
C) Mollusks
D) Arthropods
✅ Answer:
B) Vertebrates
14. Which class of animals can
live both in water and on land?
A) Mammals
B) Amphibians
C) Reptiles
D) Fish
✅ Answer:
B) Amphibians
15. Which class of animals
lays eggs and has feathers?
A) Amphibians
B) Mammals
C) Birds
D) Fish
✅ Answer:
C) Birds
16. Which of the following is
cold-blooded?
A) Lion
B) Dog
C) Snake
D) Whale
✅ Answer:
C) Snake
17. Starfish belongs to which
phylum?
A) Mollusca
B) Echinodermata
C) Arthropoda
D) Annelida
✅ Answer:
B) Echinodermata
18. Sponges are members of
which phylum?
A) Cnidaria
B) Porifera
C) Annelida
D) Mollusca
✅ Answer:
B) Porifera
19. Which of these phyla
includes flatworms?
A) Annelida
B) Platyhelminthes
C) Nematoda
D) Echinodermata
✅ Answer:
B) Platyhelminthes
20. Mollusks usually have:
A) No shells
B) Exoskeleton
C) Soft bodies with shells
D) Jointed legs
✅ Answer:
C) Soft bodies with shells
21. Which of the following is
not a mammal?
A) Dolphin
B) Bat
C) Whale
D) Crocodile
✅ Answer:
D) Crocodile
22. Which animals use gills
for breathing?
A) Mammals
B) Amphibians
C) Fish
D) Reptiles
✅ Answer:
C) Fish
23. What is the scientific
name system called?
A) Biological naming
B) Biochemical nomenclature
C) Binomial nomenclature
D) Animal nomenclature
✅ Answer:
C) Binomial nomenclature
24. Which level comes directly
below kingdom?
A) Order
B) Phylum
C) Class
D) Genus
✅ Answer:
B) Phylum
25. Which of these has radial
symmetry?
A) Human
B) Earthworm
C) Starfish
D) Butterfly
✅ Answer:
C) Starfish
26. Which group is the largest
among invertebrates?
A) Mollusca
B) Arthropoda
C) Annelida
D) Echinodermata
✅ Answer:
B) Arthropoda
27. What is the function of
the notochord?
A) Help in reproduction
B) Provide support
C) Help in respiration
D) Aid in digestion
✅ Answer:
B) Provide support
28. Which vertebrate group has
scaly skin?
A) Birds
B) Mammals
C) Reptiles
D) Amphibians
✅ Answer:
C) Reptiles
29. What does the term
“taxonomy” mean?
A) Study of genes
B) Study of fossils
C) Classification of organisms
D) Study of habitats
✅ Answer:
C) Classification of organisms
30. Which animals show
external fertilization?
A) Reptiles
B) Mammals
C) Birds
D) Amphibians
✅ Answer:
D) Amphibians
31. Which is the correct order
of classification?
A) Kingdom → Species → Genus
B) Kingdom → Class → Phylum
C) Kingdom → Phylum → Class → Order → Family → Genus → Species
D) Class → Phylum → Kingdom
✅ Answer:
C
32. Which is not an
invertebrate?
A) Insect
B) Spider
C) Octopus
D) Frog
✅ Answer:
D) Frog
33. Which system did Carl
Linnaeus develop?
A) Periodic table
B) Photosynthesis
C) Binomial nomenclature
D) Animal migration
✅ Answer:
C) Binomial nomenclature
34. Vertebrates belong to
which phylum?
A) Mollusca
B) Arthropoda
C) Chordata
D) Echinodermata
✅ Answer:
C) Chordata
35. What does “genus” refer
to?
A) One type of species
B) Collection of unrelated species
C) Group of related species
D) A mutation
✅ Answer:
C) Group of related species
36. Which of the following is
a mammal?
A) Penguin
B) Bat
C) Crocodile
D) Shark
✅ Answer:
B) Bat
37. Which is an example of an
arthropod?
A) Octopus
B) Lobster
C) Snake
D) Jellyfish
✅ Answer:
B) Lobster
38. Which class do snakes
belong to?
A) Amphibians
B) Reptiles
C) Fish
D) Mammals
✅ Answer:
B) Reptiles
39. Which feature is exclusive
to mammals?
A) Lay eggs
B) Have gills
C) Produce milk
D) Cold-blooded
✅ Answer:
C) Produce milk
40. What does “cold-blooded”
mean?
A) Body stays warm always
B) Body temperature changes with environment
C) Can’t live in cold areas
D) Has cold blood
✅ Answer:
B) Body temperature changes with environment
কোন মন্তব্য নেই
Thank You