CBSE Class 9 Biology Diversity in Living Organisms MCQs Set 05

Biology Objective Questions and Answers: Diversity in Living Organisms

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Multiple Choice Questions

Question 1: In Whittaker's system of classification, unicellular eukaryotic organisms are kept under
(a) Monera
(b) Fungi
(c) Protista
(d) Protozoa
Show Answer & Explanation

Answer: (c) Protista

Explanation:
1. Whittaker placed unicellular eukaryotes in Kingdom Protista.
2. Monera is for prokaryotes.
3. Protozoa is not a kingdom.

Teacher's Note:
1. Protista is the kingdom of unicellular eukaryotes.

Question 2: Which of the following is not a criterion for the classification of living organisms?
(a) Body design of the organism
(b) Ability to produce one's own food
(c) Membrane-bound nucleus and cell organelles
(d) Height of the plant
Show Answer & Explanation

Answer: (d) Height of the plant

Explanation:
1. Body design, mode of nutrition and cell structure are used as criteria.
2. The height of a plant varies with age and environment and is not a criterion.

Teacher's Note:
1. Classification uses fundamental characteristics.

Question 3: Which one is not diploblastic?
(a) Sponge
(b) Cnidaria
(c) Nematoda
(d) Ctenophora
Show Answer & Explanation

Answer: (c) Nematoda

Explanation:
1. Sponges, cnidarians and ctenophores are diploblastic.
2. Nematodes are triploblastic.

Teacher's Note:
1. Diploblastic means two germ layers.

Question 4: The lowest category of classification is
(a) Phylum
(b) Genus
(c) Species
(d) Family
Show Answer & Explanation

Answer: (c) Species

Explanation:
1. The hierarchy is Kingdom, Phylum, Class, Order, Family, Genus, Species.
2. Species is the lowest and the basic unit.

Teacher's Note:
1. Species is the basic unit of taxonomy.

Question 5: The mode of nutrition in most fungi is
(a) Autotrophic
(b) Saprophytic
(c) Holozoic
(d) Symbiotic
Show Answer & Explanation

Answer: (b) Saprophytic

Explanation:
1. Fungi lack chlorophyll and absorb nutrients from dead organic matter.
2. This mode is saprophytic.

Teacher's Note:
1. Some fungi are parasites, but most are saprophytes.

Question 6: Metameric segmentation first appeared in
(a) Platyhelminthes
(b) Annelida
(c) Cockroach
(d) Arthropoda
Show Answer & Explanation

Answer: (b) Annelida

Explanation:
1. Annelids are the first animals with a body divided into similar segments (metamerism).

Teacher's Note:
1. Arthropods came later in evolution.

Question 7: The excretory cells of platyhelminthes are
(a) Flame cells
(b) Nephridia
(c) Green glands
(d) Kidneys
Show Answer & Explanation

Answer: (a) Flame cells

Explanation:
1. Flatworms excrete through flame cells (protonephridia).
2. Nephridia belong to annelids and green glands to crustaceans.

Teacher's Note:
1. Flame cells also help in osmoregulation.

Question 8: The four-kingdom system of classification was given by
(a) Copeland
(b) Whittaker
(c) Linnaeus
(d) Von Mohl
Show Answer & Explanation

Answer: (a) Copeland

Explanation:
1. H. F. Copeland proposed four kingdoms in 1966 by adding Monera to the earlier scheme.

Teacher's Note:
1. Whittaker gave the five-kingdom scheme in 1969.

Question 9: Which of the following groups of animals are found in a marine habitat?
1. Some fishes
2. Echinoderms
3. Whale
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1, 2 and 3
(d) 1 only
Show Answer & Explanation

Answer: (c) 1, 2 and 3

Explanation:
1. Many fishes live in the sea.
2. All echinoderms are marine.
3. Whales are marine mammals.
4. So all three are found in marine habitats.

Teacher's Note:
1. Echinoderms never live in fresh water.

Question 10: Palaemon (prawn) is an example of
(a) Arthropoda
(b) Annelida
(c) Coelenterata
(d) Protozoa
Show Answer & Explanation

Answer: (a) Arthropoda

Explanation:
1. Prawns have a chitinous exoskeleton and jointed legs.
2. These are features of phylum Arthropoda.

Teacher's Note:
1. Jointed legs identify arthropods.

Question 11: Pteridophyta do not have
(a) root
(b) stem
(c) flowers
(d) leaves
Show Answer & Explanation

Answer: (c) flowers

Explanation:
1. Pteridophytes have true roots, stems and leaves.
2. They reproduce by spores and produce no flowers or seeds.

Teacher's Note:
1. They are flowerless vascular plants.

Question 12: The excretory organs of annelids are
(a) Protonephridia
(b) Nephridia
(c) Green glands
(d) Kidneys
Show Answer & Explanation

Answer: (b) Nephridia

Explanation:
1. Annelids excrete through coiled tubes called nephridia, one pair per segment.
2. Green glands belong to crustaceans.

Teacher's Note:
1. Earthworm has nephridia.

Question 13: The five-kingdom classification was given by
(a) Morgan
(b) R. Whittaker
(c) Linnaeus
(d) Haeckel
Show Answer & Explanation

Answer: (b) R. Whittaker

Explanation:
1. R. H. Whittaker proposed five kingdoms in 1969: Monera, Protista, Fungi, Plantae and Animalia.

Teacher's Note:
1. Haeckel proposed three kingdoms.

Question 14: Match Column I with Column II and choose the correct combination.
Column I: (i) Flame cells, (ii) Collar cells, (iii) Stinging cells
Column II: (p) Sponges, (q) Hydra, (r) Planaria, (s) Ascaris
(a) i = r, ii = p, iii = q
(b) i = r, ii = p, iii = s
(c) i = r, ii = s, iii = p
(d) i = p, ii = r, iii = q
Show Answer & Explanation

Answer: (a) i = r, ii = p, iii = q

Explanation:
1. Flame cells are excretory cells of Planaria (r).
2. Collar cells (choanocytes) occur in sponges (p).
3. Stinging cells occur in Hydra (q).
4. So i = r, ii = p, iii = q.

Teacher's Note:
1. Match each cell with the organism that has it.

Question 15: The 'Origin of Species' was written by
(a) Linnaeus
(b) Darwin
(c) Haeckel
(d) Whittaker
Show Answer & Explanation

Answer: (b) Darwin

Explanation:
1. Charles Darwin published On the Origin of Species in 1859.

Teacher's Note:
1. Darwin is linked with evolution.

Question 16: The following vertebrate respires through the skin:
(a) Fish
(b) Frog
(c) Crocodile
(d) Whale
Show Answer & Explanation

Answer: (b) Frog

Explanation:
1. Frogs have a moist skin that helps in gas exchange along with lungs.

Teacher's Note:
1. Amphibian skin acts as a respiratory surface.

Question 17: Bacteria are placed under the kingdom
(a) Protista
(b) Fungi
(c) Monera
(d) Plantae
Show Answer & Explanation

Answer: (c) Monera

Explanation:
1. Bacteria are prokaryotes.
2. Prokaryotes are placed in Kingdom Monera.

Teacher's Note:
1. Monera includes bacteria and blue-green algae.

Question 18: The tube-within-a-tube plan is shown by
(a) Coelenterates
(b) Flatworms
(c) Round worms
(d) Sponges
Show Answer & Explanation

Answer: (c) Round worms

Explanation:
1. Round worms have a complete alimentary canal with a mouth and an anus.
2. This forms a tube inside the body tube.

Teacher's Note:
1. Flatworms have only one opening.

Question 19: Organisms without a nucleus and cell organelles belong to
(i) fungi (ii) protista (iii) cyanobacteria (iv) archaebacteria
(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iv)
(d) (ii) and (iii)
Show Answer & Explanation

Answer: (b) (iii) and (iv)

Explanation:
1. Cyanobacteria and archaebacteria are prokaryotes.
2. Fungi and protists are eukaryotes with a nucleus and organelles.

Teacher's Note:
1. Prokaryotes belong to Kingdom Monera.

Question 20: To which group of animals are nematocysts unique?
(a) Cnidaria
(b) Porifera
(c) Platyhelminthes
(d) Annelida
Show Answer & Explanation

Answer: (a) Cnidaria

Explanation:
1. Nematocysts are stinging organelles in the cnidoblasts of Hydra, jellyfish and sea anemones.

Teacher's Note:
1. Stinging cells are a mark of Cnidaria.

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