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NEET • BIOLOGY • ANIMAL KINGDOM

Animal kingdom practice · Mixed difficulty

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Showing 121-150 of 176 questions

121 Easy

121 of 176

Understanding +4 | -1

Which of the following is true about sponges?

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Correct option: C

Internal fertilization

Option C (Internal fertilization) is correct because sponges reproduce sexually with internal fertilization.

122 Easy

122 of 176

Understanding +4 | -1

Which of the following is not true regarding phylum-Coelenterata?

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Correct option: B

They have cellular level of organisation

Option B (They have cellular level of organisation) is correct because Coelenterata (Cnidaria) have a tissue level of organization, not a cellular level.

123 Hard

123 of 176

Understanding +4 | -1

[A]: Sponges are primitive multicellular animals that probably evolved a multicellular structure independently of other animals.

[R]: Sponges are stationary animals and remain fixed to substratum while water passes over them.

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Correct option: B

Both A and R are true and R is not the correct explanation of A

Option B (Both A and R are true and R is not the correct explanation of A) is correct because both the assertion and reason are true, but the reason doesn't explain why sponges evolved a multicellular structure independently.

124 Easy

124 of 176

Remembering +4 | -1

Unique features of phylum-Ctenophora is

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Correct option: B

Presence of comb plates only

Option B (Presence of comb plates only) is correct because Ctenophora are characterized by the presence of comb plates, which are used for locomotion.

125 Easy

125 of 176

Remembering +4 | -1

Differentiated embryonic layers are called
I. ectoderm II. Endoderm
III. Mesoderm III. Mesoglea

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Correct option: B

I, II and III

Option B (I, II and III) is correct because ectoderm, endoderm, and mesoderm are the three primary germ layers that differentiate during embryonic development.

126 Hard

126 of 176

Understanding +4 | -1

Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?

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Correct option: C

Spongilla has special collar cells called choanocytes, which are not found in the remaining three

Option C (Spongilla has special collar cells called choanocytes, which are not found in the remaining three) is correct because choanocytes are unique to sponges.

127 Hard

127 of 176

Remembering +4 | -1

Water currents in a sponge body are maintained by

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Correct option: B

Choanocytes

Option B (Choanocytes) is correct because choanocytes, with their flagella, create water currents in sponges.

128 Easy

128 of 176

Remembering +4 | -1

Which of the following phyla are schizocoelomates?

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Correct option: B

Annelida, Arthropoda and Mollusca

Option B (Annelida, Arthropoda and Mollusca) is correct because schizocoelomates are animals in which the coelom is formed by splitting of the mesodermal embryonic tissue, and this occurs in Annelida, Arthropoda, and Mollusca.

129 Medium

129 of 176

Understanding +4 | -1

Select the correct option w.r.t. animals and their characteristics.

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Correct option: D

Animals - Aplysia - Radula

Option D is correct because Aplysia (sea hare), a mollusk, possesses a radula, a rasping organ used for feeding.

130 Hard

130 of 176

Remembering +4 | -1

Hydra recognizes its prey by

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Correct option: A

Nematocyst

Option A (Nematocyst) is correct because Hydra uses nematocysts, specialized stinging cells, to recognize and capture its prey.

131 Medium

131 of 176

Remembering +4 | -1

Which of the following is common in Annelida and Arthropoda?

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Correct option: C

Ventral nerve cord

Option C (Ventral nerve cord) is correct because both Annelida and Arthropoda possess a ventral nerve cord.

132 Easy

132 of 176

Remembering +4 | -1

Which of the following shows polymorphism?

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Correct option: A

Physalia

Option A (Physalia) is correct because Physalia, the Portuguese man-of-war, exhibits polymorphism, with different individuals specialized for different functions (feeding, reproduction, defense).

133 Medium

133 of 176

Analyzing +4 | -1

From the organisms given below, select the odd one on the basis of symmetry shown by them

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Correct option: A

Meandrina

Option A (Meandrina) is the odd one out because Meandrina (brain coral) exhibits radial symmetry, while Taenia (tapeworm), Psittacula (parrot), and Limulus (horseshoe crab) exhibit bilateral symmetry.

134 Hard

134 of 176

Understanding +4 | -1

[A]: Protozoans have no physiological division of labour.

[R]: They have a well developed cell tissue and tissue organ system.

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Correct option: C

A is true but R is false

Option C (A is true but R is false) is correct because protozoans lack physiological division of labor, but they do not have well-developed tissue and organ systems.

135 Easy

135 of 176

Analyzing +4 | -1

Among Aedes, Limulus, Pheretima, Ancylostoma, Antedon, how many possess true coelom, segmentation and closed circulatory system?

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Correct option: A

One

Option A (One) is correct. Only Pheretima (earthworm) possesses true coelom, segmentation, and a closed circulatory system among the listed organisms.

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136 Medium

136 of 176

Remembering +4 | -1

Haemocoel is found in

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Correct option: C

Cockroach and Pila

Option C (Cockroach and Pila) is correct because both cockroaches (an arthropod) and Pila (a mollusk) possess an open circulatory system with a haemocoel.

137 Medium

137 of 176

Analyzing +4 | -1

Animal of the same phylum are grouped below. Choose the incorrect group from given below option

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Correct option: D

Earthworm, millipede, leech

Option A (Shark, snake, whale, reptiles) is incorrect because sharks are fish (Chondrichthyes), while snakes and reptiles are reptiles, and whales are mammals.

138 Medium

138 of 176

Understanding +4 | -1

Which of the following statements are true for the phylum-Chordata ?
(a) In Urochordata notochord extends from head to tail and it is present throughout their life.

(b) In Vertebrata notochord is present during the embryonic period only.

(c) Central nervous system is dorsal and hollow.

(d) Chordata is divided into

\mathrm{3}

subphyla: Hemichordata, Tunicata and Cephalochordata.

View answer and explanation

Correct option: D

\left( \mathrm{b} \right)\mathrm{ and }\left( \mathrm{c} \right)

Option D ((b) and (c)) is correct because Vertebrata have a notochord only during the embryonic period, and Chordates have a dorsal and hollow central nervous system.

139 Medium

139 of 176

Understanding +4 | -1

Assertion: Digestion is chiefly extra cellular in ctenophores.

Reason: Ctenophores are diploblastic organisms.

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Correct option: D

Assertion is false but reason is true

Option D is correct because the assertion is false (digestion is both intra and extracellular in ctenophores), but the reason is true (ctenophores are diploblastic).

140 Easy

140 of 176

Remembering +4 | -1

Asymmetrical animals are

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Correct option: D

All of these

Option D (All of these) is correct because Amoeba, Spongilla, and Spongia are all asymmetrical animals, meaning they lack a defined symmetry.

141 Medium

141 of 176

Remembering +4 | -1

Which of the following animals does not undergo metamorphosis ?

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Correct option: B

Earthworm

Option B (Earthworm) is correct because earthworms do not undergo metamorphosis; they develop directly from juvenile to adult form.

142 Hard

142 of 176

Remembering +4 | -1

Nematoblasts are formed by

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Correct option: A

Interstitial cells

Option A (Interstitial cells) is correct because nematoblasts, the precursor cells to cnidocytes, are derived from interstitial cells, which are undifferentiated stem cells in cnidarians.

143 Medium

143 of 176

Understanding +4 | -1

(S-I): The body cavity of Cnidarians is called gastrovascular cavity.

(S-II): The gastrovascular cavity opens with mouth on hypostome.

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Correct option: A

Both statements are true

Option A is correct because both statements are true: Cnidarians have a gastrovascular cavity, and it opens through the mouth on the hypostome.

144 Hard

144 of 176

Remembering +4 | -1

On the basis of organisation, animals are grouped into:

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Correct option: B

Protozoa and metazoa

Option D (Parazoa and metazoa) is correct because animals are broadly grouped into Parazoa (lacking true tissues) and Metazoa (having true tissues).

145 Easy

145 of 176

Understanding +4 | -1

Triploblastic animal differ from diploblstic animal by having

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Correct option: B

Mesoderm

Option B (Mesoderm) is correct because triploblastic animals have three germ layers (ectoderm, mesoderm, and endoderm), while diploblastic animals have only two (ectoderm and endoderm).

146 Medium

146 of 176

Analyzing +4 | -1

Find out the correct Matching?

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Correct option: B

Ascaris, Leech, Earthworm- Eucoelomate Exception – Ascaris

Option B (Ascaris, Leech, Earthworm- Eucoelomate Exception – Ascaris) is the correct match because Ascaris is a pseudocoelomate, while leech and earthworm are eucoelomates.

147 Easy

147 of 176

Remembering +4 | -1

Characteristic of coelenterate is occurrence of

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Correct option: A

Nematocysts

Option A (Nematocysts) is correct because Nematocysts are stinging cells that are a defining characteristic of the phylum Coelenterata (Cnidaria).

148 Easy

148 of 176

Understanding +4 | -1

Identify the incorrect statement.

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Correct option: D

In unicellular organisms, all physiological functions are performed by multiple or group of cells

Option D (In unicellular organisms, all physiological functions are performed by multiple or group of cells) is correct because in unicellular organisms, all physiological functions are performed by a single cell, not multiple or a group of cells.

149 Easy

149 of 176

Understanding +4 | -1

Read the following statements
a) Metagenesis is observed in Helminths.
b) Echinoderms are triploblastic and coelomate animals.
c) Round worms have organ-system level of body organization.
d) Comb plates present in ctenophores help in digestion.
e) Water vascular system is characteristic of Echinoderms.
Choose the correct answer from the options given below.

View answer and explanation

Correct option: B

(b), (c) and (e) are correct

Option B is correct because Echinoderms are triploblastic and coelomate, roundworms have organ-system level organization, and echinoderms possess a water vascular system.

150 Medium

150 of 176

Understanding +4 | -1

S-1: The body cavity of nematodes is a pseudocoel.

S-2: The body cavity of nematodes is lined by mesoderm

View answer and explanation

Correct option: B

Statement-1 is true, statement-2 is false.

Option B (Statement-1 is true, statement-2 is false) is correct because nematodes have a pseudocoelom, but it is not lined by mesoderm.

Revision notes and key takeaways

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