CSS Zoology Questions & Answers - Set 54

1)   Hydra is:

a. Marine, diploblastic and radially symmetrical
b. Fresh water, diploblastic and radially symmetrical
c. Marine, riploblastic and bilaterally symmetrical
d. Fresh water, triploblastic and radially
Answer  Explanation 

ANSWER: Fresh water, diploblastic and radially symmetrical

Explanation:
No explanation is available for this question!


2)   Tentacles of Hydra help in:

a. Food capture
b. Locomotion
c. Both (a) & (b)
d. None of these
Answer  Explanation 

ANSWER: Both (a) & (b)

Explanation:
No explanation is available for this question!


3)   Tentacles of Hydra are:

a. Hollow
b. Solid
c. Branched
d. Irregularly arranged
Answer  Explanation 

ANSWER: Hollow

Explanation:
No explanation is available for this question!


4)   Hydra has no special structures for:

a. Attachment
b. Food capture
c. Respiration
d. Offence and defence
Answer  Explanation 

ANSWER: Offence and defence

Explanation:
No explanation is available for this question!


5)   Often hydra is seen moving upon its tentacles, using them as legs. This is called:

a. Somersaulting
b. Gliding
c. Looping
d. Walking
Answer  Explanation 

ANSWER: Looping

Explanation:
No explanation is available for this question!


6)   Hydra can suddenly contract its body with the help of:

a. Interstitial cells
b. Epitheliomuscular cells
c. Tentacles
d. Nematoblasts
Answer  Explanation 

ANSWER: Epitheliomuscular cells

Explanation:
No explanation is available for this question!


7)   Mesogloea is secreted in Hydra by:

a. Epidermis
b. Gastrodermis
c. Both (a) & (b)
d. None of these
Answer  Explanation 

ANSWER: Both (a) & (b)

Explanation:
No explanation is available for this question!


8)   Body wall of Hydra is formed from:

a. Extoderm and mesoderm
b. Ectoderm and endoderm
c. Endoderm and mesoderm
d. Ectoderm, endoderm and mesogloea
Answer  Explanation 

ANSWER: Ectoderm and endoderm

Explanation:
No explanation is available for this question!


9)   Which of these animals respires despite having no respiratory pigment:

a. Earthworm
b. Cockroach
c. Frog
d. Hydra
Answer  Explanation 

ANSWER: Hydra

Explanation:
No explanation is available for this question!


10)   Which of these in Hydra will be most hindered if there were no nematocyst:

a. Ingestion
b. Food capture
c. Locomotion
d. Digestion
Answer  Explanation 

ANSWER: Food capture

Explanation:
No explanation is available for this question!


11)   Which of these has no skeleton whatsoever:

a. Butterfly
b. Sponge
c. Star-fish
d. Jelly-fish
Answer  Explanation 

ANSWER: Jelly-fish

Explanation:
No explanation is available for this question!


12)   Hydra reduces its body by contraction:

a. Epidermals ribres
b. Gastrodermis
c. Interstitial cells
d. None of these
Answer  Explanation 

ANSWER: Epidermals ribres

Explanation:
No explanation is available for this question!


13)   Cells of Hydra possessing flagella and pseudopodia are:

a. Nematocysts
b. Secretory cells
c. Epitheliomuscular cells
d. None of these
Answer  Explanation 

ANSWER: Epitheliomuscular cells

Explanation:
No explanation is available for this question!


14)   Hydra possesses:

a. Sensory cells but no nerve cells
b. Both sensory and nerve cells
c. Neither sensory nor nerve cells
d. Nerve cells but no sensory cells
Answer  Explanation 

ANSWER: Both sensory and nerve cells

Explanation:
No explanation is available for this question!


15)   Gastrovascular cavity is known to occur in which of these:

a. Scypha
b. Hydra
c. Leucosolenia
d. None of these
Answer  Explanation 

ANSWER: Hydra

Explanation:
No explanation is available for this question!


16)   Hydra egests undigested food residues through:

a. Aboral pore
b. Mouth
c. Both (a) & (b)
d. None of these
Answer  Explanation 

ANSWER: Mouth

Explanation:
No explanation is available for this question!


17)   Most favourable food for Hydra is:

a. Water-fleas
b. Bacteria
c. Fishes
d. Frog tadpoles
Answer  Explanation 

ANSWER: Water-fleas

Explanation:
No explanation is available for this question!


18)   Largest nematocysts of Hydra are:

a. Penetrant
b. Volvent
c. Holotrichous isorhizas
d. None of these
Answer  Explanation 

ANSWER: Penetrant

Explanation:
No explanation is available for this question!


19)   Nervous system of Hydra is made up of:

a. Pelarized nerve cells
b. Non-polar nerve cells
c. Ganglionated nerve cords
d. Well defined nerves
Answer  Explanation 

ANSWER: Non-polar nerve cells

Explanation:
No explanation is available for this question!


20)   Pentrant, volvent and glutinants are various kinds of:

a. Mouth parts of mosquito
b. Laraval stages of Ascaris
c. Nematocysts of Hydra
d. None of these
Answer  Explanation 

ANSWER: Nematocysts of Hydra

Explanation:
No explanation is available for this question!


21)   Which of these does not occur in Hydra:

a. Regeneration
b. Segmentation
c. Fertilization
d. Mating
Answer  Explanation 

ANSWER: Mating

Explanation:
No explanation is available for this question!


22)   Hydra respires with the help of:

a. Tentacles
b. Body surface
c. Namatocysts
d. Coelenteron
Answer  Explanation 

ANSWER: Body surface

Explanation:
No explanation is available for this question!


23)   Which of these is found in Hydra:

a. Metabolism
b. Metamerism
c. Metamorphosis
d. Sexual dimorphism
Answer  Explanation 

ANSWER: Metabolism

Explanation:
No explanation is available for this question!


24)   An association mutually beneficial to both partners is represented by:

a. Men and honey bee
b. Zoochlorellae and Hydra
c. Hydra and water fleas
d. Farmer and earthworm
Answer  Explanation 

ANSWER: Zoochlorellae and Hydra

Explanation:
No explanation is available for this question!


25)   Division of labour in multicellular animals means:

a. All functions by a single cell
b. A single function performed by various cells jointly
c. Different functions by different cell types
d. Similar functions by different types of cells
Answer  Explanation 

ANSWER: Different functions by different cell types

Explanation:
No explanation is available for this question!


26)   A single mature Hydra may bear:

a. One ovary and one testis
b. Many ovaries and testes
c. Many ovaries and one testis
d. One ovary and many testes
Answer  Explanation 

ANSWER: One ovary and many testes

Explanation:
No explanation is available for this question!


27)   Zoochlorellae lives inside the Hydra as:

a. Parasite
b. Symbiont
c. Predator
d. Commensal
Answer  Explanation 

ANSWER: Symbiont

Explanation:
No explanation is available for this question!


28)   Digestion in cnidarians is:

a. Extracelular
b. Intracellular
c. Both (a) & (b)
d. None of these
Answer  Explanation 

ANSWER: Both (a) & (b)

Explanation:
No explanation is available for this question!


29)   Zoochlorellae provides to Hydra:

a. Maltose
b. Fat
c. Proteins
d. None of these
Answer  Explanation 

ANSWER: Maltose

Explanation:
No explanation is available for this question!


30)   Hydra feeds upon:

a. Fishes
b. Small crustaceans
c. Aglae
d. Crabs
Answer  Explanation 

ANSWER: Small crustaceans

Explanation:
No explanation is available for this question!


31)   Intracellular digestion is Hydra takes place in:

a. Acidic medium
b. Alkaline medium
c. Neutral medium
d. First acidic and then alkaline medium
Answer  Explanation 

ANSWER: First acidic and then alkaline medium

Explanation:
No explanation is available for this question!


32)   Hydra shows positive responses as well as negative responses, in dim and bright light it shows:

a. Negative responses to both
b. Positive response to both
c. Positive response to weak light and negative to bright one
d. Negative response to weak light and positive response to bright light
Answer  Explanation 

ANSWER: Positive response to weak light and negative to bright one

Explanation:
No explanation is available for this question!


33)   In Hydra the reporduction is:

a. Sexual
b. Asexual
c. Both esexual and sexual
d. None of these
Answer  Explanation 

ANSWER: Both esexual and sexual

Explanation:
No explanation is available for this question!


34)   In Hydra eggs and sperms are formed from:

a. Cnicloblasts
b. Interstitial cells
c. Epitheliomuscular cells
d. None of these
Answer  Explanation 

ANSWER: Interstitial cells

Explanation:
No explanation is available for this question!


35)   Egg of Hydra is:

a. Naked
b. Covered by chitinous shell
c. Covered by perisrac
d. None of these
Answer  Explanation 

ANSWER: Covered by chitinous shell

Explanation:
No explanation is available for this question!


36)   Larva of Hydra is called:

a. Planula
b. Amphiblastula
c. Scyphistoma
d. Miracidium
Answer  Explanation 

ANSWER: Planula

Explanation:
No explanation is available for this question!


37)   Hydra reproduces asexually by budding when:

a. It is alone
b. Plenty of food is available in the pond
c. Environmental conditions are unfavourable
d. Populations of Hydra increases
Answer  Explanation 

ANSWER: Plenty of food is available in the pond

Explanation:
No explanation is available for this question!


38)   In the development of Hydra the gastrulation is the result of:

a. Emboly
b. Delamination
c. Invagination
d. Epiboly
Answer  Explanation 

ANSWER: Delamination

Explanation:
No explanation is available for this question!


39)   Gonads develop in Hydra from:

a. Epithelimuscular cells
b. Interstitial cells
c. Gland cells
d. Nematocysts
Answer  Explanation 

ANSWER: Interstitial cells

Explanation:
No explanation is available for this question!


40)   The cells in Hydra which can transform into all other types of cells are:

a. Gland cells
b. Nutritive muscular cells
c. Interstitial cells
d. None of these
Answer  Explanation 

ANSWER: Interstitial cells

Explanation:
No explanation is available for this question!


41)   Sexual reproduction in Hydra occurs during:

a. Hot months
b. Winter months
c. Both (a) & (b)
d. None of these
Answer  Explanation 

ANSWER: Winter months

Explanation:
No explanation is available for this question!


42)   Budding in Hydra occurs during:

a. Warm months
b. Winter months
c. Both (a) & (b)
d. None of these
Answer  Explanation 

ANSWER: Warm months

Explanation:
No explanation is available for this question!


43)   Anterior end of Hydra with mouth is called:

a. Hytpostoma
b. Pedal disc
c. Both (a) & (b)
d. None of these
Answer  Explanation 

ANSWER: Hytpostoma

Explanation:
No explanation is available for this question!


44)   Nematocyst is stimulated to discharge by:

a. Cnidocil
b. Lesso
c. Fibres of capsule
d. None of these
Answer  Explanation 

ANSWER: Cnidocil

Explanation:
No explanation is available for this question!


45)   Which of these are not found in Hydra:

a. Spirocyst
b. Desmonemes
c. Glutinants
d. Stenotele
Answer  Explanation 

ANSWER: Spirocyst

Explanation:
No explanation is available for this question!


46)   Tosin is produced by:

a. Penetrant
b. Desmonems
c. Glutinants
d. Volvents
Answer  Explanation 

ANSWER: Penetrant

Explanation:
No explanation is available for this question!


47)   Symbiotic algae is found in which of these cells of hydra:

a. Gastrodermal cells
b. Epitheliomuscular cells
c. Mesogloea
d. Interstitial cells
Answer  Explanation 

ANSWER: Gastrodermal cells

Explanation:
No explanation is available for this question!


48)   Mucus is secreted in Hydra by:

a. Interstitial cells
b. Mucus gland cells
c. Enzyme cells
d. Epitheliomuscular cells
Answer  Explanation 

ANSWER: Mucus gland cells

Explanation:
No explanation is available for this question!


49)   Atrichous isorhizas are with:

a. Spiny base
b. Spine on whole tube
c. No spines
d. Spines on butt
Answer  Explanation 

ANSWER: No spines

Explanation:
No explanation is available for this question!


50)   Stenosteles of Hydra have:

a. Spines on the butt
b. No spines
c. Spines on the whole thread
d. None of these
Answer  Explanation 

ANSWER: Spines on the whole thread

Explanation:
No explanation is available for this question!


51)   Response of Hydra to light is:

a. Photonegative
b. Photopositive
c. Some photopositive some negative
d. None of these
Answer  Explanation 

ANSWER: Some photopositive some negative

Explanation:
No explanation is available for this question!


52)   Colony of Obelia is:

a. Free floating
b. Fixed
c. Swimming
d. None of these
Answer  Explanation 

ANSWER: Fixed

Explanation:
No explanation is available for this question!


53)   Colony of Obellia is:

a. Monomorphic
b. Dimorphic
c. Trimorphic
d. None of these
Answer  Explanation 

ANSWER: Trimorphic

Explanation:
No explanation is available for this question!


54)   Hydranths in Obelia colony are:

a. Feeding zooids
b. Sensory zooids
c. Reproductive zooids
d. None of these
Answer  Explanation 

ANSWER: Feeding zooids

Explanation:
No explanation is available for this question!


55)   Obelia colony has:

a. Gastrozooids
b. Blastostyles
c. Both (a) & (b)
d. None of these
Answer  Explanation 

ANSWER: Both (a) & (b)

Explanation:
No explanation is available for this question!


56)   Medusae are formed by:

a. Gastrozooids through asexual reproduction
b. Blastostyles through asexual reproduction
c. Both through sexual reproduction
d. None of these processes
Answer  Explanation 

ANSWER: Blastostyles through asexual reproduction

Explanation:
No explanation is available for this question!


57)   Medusa of Obelia is:

a. Free swimming
b. Fixed and non-mobile
c. Floating
d. None of these
Answer  Explanation 

ANSWER: Free swimming

Explanation:
No explanation is available for this question!


58)   Tentacles in Obelia polyp are:

a. Hollow
b. Solid
c. Irregular
d. None of these
Answer  Explanation 

ANSWER: Solid

Explanation:
No explanation is available for this question!


59)   Polymorphism is found in:

a. Hydra
b. Physailia
c. Aurelia
d. All of these
Answer  Explanation 

ANSWER: Physailia

Explanation:
No explanation is available for this question!


60)   Which of these does not exhibit polymorphsim:

a. Hydra
b. Jelly fish
c. Metridium
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!