Nervous System in Other Animals

Q. What is the difference between nerve net, nerve ring and nerve cord?

Q. In which animal, nerve cell is present but brain is absent?

1. Sponge
2. Earthworm
3. Hydra
4. Cockroach

Q. Which among the following options hold true for the nervous system of chordates?

1. A brain is present, fused ganglia, ventral nerve cord
2. A brain is present, dorsal nerve cord, highly developed receptors
3. No brain, fused ganglia, tympanic membrane
   
4. No brain, nerve net, modified neurons

Q. don't have a specialised area of cells or tissues for control and coordination.

1. Sponges
2. Annelids
3. Cnidarians
4. Ctenophora

Q. Fill in the blanks with appropriate examples.
I. ____A___ are also called as nematocytes.
II. ____B___ is seen in Physalia.
III. Meandrina is also known as ____C___.
IV. ____D____ is found in Aurelia.

Here A to D refers to:

1. A-Cnidoblasts, B-Cellular level of organisation, C-Sea fan, D-Bilateral symmetry
2. A-Nematocytes, B-Tissue level, C-Sea pan, D-Radial symmetry
3. A-Stinging, B-Cellular level of organisation, C-Sea-cucumber, D-Bilateral symmetry
4. A-Cnidocytes, B-Tissue level of organisation, C-Brain coral, D-Radial symmetry

Q. Read the given statements and select the incorrect one.

1. In Hydra, all neurons are similar and join to form a nerve net.
2. In Earthworms, the nervous system consists of a dorsal nerve cord, paired ganglia, and segmental nerves.
3. Brain is present in insects
4. Planaria has two nerve cords that join to form rudimentary brain

Q. Read the following statements and choose the incorrect one.

1. Vestibular apparatus is responsible for maintenance of balance of body and posture.
2. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye.
3. Light includes dissociation of retinal from opsin resulting in changes in the structure of opsin.
4. Nociceptors do not produce graded potentials and respond to changes in pressure.

Q. The smallest cnidoblast in the body of Hydra is

1. Penetrant
2. Volvent
3. Holotrichous isorhiza
4. Atrichous isorhiza

Q. Which of the following organisms have a nerve cell?

1. Both A and B
2. A cockroach
3. A mushroom
4. A rabbit

Q.

_____________ are made up of a collection of cells that function independently without any coordination with each other.

1. Protozoans

2. Cnidarians

3. Annelids

4. Sponges

Q. Fill in the blanks with appropriate examples.
I. ____A___ are also called as nematocytes.
II. ____B___ is seen in Physalia.
III. Meandrina is also known as ____C___.
IV. ____D____ is found in Aurelia.

Here A to D refers to:

1. A-Cnidoblasts, B-Cellular level of organisation, C-Sea fan, D-Bilateral symmetry
2. A-Nematocytes, B-Tissue level, C-Sea pan, D-Radial symmetry
3. A-Stinging, B-Cellular level of organisation, C-Sea-cucumber, D-Bilateral symmetry
4. A-Cnidocytes, B-Tissue level of organisation, C-Brain coral, D-Radial symmetry

Q.

1. Nervous system is basically represented by ganglia arranged on ventral nerve cord
2. In 3rd and 4th segment, the nerve cord bifurcates and joins the cerebral ganglia dorsally to form a nerve ring.
3. The cerebral ganglia along with other nerves in the ring integrate sensory input as well as command muscular responses of the body
4. None of these

Q.

1. Radial spokes
2. Central sheath
3. Singlet microtubules
4. Dynein

Q. Adrenal medulla and membranous labyrinth develop from.

1. Ectoderm
2. Endoderm
3. Mesoderm
4. Both B and C

Q. Which is absent in ctenophores?

1. Epidermis
2. Intercellular and intracellular digestion
3. Cnidoblasts
4. Medusa phase.

Q. The forebrain of a frog consists of

1. unpaired diencephalon
2. optic lobes
3. foramen magnum
4. medulla oblongata

Q. Identify the organism that contains nerve cell.

1. Yeast
2. Spirogyra
3. Earthworm
4. Amoeba

Q. Which of the following processes occur only in animals?

1. Hormonal control
2. Nervous control
3. Respiration
4. Nutrition

Q. In which animal nerve cell is present but brain is absent : -

1. Hydra
2. Sponge
3. Cockroach
4. Earthworm

Q. In earthworm, neurons are

1. Sensory
2. Motor
3. None of these
4. Mixed

Q. 'Kolliker's pit' of protochordates is regarded as organ of

1. Smell
2. Sight
3. None of the above
4. Taste

Q. Which nematoblasts coil around the prey?

1. Penetrants
2. Volvents
3. Small glutinants
4. Large glutinants

Q. don't have a specialised area of cells or tissues for control and coordination.

1. Sponges
2. Annelids
3. Cnidarians
4. Ctenophora