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Frog - control and coordination system - class-XI

Description: frog - control and coordination system
Number of Questions: 16
Created by:
Tags: zoology animal diversity - ii (phylum: chordata) organ and organ systems in animals
Attempted 0/16 Correct 0 Score 0

A frog with crushed brain is pinched on the leg. The leg is drawn away. It is

  1. Automatic motor response

  2. Neurotransmitter induced response

  3. Conditional reflex

  4. Simple reflex


Correct Option: D

What is true about buccophayngeal respiration in frog-

  1. Sternohyal muscle contracted-Buccal air pumped into lungs. petrohyal muscle cotractedpulmonary air pumped out.

  2. Sternohyal muscle contracted-atmospheric air sucked in, petrohyal muscle contract-Buccal air pumped out

  3. Sterohyal muscle relaxed-atmospheric air pumped out, petrohyal muscle contracted-Buccal air pumped into lungs

  4. None


Correct Option: A

What happens if ophthalmic branch of trigeminal is cut in frog?

  1. Frog dies

  2. Frog becomes blind

  3. Frog loses its capacity of sensing

  4. None of the above


Correct Option: C

Insufficient production of ______ in the tadpoles leads to the incomplete development.

  1. Thyroid

  2. Thyroxine

  3. Iodine

  4. Larve


Correct Option: B
Explanation:

The process of growth and development is regulated by thyroxine hormone which is produced by thyroid gland. Iodine is required for thyroxine production. Thus insufficient production of thyroxine in the tadpoles leads to the incomplete development.

The number of pairs of cranial nerves arising from the brain of frog is?

  1. $10$

  2. $9$

  3. $8$

  4. $7$


Correct Option: A

Tadpoles growing in ___________ water shows retarded growth.

  1. Iodine deficient

  2. Iodine rich

  3. Magnesium deficient

  4. Magnesium rich


Correct Option: A
Explanation:

The process of growth and development is regulated by thyroxine hormone which is produced by thyroid gland. Iodine is required for thyroxine production. That is why retarded growth is seen in tadpoles living in iodine deficient water. 

For the metamorphosis of tadpoles which of the following element must be available in water?

  1. Chlorine

  2. Carbon

  3. Sulphur

  4. Iodine


Correct Option: D
Explanation:

In an insect or an amphibian, the process of transformation from an immature form to an adult form in two or more distinct stages is known as metamorphosis. For the metamorphosis of tadpoles, thyroid hormone along with the essential constituent iodine is necessary.

Contraction of sternohyal muscles during breathing in frog ____________.

  1. Closes glottis

  2. Opens the nostrils

  3. Raises floor of oral cavity

  4. Lowers floor of oral cavity


Correct Option: D
Explanation:

Throat is lowered and raised alternatively by sternohyal and petrohyal muscles.

Which of the following statement is true with reference to
teeth in frog

  1. The lower jaw is toothless

  2. The upper jaw is toothless

  3. Both lower and upper jaws are toothless

  4. Both lower and upper jaws are toothed


Correct Option: A
Explanation:

The lower jaw of frog is toothless. Teeth are present on premaxillae , maxillae of upper jaw.

One of the examples of the action of the autonomous neural system is ____________.

  1. Swallowing of food

  2. Pupillary reflex

  3. Peristalsis of the intestine

  4. All of these


Correct Option: D
Explanation:

Autonomous neural system controls and coordinates the involuntary activities of various organs. It regulates involuntary activities of the body i.e., activities that are not under the will power of the animal, e.g. swallowing of food, pupillary reflex, peristalsis of the intestine, etc.

Sympathetic neural system induces ________________.

  1. secretion of digestive juices

  2. heart beat

  3. secretion of saliva

  4. all of these.


Correct Option: B
The hind brain in frog consists of
  1. cerebellum

  2. medulla oblongata

  3. diencephalon

  4. Both (a) and (b)


Correct Option: D
Explanation:

The hindbrain in frog consists of the 'cerebellum' and 'medulla oblongata'. So, the correct answer is 'Both (a) and (b)'.

Jacobson's organ is?

  1. Absent in Frog

  2. Absent in humans

  3. Present in humans

  4. Vestigial in humans


Correct Option: A

Identify the wrong statement about frog.

  1. Parathyroid and pineal body are present

  2. There are ten cranial nerves only

  3. Optic lobes are situated in the mid brain

  4. The ventricle opens into the conus arteriosus


Correct Option: A
Explanation:

There are ten pairs of cranial nerves arising from the brain. The brain is enclosed in a bony structure called brain box. The brain is divided into fore-brain mid-brain and hind-brain. Forebrain includes olfactory lobes, paired cerebral hemispheres, and unpaired diencephalon. The midbrain is characterized by a pair of optic lobes. Hind-brain consists of cerebellum and medulla oblongata. The ventricle opens into a sac-like conus arteriosus on the ventral side of heart.

So the correct option is "Parathyroid and pineal body are present".

Following are given four statements (i)- (iv) related to frog. Read the statements carefully and select the option that identifies two correct statements.
(i) The brain is divided into fore-brain, mid-brain and hind-brain
(ii) Vasa efferentia enter the kidneys on their side and open into Bidder's canal.
(iii) Ear acts as a hearing organ only
(iv) RBCs are enucleated and contain red coloured pigment namely haemoglobin.
  1. (ii) and (iii)

  2. (i) and (ii)

  3. (iii) and (iv)

  4. (i) and (iv)


Correct Option: B
Explanation:

Ear acts as a hearing as well as balancing organ. RBCs are nucleated and contain red coloured pigment namely haemoglobin.

Read the statement with regard to frog. Which of the statement is/are correct and incorrect?

(i) The medulla oblongata passes out through foramen of Monro and continues into the spinal cord.
(ii) Vasa efferentia are 10-12 in number that arises from testes
(iii) Ovaries have no functional connection with kidneys
(iv) Frogs are uricotelic
  1. Statements (i), (ii) and (iii) are correct while statement (iv) is incorrect

  2. Statements (ii), (ii) are correct while statement (i) and (iv) is incorrect

  3. Statements (ii), (iii) and (iv) are correct while statement (i) is incorrect

  4. None of these


Correct Option: B
Explanation:

In frog, the medulla oblongata passes out through foramen magnum and continues into spinal cord. Frogs are ureotelic.

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