Tag: zoology

Questions Related to zoology

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

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

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

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

Aquatic photodiffraction produces zones, like

  1. Euphotic, disphotic and disaphotic

  2. Aphotic, euphotic and disphotic

  3. Euphotic, aphotic and disphotic

  4. Euphotic, disphotic and aphotic

Correct Option: D

The photic zone or euphotic zone is the depth of the water in a lake or ocean, that is exposed to such intensity of light at which the rate of oxygen consumption, is equal to the rate of carbon dioxide production. It extends from the surface down to a depth where light intensity falls to one percent of that at the surface, called the euphotic depth. About 90% of all marine life lives in the euphotic zone.

The zone which extends from the base of the euphotic zone to about 200 metres is called as the disphotic zone. While there is some light, it is insufficient for photosynthesis. The euphotic zone together with the disphotic zone coincides with the epipelagic zone. The bottommost zone, below the euphotic zone, is called as the aphotic zone. Most deep ocean waters belong to this zone.

Benthos of pond ecosystem are

  1. Producers

  2. Primary consumers

  3. Secondary consumers

  4. Tertiary consumers

Correct Option: B

Benthos are the organisms found at the bottom of freshwater bodies such as lakes, rivers, and streams and since light cannot reach such deep water, therefore, they depend upon organic matter. This dead and decaying matter sustain their food chain hence, they are mostly scavengers or detritivores, belonging to primary consumers of detritus food chain.

So, the correct answer is option B.

Organisms living at the bottom of a lake are

  1. Nekton

  2. Benthos

  3. Plankton

  4. Pelagic

Correct Option: B

Abyssal zone in ocean has

  1. No sunlight but contains consumers and decomposers

  2. No sunlight but contains producers

  3. No sunlight but contains living beings

  4. Sunlight as well as producers

Correct Option: A

Profundal zone is

  1. Aphotic zone in deep water

  2. Euphotic zone in open water

  3. Disphotic zone in deep water

  4. Dark bottom of deep water body

Correct Option: A

Benthoic animals lives 

  1. Deep in sea

  2. Floating

  3. Submerged

  4. Active swimmers

Correct Option: A

Which of the following supports a dense population of plankton and littoral vegetation?

  1. Oligotrophic condition

  2. Eutrophic condition

  3. Lithotrophic condition

  4. Agroecotrophic condition

Correct Option: B

Ponds and lakes are stationary fresh water ecosystems. Ponds are generally shallower with depth less than 2 meters. Shallow lakes are eutrophic with rich biota and quick circulation of nutrients. Producers in a pond or lake ecosystem include phytoplanktons like diatoms, desmids, Chlorella, Chlamydomonas, Spirogyra, Chlamydomonas, Oedogonium etc. Littoral zones occur on the edge of large lakes and rivers, having dense growth of vegetation. Therefore, the correct answer is option B.