Questions Related to zoology
Identify the wrong statement about frog.
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.
(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.
Ear acts as a hearing as well as balancing organ. RBCs are nucleated and contain red coloured pigment namely haemoglobin.
(ii) Vasa efferentia are 10-12 in number that arises from testes
(iii) Ovaries have no functional connection with kidneys
(iv) Frogs are uricotelic
In frog, the medulla oblongata passes out through foramen magnum and continues into spinal cord. Frogs are ureotelic.
Aquatic photodiffraction produces zones, like
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.
Benthos of pond ecosystem are
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.
Organisms living at the bottom of a lake are
Abyssal zone in ocean has
Profundal zone is
Benthoic animals lives
Which of the following supports a dense population of plankton and littoral vegetation?
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.