Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The parasphenoid bone in frog forms :

  • base of cranium

  • floor of cranium

  • dorsal side of cranium

  • dorsolateral side of cranium


B.

floor of cranium

Parasphenoid bone is a flattened and inverted T-shaped bone which lies in the median line along the floor of cranium.


2.

Body cavity of adult Ascaris is :

  • haemocoel

  • amphicoel

  • pseudocoel

  • schizocoel


C.

pseudocoel

Body cavity of Ascaris is called pseudocoel. It is the space between body wall and the alimentary canal which is not lined by mesoderm.

Haemocoel is the primary body cavity of most invertebrates, containing circulatory fluid.

Amphicoel or amphicoelous consists of both anterior and posterior surfaces of the centrum concave.

Schizocoel is a coelom present in the body cavity lying between the digestive tract and the musculature of the body wall.


3.

Thyroid deficiency in infant leads to :

  • hypothyroidism

  • myxoedema

  • cretinism

  • thyrotoxicosis


C.

cretinism

Cretinism is caused by the deficiency of thyroid hormone in infants. Myxoedema is caused by the deficiency in adults. Graves disease or exophthalmic goitre is caused by the hypersecretion of thyroid hormone.


4.

Which of the following symmetry is found in adult sea-anemone ?

  • Radial

  • Biradial

  • Bilateral

  • Spherical


A.

Radial

Sea anemone is a cylinfrical and radially symmetrical animal measuring about 5 to 7cm. Body is divided into orl disc, peadal disc and column. It is brownish or yellowish in colour.


5.

Glomerular filtrate is

  • blood minus blood corpuscles and plasma protein

  • blood minus corpuscles

  • mixture of water, ammonia and corpuscles

  • urine


A.

blood minus blood corpuscles and plasma protein

The glomerular filtrate contains a large amount of water and other dissolved substances such as urea, uric acid, creatinine, amino acids, glucose, sodium, potassium, vitamins etc. Both glomerular filterate and blood plasma are similar except former does not consists of proteins.


6.

Which of the following is not found in Hydra ?

  • Epithelio-muscular cells

  • Cnidocyte

  • Choanocyte

  • Nerve cells


C.

Choanocyte

Coanocytes are the characteristic cells of sponges not coelenterates.

In Hydra, epitheliomuscular cells, cnidoblasts, interstitial cells, nerve cells, sensory cells, epithelio musculonutritive cells are found.


7.

A condition in which body's internal environment remains relatively constant within limits is called :

  • homeostasis

  • hemostasis

  • hematoma

  • haemopoiesis


A.

homeostasis

Homeostasis is the condition in which body's internal environment remains relatively constant within limits. Homeostatic mechanisms protects an environment from harmful fluctutations. 


8.

Which of the following structure in Pheretima posthuma plays the role of the liver of vertebrates ?

  • Calciferous glands

  • Gland cells

  • Chloragogen cells

  • Cliteller cells


C.

Chloragogen cells

Chloragogen cells of Pheretima posthuma are analogous to liver of vertebrates. They are said to be excretory. They may also store the reserve food material and manufacture glycogen from fatty acids.


9.

Mammalian prolactin is secreted by :

  • adenohypophysis

  • neurohypophysis

  • adrenal cortex

  • adrenal medulla


A.

adenohypophysis

Mammalian prolactin is secreted by adenohypophysis. ACTH or Adrenocorticotrophic hormone is secreted by adenohypophysis or anterior pituitary. 

Oxytocin is secreted by posterior pituitary or neurohypophysis.


10.

Kuhne:

  • discovered parathyroid

  • coined the term enzyme

  • coined the term gene

  • discovered enzyme


B.

coined the term enzyme

The term enzyme was given by W. Kuhne in 1678. J.B. Sumner (1926) purified and crystallised urease enzyme and suggested that enzymes are proteins. J.H. Northrop and M. Kunitz (1930) prepared pure crystalline pepsin and trypsin and showed that these enzymes were also proteins.