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Biology (Medical Entrance)

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Among the formed elements the smallest elements of the blood are the

  1. RBC's

  2. WBC's

  3. Platelets

  4. plasma


Correct Option: C
Explanation:

Platelets are the smallest of the formed elements of the blood.

In man, digestion of carbohydrates begins from the

  1. small intestine

  2. stomach

  3. colon

  4. mouth


Correct Option: D
Explanation:

Digestion of carbohydrates begins from the mouth and ends in small intestine.

Fatty covering myelin sheaths are found

  1. surrounding the tendons

  2. covering the muscles

  3. around axone of neurons

  4. covering the brain


Correct Option: C
Explanation:

Myelin sheaths are found around the axone of some  neurones.

Which of the following sperms does not travel through human reproductive system?

  1. Vas deferens

  2. Ureter

  3. Urethra

  4. Epididymis


Correct Option: B
Explanation:

Ureter is a part of excretory system it carries urine from the kidney to the bladder.

Synapsis and crossing over of chromosome occurs in which phase of meiosis?

  1. Interphase

  2. Metaphase

  3. Teleophase

  4. Prophase


Correct Option: D
Explanation:

Synapsis takes place during the zygotene stage of prophase one of meosis.

Select the hormone incorrectly paired with its target.

  1. TSH - thyroid gland

  2. LH - ovary or testis

  3. MSH - melanocytes

  4. ACTH - anterior pituitary


Correct Option: D
Explanation:

The target of ACTH is adrenal cortex.

Once the erythrocytes enter the blood in humans. They have an average lifetime of

  1. 120 days

  2. 360 days

  3. 10 days

  4. 200 days


Correct Option: A
Explanation:

The typical life span of a normal red blood cell is approximately 120 days.

Which of the following is not a mode of genetic exchange within a bacterial population?

  1. Transformation

  2. Translation

  3. Transduction

  4. Conjugation


Correct Option: B
Explanation:

Translation is the other term for  protein synthesis.

Which type of muscle cells are multinucleated?

  1. Skeletal

  2. Smooth

  3. Cardiac

  4. Visceral muscle


Correct Option: A
Explanation:

Skeletal muscle cells are multinucleated.

The hardest part in the human body is the

  1. ossein

  2. chondrin

  3. dentine

  4. enamel


Correct Option: D
Explanation:

Enamel is the hardest part in human body.

Which of the following represents the dental formula in an adult man?

  1. 1123/1123

  2. 2123/2123

  3. 2033/1023

  4. 2231/2232


Correct Option: B
Explanation:

The dental formula of an adult human is i 2/2 c1/1 pm 2/2 m3/3

Aristotle's lantern is

  1. a mouth of sand dollar consisting of three teeth arranged in a ring

  2. a mouth of oyster consisting of five teeth

  3. a mouth of sand dollar consisting of five teeth arranged in a ring

  4. a mouth of oyster consisting of light emitting organ


Correct Option: C
Explanation:

 Sand dollar is an echinoderm having a typical mouth with five teeth arranged in a ring referred to as Aristotle's lantern.

To which class of phylum mollusca does the octopus belong?

  1. Gastropoda

  2. Cephalopoda

  3. Monoplacophora

  4. Bivalvia


Correct Option: B
Explanation:

 Cephalopoda  is characterised by bilateral symmetry and presence of arms or tentacles which are seen in an octopus.

Which of the following are the characteristics of cuticle of annelids?

  1. The presence of chitin and moulting.

  2. The presence of collagen and moulting.

  3. The presence of chitin with no moulting.

  4. The presence of collagen with no moulting.


Correct Option: D
Explanation:

 Annelid cuticle is characterised by collagen makeup and no moulting occurs.

Largest phylum of marine animals not having terrestrial or fresh water representatives is

  1. Arthropoda

  2. Porifera

  3. Mollusca

  4. Echinodermata


Correct Option: D
Explanation:

 Echinodermata is the largest marine phylum having no freshwater or terrestrial members.

Portuguese man-of-war is

  1. a colonial organism of phylum Echinodermata

  2. a true jellyfish from phylum Cnidaria

  3. a colonial organism of phylum Cnidaria

  4. it is a man eating octopus of phylum Mollusca


Correct Option: C
Explanation:

 Portuguese man-of-war belongs to phylum Cnidaria and is a colony of minute individuals called zooids.

Cysticercosis is caused by

  1. Ancylostoma duodenale

  2. Enterobius vermicularis

  3. Taenia solium

  4. Ascaris lumbricoides


Correct Option: C
Explanation:

 Taenia solium is the tapeworm which causes cysticercosis,a pork infection.

Which of the following phylums of the animal kingdom lacks a body cavity?

  1. Platyhelminthes

  2. Annelida

  3. Nematode

  4. Arthropoda


Correct Option: A
Explanation:

 Flatworms or platyhelminthes members do not have a body cavity and they fall under acoelomates.

Which of the following is not true about cartilaginous fish?

  1. They have no ribs.

  2. They do not have bone marrow.

  3. They have three-chambered heart.

  4. Their skin is covered with dermal teeth.


Correct Option: C
Explanation:

 All fishes have two-chambered heart.

Which of the following does not belong to class Anthozoa of phylum Cnidaria?

  1. Sea anemones.

  2. Jellyfish.

  3. Sea pens.

  4. Corals.


Correct Option: B
Explanation:

 Jellyfish belongs to class Scyphozoa.

The venomous cell which helps Cnidarians in defence and catching prey is called

  1. Nematocyst

  2. Pneumatocyst

  3. Cnidocyst

  4. Nematocyte


Correct Option: D
Explanation:

 Nematocyte is a cell unique to animals belonging to Cnidaria used for prey catching and for other purposes.

Mesoglea in Hydra is

  1. a non living substance that is filled between two epidermal layers

  2. a living substance between two layers of Hydra

  3. a specialised cell aiding in locomotion

  4. a bactericide recently discovered in Hydra


Correct Option: A
Explanation:

Mesoglea is a gel like substance seperating the two body layers of Hydra.

Which of the following is true about birds?

  1. They have three-chambered heart.

  2. They are the least diverse tetrapod vertebrates.

  3. They excrete urea and ammonia as excretory products.

  4. They have a strong beak but no teeth.


Correct Option: D
Explanation:

 Birds lack teeth and the beak performs grinding of food into smaller particles.

To which class do cartilaginous fish belong?

  1. Osteichthyes

  2. Placodermis

  3. Chondrichthyes

  4. Agnatha


Correct Option: C
Explanation:

 Chondrichthyes include cartilaginous fish.

Placoid scales are typical to

  1. sharks and ray fishes

  2. Labeo rohita

  3. Coelacanth and lung fish

  4. Paddlefishes and Bichirs


Correct Option: A
Explanation:

 Placoid scales are found in cartilaginous fish like sharks and rays.

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