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NEET 2013 Biology Answer Key

NEET 2013 Biology Questions (1-10/11-20/21-30/31-40/41-50/51-60/61-70)
71. A good producer of citric acid is
(1) Psuedomonas
(2) Clostridium
(3) Sacharomyces
(4) Aspergillus
72. The characteristics and an example of a synovial joint in humans is:
Characteristics Examples

(1) Fluid filled between two joints, provides cushion Skull bones

(2) Fluid filled synovial cavity between two bones Joint between atlas and axis
(3) Lymph filled between two bones, limited movement Gliding joint
between carpals
(4) Fluid cartilage between two bones, limited movements Knee joints



73. A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics.
(1) Late
Anaphase
Chromosomes move away
from equatorial plate,
golgi complex not present.

(2) Cytokinesis
cells.
Cell plate formed,
mitochondria distributed
between two daughter

(3) Telophase Endoplasmic reticulum
and nucleolus not
reformed yet.

(4) Telophase Nuclear envelop reforms,
golgi complex reforms.



74. The diagram given here is the standard ECG of a normal person. The P-wave represents the
ECG of a normal person
(1) Initiation of the ventricular contraction
(2) Beginning of the systole
(3) End of systole
(4) Contraction of both the atria
75. Match the name of the animal (Column I) with one characteristics (Column II) and the phylum/class (Column III) to which it belongs.
Column I
Column II
Column III
(1) Ichthyophis Terrestrial Reptilia
(2) Limulus body covered by chitinous exoskeleton Pisces
(3) Adamsia radially
symmetrical
Porifera
(4) Petromyzon Ectoparasite Cyclostomata


76. Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/ deficiency symptom
Endocrine
gland
Hormone Function/ deficiency
symptoms
(1) Posterior
pituitary
Growth Hormone (GH) Oversecretion stimulates abnormal growth
(2)

Thyroid
gland
Thyroxine Thyroxine Lack of iodine in diet results in goitre
(3) Corpus
luteum
Testosterone Stimulates spermatogenesis
(4) Anterior
pituitary
Oxytocin Stimulates uterus contraction
during child birth

77. Which of the following statements is not true of two genes that show 50% recombination frequency ?
(1) The genes are tightly linked
(2) The genes show independent assortment
(3) If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis
(4) The genes may be on different chromosomes
78. Read the following statements (A-E) and answer the question which follows them
(A) In liverworts, mosses, and ferns gametophytes are free-living
(B) Gymnosperms and some ferns are heterosporous
(C) Sexual reproduction in Fucus Volvox and Albugo is oogamous
(D) The sporophyte in liverworts is more elaborate than that in mosses
(E) Both, Pinus and Marchantia are dioecious
How many of the above statements are correct ?
(1) Two (2) Three
(3) Four (4) One
79. How many of the above statements are correct ?
(1) Two
(2) Three
(3) Four
(4) One
79. The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic.
 NEET 2013 questions and answers
(1) B-pleural membrane - surround ribs on both sides to provide cushion against rubbing
(2) C-Alveoli - thin walled vascular bag like structures for exchange of gases
(3) D-Lower end of lungs - diaphragm pulls it down during inspiration
(4) A - trachea - long tube supported by complete cartilaginous rings for conducting inspired air
80.  A diagram showing axon terminal and synapse is given. Identify correctly at least two of A-D
axon terminal and synapse
(1) B - Synaptic connection
D - K+
(2) A - Neurotransmitter
B - Synaptic cleft
(3) C - Neurotransmitter
D - Ca++
(4) A - Receptor
C - Synaptic vesicles
Answers
71. (4)Aspergillus
72. (2) Fluid filled synovial cavity between two bones- Joint between atlas and axis
73. (4) Telophase- Nuclear envelop reforms, golgi complex reforms.
74. (4) Contraction of both the atria
75. (4) Petromyzon- Ectoparasite-Cyclostomata
76. (2) Thyroid gland -Thyroxine - Thyroxine Lack of iodine in  diet results in goitre
77. (1) The genes are tightly linked
78. (2) Three
79. (2) C-Alveoli - thin walled vascular bag like structures for exchange of gases
80. (4) A - Receptor
C - Synaptic vesicles

.

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