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WorksheetsBiology 2nd Half Test
Total questions: 40
Worksheet time: 1hrs 20mins
Which one of the following statements best describes the function of sino atrial node?
It sends out electrical impulses to atrial muscles causing both atria to contract
It consists of small number of diffusely oriented cardiac fibers
It sends out electrical impulses to ventricular muscles causing both ventricles to contract
It is present at upper end of left atrium
The heart beat cycle starts when electrical impulses are generated from?
AV node
SV node
SA node
PQ node
One complete heart beat consists of one systole and one diastole and lasts for about?
0.8 sec
0.4 sec
0.2 sec
0.5 sec
The flaps of tricuspid valves are attached to muscular extensions of right ventricle known as?
Smooth muscles
Papillary muscles
Inter costal muscles
Skeletal muscles
Right atrium is separated from right ventricle by?
Bicuspid valve
Semilunar valves
Tricuspid valve
Interatrial septum
Diastolic blood pressure is?
120mmHg
80mmHg
Mid point of both these values
None of these
Which of the following condition will reduce the flow of blood?
Vasodilation
Vasoconstriction
Vasoconstant
None of these will reduce blood flow
Sertoli cells are found in?
Pancreas and secrete cholecystokinin
Ovaries and secrete progesterone
Adrenal cortex and secrete adrenalin
Seminiferous tubules and provide nutrition to germ cells
Which of the following is just unpaired?
Testes
Prostate
Bulbo urethral gland
Cowpers gland
What is the location of interstitial cells in testes?
Inside the seminiferous tubules
Between the seminiferous tubules
Among the germinal epithelial cells
Around the testes
Spermatogonia differentiates directly into?
Primary spermatocyte
Sperm
Secondary spermatocyte
Spermatid
Sperms move by their?
Tail
Cilia
Acrosome
Mitochondria
Which cell inclusion of the spermatids form the acrosome of the sperm?
Golgi body
Nucleus
Centriole
Mitochondria
Seminiferous tubules open into?
Epididymis
Urinary bladder
Vas deference
Urethra
Defficiency of dopamine result in
Epilepsy
Parkinson’s disease
Paralysis
Alzheimer’s disease
In epilepsy there is excessive electric discharge in
white matter
brain
grey matter
ANS
Onset of Alzheimer’s disease can caused by high level of
Ca
Cr
Al
K
Onset of epilepsy is usually before age of
40
50
30
45
The origin of sympathetic nervous system is from?
Brain
Upper part of spinal cord
Middle part of spinal cord
Lower part of spinal cord
Which one is not related to parasympathetic nervous system?
Contraction of pupils
Decrease in heart beat
Decrease in rate of respiration
Inhibition of digestion
The normal speed of nerve impulse in human is?
80m/s
100m/s
120m/s
140m/s
Non cytoplasmic connection between two consecutive neurons is?
Myloma
Sarcolemma
synapse
none of these
Neurotransmitters are released from
Post synaptic membrane
Pre synaptic membrane
neuroglia
schwan cells
What is synaptic cleft?
Space between axon and dendrite of same neuron
Space between axon and dendrite of different neurons
It is a cytoplasmic connection between between axon and dendrite of same neuron
It is a cytoplasmic connection between between axon and dendrite of different neuron
Total number of muscles
600
640
610
650
All the genes found in a breeding population at a given time are collectively termed as:
Gene frequency
Gene Linkage
Gene pool
Gene cluster
Mendel proposed that each contrasting form a trait was determined by:
Gene
Elementen
Alleles
Transposons
If a trait becomes recessive in F1, then it will express in F2 only when:
Alleles expresses co-dominantly
Alleles expresses via incomplete dominance
Homozygous recessive condition
Homozygous dominant condition
Which of the following best describe the ‘term’ that is related to an allele that always expresses:
Recessive
Dominant
Co-dominant
All except ‘A’
From the following options, pick the one that best depicts the phenotypic and genotypic ratios of Medelian crosses regarding law of Segregation:
1:2:1 and 3:1 respectively
3:1 and 1:2:1 respectively
9:3:3:1 and 1:2:1 respectively
3:1 and 9:3:3:1 respectively
Which of the following type of genetic disorder mainly affects the females?
X-linked recessive traits
X-linked dominant traits
Pseudo-autosomal traits
Y-linked traits
When vasopressin is not secreted, the condition that occurs is called?
Acromegaly
Diabetes mellitus
Dwarfism
Diabetes insipidus
Cortisol brings about an increase in blood glucose level mainly by its production from protein and _________.
Glucagon
Insulin
Estrogen
Progesterone
Which disease is represented by excess MSH secretion?
Addison's
Alzheimer's
Parkinson's
Cohn’s
Largest gland is__________.
Liver
Pituitary
Thyroid
Thymus
Which of these does not participate in reflex actions?
Motor neuron
Effector
Pituitary
Spinal cord
Most reflex arcs are:
Monosynaptic reflex
Polysynaptic reflex
Hemi Synaptic Reflex
None of these
Monosynaptic refers to the presence of how many chemical synapse/s?
1
2
3
4
All of the following about reflex action are true except:
It is voluntary
It is found in higher animals
It is involuntary
All of these
Which of the following is an example of superficial reflex?
Ankle jerk
Knee jerk
Abdominal reflex
Both A & B
