NEET Mock Test - 24


180 Questions MCQ Test NEET Mock Test Series & Past Year Papers | NEET Mock Test - 24


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This mock test of NEET Mock Test - 24 for NEET helps you for every NEET entrance exam. This contains 180 Multiple Choice Questions for NEET NEET Mock Test - 24 (mcq) to study with solutions a complete question bank. The solved questions answers in this NEET Mock Test - 24 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this NEET Mock Test - 24 exercise for a better result in the exam. You can find other NEET Mock Test - 24 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

There are four data given A = 5.00 m, B = 5.00 cm, C = 50.00 m and D = 5.00 mm. Select the most precise and most accurate data

Solution:
QUESTION: 2

A projectile is projected at an angle θ(> 45°) with initial speed u. The time t at which magnitude of vertical component of its velocity is equal to magnitude of horizontal component of its velocity, is

Solution:
QUESTION: 3

A particle is moving along x-axis such that its velocity varies with time t as v = 20 .At t = 0 particle is at origin. Select correct position (x) – time (t) plot for the particle

Solution:
QUESTION: 4

A quantity P is calculated by P = ,which quantity should be measured with best care to minimize error in P?

Solution:
QUESTION: 5

Velocity of the body of mass 10 kg changed from 2 m/s along east to 3 m/s along west in 5s.Average force acting on the body is

Solution:
QUESTION: 6

Variation of force F acting on a body with time t is as shown in figure. Change in momentum of the body in the interval 0 to 20 s is

Solution:
QUESTION: 7

Potential energy of a particle at position x is given by u = (- x2 + 2x) J. Force on the particle at x = 1 m is

Solution:
QUESTION: 8

A body of mass m moving with speed v compresses a spring of force constant k as shown in figure. Maximum compression of the spring is equal to

Solution:
QUESTION: 9

From a disc of radius R, a disc of radius  is taken out as shown in figure. Position of the centre of mass of remaining disc is on

Solution:
QUESTION: 10

A uniform rod of length L is kept vertical as shown in figure. If there is non slipping at A and the rod is allowed to fall, then end B will hit the ground with speed

Solution:
QUESTION: 11

The pulley has moment of inertia l and radius is r. If there is no slipping of string over the pulley, then acceleration of the block of mass m is

Solution:
QUESTION: 12

A cube of side L and mass M is placed on rough horizontal surface and the friction is sufficient so that it will not move, if a constant force F = Mg is applied horizontally at a distance L / 4 above the surface. Then the torque due to normal force about centre of the cube is equal to

Solution:
QUESTION: 13

If a new planet is discovered rotating around the Sun with the orbital radius double that of earth, then what will be its time period (in earth’s days)?

Solution:
QUESTION: 14

If percentage error in the measurement of length and time period of a simple pendulum are 2% and 3% respectively, then the maximum error in the measurement of acceleration due to gravity is

Solution:
QUESTION: 15

Which one of the following figures correctly represents the flow of fluid through a tube with constructions as shown in the diagram

Solution:
QUESTION: 16

A uniform plank of Young’s modulus Y is moved over a smooth horizontal surface by a constant horizontal force F0.The area of cross-section of the plank is A. The strain on the plank in the direction of the force is

Solution:

QUESTION: 17

The work done to get 64 identical spherical water droplets to form a bigger spherical drop of water of radius R is W. The surface tension of water is

Solution:
QUESTION: 18

Rain drops fall from a height under gravity; we observe that :

Solution:
QUESTION: 19

The load versus elongation graphs for four wires A, B, C and D of the same material of same length are shown in the figure. The thinnest wire is represented by the line:

Solution:
QUESTION: 20

The excess pressure inside one soap bubble is three times that inside a second soap bubble, then the ratio of their surface area is

Solution:
QUESTION: 21

The differential equation of SHM for a particle is given by = 0.The ratio of the maximum acceleration to the maximum velocity of the particle is

Solution:
QUESTION: 22

A particle is performing SHM. If its kinetic energy is K, potential energy is U and its displacement from mean position is x then which of the following graph is correct if equation of SHM is x = A sin ωt.

Solution:
QUESTION: 23

An organ pipe P1 closed at one end vibrating in its first harmonic and another pipe P2 open at both ends vibrating in its third harmonic are in resonance with a given tuning fork. The ratio of the length of P1 to that of P2 is

Solution:
QUESTION: 24

A transverse wave traveling along negative y-axis its snap shot is given at any instant of time t.Points which is having velocity in negative x-direction

Solution:
QUESTION: 25

A cylindrical metal rod of length L0 is shaped into a ring with a small gap as shown in figure.On heating the system.

Solution:
QUESTION: 26

An ideal monatomic gas is taken round the cycle ABCDA as shown in the P–V diagram (see Fig.). The work done during the cycle is

Solution:
QUESTION: 27

If ,   and   are the unit vectors along the incident ray, reflected ray and the outward normal to the reflector. Then

Solution:
QUESTION: 28

A point object is placed at a distance of 1000 mm from a concave mirror of focal length 400 mm. If the object is moved towards the mirror by 200 mm, the image moves by a distance of

Solution:
QUESTION: 29

Point charge +4q, -q and +4q are kept on the x-axis at points x = 0, x = a and x = 2a respectively. Then:

Solution:
QUESTION: 30

In a regular polygon of n sides, each corner is at a distance r from the centre. Identical charges of magnitude q are placed at (n – 1) corners. The field at the centre is

Solution:
QUESTION: 31

The net resistance between point P and Q in the circuit shown in the figure is

Solution:
QUESTION: 32

Current in the wire varies according to equation I =15sin 50πt where I is in ampere, t is in second and (50 πt) is in radian. How much net charge has passed a cross-section of the wire in the interval t = 0 to t = 40 ms :

Solution:
QUESTION: 33

Six long straight wires are located at the corners of a regular hexagon ABCDEF. All wires carry equal currents. Current in the all wires is into the plane of paper. The magnetic field at the centre O is along

Solution:
QUESTION: 34

The magnetic field lines in a long solenoid are as shown. If the solenoid is cut into two parts, the figure that best represents the field

Solution:
QUESTION: 35

A square loop of side 4 cm is lying on a horizontal table. A uniform magnetic field of 0.5 T is directed downwards at an angle of 60° to the vertical as shown in figure. If the field increases from zero to its final value in 0.2 s, the emf induced in the loop will be

Solution:
QUESTION: 36

Induced electric field due to varying magnetic field forms closed loops

Solution:
QUESTION: 37

The magnetic field energy in an inductor changes from minimum to maximum value in 2.5 ×10-3 s when connected to an AC source. The frequency of the source is:

Solution:
QUESTION: 38

In the figure, which of the phasor diagram represents RLC circuit driven at resonance?

Solution:
QUESTION: 39

At t = 0, light of intensity 1012 photons/s–m2 of energy 6eV per photon start falling on a plate with work function 2.5 eV. If area of the plate is 2 × 10-4 m2 and for every 105 photons one photoelectron is emitted, charge on the plate at t = 25 s is

Solution:
QUESTION: 40

The figure shows the variation of photo current with anode potential for a photo-sensitive surface for three different radiations. Let Ia,Ib and Ic be the intensities and fa, fb and fc be the frequencies for the curves a, b and c respectively

Solution:

 Answer :- A

Solution :- Stopping potential of a&b same so frequency f(a) = f(b)

Saturated photoelectric current of b&c same so intensity I(b) = I(c) > I(a)

QUESTION: 41

The horizontal range of a projectile is R and the maximum height attained by it is H. A strong wind now begins to blow in the direction of the motion of the projectile, giving it a constant horizontal acceleration = g/2. Under the same conditions of projection, the horizontal range of the projectile will now be

Solution:
QUESTION: 42

A small object O is placed in front of a convex mirror, forming a virtual image, I. A narrow beam of light of light is now made incident on the mirror, aimed at I. After reflection at the mirror, the beam will reach O

Solution:
QUESTION: 43

A particle of mass m and charge Q is placed in an electric field E which varies with time t as E = E0sin t.It will undergo simple harmonic motion of amplitude

Solution:
QUESTION: 44

When beats are formed between sound waves of slightly different frequencies, the intensity of the sound heard changes from maximum to minimum in 0.2 s. The difference in frequencies of the two sound waves is

Solution:

The duration of one beat is from one maximum to the next maximum of intensity. In this case, it is 0.4 s.

∴ the number of beats per second = 2.5 = the difference in frequencies. 

QUESTION: 45

An infinitely long thin conductor, shaped as shown, carries current. Each section is of the same length.The magnetic field at the point P due to the section from to A is B. The field at P due to the entire conductor is

Solution:
QUESTION: 46

Which fact is correct for gases?

Solution:
QUESTION: 47

Which fact is correct for joul Thomson effect T1 and T2 and are temperature of gas before and after expansion?

Solution:

If a gas cools in a JT expansion, T2 < T1 and the JT coefficient is positive (since P2 < P1). Alternatively, if the gas warms, µJT is negative.

QUESTION: 48

Which fact is wrong out of following?

Solution:
QUESTION: 49

Out of following which is spinel structure?

Solution:
QUESTION: 50

A polypeptide containing disulfide bonds is likely to be rich in which of the following amino acids?

Solution:
QUESTION: 51

Which one will be cyclic structure?

Solution:
QUESTION: 52

Which statement is wrong?

Solution:
QUESTION: 53

Which statement is correct

Solution:
QUESTION: 54

Heat of hydrogenation of cyclohexen is 119.5 Kcal. Heat of hydrogenation of benzene is 248 Kcal. Resonance energy will be

Solution:
QUESTION: 55

Which cell is possible?

Solution:
QUESTION: 56

Which equation is correct for given acid solution?

Solution:

EH2 = EH2° - 0.0591×log[H+]/n
At pressure = 1 atm and at1M concentration, EH2° = 0
EH2 = 0-0.0591×log[H+]/1
But pH = -log[H+]
So, EH2 = 0.0591pH

QUESTION: 57

Units of 2nd order will be

Solution:
QUESTION: 58

Which oxidizing agent will have equivalent weight as ?

Solution:
QUESTION: 59

Factors affecting adsorption will be

Solution:
QUESTION: 60

Gel is

Solution:
QUESTION: 61

If S is solubility product of Ag2CrO4 , solubility of Ag2CrO4 in 10-2 K2CrO4 will be

Solution:
QUESTION: 62

PCl5   PCl3 + Cl2 ,Kc = 10-8 Degree of dissociation will be

Solution:
QUESTION: 63

  C will be

Solution:
QUESTION: 64

1 butyne is converted to 2 butyne by using

Solution:
QUESTION: 65

Mustard gas obtained by

Solution:
QUESTION: 66

Which one explodes on heating in dry state?

Solution:
QUESTION: 67

Which one will shows Beackman’s rearrangement?

Solution:
QUESTION: 68

. B will be

Solution:
QUESTION: 69

Expected shape of Br3-  is

Solution:
QUESTION: 70

Anhydride is obtained when

Solution:
QUESTION: 71

Out of following which reacts with KCN?

Solution:
QUESTION: 72

In contact process, SO2 is converted to SO3
2SO2 + O2 → 2SO3. The best condition for the maximum yield are

Solution:
QUESTION: 73

For the electronic configuration [Ne] ns2np2 how many empty orbitals are there if n = 3?

Solution:
QUESTION: 74

Which of the following molecular orbital has tow nodal planes?

Solution:
QUESTION: 75

At constant temperature for a heterogeneous equilibrium the value of Kp will be

3Fe(s) + 4H2O(g) Fe3O4(s) + 4H2(g)

Solution:
QUESTION: 76

When 1 mole of NO-3 is converted into 1 mole NO2 , 0.5 mole N2 and 0.5 mole N2O respectively, it accepts X, Y and Z moles of electrons, X, Y and Z are respectively

Solution:
QUESTION: 77

The amino acid glycine exists prediominantly in the form  its conjugate base and conjugate acid will be respectively

Solution:
QUESTION: 78

A group of acidic oxide is

Solution:
QUESTION: 79

A mixture of H2 and O2 in the 2 : 1 volume ratio is allowed to diffuse through a porous plug.The composition of gas mixture coming out initially is

Solution:
QUESTION: 80

Polyethylene can be produced from calcium carbide according to the following sequence of reaction s
CaC2 + H2O → CaO + HC ≡ CH
nHC ≡ CH + nH2 → (CH2 - CH2 )n
The mass of polythlene which can be produced from 20 kg of CaC2 is

Solution:
QUESTION: 81

In the following compounds, the order of acidity is     

Solution:
QUESTION: 82

Production of chloroform form CClneeds

Solution:
QUESTION: 83

If there are 17 carbon atoms present in the carbon chain attached to COONa group. The soap is called

Solution:
QUESTION: 84

Enzymes are basically

Solution:
QUESTION: 85

  B will be

Solution:
QUESTION: 86

200 ml of 0.01 M KMnO4 oxidise 20 ml of H2O2 sample in acidic medium. The volume strength of H2O2 is

Solution:
QUESTION: 87

The electron of H-atom transits from n = 1 to n = 4 by absorbing energy. If the energy of n = 1 state is – 21.8 × 10-19 Joule then its energy in n = 4 state will be :

Solution:
QUESTION: 88

The first ionisation potential of Na, Mg, Al and Si are in the order

Solution:
QUESTION: 89

The order in which the following oxides are arranged according to decreasing basic nature is:

Solution:
QUESTION: 90

Molecular shapes of SF4, CF4 and XeF4 are

Solution:
QUESTION: 91

How many plants in the list given below have marginal placentatios Mustard,Gram, Tulip, As paragus, Arhar, Sunhemp, Chilli, Colchicine, Onion, Moong, pea, tobacco, lupin :

Solution:
QUESTION: 92

Which one of the following organisms is correctly matched with its three characteristics?

Solution:
QUESTION: 93

The correct floral formula of chilli is :

Solution:

Chilli belongs to Solanaceae.

QUESTION: 94

Flowers are zygomorphic in ?

Solution:
QUESTION: 95

A drupe develops in ?

Solution:
QUESTION: 96

Which one of the following statements is correct :

Solution:
QUESTION: 97

Ground tissue includes :

Solution:
QUESTION: 98

In land plants, the guard cells differ from other epidermal cells in having :

Solution:
QUESTION: 99

The cork cambium, cork and secondary cortex are collectively called :

Solution:
QUESTION: 100

Which one of the following is essential for photolysis of water ?

Solution:
QUESTION: 101

Guttation is the result of :

Solution:
QUESTION: 102

Which one of the following is not an essential mineral element for plants while the remaining three are?

Solution:
QUESTION: 103

What is common b/w vegetative reproduction and apomixes :

Solution:
QUESTION: 104

In angiosperms, functional megaspore develops into :

Solution:
QUESTION: 105

In Mitochondria, protons accumulate in the :

Solution:
QUESTION: 106

Function of companion cells is?

Solution:
QUESTION: 107

Which one of the following is correctly matched ?

Solution:
QUESTION: 108

A process that makes important difference b/w C3 and C4 plants is :

Solution:
QUESTION: 109

Best defined function of manganese in green plant is :

Solution:
QUESTION: 110

The correct sequence of cell organelles during photorespiration is :

Solution:
QUESTION: 111

When domestic sewage mixes with river water ?

Solution:
QUESTION: 112

Which one of the following is most appropriately defined ?

Solution:
QUESTION: 113

The Indian Rhinoceros is a natural inhabitat of which one of the Indian states ?

Solution:
QUESTION: 114

The logistic population growth is expressed by the equation ?

Solution:
QUESTION: 115

“Good Ozone” is found in the :

Solution:
QUESTION: 116

Biodiversity of a geographical region represents :

Solution:
QUESTION: 117

Consider the following statements : (A)- (D) each with one or two blanks
(A) Bears go into (1) during winter to (2) cold weather
(B) A conical age pyramid with a broad base represents (3) human population
(C) A wasp pollinating a fig flower is an example of (4)
(D) An area with high levels of species richness is knows as (5)

which one of the following options, gives the correct fill ups for the respective blank numbers from (1) to (5) in the statements ?

Solution:

The answer of this question will be Option D because fishes go into aestivation during summer and in a stable population, age pyramid is not conical. It is at first, flat and then becomes conical.
 

QUESTION: 118

The breakdown of detritus into smaller particles by earthworm is a process called :

Solution:
QUESTION: 119

Both, hydarch and Xerarch successions lead to :

Solution:
QUESTION: 120

Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time ?

Solution:
QUESTION: 121

Consider the following four statements whether they are correct or wrong.
(A) The sporophyte in liverworts is more elaborate than that in mosses
(B) Salvia is heterosporous
(C) The life cycle in all seed bearing plants is diplontic
(D) In pinus male and female cones are borne on different trees.

The two wrong statements together are :

Solution:
QUESTION: 122

Selaginella and salvia are considered to represent a significant step towards evolution of seed habit because :

Solution:
QUESTION: 123

You have a potato, carrot, radish, sweet potato, tomato, peas and ginger bought from the market in your jute bag. Identify two vegetables to represent the correct homologous structures.

Solution:
QUESTION: 124

Whorled, simple leaves with reticulate venation are present in :

Solution:
QUESTION: 125

Some vascular bundles are described as open because these :

Solution:
QUESTION: 126

In Kranz anatomy, the bundle sheath cells have :

Solution:
QUESTION: 127

Virus envelops is known as :

Solution:
QUESTION: 128

Infectious proteins are present in :

Solution:
QUESTION: 129

Which one of the following cannot be explained on the basis of Mendel’s law of dominance ?

Solution:

According to the law of dominance, a heterozygous individual carries two contrasting alleles/ factors of a gene. Here only one allele can express itself in the individual. It is called as dominant allele. The allele which does not show itself in a heterozygous individual is known as recessive allele. Each character in an organism is controlled by a gene which has two alleles. Hence this law suggest that each character of an organism is represented by atleast two factors and that one allele (dominant allele) shows its effect in both homozygous and heterozygous condition while the other one (recessive) shows itself in homozygous condition only. Options B, C and D can be explained by this law. The law of segregation states that two alleles for one gene do not blend with each other. 

So, the correct answer is option D 'Alleles do not show any blending and both the characters recover as such in F2 generation'.

QUESTION: 130

The genotype of a plant showing the dominant phenotype can be determined by :

Solution:
QUESTION: 131

The one aspect which is not a salient feature of genetic code, is its being :

Solution:
QUESTION: 132

Satellite DNA is useful in :

Solution:
QUESTION: 133

Which one of the following does not follow the central dogma of molecular biology ?

Solution:
QUESTION: 134

Select the two correct statements out of the four given below about lac operon

(I) Glucose and galactose may bind with the repressor and inactivate it

(II) In the absence of lactose the repressor binds with the operator region

(III)The Z-gene codes for permease

(IV) This was elucidated by Francars Jacob and Jacque Monod.

The correct statements are :

Solution:
QUESTION: 135

Which one of the following symbols and its representation used in human pedigree analysis is correct ?

Solution:
QUESTION: 136

Read the following features :-
(i) Nerve chord is Dorsal, hollow & single. 
(ii) Gill clefts are found in pharynx
(iii) Notochord absent
(iv) Ventral heart

Out of these which are the features shown by a typical chordate animal ?

Solution:
QUESTION: 137

In addition to malpighian tubules which other structures also help in excretion in cockroach?

Solution:
QUESTION: 138

Which one of the following statements about human sperm is correct?

Solution:
QUESTION: 139

Which of the following statements are true/false?

(A)Calcitonin regulates the homeostasis of calcium alongwith PTH

(B)Oxytocin stimulates contraction of uterine muscles during birth

(C) "Grave's disease" is caused by malfunctioning of adrenal gland

(D)ADH stimulates absorption of water and increase the urine production.

Solution:
QUESTION: 140

It is a diagramatic presentaion of the human foetus within the uterus,choose the correct option about A, B and C

Solution:
QUESTION: 141

Read the following statements.
(a) Tissue matching and blood matching is essential before transplantation.
(b) Symptoms of allergy are rapidly decreased with the use of antihistamine, adrenaline and steroids.
(c) Pneumonia and common cold are spread to a healthy person through droplets of an infected person by cough and sneezing.
(d) Tumor cells don't show contact inhibition.

How many of above sentences are true

Solution:
QUESTION: 142

The given below diagram is of female reproductive system. Identify the structures which are marked as A,B, C and D :-

Solution:
QUESTION: 143

Cartilagenous joint is found in :-

Solution:
QUESTION: 144

Given below is a diagram showing parts of an eye. Which of the following option is correctly matched with statements and their labelling?

(i) Visible coloured portion of the eye
(ii) Non vascular, transparent portion
(iii)Photoreceptor cells are absent in this region
(iv)Portion of retina where only the cones are densely packed

Solution:
QUESTION: 145

Consider the following statements regarding the above diagrammatic representation :-
(A)Miller experiment at laboratory scale
(B) Proved theory of Oparin and Haldane that life orginated from non-living organic molecules like R.N.A. and Proteins
(C) Formation of amino-acids was observed
(D) Experiment demostrated that life comes only from pre existing life.Which of the above statements are correct :-

Solution:
QUESTION: 146

In the given figure, what is indicated by 'X' ?

Solution:
QUESTION: 147

Select the option with the correct identification of animals (A-D) in the above family tree of dinosaurs.

Solution:
QUESTION: 148

Read the following four statements (A – D) :-
(A) Tricuspid valve is present in between right auricle and right ventricle
(B) Bicuspid valve is present in between right auricle and right ventricle
(C) Semilunar valves are present at the opening of pulmonary arch and carotid systemic arch.
(D) All these valves are always be bidirectional. Out of these how many statements are incorrect?

Solution:
QUESTION: 149

Observe the diagrams given below of pBR322 plasmid :

-

Presence of which of the following vector in the host will help in screening of transformants that can grow on ampicillin containing medium but not on that containing tetracycline ?

Solution:
QUESTION: 150

Match the following :-
(A) Jaundice                (i) Difficulty in breathing
(B) Pernicious             (ii) Decreased anemia absorption
(C) Diarrhoea              (iii) Bile pigment
(D) Asthma                  (iv) Vit B12

Solution:
QUESTION: 151

Identify A, B and C in given pathway of sperms in mammals :-

Solution:
QUESTION: 152

The zygote or early embryos (with up to 8 blastomeres) could be transferred into the fallopian tube, it is called –

Solution:
QUESTION: 153

A diagrammatic presentation of a reflex action is given below :-

(a) Occurs involuntarily and without conscious efforts
(b) At least one afferent and one efferent neuron required
(c) Interneuron is involved in the action
(d) Monosynaptic and unconditioned reflex
(e) Knee - Jerk reflex is regulated by spinal cord
Which of the above statements are correct for the above reflex action ?

Solution:
QUESTION: 154

VNTR belongs to a class of satellite DNA referred to as minisatellites. They are/have :-

Solution:
QUESTION: 155

Which points are correct about given animal ?

(A) Diploblastic, Radial symmetry

(B) Sexes are separate

(C) Exclusively marine

(D) Digestion is both extracellular and intracellular

Solution:
QUESTION: 156

Which of the following set has same number of chromosome

Solution:
QUESTION: 157

Total volume of air a person can inspire after a normal expiration is :-

Solution:
QUESTION: 158

Recombinant colonies do not produce any colour in the presence of chromogenic substrate due to:-

Solution:
QUESTION: 159

Which one of the following is an example of biological control of pest using microbes ?

Solution:
QUESTION: 160

Read the following term's explanations and find out correct match :-

Solution:
QUESTION: 161

Which of the following statement is correct about excretion ?

Solution:
QUESTION: 162

How many of the following animals are vertebrates ?
Flying Fish, Star Fish, Silver Fish, Dog Fish, Cat Fish, Jelly Fish

Solution:
QUESTION: 163

Which one of the following groups of animals reproduces only by sexual means?

Solution:
QUESTION: 164

The initial step in the digestion of milk in humans is carried out by:

Solution:
QUESTION: 165

The serous membrane which covers the lungs is called :

Solution:
QUESTION: 166

Which blood cells can engulf bacteria by phagocytosis?

Solution:
QUESTION: 167

The following is/are removed during hemodialysis:

Solution:
QUESTION: 168

What type of cartilaginous tissue is found in the intervertebral discs?

Solution:
QUESTION: 169

Which exitatory neutrotransmitter is involved in the transmission of impulse at the neuromuscular junction?

Solution:
QUESTION: 170

Which of the following hormones is a derivative of fatty acid?

Solution:
QUESTION: 171

The structure of E. coli chromosomal DNA is–

Solution:
QUESTION: 172

Which of the following sugars cannot be hydrolyzed further to yield simple sugars?

Solution:
QUESTION: 173

How many secondary spermatocytes are required to form 400 spermatozoa?

Solution:
QUESTION: 174

Assisted reproductive technology, IVF involves transfer of: