MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Diagrams
Games
NEET
NEET Previous Year Question Papers
Quiz 4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
Which of the following features is used to identify a male cockroach from a female cockroach?
0%
Presence of anal cerci
0%
Presence of a boat shaped sternum on the 9th abdominal segment
0%
Presence of caudal styles
0%
Forewings with darker tegmina
Explanation
Male cockroaches have a pair of anal styles (caudal styles) on the last abdominal segment, which females lack — this is the key distinguishing feature between the sexes. (Anal cerci are present in both sexes, so they don't help distinguish male from female.)
Q.2
AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?
0%
ACCUAUGCGAU
0%
UCCAUAGCGUA
0%
UGGTUTCGCAT
0%
AGGUAUCGCAU
Explanation
mRNA has the same sequence as the CODING (sense) strand, just with U in place of T (since mRNA is synthesised complementary to the template strand, which makes it match the coding strand). Directly substituting U for T: AGGTATCGCAT → AGGUAUCGCAU.
Q.3
Which of the following events does not occur in rough endoplasmic reticulum?
0%
Cleavage of signal peptide
0%
Phospholipid synthesis
0%
Protein glycosylation
0%
Protein folding
Explanation
Phospholipid synthesis is carried out by the smooth endoplasmic reticulum, not the rough ER. The rough ER (studded with ribosomes) is instead where signal peptide cleavage, protein glycosylation, and protein folding take place.
Q.4
All of the following are part of an operon except
0%
a promoter
0%
an enhancer
0%
an operator
0%
structural genes
Explanation
A classic (prokaryotic) operon consists of a promoter, an operator, and the structural genes it controls. Enhancers are a feature of eukaryotic gene regulation, not a component of the operon model.
Q.5
Match the columns
Column I
(Function)
Column II
(Part of Excretory system)
a. Ultrafiltration
(i) Henle's loop
b. Concentration of urinr
(ii) Ureter
c. Transport of urine
(iii) Urinary bladder
d. Storage of urine
(iv) Malpighian corpuscle
---
(v) Proximal convoluted tubule
0%
a -- iv b -- i c -- ii d -- iii
0%
a -- v b -- iv c -- i d -- ii
0%
a -- v b -- iv c -- i d -- iii
0%
a -- iv b -- v c -- ii d -- iii
Explanation
Matching each function to its structure: Ultrafiltration happens at the Malpighian corpuscle (iv); concentration of urine happens along Henle's loop (i); transport of urine is the job of the ureter (ii); and storage of urine happens in the urinary bladder (iii).
Q.6
Which of the following has proved helpful in preserving pollen as fossils?
0%
Sporopollenin
0%
Cellulosic intine
0%
Oil content
0%
Pollenkitt
Explanation
Sporopollenin, the extremely tough biopolymer forming the outer wall of pollen grains, resists high temperatures, strong acids and alkalis, and enzymatic breakdown — which is exactly why pollen preserves so well as fossils.
Q.7
After karyogamy followed by meiosis, spores are produced exogenously in
0%
Agaricus
0%
Saccharomyces
0%
Alternaria
0%
Neurospora
Explanation
Agaricus (a mushroom-forming basidiomycete) produces its spores (basidiospores) exogenously, on the outer surface of the basidium, after karyogamy and meiosis. Saccharomyces, Alternaria, and Neurospora are all ascomycetes, which instead produce spores endogenously, inside a sac-like ascus.
Q.8
Which of the following is not an autoimmune disease?
0%
Alzheimer's disease
0%
Vitiligo
0%
Psoriasis
0%
Rheumatoid arthritis
Explanation
Alzheimer's disease is a neurodegenerative condition caused by abnormal protein buildup in the brain — it isn't caused by the immune system attacking the body's own tissue, unlike vitiligo, psoriasis, and rheumatoid arthritis, which are all genuine autoimmune diseases.
Q.9
Which of the following terms describe human dentition?
0%
Thecodont, Diphyodont, Homodont
0%
Pleurodont, Diphyodont, Heterodont
0%
Thecodont, Diphyodont, Heterodont
0%
Pleurodont, Monophyodont, Homodont
Explanation
Human teeth are described as thecodont (each tooth set in its own socket), diphyodont (two successive sets — milk teeth then permanent teeth), and heterodont (different tooth types — incisors, canines, premolars, molars — for different functions).
Q.10
Plants having little or no secondary growth are
0%
Cycads
0%
Deciduous angiosperms
0%
Grasses
0%
Conifers
Explanation
Grasses (monocots) generally lack a vascular cambium and so undergo little to no secondary growth, unlike woody dicots (deciduous angiosperms) and gymnosperms (cycads, conifers), which do develop secondary growth.
Q.11
Nissl bodies are mainly composed of
0%
DNA and RNA
0%
Proteins and lipids
0%
Free ribosomes and RER
0%
Nucleic acids and SER
Explanation
Nissl bodies (Nissl substance) in neurons are essentially clusters of rough endoplasmic reticulum together with free ribosomes — both involved in the neuron's active protein synthesis.
Q.12
Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?
0%
Ti plasmid
0%
\(\lambda\) phage
0%
pBR 322
0%
Retrovirus
Explanation
Retroviruses are commonly used as vectors to introduce DNA into human cells such as lymphocytes (a well-known approach in gene therapy) — they naturally integrate their genetic material into the host genome. Ti plasmid, λ phage, and pBR322 are vectors more typically used with plant or bacterial cells.
Q.13
Which of the following is an occupational respiratory disorder?
0%
Botulism
0%
Anthracis
0%
Silicosis
0%
Emphysema
Explanation
Silicosis, caused by inhaling fine silica dust (common in mining and quarrying work), is a classic occupational lung disease. (Botulism is food poisoning; emphysema, while a serious lung disease, isn't specifically classified as an "occupational" disorder the way dust-exposure diseases like silicosis are.)
Q.14
Match the columns
Column I
Column II
a. Tricuspid valve
(i) Between left atrium
and left ventricle
b. Bicuspid valve
(ii) Between right
ventricle and
pulmonary artery
c. Semilunar valve
(iii) Between right
atrium and right
ventricle
0%
a. -- i b. -- iii c. -- ii
0%
a. -- iii b. -- i c. -- ii
0%
a. -- i b. -- ii c. -- iii
0%
a. -- ii b. -- i c. -- iii
Explanation
Matching each valve to its location: the tricuspid valve sits between the right atrium and right ventricle (iii); the bicuspid (mitral) valve sits between the left atrium and left ventricle (i); and the semilunar valve sits between the right ventricle and the pulmonary artery (ii).
Q.15
Which of the following characteristics represent ‘Inheritance of blood groups’ in humans? a. Dominance b. Co-dominance c. Multiple allele d. Incomplete dominance e. Polygenic inheritance
0%
a, b and c
0%
a, c and e
0%
b, c and e
0%
b, d and e
Explanation
The ABO blood group system shows dominance (I^A and I^B are both dominant over i), co-dominance (I^A and I^B are co-dominant to each other, giving type AB), and is a multiple-allele system (three alleles — I^A, I^B, i — for one gene). It doesn't show incomplete dominance (a blended phenotype) or polygenic inheritance (multiple different genes), since it's governed by a single gene.
Q.16
Which one of these animals is not a homeotherm?
0%
Psittacula
0%
Camelus
0%
Macropus
0%
Chelone
Explanation
Chelone (a turtle) is a reptile — reptiles are ectotherms (cold-blooded), regulating their body temperature from the environment, unlike true homeotherms (warm-blooded animals).
Q.17
Offsets are produced by
0%
Parthenocarpy
0%
Parthenogenesis
0%
Mitotic divisions
0%
Meiotic divisions
Explanation
Offsets are a form of vegetative (asexual) propagation, produced through ordinary mitotic cell divisions of the parent plant's tissue — not through meiosis, parthenocarpy (fruit development without fertilisation), or parthenogenesis (development from an unfertilised egg).
Q.18
All of the following are included in ‘ex-situ conservation’ except
0%
Wildlife safari parks
0%
Sacred groves
0%
Botanical gardens
0%
Seed banks
Explanation
Sacred groves are patches of forest protected within their own natural setting by local communities — that makes them an example of IN-SITU conservation, not ex-situ. Wildlife safari parks, botanical gardens, and seed banks all preserve organisms or genetic material away from their natural habitat, which is what ex-situ conservation means.
Q.19
Among the following sets of examples for divergent evolution, select the incorrect option :
0%
Eye of octopus, bat and man
0%
Forelimbs of man, bat and cheetah
0%
Heart of bat, man and cheetah
0%
Brain of bat, man and cheetah
Explanation
A camera-type eye evolving independently and similarly in octopus, bat, and man (despite very different ancestries) is a classic example of CONVERGENT evolution (analogous structures), not divergent evolution — making this the incorrect pairing. (Forelimbs, hearts, and brains across bat, man, and cheetah are genuinely homologous structures from a shared ancestor that diverged for different specific roles — true divergent evolution.)
Q.20
A ‘new’ variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to
0%
Sharbati Sonora
0%
Basmati
0%
Co-667
0%
Lerma Rojo
Explanation
The Basmati rice patent controversy — where a foreign company patented a rice variety already long cultivated in India — is a well-known case study in biopiracy.
Q.21
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
0%
\(-120^0C\)
0%
\(-80^0C\)
0%
\(-196^0C\)
0%
\(-160^0C\)
Explanation
Liquid nitrogen, used for long-term cryopreservation of pollen, has a temperature of about −196°C.
Q.22
Which of the following hormones can play a significant role in osteoporosis?
0%
Parathyroid hormone and Prolactin
0%
Estrogen and Parathyroid hormone
0%
Progesterone and Aldosterone
0%
Aldosterone and Prolactin
Explanation
Estrogen deficiency (especially post-menopause) is a major driver of bone density loss, and parathyroid hormone regulates calcium release from bone — imbalances in both hormones play a significant role in osteoporosis.
Q.23
Double fertilization is
0%
Fusion of one male gamete with two polar nuclei
0%
Fusion of two male gametes of a pollen tube with two different eggs
0%
Syngamy and triple fusion
0%
Fusion of two male gametes with one egg
Explanation
Double fertilisation in angiosperms consists of two fusion events: syngamy (one male gamete fusing with the egg cell, forming the zygote) and triple fusion (the second male gamete fusing with the two polar nuclei, forming the triploid endosperm).
Q.24
The difference between spermiogenesis and spermiation is
0%
In spermiogenesis spermatozoa are formed, while in spermiation spermatids are formed.
0%
In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
0%
In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.
0%
In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed.
Explanation
Spermiogenesis is the process by which spermatids transform into fully formed spermatozoa. Spermiation is the separate, later step where those already-formed spermatozoa are released from the Sertoli cells into the lumen (cavity) of the seminiferous tubules.
Q.25
Which one of the following population interactions is widely used in medical science for the production of antibiotics?
0%
Mutualism
0%
Amensalism
0%
Parasitism
0%
Commensalism
Explanation
Amensalism — where one organism harms or inhibits another without being affected itself — is exploited in antibiotic production, most famously with Penicillium mould producing penicillin that kills susceptible bacteria.
Q.26
What is the role of \(NAD^+\) in cellular respiration?
0%
It functions as an enzyme.
0%
It is a nucleotide source for ATP synthesis.
0%
It functions as an electron carrier.
0%
It is the final electron acceptor for anaerobic respiration.
Explanation
NAD⁺ acts as an electron (and hydrogen) carrier during cellular respiration — picking up electrons during glycolysis and the Krebs cycle (becoming NADH) and delivering them to the electron transport chain.
Q.27
Match the columns
Column I
Column II
a. Proliferative Phase
(i) Breakdown of endometrial lining
b. Secretory Phase
(ii) Follicular Phase
c. Menstruation
(iii) Luteal Phase
0%
a -- iii b -- i c -- ii
0%
a -- ii b -- iii c -- i
0%
a -- iii b -- ii c -- i
0%
a -- i b -- iii c -- ii
Explanation
The proliferative phase of the menstrual cycle corresponds to the follicular phase (ii); the secretory phase corresponds to the luteal phase (iii); and menstruation is the breakdown/shedding of the endometrial lining (i).
Q.28
Which of the following structures or regions is incorrectly paired with its functions?
0%
Corpus callosum : band of fibers connecting left and right cerebral hemispheres
0%
Medulla oblongata : controls respiration and ardiovascular reflexes
0%
Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement
0%
Hypothalamus : production of releasing hormones and regulation of temperature, hunger and thirst
Explanation
The limbic system is primarily associated with emotions, memory, and behaviour, not movement control (which is instead governed by structures like the cerebellum, motor cortex, and basal ganglia) — making this the incorrectly described pairing. (The other three descriptions — corpus callosum, medulla oblongata, and hypothalamus — are all correctly described.)
Q.29
The two functional groups characteristic of sugars are
0%
Carbonyl and hydroxyl
0%
Carbonyl and methyl
0%
Hydroxyl and methyl
0%
Carbonyl and phosphate
Explanation
Sugars are chemically defined by having a carbonyl group (an aldehyde in aldoses or a ketone in ketoses) together with multiple hydroxyl groups.
Q.30
Select the incorrect match :
0%
Polytene chromosomes – Oocytes of amphibians
0%
Lampbrush chromosomes – Diplotene bivalents
0%
Submetacentric chromosomes – L-shaped chromosome
0%
Allosomes – Sex chromosomes
Explanation
Polytene chromosomes are actually found in the salivary glands of dipteran insect larvae (like Drosophila), not in amphibian oocytes — making this the incorrect match. (Lampbrush chromosomes, not polytene ones, are the type found in amphibian oocytes during the diplotene stage of meiosis — the other three pairings given are correct.)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)