KCET 2024 Biology Question Paper: Download Question Paper with Solution PDF

Which among the following is used to treat Emphysema?

• (A) Human Hormone - α-Antitrypsin
• (B) Human α-Interferon
• (C) Human protein - α-Antitrypsin
• (D) Human α-Lactalbumin

Homeostasis is a condition where the organisms:

• (A) Maintain a constant internal environment in an ever-changing external environment
• (B) Do not maintain a constant internal environment
• (C) Change their internal environment according to their external environment
• (D) Change their internal environment when the external environment is constant

Which of the following is not a parasitic adaptation?

• (A) Loss of unnecessary sense organs
• (B) Absence of adhesive organs or suckers
• (C) Loss of digestive system
• (D) High reproductive capacity

DNA polymerase of Thermus aquaticus is:

• (A) Thermolabile
• (B) Thermophobic
• (C) Exonuclease
• (D) Thermostable

If a recombinant DNA bearing a gene for resistance to Ampicillin is transferred into E.coli cells, host cells become transformed into Ampicillin-resistant cells. What happens when these E.coli are grown on a medium containing Ampicillin?

• (A) Non-transformants will grow and transformants will die
• (B) Non-transformants will die and transformants will grow
• (C) Both non-transformants and transformants will die
• (D) Both non-transformants and transformants will grow

Which of the following is based on the principle of antigen-antibody interaction?

• (A) PCR
• (B) ELISA
• (C) rDNA technology
• (D) Gel Electrophoresis

A strict protection of biodiversity hotspots could reduce the ongoing mass extinction by almost:

• (A) 20%
• (B) 25%
• (C) 30%
• (D) 35%

Identify the incorrect match with respect to recently extinct animals and their place of extinction according to the IUCN Red List:

• (A) Dodo - Mauritius
• (B) Quagga - Africa
• (C) Thylacine - Australia
• (D) Steller's Sea Cow - North America

According to the hypothesis proposed by environmental biologists, a relatively constant environment in tropics promotes:

• (A) Niche specialization and lesser species diversity
• (B) Niche specialization and greater species diversity
• (C) Niche diversity and lesser species specialization
• (D) Niche diversity and greater species specialization

In the prevention of air pollution, the role of a scrubber is to remove:

• (A) Particulate SO₂
• (B) Liquid SO₂
• (C) Gaseous SO₂
• (D) Liquid SO₃

Match List-I with List-II and choose the correct answer.

List-I:

1) Nitrogen rich fertilizers

2) Carbon dioxide

3) Carbon monoxide

4) CFC's

List-II:

p) Ozone depletion

q) Eutrophication

r) Greenhouse effect

s) Air pollutant

• (A) 1-p, 2-q, 3-r, 4-s
• (B) 1-q, 2-r, 3-s, 4-p
• (C) 1-r, 2-s, 3-p, 4-q
• (D) 1-s, 2-p, 3-q, 4-r

Following representations P, Q, and R denote a few steps of Griffith's Experiment. Identify the correct one(s).

Steps:

P. R strain → Inject into mice → Mice die

Q. S strain (Heat killed) → Inject into mice → Mice die

R. R strain → Inject into mice → Mice live

• (A) P only
• (B) R only
• (C) P and R
• (D) Q and R

In tRNA, the region that binds with mRNA is:

• (A) Anticodon loop of tRNA
• (B) Amino acid acceptor end of tRNA
• (C) Amino acyl synthetase loop of tRNA
• (D) Ribosomal binding loop of tRNA

The mRNA has Untranslated Regions (UTRs):

• (A) At 3' -end beyond Terminator codon
• (B) At 5' -end before AUG
• (C) At both 3' -end and 5' -end beyond Terminator codon and before AUG respectively
• (D) AUG and Terminator codon flank the UTR

In a structural gene, the template DNA strand has nucleotide sequences: 3' ATGCATGCATGCATGC 5'. Find the correct and complementary nucleotide sequence on the coding strand.

• (A) 5' ATGCATGCATGCATGC 3'
• (B) 3' GCATGCATGCATGCAT 5'
• (C) 5' TACGTACGTACGTACG 3'
• (D) 3' TACGTACGTACGTACG 5'

Read the following statements:
Statement I: All vertebrates develop a row of vestigial gill slits during the embryonic stage.
Statement II: Embryos always pass through the adult stages of other animals.
Which of the following options is correct with reference to these statements?

• (A) Statement I is correct, Statement II is incorrect.
• (B) Statement I is incorrect, Statement II is correct.
• (C) Both Statements I and II are correct.
• (D) Both Statements I and II are incorrect.

Which of the following exhibits a haplodiplontic lifecycle?

• (A) Fucus
• (B) Chlamydomonas
• (C) Gelidium
• (D) Ectocarpus

Identify the phylum which shows the following characteristics:
1. Animals are exclusively marine, radially symmetrical, and diploblastic.
2. Body bears eight external rows of ciliated comb plates which help in locomotion.
3. Digestion is both extracellular and intracellular.
4. Reproduction only by sexual modes.

• (A) Coelenterata
• (B) Mollusca
• (C) Arthropoda
• (D) Ctenophora

When a flower has both stamens and carpels, it is described as:

• (A) Asexual
• (B) Unisexual
• (C) Bisexual
• (D) Dioecious

Ciliated epithelial cells are present in:

• (A) Kidneys
• (B) Intestines
• (C) Blood Vessels
• (D) Bronchioles

Which of the following statements is correct with reference to vacuoles?

• (A) It is membrane bound and contains storage proteins and lipids.
• (B) It is membrane bound and contains water and excretory substances.
• (C) It lacks membrane and contains air.
• (D) It lacks membrane and contains water and excretory substances.

Exoskeleton of Arthropods is made up of a unique complex polysaccharide known as:

• (A) Hyaluronic Acid
• (B) Chitin
• (C) Waxes
• (D) Cellulose

The enzyme Recombinase is required at which stage of Meiosis I?

• (A) Pachytene
• (B) Zygotene
• (C) Diplotene
• (D) Diakinesis

The water potential of pure water is:

• (A) One
• (B) More than one
• (C) Zero
• (D) Less than zero

Match the pigments given in List I with their colour in the chromatogram given in List II.

List I (Pigments):

1. Chlorophyll 'b'

2. Carotenoids

3. Chlorophyll 'a'

4. Xanthophylls

List II (Colour in chromatogram):

p. Yellow orange

q. Orange red

r. Yellow

s. Blue green

t. Yellow green

• (A) 1-s, 2-t, 3-r, 4-q
• (B) 1-t, 2-p, 3-s, 4-r
• (C) 1-p, 2-q, 3-r, 4-t
• (D) 1-t, 2-p, 3-r, 4-s

Which is the intermediate compound that links the end product of Glycolysis with TCA Cycle?

• (A) Acetyl CoA
• (B) Pyruvic Acid
• (C) OAA
• (D) Citric Acid

Auxins : Apical dominance :: Gibberellins : ________

• (A) Adventitious shoot formation
• (B) Accelerates abscission
• (C) Closure of stomata
• (D) Bolting

The term Uremia refers to:

• (A) Accumulation of Urea in blood.
• (B) Presence of Glucose in the urine.
• (C) Accumulation of Uric acid in blood.
• (D) Accumulation of Uric acid in kidneys.

The typical 'lub-dub' sounds heard during heartbeat are produced due to:

• (A) Closure of semilunar valves
• (B) Closure of bicuspid and tricuspid valves
• (C) Closure of bicuspid and tricuspid valves followed by semilunar valves
• (D) Opening of bicuspid and tricuspid valves followed by semilunar valves

The functional unit of contraction is a:

• (A) Portion of myofibril between two successive Z-lines
• (B) Portion of myofibril between two successive M-lines
• (C) Centre of the H-zone
• (D) Centre of the I-band

Match the parts of the brain given in List I with their functions given in List II.

List I: (Parts of the brain)

1. Medulla oblongata

2. Hypothalamus

3. Cerebral cortex

4. Limbic system

List II: (Functions)

p. Body temperature

q. Olfaction

r. Respiration

s. Motor function

• (A) 1-p, 2-r, 3-s, 4-q
• (B) 1-q, 2-s, 3-r, 4-p
• (C) 1-s, 2-p, 3-q, 4-r
• (D) 1-r, 2-p, 3-s, 4-q

Hydra reproduces asexually by producing:

• (A) Zoospores
• (B) Conidia
• (C) Buds
• (D) Gemmule

When male and female gametes are morphologically distinct, the condition is known as:

• (A) Homogametes
• (B) Heterogametes
• (C) Hermaphrodites
• (D) Sexual Dimorphism

The role of Filiform apparatus in synergids is to:

• (A) Protect the egg apparatus
• (B) Endosperm formation
• (C) Guide the entry of pollen tube
• (D) Prevention of gamete entry

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:

• (A) Xenogamy
• (B) Autogamy
• (C) Cleistogamy
• (D) Geitonogamy

Match the content of List I with List II:

List I:

1. Polyembryony

2. Perisperm

3. False fruit

4. Parthenocarpy

List II:

p. Black pepper

q. Banana

r. Lemon

s. Apple

• (A) 1-r, 2-p, 3-s, 4-q
• (B) 1-p, 2-r, 3-s, 4-q
• (C) 1-q, 2-p, 3-s, 4-r
• (D) 1-r, 2-s, 3-p, 4-q

Which of the following hormones is not secreted by human placenta?

• (A) Progestogen
• (B) HCG
• (C) Estrogen
• (D) LH

In human females, the endometrium of the uterus consists of:

• (A) Smooth muscle
• (B) Glandular layer
• (C) Adipose layer
• (D) Cartilaginous layer

If two primary spermatocytes and two primary oocytes undergo meiosis simultaneously, what will be the ratio of spermatozoa and ova produced at the end of gametogenesis?

• (A) 2:1
• (B) 4:1
• (C) 6:2
• (D) 1:2

The Government of India legalized MTP with some strict regulations in the year:

• (A) 1951
• (B) 1961
• (C) 1971
• (D) 2001

The process in which a small part of the vas deferens is removed or tied up through a small incision, is called:

• (A) MTP
• (B) Vasectomy
• (C) Tubectomy
• (D) GIFT

Test cross in pea plant is:

• (A) A cross between F2 tall plant and recessive parent.
• (B) A cross between F2 dwarf plant and recessive parent.
• (C) A cross between F2 tall plant with dominant parent.
• (D) A cross between two F1 plants.

The genotype ratio of incomplete dominance is:

• (A) 3:1
• (B) 1:2:1
• (C) 1:1:2
• (D) 9:3:3:1

Find the incorrect statement among the following:

• (A) In sex-linked recessive traits, the gene is transmitted from an unaffected carrier female to some of the male progeny.
• (B) Accumulation of phenylpyruvic acid in the brain results in mental retardation.
• (C) Individuals affected by Down's Syndrome will have congenital heart defects and are more intelligent.
• (D) Turner's Syndrome is caused due to the absence of one X chromosome.

In a dihybrid cross between a true breeding round yellow seeded and true breeding wrinkled green seeded pea plant, the ratio of segregation of round and wrinkled seed traits in F2 is:

• (A) 9:1
• (B) 3:1
• (C) 9:3
• (D) 3:3

Stanley Miller simulated the conditions of pre-biotic Earth using a spark-discharge apparatus. Which organic compounds were observed by him on analyzing the end product of his experiment?

• (A) Pigments
• (B) Fats
• (C) Nitrogen bases
• (D) Amino acids

The most ape-like ancestral primate was:

• (A) Dryopithecus
• (B) Ramapithecus
• (C) Australopithecus
• (D) Neanderthal man

The principle of vaccination is based on which property of the immune system?

• (A) Memory
• (B) Specificity
• (C) Diversity
• (D) Plasticity

The genome of HIV replicates in the macrophages with the help of an enzyme called:

• (A) DNA Polymerase
• (B) RNA Polymerase
• (C) Reverse Transcriptase
• (D) DNA Ligase

Read the following statements:
Statement I: Morphine is obtained by acetylation of Heroin.
Statement II: Cannabinoids are known for their effect on the cardiovascular system.
Which of the following options is correct with reference to these statements?

• (A) Both Statements I and II are correct.
• (B) Statement I is correct and Statement II is incorrect.
• (C) Statement I is incorrect and Statement II is correct.
• (D) Both Statements I and II are incorrect.

Mule is the result of:

• (A) Out-crossing
• (B) Cross-breeding
• (C) Interspecific hybridization
• (D) Out-breeding

Identify the bacterial disease among the following:

• (A) Brown rust of wheat
• (B) Tobacco mosaic disease
• (C) Black rot of crucifers
• (D) Late blight of potato

Match the nutrients given in List-I with the source in List-II:

List-I:

1. Vitamin A

2. Single cell protein

3. Vitamin C

4. Protein

List-II:

p. Bitter gourd

q. Beans

r. Carrots

s. Spirulina spp

• (A) 1-p, 2-q, 3-r, 4-s
• (B) 1-r, 2-s, 3-p, 4-q
• (C) 1-p, 2-r, 3-s, 4-q
• (D) 1-q, 2-s, 3-p, 4-r

The chemical substances produced by some microbes which can kill or retard the growth of other microbes are known as:

• (A) Statins
• (B) Streptokinases
• (C) Cyclosporins
• (D) Antibiotics

Select the correct statement from the following:

• (A) *Methanobacterium* is an aerobic bacterium found in the rumen of cattle.
• (B) Biogas is produced by the activity of aerobic bacteria.
• (C) Biogas is pure methane.
• (D) Activated sludge in sediment tanks is a rich source of aerobic bacteria.

Which of these enzymes is required to cleave a plasmid?

• (A) Ligase
• (B) Endonuclease
• (C) Exonuclease
• (D) Polymerase

The natural reservoir of phosphorus is:

• (A) Rocks
• (B) Soil solution
• (C) Detritus
• (D) Atmosphere

The sequence of communities of primary succession in water is:

• (A) Phytoplanktons → Scrubs → Free floating hydrophytes → Rooted hydrophytes → Grasses → Trees.
• (B) Phytoplanktons → Free floating hydrophytes → Rooted hydrophytes → Trees → Scrubs.
• (C) Free floating hydrophytes → Scrubs → Phytoplanktons → Rooted hydrophytes → Grasses → Trees.
• (D) Phytoplanktons → Rooted hydrophytes → Free floating hydrophytes → Reed swamps → Marsh meadows → Scrubs → Trees.

Match the type of adaptation given in List-I with their examples given in List-II:

List-I (Types of adaptation):

1. Biochemical adaptation

2. Behavioural adaptation

3. Physiological adaptation

4. Morphological adaptation

List-II (Examples):

p. Desert lizards

q. Deep sea fishes

r. *Opuntia*

s. Kangaroo rats

• (A) 1-q, 2-r, 3-s, 4-p
• (B) 1-p, 2-q, 3-r, 4-s
• (C) 1-q, 2-p, 3-s, 4-r
• (D) 1-s, 2-r, 3-q, 4-p

The annual net primary productivity of the biosphere is approximately:

• (A) 170 billion tons
• (B) 55 billion tons
• (C) 170 million tons
• (D) 55 million tons