10th Biology Quiz 1

Application of Abscisic acid on plants promotes :

(A) Development of fruits

(B) Wilting of leaves

(C) Elongation of stem

(D) Formation of flowers

B

The valves in the human heart ensure that :

(i) Oxygen-rich blood flows from left atrium to left ventricle only.

(ii) Deoxygenated blood flows from left atrium to left ventricle only.

(iii) Oxygen-rich blood flows from right atrium to right ventricle only.

(iv) Deoxygenated blood flows from right atrium to right ventricle only.

(A) (i) and (iii)

(B) (ii) and (iv)

(C) (i) and (iv)

(D) (ii) and (iii)

C

The part of the hindbrain present immediately above the medulla is :

(A) Cerebellum

(B) Pons

(C) Cerebrum

(D) Spinal cord

B

In garden pea, violet colour flower is the dominant trait over white colour

flower which is the recessive trait. When parent plant with violet coloured

flowers (Vv) is crossed with a parent plant with white flowers, the possible

percentage of occurrence of traits in the F1 progeny would be :

(A) 100% violet

(B) 50% violet, 50% white

(C) 25% violet, 75% white

(D) 75% violet, 25% white

B

The end product of meiosis in a reproductive cell in plants is :

(A) Zygote

(B) Pollen grains

(C) Sperms

(D) Egg

B

The organism occupying the fourth trophic level in a food chain operating

in grassland is :

(A) Green plants

(B) Frog

(C) Grasshopper

(D) Snake

D

In an ecosystem, 10% of energy available for transfer from one trophic

level to the next in a food chain is in the form of :

(A) heat energy (B) chemical energy

(C) mechanical energy (D) light energy

B

Assertion (A) : Transpirational pull helps in the absorption and upward

movement of water and dissolved minerals in plants.

Reason (R) : The effect of root pressure in transport of water is more

significant at night.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the

correct explanation of Assertion (A).

(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not

the correct explanation of Assertion (A).

(C) Assertion (A) is true, but Reason (R) is false.

(D) Assertion (A) is false, but Reason (R) is true

B

Assertion (A) : Decomposition of vegetable matter into compost is an

exothermic reaction.

Reason (R) : Decomposition reactions need energy to break down the

reactants
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the

correct explanation of Assertion (A).

(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not

the correct explanation of Assertion (A).

(C) Assertion (A) is true, but Reason (R) is false.

(D) Assertion (A) is false, but Reason (R) is true

B

Breakdown of proteins in the stomach takes place by the enzyme :

(A) Trypsin (B) Lipase

(C) Salivary Amylase (D) Pepsin

D

The unit of heredity is :

(A) Chromosome (B) Chromatin

(C) Gene (D) DNA

C

The chlorophyll in photosynthesis is used for

A. Absorbing light

B. Breaking down water molecule

C. No function

D. Reduction of CO₂

A

Proteins after digestion are converted into
A. Carbohydrates
B. Small globules
C. Amino acids
D. starch

C

Carbohydrates in the plants are stored in the form of
A. Glycogen
B. Starch
C. Glucose
D. Maltose

B

Main site of photosynthesis
A. Leaf
B. Stem
C. Chloroplast
D. Guard cells

C

The small pores present of leaf’s surface are called
A. Stomata
B. Chlorophyll
C. Guard cells
D. None of these

A

Photosynthesis is a
A. Catabolic process
B. Parabolic process
C. Amphibolic process
D. Photochemical process

D

Opening and closing of pores is a function performed by
A. Stomata
B. Chlorophyll
C. Chloroplast
D. Guard cells

D

Which element is used in the synthesis of proteins?
A. Hydrogen
B. Oxygen
C. Nitrogen
D. Carbon dioxide

C

Temporary finger like extensions on amoeba are called
A. Cell membrane
B. Cell wall
C. Pseudopodia
D. Cilia

C

Bile juice is secreted by
A. Stomach
B. Pancreas
C. Small intestine
D. Liver

D

Which of these juices is secreted by pancreas?
A. Trypsin
B. Pepsin
C. Bile juice
D. Both A and B

A

Lipase acts on
A. Amino acids
B. Fats
C. Carbohydrates
D. All of these

B

Respiratory pigment in human body is
A. Chlorophyll
B. Water
C. Blood
D. haemoglobin

D

Blood consist of what fluid medium?
A. Lymph
B. Platelets
C. Plasma
D. All of these

C

One cell-thick vessels are called
A. Arteries
B. Veins
C. Capillaries
D. Pulmonary artery

C

The two oviducts in a human female unite into an elastic bag like is known as
A. Vagina
B. Uterus
C. Fallopian tube
D. Cervix

B

Which of the following disease is transmitted sexually?
A. Kala azar
B. Jaundice
C. Cholera
D. Syphilis

D

When a animal is cut into pieces and each piece grows into a complex organism. What is the process?
A. Budding
B. Fragmentation
C. Spore formation
D. Regeneration

D

Which is the portion on which grafting is done it provides the roots?
A. Stock
B. Scion
C. Both a and b
D. None of these

A

Growing foetus derive nutrition from mother’s blood through
A. Uterus
B. Fallopian tube
C. placenta
D. cervix

C

What is the puberty age in human males?
A. 8-10
B. 10-12
C. 12-14
D. 14-16

C

Fruits are formed from
A. Stamen
B. Stigma
C. Ovary
D. Ovule

C

Which of the following is totally impossible outcome of Mendel’s Experiment?
A. 3 tall 1 short plant
B. 24 tall and 8 short plants
C. 8 tall and 0 short plants
D. 4 tall plants and 1 medium height plant.

D

Which of the following is not a direct conclusion that can be drawn from Mendel’s Experiment?
A. Only one parental trait is expressed
B. Two copies of each trait is inherited in sexually reproducing organism
C. For recessive trait to be expressed, both copies should be identical
D. Natural selection can alter frequency of an inherited trait.

D

Which one is a possible progeny in F2 generation of pure bred tall plant with round seed and short plant with wrinkled seeds?
A. Tall plant with round seeds
B. Tall plant with wrinkled seeds
C. Short plant with round seed
D. All of the above

D

Which section of DNA provides information for one protein
A. Nucleus
B. Chromosomes
C. Trait
D. Gene

D

What is the probability that the male progeny will be a boy?
A. 50%
B. 56%
C. 47.43%
D. It varies

A

Who have a perfect pair of sex chromosomes?
A. Girls only
B. Boys only
C. Both girls and boys
D. It depends on many other factors

A

With whom you can associate theory of evolution?
A. Charles Darwin
B. Mendel
C. Stanley miller
D. Harold Urey

A

Which of the following can be called a characteristic?
A. Plants can photosynthesis
B. We have 2 eyes
C. Mango tree is multicellular
D. All of these

D

Homologous organ have
A. Same structure, same function
B. Different structure, different function
C. Same structure, different function
D. different structure, same function

C

Which of the following is a biodegradable substance?
A. Glass
B. Plants
C. Plastics
D. Polythene

B

Which of the following is a non-biodegradable substance?
A. Virgin plastic
B. Plastic
C. Plants
D. Plant producers

B

The constituents which do not form eco-system are
A. Biotic constituents
B. Plastic bags
C. Abiotic constituents
D. All of these

B

The functional unit of environment is
A. Ecosystem
B. Nitrogen
C. Carbon
D. Oxygen

A

Which of the following is an example of producers?
A. Plastic pens
B. Plastic cans
C. Polythene
D. Green plants

D

Which of the following is an example of herbivores?
A. Cow
B. Shark
C. Lion
D. Tiger

A

Which of the following is an not example of abiotic factors?
A. Light
B. Plants
C. Heat
D. Temperature

_______ is not a biodegradable pollutant.
A. Paper
B. Cotton cloth
C. Cotton
D. DDT

D

Which of the following is terrestrial ecosystem?
A. A natural forest
B. A lake
C. A pond
D. An aquarium

A

_______ is an omnivore animal.
A. Lion
B. Hawk
C. Jackal
D. Man

D

The formula of Ozone is _______
A. O3
B. O2
C. O4
D. O6

A

Which of the following is a green house gas?
A. Nitrogen dioxide
B. Sulphur dioxide
C. Carbon dioxide
D. Carbon monoxide

A

Floods can be prevented by
A. Afforestation
B. Removing top soil
C. Deforestation
D. Agriculture

A

Narmada bachao andolan was to
A. Clean narmada
B. Expand narmada
C. Save narmada
D. None of above

C

Synthetic material/ chemical which depleted Ozone layer is
A. CFCs
B. CFLs
C. CO 2
D. None of above

A

Why should we conserve forest and wild life?
A. To protect biodiversity
B. To maintain ecosystem
C. To maintain balance
D. To continue food chain

D

Water harvesting is a method which
A. Increase ground water level
B. Not practiced in modern days
C. Has no relation with ground water
D. Decrease ground water level

A

What is the functional unit of the kidney?
A. Glomerulus
B. Nephron
C. Alveolus
D. Neuron

B

Which of the following is a plant hormone?
A. Thyroxine
B. Adrenaline
C. Insulin
D. Auxin

D

What is the primary function of red blood cells?
A. Transport oxygen
B. Fight infections
C. Clot blood
D. Produce hormones

A

Which organ in humans produces insulin?
A. Kidney
B. Pancreas
C. Thyroid
D. Liver

B

What pigment gives plants their green color?
A. Chlorophyll
B. Xanthophyll
C. Carotene
D. Hemoglobin

D

What is the function of the reflex arc?
A. Process complex thoughts
B. Control hormone secretion
C. Regulate blood pressure
D. Provide immediate response to stimuli

B

What is the male gamete in plants?
A. Seed
B. Pollen grain
C. Ovule
D. Sperm

B

What does the human brain’s cerebrum control?
A. Breathing
B. Digestion
C. Voluntary actions
D. Heartbeat

C

Which vitamin is essential for blood clotting?
A. Vitamin K
B. Vitamin C
C. Vitamin A
D. Vitamin D

A

Which of the following is an example of a homologous organ?
A. Wings of birds and insects
B. Flippers of whales and arms of humans
C. Tail of monkeys and humans
D. Eyes of octopus and humans

B

What determines the sex of a human baby?
A. Mitochondria
B. Cytoplasm
C. Autosomes
D. X and Y chromosomes

D

Which hormone regulates blood sugar levels?
A. Thyroxine
B. Adrenaline
C. Insulin
D. Oxytocin

C

What is a food chain?
A. A diagram of all species in an ecosystem
B. A sequence of organisms eating one another
C. A series of interlinked habitats
D. A cycle of decomposers and producers

B

What is the term for organisms that make their own food?
A. Consumers
B. Decomposers
C. Scavengers
D. Producers

D

What is the role of villi in the small intestine?
A. Absorb nutrients
B. Digest proteins
C. Absorb water
D. Neutralize acids

A

What process converts glucose to energy in cells?
A. Photosynthesis
B. Transpiration
C. Cellular respiration
D. Digestion

C

What is the primary function of stomata in plants?
A. Absorb nutrients
B. Exchange gases
C. Capture light
D. Store water

B

Which method of reproduction is common in yeast?
A. Binary fission
B. Spore formation
C. Fragmentation
D. Budding

D

What are life processes?
A. Activities performed by plants only
B. Activities performed by machines
C. Essential activities performed by living organisms
D. Chemical reactions in non-living things

C

Which of the following is an example of asexual reproduction?
A. Binary fission
B. Fertilization
C. Copulation
D. Pollination

A

What is a dominant trait?
A. Trait expressed in a recessive condition
B. Trait expressed in a heterozygous condition
C. Trait that disappears
D. Trait that is not expressed

B

What are decomposers?
A. Organisms that break down dead matter
B. Organisms that produce oxygen
C. Consumers of energy
D. Producers in the ecosystem

A

What is the site of gas exchange in human lungs?
A. Trachea
B. Diaphragm
C. Bronchi
D. Alveoli

D

What prevents food from entering the windpipe during swallowing?
A. Epiglottis
B. Larynx
C. Trachea
D. Esophagus

A

Which blood vessel carries oxygenated blood to the heart?
A. Aorta
B. Vena cava
C. Pulmonary vein
D. Pulmonary artery

C

Which plant hormone promotes fruit ripening?
A. Cytokinin
B. Ethylene
C. Auxin
D. Gibberellin

B

Which of the following is a bisexual flower?
A. Maize
B. Papaya
C. Coconut
D. Hibiscus

D

What is biomagnification?
A. Increasing oxygen levels
B. Breaking down waste materials
C. Accumulation of harmful substances in food chains
D. Enhancing soil fertility

C

What is the function of dendrites in a neuron?
A. Provide energy to the cell
B. Insulate the axon
C. Transmit impulses away from the cell body
D. Receive impulses from other neurons

D

Which law of Mendel states that traits are inherited independently?
A. Law of Independent Assortment
B. Law of Dominance
C. Law of Segregation
D. Law of Genetics

B

What is the DNA shape called?
A. Helix
B. Spiral
C. Ladder
D. Double helix

D

What is the primary source of energy in an ecosystem?
A. Plants
B. Water
C. Sunlight
D. Soil

C

Which of the following is an adaptation in plants for gaseous exchange during photosynthesis?
A. Thick cuticle
B. Sunken stomata
C. Lenticels
D. Guard cells

D

Which of the following is NOT a feature of anaerobic respiration?
A. Produces less energy compared to aerobic respiration
B. Generates water as a byproduct
C. Produces ethanol or lactic acid
D. Occurs in the absence of oxygen

B

In a dihybrid cross, what is the phenotypic ratio observed in the F2 generation?
A. 3:1
B. 2:1
C. 9:3:3:1
D. 1:2:1

C

Why are food webs more stable than food chains?
A. They provide alternate pathways for energy flow
B. They involve only primary consumers
C. They are linear
D. They eliminate decomposers

A

Which molecule acts as the primary energy currency in the cell?
A. NADH
B. ADP
C. Glucose
D. ATP

D

What is the function of the myelin sheath in a neuron?
A. To produce action potentials
B. To receive signals from other neurons
C. To insulate the axon and speed up signal transmission
D. To store neurotransmitters

C

Which part of the flower produces male gametes?
A. Stigma
B. Anther
C. Ovule
D. Sepal

C

What are alleles?
A. Proteins encoded by DNA
B. Different chromosomes in a cell
C. Segments of non-coding DNA
D. Different forms of the same gene

B

Select the correct statements from the following about the

human heart :

(i) Right atrium receives oxygenated blood from lungs

through pulmonary artery.

(ii) Right atrium receives deoxygenated blood through vena

cava from upper and lower body.

(iii) Left atrium transfers oxygenated blood to left ventricle

which sends it to various parts of the body.

(iv) Left atrium transfers oxygenated blood to aorta which

sends it to various parts of the body.

(A) (i) and (ii)

(B) (ii) and (iii)

(C) (iii) and (iv)

(D) (i) and (iv)

D