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Class 11

Biology

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Question Answers for Class 11 Biology

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Question Answers for Class 11 Biology by Vedantu are created by experts to help you excel in your board exams. These answers cover all the key questions from the CBSE Biology syllabus and explain every concept in a simple and easy-to-understand way.

What makes Vedantu’s solutions special is their step-by-step approach, which simplifies even the toughest topics. This helps you learn better, improve your problem-solving skills, and feel more confident about your exams.

These solutions follow the CBSE curriculum closely, making them a reliable resource for thorough preparation and building a solid understanding of Biology.

Class 11 Biology Question Answers

Sonar system is found inA) OtterB) BatC) WhaleD) Both B and C

Incomplete alimentary canal occurs inA) FasciolaB) AscarisC) WuchereriaD) Rhabditis

In earthworm typhlosole occurs betweenA. 20 - 90 SegmentsB. 26 - 95 segmentsC. 20 - 95 segmentsD. 21 - 100 segments

Animal cells areA. Round and irregular in shapeB. Round or rectangular in shapeC. Regular and rectangular in shapeD. Irregular and square in shape

What are the possible advantages and disadvantages of a chitinous exoskeleton in arthropods?

What are the aquaporins in the facilitated diffusion process?A. Membrane proteinsB. Carrier proteinsC. Channel proteinsD. Carrier lipids

ATPase enzyme needed for muscle contraction is located in(a) Actinin(b) Troponin(c) Myosin(d) Actin

All of the following statements are false about red blood cells that have been added to a flask of saturated NaCl solution except thatA. The cells will undergo mitosisB. The cells will increase in volumeC. The cell will lose waterD. The cells are hypertonic relative to the surrounding mediumE. The concentration of NaCl is tower outside the cells than inside

An ecosystem undergoes a sudden drastic change that now favors organisms with an extreme phenotype.Which one of the following is true for such an ecosystem?A.Genetic driftB.Founder effectC.Artificial selectionD.Disruptive selectionE.Directional selection

What are antibiotics? A. Medicine taken for AIDSB. Medicine taken to kill or stop the growth of harmful or disease-causing microbes inC. Medicine taken for viral infection D. Medicines taken for malaria

..... are rich in vitamins.

A plant having hypanthodium inflorescence is? A.Yucca B.Pyrus C.Salvia D.Ficus

Areolar tissue joinsA. Integument with musclesB. Bones with musclesC. Bone with boneD. Fat body with muscles

Alary muscles of cockroach are associated or connected with(a) Trachea(b) Heart(c) Legs(d) Alimentary canal

A sectional view of the mammary gland shows (i) Nipple and Areola (ii) Mammary lobe Alveolus and Duct (iii) Antibodies Pectoralis major muscles and Ribs(iv) Ampulla and Lactiferous duct A. (i) (ii) and (iv) B. (i) (ii) and (iii) C. (iii) and (iv) D. (i) (ii) (iii) and (iv)

A randomly selected group of organisms from a family would show more genetic variation than a randomly selected group from a A. Genus B. KingdomC. Class D. Phylum

A tumor in the adrenal zona glomerulosa can cause hypersecretion of hormones produced in that region. Which of the following might you expect to find in a patient with such a tumor?a) Increased blood sodium levelsb) Increased blood glucose levelsc) Decreased blood calcium levelsd) Increased dehydration

How is ATP synthesis in photosynthesis different from that of respiration?

How are sieve tubes different from sieve cells?A. Being shorterB. Being dead C. Lacking Nuclei D. Having sieve pores at end walls

Arrange the following in a logical sequence.Renal veins Renal arteries afferent arteriole Efferent arteriole Glomerulus(pathway of blood through the glomerulus).

What are beta cells of pancreas?

A nail is driven in a stem of mango tree 2 meter above the ground. How much height is attained by nail after 5 yearsA)3 metersB)5 metersC)10 metersD)Nail remains at same height i.e. at 2 meters

______and ______pairs of ribs are called floating ribs.

Why are viruses considered as being the borderline between living and non-living things?

........ are good sources of oxygen for those organisms that live in water. A.Moss B.Mushroom C.Sea urchin D.Algae

Arboretum isA. A forest patchB. A piece of social forestryC. Botanical garden with treesD. Botanical garden with cacti and herbs

Name the Largest and the Smallest Cell in the Human Body ?

About 90% of total photosynthesis in the world is caused byA. BryophytesB. AlgaeC. PteridophytesD. Angiosperms

3F gland isA) Adrenal B) Thyroid C) Gonadal D) Pancreas

Abnormal secondary growth is observed in A. DracaenaB. WheatC. GingerD. Rice

Aggregate fruit develops from a single flower witha. Free ovariesb. Fused ovariesc. Non functional ovariesd. Transversely arranged ovaries

What is an abscission zone? Name its components and their functions.

ADH acts on(a)Loop of Henle(b)Collecting tubule(c)Vasa efferentia(d)Vasa deferentia

When a cell is placed in a hypotonic solution(a)solute exists in the cell to equalize the concentration on both sides of the membrane.(b)water exits the cell towards an area of lower solute concentration.(c)water enters the cell toward the area of higher solute concentration.(d)solute exists and water enters the cell.

Adenine pentose sugar and single phosphate combine to formA) AdenosineB) Adenylic acidC) Adenosine diphosphateD) Adenosine triphosphate

Give examples for ammonifying bacteria.

Agar-agar is obtained fromA. ChlorellaB. SpirogyraC. UlothrixD. Gelidium

Abnormal\/anomalous secondary growth occurs in(a) Dracaena(b) Ginger(c) Wheat(d) Sunflower

According to five kingdom system blue-green algae belong to:a) Metaphyta b) Monera c) Protista d) Algae

According to _____________ protoplasm is the physical basis of life.

According to the modern concept cell membrane is A) Solid B) Quasi FluidC) FluidD) Solidified sheath

According to the IUCN Red List what is the status of Red Panda(Ailurus fulgens)?(a) Critically endangered(b) Endangered species(c) Vulnerable species(d) Extinct species

Active and passive transports across cell membrane differ inA. Passive transport is non-selective.B. Passive transport is along the concentration gradient while active transport is due to metabolic energy.C. Active transport is more rapid.D. Passive transport is confined to anions while active transport is confined to cations.

Abscisic acid causesA. Faster leaf fallB. Dormancy of buds and seedsC. Retardation of growth D. All of the above

A component of cytoskeleton isA. MicrotubuleB. BoneC. ChitinD. Cartilage

A compound leaf with more than three pinnate nature is (a) Multifoliate (b) Decompound(c) Quadrifoliate(d) Tripinnate

A greater scattering of light in a bacterial sample when measured by UV spectrophotometer indicatesA. Decreased bacterial growthB. Greater bacterial growthC. Stable Bacterial growthD. None of the above

Agar-agar commonly used in bacterial cultures and medication is obtained fromA. SargassumB. GelidiumC. UlothrixD. Ulva

Advantage of cleistogamy is A. Higher genetic variability. B. More vigorous offspring. C. No dependence on pollinators. D. Vivipary

A fruit has fleshy mesocarp and stony endocarp is(A) Pome(B) Berry(C) Pepo(D) Drupe

A drop in temperature does affect spermatogenesis.Reason: during the temperature drop the smooth muscle contracts and brings the testes closer to the pelvic cavity.A. Both assertion and reason are correct and the reason is the correct explanation for the assertion.B. Both assertions and the reason are correct but the reason is not the correct explanation for the assertion.C. The assertion is correct but the reason is incorrect.D. Both assertion and reason are incorrect.

(a) Draw a labelled diagram of the human heart.(b) What is the use of platelets in the maintenance of human beings?(c) Which respiratory pigment is found in red blood corpuscles found in human blood?

According to Engler and Prantl the angiosperms were directly derived from:a. Gymnospermsb. Bryophytesc. Pteridophytesd. Proto-angiosperms (hypothetical)

A common cloacal aperture is found in (A) Rana (B) Nereis(C) Rabbit(D) Pheretima.

Actin binding sites are located overa. Troponinb. Tropomyosinc. Meromyosind. Creatininee. Both A and B

Adenoids are functional up to the age of(a) 4 years(b) 10 years(c) Adolescence(d) 20 years

Acoelomate animal with protandrous nature is(a)Ascaris(b)Schistosoma(c)Taenia(d)Megascolex

A bacterial cell undergoes binary fission every twenty minutes. Starting with a single bacterium how many bacteria will form after 3 hours?a. 128b. 256c. 512d. 1024

According to Susruta Samhita Virudha consisted ofA. Flowering plants.B. Shrubs.C. Osadhi.D. Jangama.

Active transport of ions by a cell requires A) High temperature B) Low temperature C) Alkaline pH D) ATP

Adenosine monophosphate is aA) Nucleoside of DNAB) Nucleotide of DNAC) Nucleoside of RNAD) Nucleotide of RNA

A Dorsiventral leaf has a. Palisade tissue on both sides b. Spongy tissue on both sides c. Palisade tissue on upper side and spongy tissue on lowerd. Spongy tissue on upper side and palisade tissue on lower

After mitosis the chromosome number of a daughter cell is….that of parent cells.A. Doubled compared toB. One- halfC. The same asD. Rearranged compared to

According to modern theory of stomatal opening proposed by Levitt pH of guard cell can rise due to –A. CO2 assimilation by guard cells onlyB. Active efflux of H+ ions by guard cellsC. Conversion of starch into PEPD. Active uptake of K+ in guard cells

Accumulation of cells and formation of a bud at the site of amputation isA.MorphallaxisB.Reparative budC.BlastemaD.Both A and b

A glass dome covering an area of 3.5 acres with 4000 representatives of most ecosystems and eight human beings in order to prepare a prototype of space colony is A. Glass houseB. PhytotronC. Biosphere 1D. Biosphere 2

A condition in which the body's internal environment remains relatively constant within limits is(a) Hematoma(b) Haemopoiesis(c) Homeostasis(d) Hemostasis

After ovulation in a female mammal the structure which is formed by the ruptured follicle isA. Corpus LuteumB. Graafian follicleC. PlacentaD. Epididymis

About how much saliva does a person produce in an entire day?a. 100 mlb. 250 mlc. 500 mld. 1500 ml

70S type of ribosomes are found inA. Prokaryotic cellsB. Prokaryotic cells and chloroplastC. MitochondriaD. Nucleus mitochondria

A boy was invited by his friend to a party and he ate a variety of foodstuffs. On reaching home he started vomiting. He had to be taken to a hospital. The doctor said that this condition could be due to__________A. Empty stomachB. Food poisoningC. Due to weak stomach movementD. All of the above.

A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white-colored like albinos. Which of the following terms will you use to describe them?A.MutatedB.Embolised C.EtiolatedD.Defoliated

When aaBBcc is crossed with AaBbCc then the ratio of hybrid for all 3 genes is?

A biological catalyst is essentially(a) An enzyme(b) A carbohydrate (c) An amino acid (d) A nitrogenous base

According to Darwin diversity as found in Australian marsupials is due to:A. Convergent evolutionB. Adaptive radiationC. Parallel radiationD. Parallel evolution

Adrenal cortex secretes androgen it is known asA. TestosteroneB. AndrosteroneC. ProgesteroneD. Aldosterone

According to Tippo BGA is included inA. ChrysophytaB. PyrrophytaC. ChlorophytaD. Cyanophyta

Active immunity development is related to A. Natural killer cellsB. Memory cellsC. Helper T cellsD. Suppressor T cells

About how much blood is in the circulatory system of an average person?A. 1 litreB. 2 litresC. 5 litresD. 10 litres

(a)Ascending limb of Henle’s loop is …………. to water whereas the descending limb is ………… to it.(b)Reabsorption of water from distal parts of the tubules is facilitated by hormone ………….(c)Dialysis fluid contains all the constituents as in plasma except …………..(d)A healthy adult human excretes (on an average) ………………. gm of urea\/day.

ADH deficiency shows the following conditionsa) Only polydipsia b) Polyuriac)Polydipsia and polyuria d)Glucosuria

A detritivorous animal of economic importance is(a)Caterpillar larva(b)Leech(c)Earthworm(d)Giriraja fowl

When a cell is plasmolyzed it becomesA. Flaccid and its TP becomes zeroB. Turgid and its TP becomes zeroC. Turgid and TP becomes equal to OPD. Flaccid and DPD becomes zero

What activities can help demonstrate how the integumentary helps maintain homeostasis within the body?

According to the widely accepted “fluid mosaic model” cell membranes are semi-fluid where lipids and integral proteins can diffuse randomly. In recent years this model has been modified in several respects. In this regard which of the following statements are incorrect-A. Proteins can undergo flip flop movements in the lipid bilayer.B. Many proteins remain completely embedded within the lipid bilayer.C. Proteins in cell membranes can travel within the lipid bilayer.D. Proteins can remain confined within certain domains of the membrane.

A distinct feature of birds is A. FeathersB. ClawsC. Beaks without teethD. Wings

A family whose name is based upon its inflorescence isA) EuphorbiaceaeB) AsteraceaeC) FabaceaeD) Malvaceae

11th and 12th pair of ribs which are imperfectly formed and do not reach the sternum are called A) Pseudo ribs B) False ribs C) Floating ribs D) Visceral ribs

What is a complex permanent tissue? Write the different types of complex permanent tissues.

What accounts for :(1) The genetic similarity between daughter cells and the parent cell following mitosis and(2) The genetic dissimilarity between daughter cells and the parent cell following meiosis?

What are Unisexual and Bisexual Flowers ?

What are parthenocarpic fruits? A. Fruits enclosed in pods such as peasB. Fruits formed without fertilizationC. Very hard fruitsD. Fruits with more than one seed at their center

How are chromatin chromatid and chromosomes related to each other? A. Chromatin occurs as a diffuse network of fine filaments in the non-dividing nucleus. B. At the time of cell division chromatin material becomes condensed into a rod-like structure called chromosomes. C. Each chromosome has a centromere and two arms called chromatids. D. All of the above.

An example of whorled phyllotaxy-a. Kanerb. Rosec. Mintd. Marigold

A protein cell attains turgidity due to A. ElectrolysisB. ExosmosisC. PlasmolysisD. HydrolysisE. Endosmosis

A T.S. of dicot stem is stained with iodine with proper procedure. Which of the following structures are expected to show blue colour?A. EndodermisB. CortexC. PericycleD. Phloem

Assertion: Acraniata is a group of organisms that do not have distinct cranium. Reason: It includes small marine forms without a head. (a)Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. (b)Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. (c)The assertion is correct but Reason is incorrect. (d)The assertion is incorrect but the Reason is correct.

Why are lysosomes also known as scavengers of the cells?(a)Lysosomes are capable of removing the cell debris having dead and turned cell organelle by digesting them.(b)Lysosomes are not capable of removing the cell debris having dead and turned cell organelle by digesting them.(c)Lysosomes are capable of removing the DNA having died and turned cell organelle by digesting them.(d)None of the above

Angiosperms and gymnosperm resemble in havingA. Vessel in woodB. Mode of fertilizationC. SiphonogamyD. Nature of endosperm

Androphore structure is formed by: A. InternodeB. NodeC. SepalsD. Petals

Prepare with Vedantu’s Class 11 Biology Question Answers

Prepare better with Vedantu’s Question Answers for Class 11 Biology. These solutions cover every topic from the syllabus, with clear and simple explanations to make learning easier.

Vedantu provides step-by-step answers crafted by experts to ensure you understand concepts deeply and gain confidence for your board exams. With these trusted resources, studying Biology becomes more effective and stress-free. Let Vedantu help you achieve your academic goals and ace your exams!