CBSE Sample Papers for Class 11 Biology UnSolved Set 1
1.Yellowing of edges in leaves is seen in a plant. Which nutrient deficiency is cause of it? 
2.Name the cells responsible for maintaining a current of water through the body I in poriferans.
3.How does endoplasmic reticulum arise? . 
4.There are fewer bones in human skull as compared to other animals.What advantage does it have in comparison to other vertebrate animals? 
5.Name an angiospermic plant with respiratory roots. 
6.Explain molecular homology with an example. 
7.Why do leaves of grasses roll on a dry and sunny day? Give reason. 
8.(a)Give examples of any one neutral and one basic amino acids. [1/2]
(b)Name any one essential amino acids in humans. [1/2]
(c)In a protein, which bond link two amino acids? 
9.Why the wood of different trees is valued differently for specific purpose? 
Differentiate between neurons and neuroglia. 
10’Bryophytes are referred to as amphibians of plant kingdom’. Justify the statement 
11.Inflammatory responses can be controlled by a certain steroid. Name the steroid, its source and also state its other important functions. 
12.In cellular respiration, both aerobic and anaerobic modes of respiration releases energy. Which of them releases more energy to be utilised by cell? Give an account of net gain of energy (ATP) during that process. 
13.Distinguish between the following. 
(a)Prostomium and peristomium.
(b)Septal nephridium and pharyngeal nephridium.
14.Write down the significance of mitosis. 
15.To get a carpet-like grass, lawns are mowed regularly. Is there any scientific explanation for this? 
16.(a)Define vascular cambium. 
(b)Write down the differences between fascicular and interfascicular cambium. 
17.Plants are autotrophic, can you think of some plants that are partially heterotrophic? 
18.Based on the external features, explain how a flower is a modified shoot. 
19.Radha was running on a treadmill at a great speed for 15 minutes continuously. She stopped the treadmill and abruptly came out. For the next few minutes, she was breathing heavily/fast. Answer the following questions.
(a)What happened to her muscles when she did strenuously exercised?
(b)How did her breathing rate change? 
20.Write a short note on guttation. How is it different from transpiration? 
Explain the kind of interactions between water molecules, that are responsible for the upward movement of water up to great heights in plants. 
21.Ritu and her friends went on a school tour to Uttarakhand. As the bus moved past
the circular, sharp turns on the narrow roads elevating the mountains at a fast speed, everyone in the bus felt that they were moving in a circular motion. Suddenly, Ritu began to feel dizzy and started vomiting. The teacher accompanying them made her lie down and instructed others to calm down and rest peacefully rather than rushing. He also explained the reason to them with a scientific explanation.
(a)Why did Ritu started feeling dizzy all of a sudden?
(b)Which sensory organ gets affected while moving up at high altitudes?
(c)What scientific explanation, the teacher might have given to students?
(d)What values are reflected by the teacher?
22.Describe the structure of the nucleus with a well labelled diagram. 
In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll-a. Based on diagram answer the following.
(a)What does the action spectrum indicate? How can we plot an action spectrum?Explain with an example. 
(b)How can we derive an absorption spectrum for any substance? 
(c)If chlorophyll-a is responsible for light reaction of photosynthesis, why do the action spectrum and absorption spectrum not overlap? 
23.Based on the types of reactions catalysed, give an account of enzymes.
CBSE Sample Papers for Class 11 Biology UnSolved Set 2
Section – A
1.Name the hormones which increases and which decreases the rate of photosynthesis. 
2.Define a monograph. 
3.Give name to the association between roots of higher plants and fungi. 
4.Explain Zwitter ionic form of amino acid. 
5.Which type of joint is present between the carpal and metacarpal of thumb? 
Section – B
6.Explain the structure of a metacentric chromosome, with the help of a diaqram.
7.Plasmolysis does not occur in animal cells but takes place in plant cells. Explain.
8.Define phyllotaxy. Differentiate between opposite and whorled phyllotaxy. 
9.What are the events taking place in telophase stage of mitosis? 
Name two hormones secreted by adrenal medulla and also write the non-hormonal functions they are responsible for.
Section – C
10.Give reasons why?
(a)Chlorophyll-a occurs in different forms.
(b)Chloroplasts are generally located at outer margins of mesophyll cells.
11.How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not, then how are these transported across the membrane? 
12.Usually the vascular bundles in roots are radial, i.e. xylem lies exterior to phloem. Is this condition particularly advantageous to roots?
13.What is the differences between flora, fauna and vegetation? Eichhornia crassipes is called as an exotic species, while Rauwolfia serpentina is an endemic species in India. What do these terms exotic and endemic refer to? 
14.What do you understand by rigor mortis? 
15.Describe the phenomenon of heterospory in plants. Also give its two examples. 
16.Interphase, also known as resting stage of cell is considered to be the most active phase of cell. Justify the statement.
Draw a labelled diagram of internal structure of cilia/flagella. Also, give differences between cilia and flagella.
17.(a)Which is the focussing part of eye? 
(b)What causes maximum refraction? 
(c)What is the function of lens of eye? 
18.(a)In which parts of body are smooth muscles present?
(b)List differences between cardiac muscles and straited muscles.
19.Observe the diagram and answer the following.
(a)Are these types of guard cells found in monocots or dicots?
(b)Which of these shows a higher water content A or B ?
(c)Which element plays an important role in the opening and closing of stomata?
20.Distinguish between intracellular and extracellular digestion.
21.Payal was walking along with her mother in a garden, during early morning. They observed many beautiful flowers of varied colours and shapes opening up. Payal got so attracted to these brightly coloured flowers and their smell that she went on to pluck them. Her mother stopped her from plucking by saying that they are very important for them. Out of curiosity Payal, asked her mom how there is, so much of variation in colours of flowers. Her mother being a biology teacher explained the reason to her.
(a)Why flowers are important to plants?
(b)What imparts colour to flowers?
(c)Name the other types of plastid found in plants.
(d)What values ;are shown by Payal? [4 x 1]
Section – D
22.(a) Illustrate the differences between a dicot and monocot seed,
(b) Draw a labelled diagram of a gram seed and a maize seed.
‘We still grow crops on land inspite of developing a successful technique of growing plants without soil.’ Explain. 
23.Describe the famous Watson and Crick model of DNA? 
Respiratory pathway is believed to be a catabolic pathway. However, nature of TCA cycle is amphibolic. Explain. 
CBSE Sample Papers for Class 11 Biology UnSolved Set 3
1.Mention a common characteristic feature of mammalian RBC and plant sieve tube cells. 
2.Due to large scale production of rice, an important greenhouse gas concentration is increasing in the atmosphere. Name it.
3.Name the enzymes of citric acid cycle present in inner mitochondrial membrane.
4.What are the components of a mitotic apparatus in an animal cell? Which of these components is lacking in plant cell? 
5.Glomerular filtrate comprises of water, glucose, amino acids and creatine. Which among the above are reabsorbed actively and rapidly by blood? 
6.Explain mixotrophic nutrition with an example. 
7.Differentiate between runner and stolon. 
8.What connects the left and right hemispheres of cerebrum? Name the four lobes into which each hemisphere is divided. 
9.Give one difference between 
(a)Imbibition and diffusion
(b)Osmotic pressure and osmotic potential
Discuss the contribution of Julius Von Sachs. 
10.Describe the biochemical composition of plasma membrane with special emphasis on arrangement of lipid molecules. 
11.Define collenchyma. Describe its role in structure and other function in the plant body of herbaceous angiosperm. 
12.”All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement. 
13. (a)Why is conditioned reflex considered to be lost with time?
(b)Give two advantages of reflex action in animals.
14.Explain how inhibitors might be important for plant survival. 
15.(a)Name the disaccharide, the major sugar found in insect haemolymph. 
(b)Identify the organic compounds having common names. 
(i) Brain sugar (ii) Fruit sugar
(iii) Malt sugar (iv) Table sugar
(c)Give names of two saturated and two unsaturated fatty acids. 
16.Draw a labelled diagram of a nephron showing blood vessels, ducts and tubules. Also, write the names of two main types of nephrons. 
17.How does a tree trunk exchange gases with the environment although it lacks stomata? 
18.Distinguish anaphase of mitosis from anaphase-I of meiosis. 
Give an account of structure, location and function of compound epithelium. 
19.Write a short note on action spectrum. 
20.Explain the role of calcium ions in muscle contraction. 
21.While having lessons of biology in school, Rohit listened carefully to his teacher Mrs Kavita, explaining how do plants grow, develop and prepare their own food by photosynthesis. She also explained them that they themselves can observe this by growing a plant at home. Rohit too, out of curiosity potted a plant in his room but after a week or two, he observed that leaves of plant became yellow and finally they started wilting.
He asked his biology teacher about this and she told him that light is necessary for photosynthesis to occur.
(a)Give an overall equation for photosynthesis showing its requirements as well as products formed.
(b)What role do light play in the process of photosynthesis?
(c)Name other factors that influence the rate of photosynthesis.
(d)What values are observed from Rohit’s character? [4 x 1]
22.Allium sativum belongs to which class, family? Describe the floral characters and floral formula of this family. 
We find that Rhizobium forms nodules on the roots of leguminous plants. Also Frankia, another microbe forms nitrogen-fixing nodules on the roots of non-leguminous plant Alnus.
(a)Can we artificially induce the property of nitrogen-fixation in a plant, leguminous or non-leguminous? 
(b)What kind of relationship is observed between mycorrhiza and pine trees? 
(c)Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of an example. 
23.Describe various forms of lipid with a few examples.
Name the organism in which heterocyst is present,Explain its features. Which feature make it suitable for nitrogen-fixation?
CBSE Sample Papers for Class 11 Biology Un Solved Set 4
1.Plants do often die in waterlogged soil. Give reason. 
2.Give one difference between pyranose and furanose forms of simple sugars, 
3.Mention any two unique and special properties of nervous tissue. 
4.A farmer is using 2,4-D on his wheat crop field. What is the purpose of using this substance in the field? 
5.Give the scientific term used for lateral appendages in aquatic annelids. 
6.Oxygen is evolved during which type of phosphorylation? Name the source from where it comes and mechanism involved in it. List the ions involved in its catalysis.
7.List differences between cilia and flagella. 
8.Why is the absorption of minerals by the plants takes place through roots, not by leaves? 
9.Write a note on cortex region of dicot root. 
Why does the body deaminate excess amino acids? 
10.Why are blood, bone and cartilage called connective tissue? 
11.(a) What are casparian strips? State their function. 
(b) Define wood botanically. 
12.Describe the fate of pyruvic acid in the absence of oxygen. 
13.Draw a diagrammatic representation of mechanism of translocation. 
14.(a) While observing a dividing cell under microscope, is it possible to determine whether it is a plant or animal cell? 
(b)Give an account of differences in mitotic division of a plant cell and animal cell.
15.How is sulphur important for plants? Name the amino acids in which it is present?
16.Describe tertiary structure of protein with an example. 
17.(a) Name the plants having adopted ‘Kranz anatomy’ and for what that condition are they adapted to?
(b) In what respect are these plants superior to those who lack this kind of anatomy? 
18.The heterosporous pteridophyte show certain characteristics which are precursor to the seed habit in gymnosperms. Explain. 
19.Canopy of banyan tree is extended over a large area”. Explain. 
20.What type of skeleton provides support and shape to Hydra? Explain. 
What are the peculiar features that you find in parasitic Platyhelminthes?
21.Sohini while going through her biology lessons at home, came across the statement that certain hormones work in an antagonistic manner in our human body to regulate a particular kind of metabolism. She got confused and didn’t understand the concept. Next day, she asked her biology teacher that how two hormones regulate each other’s activity antagonistically. The teacher explained him with the help of examples related to our body system. Then she easily understood the concept.
(a)Name two pairs of hormones that are antagonistic to each other. Describe their functions as well.
(b)What do you understand by target tissue or organ, with respect to hormonal action?
(c)What values are reflected by Sohini’s teacher? 
22.Explain briefly, micturition and disorders of the excretory system. 
Describe the important steps in muscle contraction. 
23.What do you understand by photoperiodism and vernalisation? Describe their significance. 
Taking the example of a bacterial cell, describe the structure of a prokaryotic cell. 
CBSE Sample Papers for Class 11 Biology Un Solved Set 5
1.Name the homopolysaccharide called as animal starch. 
2.State the effect of increased and decreased solute concentration on water potential inside the cells. 
3.A compound concerned with the storage of oxygen in mammalian muscles. Name it. 
4.A plant has its inflorescence found in hanging Write its name and the type of inflorescence. 
5.Name the hormone that controls both the Na+and K+ metabolism in the body.
6. Most of the tall trees of world are conifers. Give reasons in support of this statement,if it is correct.
7.“Longer the loop of Henle more hypertonic is the urine produced”. Explain. 
8.Differentiate between male gametophyte of pteridophyte and male gametophyte of angiosperms. 
9.Draw a labelled diagram of the structure of centriole. 
Give an account of differences between rough endoplasmic reticulum and smooth endoplasmic reticulum. 
10.(a) Explain how reproduction in fungi takes place via vegetative means, asexually and sexually?
(b) Poriferans are more primitive than cnidarians. Mention some characteristics that justifies it.
11.Explain why abscisic acid is known as stress hormone. 
12.Define uniport, symport and antiport. Do they require energy? 
13.Give appropriate reasons why?
(a)Adrenal glands are called glands of emergency. 
(b)Parathormone is also called Collip’s hormone. 
(c)The posterior lobe of pituitary does not releases its own secreted hormones. 
14.Differentiate between 
(a)Competitive and allosteric inhibition
(b)Gj and G2-phase of cell cycle
15.What essential role does the root endodermis play during mineral absorption in plants? 
16.Define transitional epithelium. State its significance. 
17.Exchange of calcium between bone and extracellular fluid takes place under the influence of certain hormones.
(a)What will happen if more of Ca2+ is in extracellular fluid? ’
(b)What will happen if very less amount of Ca2+ is in the extracellular fluid?
18.Describe Cori’s cycle in brief, explaining its importance. 
19.Is rubber a primary metabolite or a secondary metabolite? Write four sentences about rubber. 
Draw a nitrogen cycle showing relationship between the three main nitrogen pools atmospheric, soil and biomass. 
20.A given short day has a 13 hours of day light, as its critical photoperiod. Will it flower if we increase its daylight to 15 hours? 
21.Shushrut and Shashank were twin brothers, almost similar in their habits and nature. But Shashank didn’t like hard fruits like pear and always insisted on having apples and oranges, etc. Both the brothers went into an argument over which fruit to eat. And Shashank explained that pear is not a good fruit as it is hard, gritty and have stones in it. Their mother, who was a biology teacher explained them that it is due to difference in kind of tissues present in fruits.
(a)Name the tissues responsible for grittiness and hardness in fruits like pear.Briefly describe them.
(b)Mention other functions of this tissue in plants. 
(c)What values are reflected by their mother?
Section – D
22.What can we conclude from the statement that the action and absorption spectrum of photosynthesis overlap? At which wavelength do they show peaks? 
Differentiate between 
(a)Respiration and combustion
(b)Glycolysis and Krebs’ cycle
(c)Aerobic respiration and fermentation.
23.Explain the process of secondary growth in roots.
Describe the concept of metabolism and also write about the metabolic basis for living system.