SAMPLE PAPER OF BIOLOGY class11

CLASSXI

SAMPLE PAPER OF BIOLOGY

SET-IV

Q. NO.	QUESTION	MARKS
	Section A
1.	The accumulation of cell wall deposits of diatoms over billions of years is referred to as ‘diatomaceous earth’. What makes the cell wall of diatoms indestructible?	1
2.	Name the hormone that maintains the normal rhythm of sleep-wake cycle. OR Which of the following hormones play major role in development of immune system: a) Parathyroid hormone        b) thymosin       c) thyroxine     d) melatonin	1
3.	Mention one difference between DNA and RNA on the basis of type of sugar found in them.	1
4.	A diploid cell has 24 chromosomes in its nucleus. What will be the number of chromosomes in the daughter cells under following cases: (a) if the cell undergoes mitosis, (b) if cell undergoes meiosis?	1
5.	Name the hormone which makes the plants more tolerant to various stresses.	1
6.	Why are the flowers of cucumber referred to as epigynous?	1
7.	Identify the following biomolecule.	1
8.	Which class of kingdom fungi is called fungi imperfecti and why?	1
9.	Name the primary site of exchange of gases in human body?	1
10	Write two adaptations for aerial mode of life.	1
11.	Assertion: Mostly mammals are viviparous  Reason: All mammals have milk producing glands​ Both assertion and reason are correct and reason is correct explanation. Both assertion and reason are correct but reason is not correct explanation. Assertion is correct but reason is false. Both assertion and reason are false	1
12.	Assertion: Gap junctions perform cementing function to keep the neighbouring cells together. Reason: Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc. Both assertion and reason are correct and reason is correct explanation. Both assertion and reason are correct but reason is not correct explanation. Assertion is correct but reason is false. Both assertion and reason are false	1
13.	Assertion : Angiospermic flowers perform the function of sexual reproduction. Reason : The male and female reproductive structures are found in the flowers. Both assertion and reason are correct and reason is correct explanation. Both assertion and reason are correct but reason is not correct explanation. Assertion is correct but reason is false. Both assertion and reason are false	1
14.	Assertion :  Abdominal muscles is related with respiration in animals Reason : Relaxation of abdominal muscles draws in air Both assertion and reason are correct and reason is correct explanation. Both assertion and reason are correct but reason is not correct explanation. Assertion is correct but reason is false. Both assertion and reason are false	1
	( Case Study)
15.	EXCRETION Excretion is a process in which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys and skin. Aquatic animals usually excrete ammonia directly into the external environment. In terrestrial animals ammonia-like compounds are converted into other nitrogenous materials. The excreted material may be called ejecta.	4
i	In unicellular organisms, waste products are discharged outside through- surface of the cell Kidneys  Glands All of these
ii	Waste that is eliminated by the skin in humans is/are- Water and salts Urea Lactic acid All of these
iii	Assertion: Aquatic animals usually excrete ammonia directly into the external environment. Reason: This compound has high solubility and there is ample water available for dilution. Both assertion and reason are correct and reason is correct explanation. Both assertion and reason are correct but reason is not correct explanation. Assertion is correct but reason is false. Both assertion and reason are false
iv	Birds excrete their nitrogenous wastes as- Ammonia  Uric acid  Urea Amino acid
16.	Bakanae disease is also called as foolish seedling disease. It affects the rice plant through the roots or crowns. It is caused by Gibberella fujikuroi. Affected seedlings show abnormal elongation and in severe cases may lead to death.	4
i	To which category the pathogen of the disease belongs. Protozoa Virus Fungus Bacteria
ii	The abnormal elongation of seedlings in affected plants is due to secretion of Ethylene Auxin Gibberellin Cytokinin
iii	Assertion: Figure 1 has an internode length of "0" as well as it is a dwarf plant.  Reason:     Figure 1 shows a plant lacking gibberellins Both assertion and reason are correct and reason is correct explanation. Both assertion and reason are correct but reason is not correct explanation. Assertion is correct but reason is false. Both assertion and reason are false
iv	Assertion : Figure3 shows a much longer internode length  Reason:      Figure 3 shows a plant with a large amount of gibberellins  Both assertion and reason are correct and reason is correct explanation. Both assertion and reason are correct but reason is not correct explanation. Assertion is correct but reason is false.  Both assertion and reason are false
	Section B
17.	State how prothallus is formed in ferns? Is it sporophytc or gametophytic plant body?	2
18.	Differentiate between poikilothermous and homoiothermous animals. Identify which one is poikilothermous and homoiothermous : parrot, frog	1 ½ +½
19.	Viruses are obligate parasites. What does this mean? Name the components that make up a virus.	1 1
20.	State why do we classify organisms? Mention what is the lowest category of taxonomic heirarchy?	2
21.	Identify i) and ii) and label A and B i) ii)	½ X 4=2
22.	Define apical dominance. Which plant hormone induces it and which hormone overcomes it?	2
23.	Lipids are not strictly macromolecules. Justify. OR a)  Name the disc shaped sacs present in golgi apparatus. b) Why does golgi apparatus remain in close association with the endoplasmic reticulum?	2
24.	Mention one similarity and one difference between mitochondria and chloroplast.	2
25.	In pea flower, the corolla is called vexillary and in china rose it is called twisted. Why?	2
	Section C
26.	Some enzymes have non-protein part called co-factors. List the three types of co-factors and how do they differ in their binding to the protein part of enzyme.	3
27.	a) Apart from skull, brain is protected by three meninges. Name them. 3  b) Name the three parts of hind brain.	½ X 6=3
28.	Give scientific terms for the following: 3  Fused carpels  Flower with superior ovary  Flower with bilateral symmetry   Free petals  A sterile stamen Type of inflorescence in which main axis continues to grow.	3
29.	Comment on each of the following:   Defence system in coelentrates.  Parasitic character of Platyheminthes.  Locomotory system in echinoderms.	3
30.	State and explain Blackman’s Law of Limiting factors with the help of an example. OR Diagrammatically show Z scheme of light reaction.	3
	Section D
31.	Give the schematic representation of Hatch and Slack pathway (C4 cycle).                                  Or       Explain Kreb’s cycle. Where does it occur? What is its end product?	5
32.	Explain the various events occurring during mitosis with the help of diagrams. 5 OR  With the help of diagram, explain briefly the fluid mosaic model of plasma membrane.	5
33.	Briefly explain the events occurring during cardiac cycle. Support your answer with well labelled diagram of human heart. OR Explain the various forms in which carbon dioxide and oxygen are transported by blood	5

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