Q1
mcq
1 mark
Match Column-I with Column-II and choose the correct option:
- A. a b c d (A) i ii iii iv
- B. (B) ii v i iii
- C. (C) v iv ii i
- D. (D) v i iv ii
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Q2
mcq
1 mark
Microbes commonly used in kitchen are
- A. Lactobacillus and Yeast
- B. Penicillium and Yeast
- C. Microspora and E.coli
- D. Rhizopus and Lactobacillus
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Q3
mcq
1 mark
The features of some structures of human male reproductive system are given below. Choose the correct option that matches the features with the structures.
- A. Seminal vesicle Urethra Scrotum Seminiferous tubule
- B. Prostrate Scrotum Testes Vas Deferens
- C. Seminiferous tubule Urethra Scrotum Epididymis
- D. Seminiferous tubule Vas Deferens Urethra Sertoli cells
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Q4
mcq
1 mark
Exploration of molecular, genetic and species level diversity for gaining products of economic importance is called
- A. Exploitation
- B. Bio-prospecting
- C. Bio-patenting
- D. Bio-piracy
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Q5
mcq
1 mark
Which connective tissue connects ovary to pelvic wall and uterus?
- A. Tendons
- B. Ligaments
- C. Cartilage
- D. Bone
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Q6
mcq
1 mark
Which of the following is not a component of detritus food chain?
- A. Dead Leaves
- B. Bacteria
- C. Fungi
- D. Zooplankton
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Q7
mcq
1 mark
Identify the plant in which emasculation is not required for ar
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Q13
mcq
1 mark
Assertion (A): When we see stars, we are apparently peeping into the past. Reason (R): What we see today is an object whose emitted light started its journey millions of years back reaching our eyes now.
- A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation for Assertion (A).
- B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation for Assertion (A).
- C. Assertion (A) is true, but Reason (R) is false.
- D. Assertion (A) is false, but Reason (R) is true.
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Q14
mcq
1 mark
Assertion (A): Flocs are masses of bacteria associated with fungal filaments in secondary treatment of sewage. Reason (R): Flocs help in digestion of solid waste by anaerobic respiration.
- A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation for Assertion (A).
- B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation for Assertion (A).
- C. Assertion (A) is true, but Reason (R) is false.
- D. Assertion (A) is false, but Reason (R) is true.
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Q15
mcq
1 mark
Assertion (A): In terrestrial ecosystem much larger fraction of energy flows through grazing food chain. Reason (R): Grazing food chain may be connected to Detritus food chain at some levels.
- A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation for Assertion (A).
- B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation for Assertion (A).
- C. Assertion (A) is true, but Reason (R) is false.
- D. Assertion (A) is false, but Reason (R) is true.
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Q16
mcq
1 mark
Assertion (A): The milk produced by transgenic cow ‘Rosie’ was nutritionally more balanced product for human babies than natural cow milk. Reason (R): It was human protein enriched m
- A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation for Assertion (A).
- B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation for Assertion (A).
- C. Assertion (A) is true, but Reason (R) is false.
- D. Assertion (A) is false, but Reason (R) is true.
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Q17
short answer
1 mark
(a) What is the role of LAB (Lactic Acid Bacteria) in preparation of curd ?
(b) Mention two health benefits of consuming curd.
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Q17
short answer
1 mark
Differentiate between a DNA and RNA nucleotide.
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Q18
long answer
2 marks
(a) Name the muscular and glandular layers of female uterus. Mention one function of each.
OR
(b) (i) Why are STI (Sexually Transmitted Infections) not detected in time ? (2 pts.)
(ii) Write two complications caused in later stages.
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Q18
short answer
1 mark
Name the two types of bonds present within a single nucleotide.
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Q19
short answer
1 mark
Write the importance of following in biotechnology:
(a) Ori (Origin of Replication)
(b) Enzyme Polymerase used in Polymerase Chain Reaction
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Q20
long answer
1 mark
(a) Given below is a pyramid found in an ecosystem, where each bar represents the standing crop available in the trophic level.
(i) Identify the kind of pyramid and with the help of an example explain the conditions where this kind of pyramid is possible in nature.
(ii) Write any two limitations of ecological pyramids.
OR
(b) In an ecosystem there was loss of biodiversity due to some project in that area.
(i) How will biodiversity be affected ? (2 points)
(ii) List two major causes of loss of biodiversity.
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Q20
short answer
Name the gene in the spores responsible for control of pest.
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Q21
long answer
Analyse the following two cases of sex determination in different organisms:
Case I: Males have (XO) sex chromosomes and females have two copies of same sex chromosome (XX).
Case II: Females have two different sex chromosomes (ZW) and males have two copies of same sex chromosome (ZZ).
Identify the type of heterogamety in each case, giving one example of each.
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Q21
short answer
1 mark
What effect will the spores of Bt have on insect pest ?
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Q22
long answer
A farmer grew two varieties of corn crop in field A and B. He grew normal corn crops in field A and GM corn crops in field B.
He observed that corn borers attacked only in field A. To control it, spores of Bt were sprayed on field A.
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Q22
short answer
1 mark
How has corn plants of field B developed resistance against this pest ? Explain.
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Q23
long answer
Observe the given picture carefully. A mixture of DNA with fragments ranging from 100 base pairs to 1800 base pairs were separated by electrophoresis on agarose gel with the following arrangement:
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Q24
short answer
1 mark
What result will be obtained in staining with ethidium bromide ? Explain with reasons.
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Q24
short answer
1 mark
Mention the scientific name of the source plant and the part from which opioids are extracted.
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Q24
short answer
3 marks
(a) Mention the scientific name of the source plant and the part from which opioids are extracted.
(b) How are morphine and heroin related ? Mention the effect each one of them has on human body.
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Q25
short answer
2 marks
The above setup was modified as shown below and a band with 100 base pairs was obtained at X.
What changes were made to the previous design to get a band at ‘X’. Why did the band appear at ‘X’ ?
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Q25
long answer
3 marks
Give the schematic representation of oogenesis in human female. Indicate chromosome number also.
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Q26
long answer
(a) Do all pollen grains remain viable for the same length of time ? Support your answer with two suitable examples.
(b) How are pollen grains stored in pollen banks ?
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Q27
short answer
2 marks
How are morphine and heroin related ? Mention the effect each one of them has on human body.
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Q27
long answer
(a) What is pedigree analysis ? Mention its importance in human genetics. (2 pts.)
(b) Analyse the following pedigree and write the
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Q29
short answer
A student performed some crosses in plants and represented the result in the form of bar graphs as shown below. Each graph displays the phenotypic proportion of the progeny. Study the graphs and answer the questions:
(a) What can you infer about the genotype of parents in crosses I and II ?
OR
(a) Which genetic cross is represented by these crosses ?
(b) Looking at bar graph of cross III, identify the type of cross performed and its importance in genetics.
(c) What conclusion can you draw from the results of bar graphs of crosses I and II ? Name the genetic principle illustrated.
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Q30
short answer
2 marks
Do all pollen grains remain viable for the same length of time ? Support your answer with two suitable examples.
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Q30
short answer
The diagram below shows the distribution of two barnacle species, Chthamalus and Balanus on a rocky sea shore. When Balanus is experimentally removed, Chthamalus expands its range in lower intertidal zone.
(a) Identify and define the ecological phenomenon demonstrated by this observation.
OR
(a) State the principle that explains the elimination of one species.
(b) Two different species can compete for the same resource. Give another example of it.
(c) How do species avoid competition in nature ? Explain with an example.
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Q31
short answer
How are pollen grains stored in pollen banks ?
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Q31
long answer
3 marks
(a) In angiosperms, the female gametophyte develops from a single cell of megasporangium.
(i) Name that cell of megasporangium and describe the sequential changes it undergoes to form a mature female gametophyte.
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Q32
long answer
(b) (i) What are bio-fertilizers ?
(ii) Name the different types of microorganisms used as bio-fertilizers in organic farming and explain how each contributes to soil fertility.
(iii) Write two advantages of using bio-fertilizers over chemical fertilizers.
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Q33
short answer
2 marks
What is pedigree analysis ? Mention its importance in human genetics. (2 pts.)
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Q33
long answer
(a) (i) Watson and Crick’s discovery of double helical structure was based on which two findings. Also mention the name of the scientists associated with these findings.
(ii) Write down the salient features of double helix structure of DNA (any three points).
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Q33
long answer
(b) Given below is a stretch of DNA showing the coding strand of structural gene of transcription unit.
5' - ATG ACC GTA TTT TCT GTA GTG CCC GTA CTT CAG GCA TTA 3'
(i) Write the corresponding template strand and m-RNA strand that will be transcribed along with its polarity.
(ii) If GUA of transcribed mRNA is an intron, then depict the sequence involved in formation of mRNA / mature / processed hnRNA strand:
(1) In a bacterium
(2) In humans
(iii) How many amino acids the resulting polypeptide will have after the process of translation in humans ?
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Q39
short answer
1 mark
The diagram below shows the distribution of two barnacle species, Chthamalus and Balanus on a rocky sea shore. When Balanus is experimentally removed, Chthamalus expands its range in lower intertidal zone. Identify and define the ecological phenomenon demonstrated by this observation.
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Q40
short answer
1 mark
State the principle that explains the elimination of one species.
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Q41
short answer
1 mark
Two different species can compete for the same resource. Give another example of it.
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Q42
short answer
2 marks
How do species avoid competition in nature? Explain with an example.
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Q43
short answer
2 marks
Draw a well labelled diagram of mature female gametophyte. Label any four parts.
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Q44
short answer
Name the protozoan species that is responsible for causing the most serious and even fatal malarial disease.
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Q45
short answer
2 marks
Name the host in which the parasite completes its sexual stages and explain the changes taking place.
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Q46
short answer
1 mark
How does the parasite damage the human body after entering the blood stream?
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Q47
short answer
1 mark
Suggest two effective preventive measures to control the spread of this disease in endemic regions.
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Q49
short answer
3 marks
Name the different types of microorganisms used as bio-fertilizers in organic farming and explain how each contributes to soil fertility.
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Q50
short answer
1 mark
Write two advantages of using bio-fertilizers over chemical fertilizers.
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Q51
short answer
2 marks
Watson and Crick’s discovery of double helical structure was based on which two findings. Also mention the name of the scientists associated with these findings.
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Q52
short answer
3 marks
Write down the salient features of double helix structure of DNA (any three points).
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