(Botany and Zoology)
Duration: Three hours
Maximum Marks: 70
(Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.)
Instructions:
- Answer all questions in Part I and six questions in Part II, choosing two questions from each of the three sections A, B and C.
- All working including rough work, should be done on the same sheet as, and adjacent to, the rest of the answer.
- The intended marks for questions or parts of questions are given in brackets [ ].
Answer all questions.
(a) Give a brief answer for each of the following: [4]
- What are vestigial organs?
- Define root pressure.
- What is incomplete dominance?
- What is genetic conservation?
(b) Each of the following question(s)/statement(s) has four suggested answers. Choose the correct option in each case: [4]
-
Monadelphous stamens are those which:
- (i) united into more than two bundles
- (ii) united into two bundles
- (iii) unite into one bundle
- (iv) remain free
-
Determination of skin colour is an example of:
- (i) co-dominance
- (ii) polygenic inheritance
- (iii) incomplete dominance
- (iv) Pleiotropy
-
'Bt' cotton is resistant to:
- (i) insects
- (ii) draught
- (iii) salt
- (iv) Herbicides
-
Haemophilia is a:
- (i) Y linked disorder
- (ii) Autosomal sex disorder
- (iii) X linked disorder
- (iv) Deficiency disorder
(c) Give a scientific term for each of the following: [4]
- Maximum number of individuals that an environment can support.
- Exhibition of superiority of the hybrid over both of its parents.
- The functional unit of gene.
- The development of an embryo without the occurrence of fertilization.
(d) Expand the following abbreviations: [4]
- SCP
- ZIFT
- IPM
- PGA
(e) Name the scientists who are associated with the following: [4]
- Reverse transcription
- DNA fingerprinting
- Mutation
- Mass Flow Hypothesis
Answer any two questions.
(a) Give three differences between living and non-living organisms in levels of organization. [3]
(b) State the Theory of Recapitulation. [1]
(c) Give the difference between frame-shift mutation and substitution mutation. [1]
(a) State three similarities between Australopithecus and Apes. [3]
(b) Define genetic drift. [1]
(c) What is abiogenesis? [1]
(a) Give an account of the different types of natural selection. [3]
(b) Define Neo-Darwinism. [1]
(c) What are coacervates? [1]
Answer any two questions
(a) Give four anatomical differences between a dicot root and monocot root. [4]
(b) State the importance of water to plants. [4]
(c) Differentiate between: [2]
- (i) Absorption spectrum and action spectrum
- (ii) Racemose and cymose inflorescence
(a) Give an account of the follicular phase of the menstrual cycle. [4]
(b) Explain the process of spermatogenesis. [4]
(c) Define: [2]
- (i) Implantation
- (ii) Capacitation
(a) Give the functions of placenta in human females. [4]
(b) Explain the development of micro sporangium in plants. [4]
(c) Define: [2]
- (i) Triple fusion
- (ii) Porogamy
Answer any two questions.
(a) Give four differences between linkage and crossing over. [4]
(b) Explain the Meselson and Stahl's experiment for semiconservative replication of DNA. [4]
(c) State two goals of the Human Genome Project. [2]
(a) What is biodiversity? Mention the implications of the loss of biodiversity. [4]
(b) Give any four causes of cancer. [4]
(c) Mention the causative agent and the preventive measures for each of the following: [2]
- (i) Dengue
- (ii) Amoebiasis
(a) Briefly discuss the reasons for addiction to alcohol. [4]
(b) Explain sex determination in honey bees. [4]
(c) What is bio fortification? What role does it play in improving food production? [2]
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