HSC Board Biology Model Question Paper 12th Class
Std- 12th (Sci) Sub – BIOLOGY Marks – 70 Time 3Hrs
Section A HSC Board Biology
Q.1 Select and write the correct answer:Marks 10
1) The technique used to block the passage of sperm in male is ………
a) Tubectomy b) Vasectomy c) Coitus interrupts d) Rhythm Method
2) Monothecous anther has ……. .. Pollen sacs.
a) Single b) Two c) Three d) Four
3) Find the odd one out:
a) Caecum b) Nictatating Membrane c) Cocccyx d) Sacrum
4) Which one of the following prevents collapsing of trachea?
a) Muscle b) Diaphgram c) Ribs d) Cartilaginous rings
5) Necrosis means
a) Yellow Spot on Leaves b) Death of tissue c) Cell Shrinking d) Witingof leaves
6) Which of the following produces antibodies?
a) Monocytes b) Erythrocytes c) Lymphocytes d) Monocytes
7) What is injected in vaccination?
a) Half killed pathogen b) Dead Pathogens c) Live Pathogens d) Readymade antibodies
8) In transgenic crop substance provitamin A is obtained in……….
a) Rice b) Tomato c) Canola d) Sugarcane
9) In an ecosystem, bacteria are considered as ……..
a) Primary consumers b) Microconsumers c) Macroconsumers
d) Secondary consume
10) The term terror of Bengal is used for…….
a) Alglal Bloom b) Water hyacinth c) Increased BOD d) Eutriphication .
Q.2 Answer the following : Marks 8
1) Give the definition of Cyclosis.
2) Name the following
Enzyme involved in synthesis of RNA primer.
3) In which region of chromosomes does crossing over take place ?
4) Give the importance of the following : Germ Pores.
5) What is the supplementary food of silage?
6) What are the different types of electrophoresis?
7) What are the various characteristics of soil ?
8) Define cleavage.
SECTION B HSC Board Biology
Attempt Any EIGHT questions of the following:Marks 16
Q.3 Distinguish between Vasa efferentia and Vasa deferentia.
Q.4 Distinguish between Monohybrid cross and Dihybrid cross.
Q.5 Function of DNA regulates and controls all the cellular activities.
Q.6 Give the definition of the following:
a) Organic evolution b) Adaptive radiation
Q.7Explain the concept of oxygen dissociation curve.
Q.8 What is haemoglobin count in normal human beings? What is the function of haemoglobin ?
Q.9 What is a choroid plexus? State its locations.
Q.10 Mention any two developments in human which helped him to move.
Q.11 The role of kidney in hormone secretion.
Q.12 Name the following : a) Best silk b) Silk of inferior quality.
Q.13 Match the columns
| Column A:(Asexual) | Column B ( Example) | ||
| a) | Spore formation | a) | Spirogyra |
| b) | Conidia formation | b) | Yeast |
| c) | Fragmentation | c) | Chlamydomonas |
| d) | Budding | d) | Penicillium |
Q.14 Define and explain the terms Bioethics.
SECTION C
Attempt Any EIGHT questions of the following Marks 24
Q.15 Give reasons 2,4- D is used as herbicide.
Q.16 Types of sex linked genes:
( Haemophilla, Icthyosis, nephritis, Myopia, Hypertrichosis, Retinitis pigmentosa)
| Column A | Column B | |
| 1 | Completely X – Linked genes | |
| 2 | Completely Y – Linked genes | |
| 3 | Incomplete sex-Linked genes |
Q.17 Explain capillary theory of water trnslocation.
Q.18 Give the Definitions of the following : a) Ecosystem b) Huminification c) Mineralization
Q.19 Write short notes on Blood plasma.
Q.20 What will be the effect of thyroid atrophy on human body ?
Q.21. Write short note on Acute phase proteins (APP)
Q.22 What are the three main types of niches?
Q.23. Explain how Bacillus thuringiensis acts as a bio- control agent.
Q.24.Give the definitions of the following : (a) Transduction (b) Transformation (c) Transfection
Q.25. Explain BOD and its effects on aquatic ecosystem.
Q.26. Write short notes on: Plasticity
SECTION- D
Attempt any THREE questions of the following: 12 Marks
Q.27 Name the following:
(i) Aquatic plants which are anemophilous.
(ii) One plant each of Hypohydrophily and epihydrophily.
(i) Recent or Modern method of vegetative reproduction of plants that form plant tissue. (iv) A diploid nucleus in central cell of embryo sac in plants.
Q.28. Answer the following: (Ch. 2)
(i) How many primary spermatocytes and oocytes are required for the formation of 100 spermatozoa and ova ?
(ii) What is the role of birth control pills?
(iii) What is MTP Act?
(iv) What is atresia with respect to ovary in human females?
Q.29. Answer the following:
(i) What is the role of Mg++ in translation?
(ii) Which gene acts as a regulatory gene in lac operon? (iii) When was Human Genome Project started? When was it completed?
(iv) What are VNTRS?
Q.30.Describe mechanism of absorption of water.
Q.31. Describe in brief, an account of disorders of adrenal gland.
——————————-Best Of Luck——————————-
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