(a) Name the following.
(i) Type of cell division in which the chromosome number is maintained throughout the process.
(ii) Nerves arising from the brain stem.
(iii) Movement of ions from the region of lower concentration to higher concentration by the use of energy.
(iv) Phenomenon of the suppression of growth of lateral buds by apical buds.
(v) Cells of pancreas secreting insulin.
(b) State whether the following statements are true or false. If false, rewrite the correct form by changing the first or the last word only.
(i) The pituitary gland functions both as endocrine and exocrine glands.
(ii) White blood cells (WBC) in the body have an average life of about 120 days.
(iii) Rod cells are photoreceptor cells that are sensitive to dim light.
(iv) The smallest unit of light energy absorbed by chlorophyll during photosynthesis is proton.
(v) The difference between the birth rate and death rate is given by the growth rate of a population.
(c) Match the terms in column ‘B’ with the suitable terms given in column ‘A’. Rewrite the correct matching pair.
Column I | Column II |
(i) Corpus luteum | (a) Excess of glucose in blood |
(ii) Mortality | (b) Movement towards light |
(iii) Diabetes mellitus | (c) Progesterone |
(iv) Phototropism | (d) Process by which water enters root hair cell |
(v) Endosmosis | (e) Number of deaths in a specified period of time |
(d) The structures given below are found in the plant or animal body. List down the specific function performed by these structures.
(i) Centrosome
(ii) Organs of Corti
(iii) Hydathodes
(iv) Distal convoluted tubule of kidney
(v) Placenta
(e) Given below is an apparatus used to study a particular process in plants. Study the same and answer the questions that follow.
(i) State the aim of the experiment.
(ii) What is the purpose of using soda lime?
(iii) Why is KOH kept inside the bell jar?
(iv) What is the next step followed after this setup?
(v) What result is expected from the above setup?
(f). Expand the following abbreviations:
(i) ABA
(ii) ATP
(iii) FAD
(iv) NADP
(v) FSH
(g) Give technical terms for the following:
(i) Pressure generated in root cells, which pushes water into xylem.
(ii) Alternative form of a gene on a pair of homologous chromosome.
(iii) Statistical study of human population.
(iv) Non-nucleated, disc shaped and biconcave blood cell.
(v) Oozing of water drops from the tip or edges of a leaf.
(h) The first pair in the following list is related to each other. Complete the second pair with suitable word in a similar manner.
(i) Adrenal gland: kidney:: Pituitary gland:…….
(ii) Meiosis: 4 cells:: Mitosis:……….
(iii) Cerebrum: forebrain:: Cerebellum:……….
(iv) Neuron: nervous system:: Corpus luteum:…….
(v) Haemoglobin: iron:: Chlorophyll:………
[8x5=40]
(A) (i) Mitosis
(ii) Cranial nerves
(iii) Active transport
(iv) Apical dominance
(v) Beta cells of pancreas
(B) (i) False, the pancreas functions both as endocrine and exocrine glands.
(ii) False, red blood cells (RBCs) in the body have an average life of about 120 days.
(iii) True
(iv) False, the smallest unit of light energy absorbed by chlorophyll during photosynthesis is photon.
(v) True
(C)
Column I | Column II |
(i) Corpus luteum | (a) Progesterone |
(ii) Mortality | (e) Number of deaths in a specified period of time |
(iii) Diabetes mellitus | (a) Excess of glucose in blood |
(iv) Phototropism | (b) Movement towards light |
(v) Endosmosis | (b) Process by which water enters root hair cell |
(D) (i) Centrosome helps in spindle formation during cell division in animal cells.
(ii) Organ of Corti has audio receptor cells that pick up vibration and convert it to nerve impulses.
(iii) Hydathodes are openings or pores in apical part of a leaf through which guttation occurs in the plant.
(iv) Distal convoluted tubule helps in reabsorption of remaining water and chlorides.
(v) Placenta allows diffusion of oxygen and nutrient from mother to the foetus and removal of nitrogenous waste of foetus to mother.
(E) (i) Aim – To show that carbon dioxide is necessary for photosynthesis.
(ii) Soda lime frees the air passing through it from carbon dioxide.
(iii) KOH or potassium hydroxide absorbs carbon dioxide present in the bell jar.
(iv) Plant’s leaf from the above setup is subjected to starch test.
(v) Plant in the above setup fails to make starch and therefore, its leaves give negative response to iodine test and thus, stain brown with iodine.
(F)
(i) Abscisic Acid
(ii) Adenosine Tri-Phosphate
(iii) Flavin Adenine di-nucleotide
(iv) Nicotinamide Adenine di-nucleotide Phosphate
(v) Follicle Stimulating Hormone
(G)
(i) Root pressure
(ii) Alleles
(iii) Demography
(iv) Red Blood Cell (RBC)
(v) Guttation
(H)
(i) Base of mid brain
(ii) 2 cells
(iii) Hind brain
(iv) Reproductive system
(v) Magnesium
(a) With the help of schematic representation, briefly explain what happens when
(i) a colour blind man marries a normal woman?
(ii) a homozygous (pure) tall pea plant is crossed with a homozygous (pure) dwarf plant? [5]
(b)
(i) What is evolution?
(ii) Name two vestigial organs present in human.
(iii) List any two functions of auxin hormone.
(iv) The diagram given below represents one of the stages in the fertilisation of an egg.
Label the reproductive cells (1 and 2) and identify the stage of fertilisation. [5]
(a)
(i) Colour blind man (XCY)
Normal woman (XX)
| XC | Y |
X | XCX | XY |
X | XCX | XY |
XCX: Daughters will be carriers for colourblindnessXY: Sons will be normal
Hence, all the children of colour blind man and normal woman will have normal vision.
(i) Homozygous tall plant (TT)
Homozygous dwarf plant (tt)
| T | T |
t | Tt | Tt |
t | Tt | Tt |
All resulting plants produced after crossing pure tall and pure dwarf plants will be:Phenotype: Tall
Genotype: Heterozygous (Tt) tall
(b)
(i) Evolution is a slow and continous process where complex forms of life have emerged from the simple forms through millions of years.
(ii) Vermiform appendix, Wisdom teeth
(iii) Two functions of auxin are;
(iv) 1. Sperm
2. Ovum
Stage of fertilisation: Release of polar body from secondary oocyte
(a) Differentiate the following on the basis of what is given in the bracket.
(i) Leucocytes and thrombocytes (any one function)
(ii) Exocrine gland and endocrine gland (secretion)
(iii) Homozygous and heterozygous (define terms)
(iv) Transpiration and evaporation (process)
(v) Homo habilis and Neanderthal man (cranial capacity) [5]
(b)The two diagrams given below (A and B) represent the two types of cell division. Study the diagram and answer the questions that follow.
(i) Identify the type of cell division occurring in A and B.
(ii) Identify the stage in both the diagrams and give suitable reason in support.
(iii) Write down one point of difference between the two types of cell division.
(iv) Name the structure by which chromosomes are attached to spindle fibres. [5]
(i) Difference between Leucocytes and thrombocytes:
Leucocytes | Thrombocytes |
Act as a body’s defense mechanism by killing germs | Play an important role in blood clotting |
(ii) Difference between Exocrine gland and Endocrine gland:
Exocrine gland | Endocrine gland |
Gland that secretes its products directly on specified organ through ducts | Ductless gland that secretes its secretion into blood stream |
(iii) Difference between Homozygous and Heterozygous:
Homozygous | Heterozygous |
Similar pair of allele for particular trait | Dissimilar pair of allele for particular trait |
(v) Difference between Transpiration and Evaporation:
Transpiration | Evaporation |
Loss of water vapour from aerial parts of plant | Loss of water from surface of water bodies |
(vi) Difference between Antiseptics and Disinfectants:
Homo habilis | Neanderthal man |
Their cranial capacity was 680-735 cm3 | Their cranial capacity was about 1450cm3 |
(b)
(i) A. Mitosis
B. Meiosis
(ii) In both the diagrams, cell is at metaphase stage as chromosomes lie along the equatorial plane of the cell.
(iii)
Mitosis | Meiosis |
Occurs in somatic cells of body | Occurs in reproductive cells of body |
(iv) Each chromosome is attached to the spindle fibre by its centromere.
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