BIOLOGY

SCIENCE Paper – 3

SECTION I (40 Marks)
Attempt all questions from this Section

Question 1
(a) Name the following: [5]
(i) The hormone that regulates the basal metabolic rate.
(ii) The part of the internal ear related to the static balance of the body.
(iii) The soluble protein in blood plasma responsible for blood clotting.
(iv) The gaseous plant hormone.
(v) The uptake of mineral ions against the concentration gradient.

(b) Choose the correct answer from the four options given for each below: [5]
(i) The rate of transpiration will be fastest when the day is:
A. Hot, humid and windy
B. Cool, humid and windy
C. Hot, humid and still
D. Hot, dry and windy
(ii) Cytokinins are predominantly present in:
A. Permanent tissues
B. Meristematic tissues
C. Endodermis
D. Cortical region
(iii) A cell has five pairs of chromosomes. After mitotic division, the number of chromosomes in the daughter cells will be:
A. Five
B. Ten
C. Twenty
D. Forty
(iv) Learning is related to:
A. Cerebrum
B. Cerebellum
C. Medulla Oblongata
D. Hypothalamus
(v) The most primitive ancestor of man is:
A. Homo habilis
B. Cro- magnon
C. Neanderthal
D. Australopithecus

(c) The following paragraph is related to absorption of water from the soil. Complete the following paragraph by selecting the correct word from those given below. You may use a term only once.
exosmosis, hypertonic, osmosis, isotonic, hypotonic, cortical, endosmosis, phloem.  [5]
Water enters the root hair from the soil by the process of (i) __________. This is because the solution in the soil is (ii) __________ whereas the cell sap in the root hair cell is (iii) __________. The water then passes through the (iv) __________ cells by cell to cell (v) __________ and reaches the xylem of the root.

(d) Give the exact location of each of the following structures:
(i) Corpus Callosum
(ii) Adrenal gland
(iii) Acrosome
(iv) Amnion
(v) Monocytes [5]

(e) Given below are five sets of terms. In each case arrange and rewrite each set so as to be in a logical sequence.
One is done as an example for you:
Eg: Large intestine, stomach, mouth, small intestine, oesophagus.
Ans: Mouth, oesophagus, stomach, small intestine, large intestine.
(i) Metaphase, interphase, anaphase, prophase, telophase
(ii) Vagina, sperm, uterus, oviduct, cervix
(iii) Pinna, cochlea, tympanum, ossicles, auditory canal
(iv) Posterior venacava, renal artery, aorta, renal vein, kidney
(v) Synapse, axon endings, cyton, node of Ranvier, dendrite             [5]

(f) Identify the odd term in each set and name the category to which the remaining 3 belong.
Example: Ovary, Fallopian tube, Ureter, Uterus.
Odd term: Ureter
Category: Parts of female reproductive system.
(i) Basophil, Neutrophil, Eosinophil, Lymphocyte
(ii) Pulmonary vein, Hepatic vein, Renal vein, Post caval
(iii) Gibberellin, Auxin, Vasopressin, Abscisic acid
(iv) Wind energy, Tidal energy, Petroleum, Solar energy
(v) Plastic, Paper, Glass, Aluminium [5]

(g) The diagram given below represents a plant growing in a glass jar. The glass jar is placed near a window. Study the diagram and answer the questions that follow:
(i) Name the tropic movements shown by the shoot and roots.
(ii) What is the stimulus that made the shoot bend towards the window?
(iii) Which plant hormone caused the above effect?
(iv) Explain the role of the hormone in bending the shoot towards the window. [5]

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