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This exam covers key concepts in biology and chemistry, focusing on the functions of different parts of the brain, neuron types, methods of reproduction in yeast, chemical reactions, and properties of substances. Student…
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Explain the functions of cerebrum, cerebellum, medulla and spinal cord.
Cerebrum: higher functions; Cerebellum: balance; Medulla: autonomic functions; Spinal cord: reflexes.
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How does chemical co-ordination take place in animals?
Through hormones released into the bloodstream affecting target organs.
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Rajesh observed a patch of greenish black powdery mass on a stale piece of bread. a. Name the organism responsible for this and its specific mode of asexual reproduction. b. Name its vegetative and reproductive parts.
Organism: Mold; Asexual reproduction: Spores; Vegetative part: Mycelium; Reproductive part: Sporangium.
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On seeing prey, a tiger runs towards it at a tremendous speed? What causes the movement in its muscles? How does the cellular components of muscle changes during the event?
Muscle contraction caused by nerve impulses; ATP and calcium ions involved.
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Plants do not have any nervous system, but yet if we touch a sensitive plant, some observable changes take place in its leaves. Explain how this plant responds to the external stimuli and how it is communicated?
Response via turgor pressure changes; communication through chemical signals.
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Answer the following: i. Write the chemical name and formula of the compound formed when hydrochloric acid reacts with sodium hydroxide. ii. Why are antacids taken by people suffering from acidity?
i. Sodium chloride, NaCl; ii. To neutralize excess stomach acid.
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Answer the following (any three): i. Write the chemical name and formula of baking soda. ii. What happens when baking soda is: a) Heated strongly? b) Added to dilute acetic acid? iii. Write the chemical equation for the reaction of baking soda with dilute hydrochloric acid. iv. Give two uses of baking soda.
i. Sodium bicarbonate, NaHCO3; ii. a) Decomposes; b) Produces carbon dioxide; iii. NaHCO3 + HCl → NaCl + H2O + CO2; iv. Baking, antacid.
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Answer the following (any three): i. Write the chemical name and formula of calcium sulphate (gypsum). ii. What happens when gypsum is heated to 373 K? iii. Write the chemical equation for the above reaction. iv. Give two uses of calcium sulphate.
i. Calcium sulphate, CaSO4; ii. Forms plaster of Paris; iii. CaSO4·2H2O → CaSO4 + 1/2 H2O; iv. Construction, plaster.
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Classify the following into reflex action and involuntary actions of brain: i. Beating of heart ii. Withdrawing your hand immediately on touching a hot object. iii. Change in size of pupil in response to intensity of light. iv. Sneezing v. Pulling up the leg immediately when foot falls on some sharp object.
Reflex actions: ii, iv, v; Involuntary actions: i, iii.
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List three points of difference between nervous and hormonal mechanisms for control coordination in animals.
Nervous: fast, short-term; Hormonal: slow, long-term.
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Observe the given figure and identify the labelled parts a, b, c and d.
Identify parts based on the diagram.
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The male reproductive organ responsible for the formation of germ cells is located outside the abdominal cavity.
Testes are located outside the abdominal cavity.
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Name the hormone that needs to be administered to: i. increase the height of a dwarf plant. ii. cause rapid cell division in fruits and seeds.
i. Gibberellins; ii. Auxins.
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Following are the statements about the different parts of the brain. Select the correct statements.
Statements i, ii, and iii are correct.
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Given below is the diagram showing the role of different types of neuron in the reflex action mechanism? Choose the correct labels for A, B and C from the table below by identifying different neurons.
Sensory - Relay - Motor
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Yeast multiplies by which of the following methods?
Budding
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Choose the correct order of the stages of binary fission in Leishmania.
I, II, III, V, IV
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The following two questions consist of two statements - Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below: Assertion (A): Gustatory receptors detect taste. Reason (R): Olfactory receptors are present in cerebellum.
A is true but R is false.
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Which of the following is an amphoteric oxide?
Al2O3
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Which of the following substances turns blue litmus paper red?
Hydrochloric acid
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The following question consists of two statements - Assertion (A) and Reason (R). Answer by selecting the appropriate option given below: Assertion (A): Dry HCl gas does not change the colour of dry blue litmus paper. Reason (R): HCl produces hydrogen ions only in the presence of water.
Both A and R are true, and R is the correct explanation of A.
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