ISC Board Important Questions
Q1. a) (i). Absorption spectrum and Action spectrum
Answer: A curve obtained by plotting the amount of absorption of different wavelengths of light by a particular pigment is called absorption spectrum of that pigment. An action spectrum is a curve showing the effectiveness of different wavelengths of light in stimulating the process being investigated. (ii). Heart Wood and Sap Wood
Answer: In most trees the outer light colored region of the wood is distinct from the inner dark colored region. The former is said to be Sapwood (alburnum) and the latter Heartwood (duramen). The Sapwood consists of living cells which are still functional whereas the heartwood is composed of dead cells which become impregnated with resins, gummy or tannin like substances and consequently are not suited for conduction. b) (i). What makes the apical meristem of the root sub-terminal? Answer: A single tetrahedral apical cell is the structural and functional unit of the root apical meristem. The division in this apical cell in the upper plant. Three sides give rise to tissues to the body of the root, and the root cap is derived from its base. (ii). Name the enzyme which catalyses bicarbonate formation in RBCs. Answer: Carbonic anhydrase.
(iii). Which form of phytochrome induces flowering in SDP?
Answer: Far-red light
c). Fill in the blanks :
(i) The pigment in red muscle fibre is ………
(ii) Amount of blood pumped by heart per minute is called ……… (iii) Ethylene accelerates ……… of leaves, flowers and fruits. (iv) The biological name of Tulsi plant is ………
(v) ……… is the causative agent of Cholera.
Answer: (i) Myoglobin. (ii) Cardiac output. (iii) Growth. (iv) Ocimum sanctum. (v) Vibria cholerae. d). Give the contributions of the following scientists:
(i) William Roentgen
(ii) Marshall Hall
(iii) Godfrey Houns field
(v) Robert Koch
Answer: (i) Discovery of X-rays.
(ii) Circulatory physiology – The father of...
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