BIOLOGY
PAPER - 1
(Three hours)
Part - I
Question 1
(a) Give one significant difference between each of the following:
(i) Plasmolysis and Deplasmolysis.
(ii) Tendon and Ligament.
(iii) Threatened and endangered species.
(iv) Vasectomy and Tubectomy.
(v) Absorption spectrum and Action spectrum.
(b) Explain what would happen if:
(i) A green plant is exposed to green light only.
(ii) The cerebellum is injured.
(iii) Short day plants are exposed to red light followed by exposure to far-red light.
(iv) There is over-secretion of growth hormone after adolescence.
(v) A flower bud is emasculated and auxin is applied on the stigma.
(c) Each of the following questions / statements have four suggested answers. Rewrite the correct answer in each case:
(i) Which one of the following does not depend on a large surface area for its efficient functioning?
(A) A root hair
(B) An alveolus of the lungs
(C) A villus of the small intestine
(D) A ventricle of the human heart.
(ii) In a non-woody herbaceous plant, support is provided by:
(A) Turgor pressure on cell walls
(B) Atmospheric pressure on cells
(C) Suction pressure of the cells
(D) Root pressure.
(iii) The storage of sugar as glycogen in the liver is increased in the presence of:
(A) Thyroxin
(B) Rennin
(C) Insulin
(D) Adrenalin
(iv) The specific function of light energy in the process of photosynthesis is to:
(A) Reduce carbon dioxide
(B) Synthesise glucose
(C) Activate chlorophyll
(D) Split water
(v) Which one of the following helps the eye to adjust the focal length of the lens?
(A) Cornea
(B) Aquous humour
(C) Ciliary body
(D) Conjunctiva
(vi) Introduction of dead or weak microbes into the body is known as:
(A) Immunisation
(B) Vaccine
(C) Sterilization
(D) Vaccination
(d) Mention the most significant function of the following:
(i) Ear ossicles
(ii) Hyaluronidase
(iii) Thylakoid membranes
(iv) Pericycle
(v) Piameter
(vi) Lymphocytes
Please refer to attached file for ISC Question Papers 2013 Biology