A scientist wanted to conduct a genetic experiment on mice. He cut the tails of all the mice and made them reproduce. What will be the phenotype of the offsprings?
(a) All the offsprings will be tailless.
(b) There will be a mix of tailed and tailless offsprings.
(c) All the offsprings will have tails.
(d) Tail of the offsprings cannot be predicted.
(c) All the offsprings will have tails.
Explanation: Cutting a mouse’s tail is an acquired change and does not alter the DNA in germ cells. Therefore, it cannot be inherited by the offspring.
More ICSE Moderate level questions
Name the following: (a) The fully developed part of the ovary containing a mature ovum. (b) A waxy layer on the upper epidermis of leaves meant to reduce Transpiration. (c) The ear ossicle which opens into the oval window of Cochlea. (d) The physiological process which is the starting point of all food chains. (e) An insect which is a classic example of natural selection due to industrial melanism.
Give the biological/technical terms for the following: (a) The tropic movement wherein the tendrils of a pea plant twine around a support. (b) A defect in our eye in which some parts of the object are in focus while the other parts are blurred. (c) The type of waste generated in hospitals and pathological laboratories. (d) The surgical technique for females that can be used to prevent pregnancy. (e) The evolutionary process by which new species arise from the existing one.
Arrange the following in a logical sequence: (a) Australopithecus, Cro-Magnon, Homo erectus, Neanderthal man. (b) Pupil, Aqueous humour, Retina, Vitreous humour. (c) Effector, Receptor, Motor neuron, Sensory neuron. (d) Loop of Henle, Distal convoluted tubule, Bowman’s Capsule, Proximal convoluted tubule. (e) Water vapour, Soil water, Leaves, Ascent of Sap.
(a) Who proposed the theory of Natural Selection? (b) Name the organism which was used as an example to explain Industrial Melanism.
Give any two characteristic features of a Cro-Magnon man.
What are Vestigial organs? Give one example of a vestigial structure in the human mouth.
Industrial melanism was observed in: (a) Mice (b) Peppered Moth (c) House Flies (d) Crow
Differentiate between Australopithecus and Modern man based on body hair.
What is the scientific name of modern man?
Assertion (A): Seminal vesicles pour an alkaline secretion into the semen as it passes through the ureter. Reason (R): The female vagina is acidic and needs to be neutralized for sperm survival. (a) A is True and R is False (b) A is False and R is True (c) Both A and R are True (d) Both A and R are False
Assertion (A): A turgid plant cell is in a balanced state. Reason (R): In a turgid cell, turgor pressure and wall pressure are equal and in the same direction. (a) A is True and R is False (b) A is False and R is True (c) Both A and R are True (d) Both A and R are False
Assertion (A): Deficiency of Antidiuretic hormone causes an increase in urination. Reason (R): Antidiuretic hormone acts on the kidney to reabsorb water from the kidney tubules. (a) A is True and R is False (b) A is False and R is True (c) Both A and R are True (d) Both A and R are False
