Read the explanations given below and name the structures:
Example: The tubules which produce sperms.
Answer: Seminiferous tubules
(a) The canal through which the testes descend down into the scrotum just before the birth of a male
baby.
(b) The part of the brain that regulates the peristaltic movement of the alimentary canal.
(c) A structure that collects the soundwaves and conducts them through the external auditory canal.
(d) The point of attachment of two chromatids of a chromosome.
(e) Regulation of the opening and closing of stomata.
Arrange the terms in each group in the correct order. Write them in a logical sequence beginning with
the term that is underlined.
(a) Palisade cells, Cuticle, Upper epidermis, Spongy cells.
(b) Hepatic portal vein, Stomach, Hepatic vein, Liver.
(c) Cyton, Dendrites, Synaptic cleft, Axon endings.
(d) Insulin release, High blood sugar, Lowers blood sugar, Stimulates glucose uptake from blood.
(e) Sperm duct, Seminiferous tubule, Epididymis, Efferent ducts.
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.
Many nuclear power plants are constructed near water sources. They use water for cooling their
machinery and release it back into the water stream. Identify the kind of pollution caused.
(a) Radiation pollution (b) Water pollution
(c) Industrial pollution (d) Thermal pollution
Assertion(A): Arachnoid layer helps in speeding up the transmission of nerve impulses along the axons.
Reason(R): Axon endings at the synapse secrete acetylene.
(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.
A phase of cell division where the spindle fibres disappear is:
(a) Telophase (b) Prophase
(c) Metaphase (d) Anaphase
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.
Ajay and Vijay are siblings. Ajay can roll his tongue while Vijay cannot. What is the genotype of their
parents?
(a) Both the parents are homozygous dominant.
(b) Both the parents are homozygous recessive.
(c) One parent is homozygous dominant, and the other is homozygous recessive.
(d) Both the parents are heterozygous dominant.
The optimum temperature for photosynthesis is:
(a) 10 – 15°C (b) 60 – 65°C
(c) 40 – 45°C (d) 25 – 35°C
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