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Q1. Trachea do not collapse when there is not much air because they are:
(a) thick and muscular
(b) having cartilaginous rings
(c) have valves
(d) supported by larynx.
(b) having cartilaginous rings
Q2. The site of photosynthesis in the cells of a leaf is
(a) chloroplast
(b) mitochondria
(c) cytoplasm
(d) protoplasm
(a) chloroplast
Q3. Which of the following help in protecting the inner lining of the stomach from the harmful effect of hydrochloric acid?
a) Mucus
b) Pepsin
c) Trypsin
d) Bile
(a) Mucus
Q4. Sometimes we get painful cramps in our leg muscles after running for a long time due to the accumulation of:
a) Hydrochloric acid
b) Fat
c) Carbon dioxide
d) Lactic acid
(d) Lactic acid
Q5. Which of the following events in the mouth cavity will be affected if salivary amylase is lacking in the saliva?
(a) Starch breaking down into sugars.
(b) Proteins breaking down into amino acids.
(c) Absorption of vitamins.
(d) Fats breaking down into fatty acids and glycerol.
(a) Starch breaking down into sugars.
Q6. During contraction of heart, what prevents backflow of blood?
(a) Thin walls of atria
(b) Thick muscular walls of ventricles
(c) Valves in heart
(d) All of the above
(c) Valves in heart
Q7. Which region of the alimentary canal absorbs the digested food?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Liver
(b) Small intestine
Q8. When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour
(b) carbon dioxide
Q9. What prevents backflow of blood inside the heart during contraction?
(a) Valves in heart
(b) Thick muscular walls of ventricles
(c) Thin walls of atria
(d) All of the above
(a) Valves in heart
Q10. In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?
(a) Pisces and amphibians
(b) Amphibians and reptiles
(c) Amphibians only
(d) Pisces only
(d) Pisces only
Q11. Which of the following equations is the summary of photosynthesis?
(a) 6CO2 + 12H2O → C6H12O6 + 6O2 + 6H2O
(b) 6CO2 + H2O + Sunlight → C6H12O6 + O2 + 6H2O
(c) 6CO2 + 12H2O + Chlorophyll + Sunlight → C6H12O6 + 6O2 + 6H2O
(d) 6CO2 + 12H2O + Chlorophyll + Sunlight → C6H12O6 + 6CO2 + 6H2O
(c) 6CO2 + 12H2O + Chlorophyll + Sunlight → C6H12O6 + 6O2 + 6H2O
Q12. Which is the first enzyme to mix with food i the digestive tract?
(a) Pepsin
(b) Cellulose
(c) Amylase
(d) Trypsin
(c) Amylase
Q13. Lack of oxygen in muscles often leads to cramps among cricketers. This results due to
(a) conversion of pyruvate to ethanol
(b) conversion of pyruvate to glucose
(c) non conversion of glucose to pyruvate
(d) conversion of pyruvate to lactic acid
(d) conversion of pyruvate to lactic acid
Q14. Name the substances whose build up in the muscles during vigorous physical exercise may cause cramps?
(a) Ethanol + Carbon dioxide + Energy
(b) Lactic acid + Energy
(c) Carbon dioxide + Water + Energy
(d) Pyruvate
(b) Lactic acid + Energy
Q15. The breakdown of pyruvate to give carbon di-oxide, water and energy takes place in
(a) cytoplasm
(b) mitochondria
(c) chloroplast
(d) nucleus
(b) mitochondria
Q16. The filtration units of kidneys are called –
(a) Ureter
(b) Urethra
(c) Neurons
(d) nephrons.
(d) nephrons.
Q17. Glycolysis process occurs in which part of the cell?
(a) Cytoplasm
(b) Nucleus
(c) Mitochondria
(d) Chloroplast
(a) Cytoplasm
Q18. In which of the following group/ groups of animals, heart does not pump oxygenated
blood to different parts of the body?
(a) Pisces only
(b) Amphibians only
(c) Amphibians and reptiles only
(d) Pisces and amphibians
(a) Pisces only
Q19. The respiratory pigment in human beings is:
(a) carotene
(b) chlorophyll
(c) haemoglobin
(d) mitochondria
(c) haemoglobin
Q20. The movement of food in phloem is called:
(a) transpiration
(b) translocation
(c) respiration
(d) evaporation
(b) translocation
Q21. Name the pores in a leaf through which respi-ratory exchange of gases takes place.
(a) Lenticels
(b) Vacuoles
(c) Xylem
(d) Stomata
(d) Stomata
Q22. Name the part of alimentary canal receiving bile from the liver.
(a) Oesophagus
(b) Stomach
(c) Small intestine
(d) Large intestine
(c) Small intestine
Q23. Name a circulatory fluid in the human body other than blood.
(a) Platelets
(b) RBC
(c) Lymph
(d) Plasma
(c) Lymph
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