Free Circulation MCQs with Answers
695 Circulation MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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Read the Circulation notesFree MDCAT chapter notes with key terms695 questions · page 27 of 35
- A. Cell wall
- B. Starch deposit
- C. Enzyme
- D. DNA replication
Explanation: Answer is "Enzyme"Explanation: A plant requires nitrogen and sulphur for its enzyme.
Correct answer: Enzyme- A. Two-meter
- B. Five meter
- C. One meter
- D. Half meter
Explanation: nswer is "One meter"Explanation: A rye plant less than one meter tall has some 14 million branch roots of a combined length of over 600…
Correct answer: One meter- A. Endocytosis
- B. Diffusion
- C. Active transport
- D. None of the above
Explanation: Answer is "Diffusion"Explanation: Diffusion cause substances to move across membranes without expenditure of cellular energy.
Correct answer: Diffusion- A. Cortex cells of root
- B. Pericycle
- C. Endodermis cells of roots
- D. Xylem
Explanation: Answer is "Endodermis cells of roots"Explanation: The casparian strip separates the extracellular space in the root into two compartments…
Correct answer: Endodermis cells of roots- A. 50% of vascular plants
- B. 70% 0f angiosperms
- C. 70% of gymnosperms
- D. 90% of angiosperms
Explanation: Answer is "90% of angiosperms"Explanation: Mycorrhizal fungi get sugar, and shelter from the plant and in exchange increase the plant's…
Correct answer: 90% of angiosperms- A. Osmotic
- B. Solute
- C. Pressure
- D. Generator
Explanation: Answer is "Pressure"Explanation: Force exerted by protoplast against cell wall is called pressure potential.
Correct answer: Pressure- A. Transpiration
- B. Conduction
- C. Guttation
- D. Deplasmolysis
Explanation: Answer is "Guttation"Explanation: Closely associated with root pressure is a phenomenon called guttation or exudation.
Correct answer: Guttation- A. Adhesion
- B. Cohesion
- C. Tensile
- D. Imbibition
Explanation: Answer is "Cohesion"Explanation: The force of attraction between water molecules is cohesion.
Correct answer: Cohesion- A. 200 meters
- B. 400 feets
- C. 300 meters
- D. 500 feets
Explanation: Answer is "200 meters"Explanation: It is provided when this water chain is pulled up in the xylem.
Correct answer: 200 meters- A. 100
- B. 200
- C. 300
- D. 150
Explanation: Answer is "200"Explanation: The volume of dry seed increase up to 200 times by imbibition, as a result, the seed coat ruptures and makes…
Correct answer: 200- A. Metabolism
- B. Respiration
- C. Photosynthesis
- D. Vernalisation
Explanation: Answer is "Photosynthesis"Explanation: 1% of the absorbed water is used by plants in its activities during photosynthesis.
Correct answer: Photosynthesis- A. 2mh-1
- B. 3mh-1
- C. 8mh-1
- D. 10mh-1
Explanation: Answer is "8mh-1"Explanation: Large quantities of water are carried at relatively high speed, upto 8mh-1being recorded in tall trees, and…
Correct answer: 8mh-1- A. Cuticular transpiration
- B. Stomatal transpiration
- C. Lenticular transpiration
- D. Stem transpiration
Explanation: Answer is "Lenticular transpiration"Explanation: Lenticular transpiration is the loss of water vapours through lenticels present in the…
Correct answer: Lenticular transpiration- A. Acidification of environment
- B. Turgidity of guard cells
- C. Uptake of K ions of guard cells
- D. Flaccidity of guard cells
Explanation: Answer is "Flaccidity of guard cells"Explanation: Exposure to blue light, which is also effective in photosynthesis has been shown to…
Correct answer: Flaccidity of guard cells- A. Gibberellins
- B. Ethane
- C. Abscisic acid
- D. Cytokinine
Explanation: Answer is "Abscisis acid"Explanation: Hormones are involved in stomatal movement in plants.
Correct answer: Abscisic acid- A. Increased
- B. Does not change
- C. Decreased
- D. First increased and decreased
Explanation: Answer is "Decreased"Explanation: When leaves transpire the water potential of mesophyll cells is decreased.
Correct answer: Decreased- A. Source
- B. Sink
- C. Producer
- D. Source and sink both
Explanation: Answer is "Source and sink both"Root of beet acts as source and sink both.
Correct answer: Source and sink both- A. 1 meter/8 years
- B. 1 meter/day
- C. 1 meter/hour
- D. 20cm/min
Explanation: Answer is "1 meter/hour"Average velocity of movement of sugars in phloem is 1 meter/hour.
Correct answer: 1 meter/hour- A. Apoplast pathway
- B. Vacuolar pathway
- C. Symplast pathway
- D. None of these
Explanation: Answer is "Symplast pathway"While moving towards the sieve elements sucrose takes the symplast pathway mostly.The symplast pathway refers…
Correct answer: Symplast pathway- A. Hydrophytes
- B. Xerophytes
- C. Mesophytes
- D. Halophytes
Explanation: Xerophytes are plants that are adapted to arid or desert environments where water availability is limited.
Correct answer: Xerophytes