Science
The correct statements with reference to single celled organisms are:
(i) Complex substances are not broken down into simpler substances.
(ii) Simple diffusion is sufficient to meet the requirement of exchange of gases.
(iii) Specialised tissues perform different functions in the organism.
(iv) Entire surface of organism is in contact wih the environment for taking in food.
- (i) and (iii)
- (ii) and (iii)
- (ii) and (iv)
- (i) and (iv)
Related Questions
Consider the following statements in connection with the functions of the blood vessels marked A and B in the diagram of a human heart as shown.
(i) Blood vessel A — It carries carbon dioxide rich blood from the lungs.
(ii) Blood vessel B — It carries oxygen rich blood from the lungs.
(iii) Blood vessel B — Left atrium relaxes as it receives blood from this blood vessel.
(iv) Blood vessel A — Right atrium has thick muscular wall as it has to pump blood to this blood vessel.
The correct statements are
- (i) and (ii) only
- (ii) and (iii) only
- (ii), (iii) and (iv)
- (i), (ii) and (iii)
In living organisms during respiration which of the following products are not formed if oxygen is not available?
- Carbon dioxide + Water
- Carbon dioxide + Alcohol
- Lactic acid + Alcohol
- Carbon dioxide + Lactic acid
Which one among the following is not removed as a waste product from the body of a plant?
- Resins and Gums
- Urea
- Dry Leaves
- Excess water
Which of the following statements are correct in reference to the role of A (shown in the given diagram) during a breathing cycle in human beings?
(i) It helps to decrease the residual volume of the air in lungs.
(ii) It flattens as we inhale.
(iii) It gets raised as we inhale.
(iv) It helps the chest cavity to become larger.
- (ii) and (iv)
- (iii) and (iv)
- (i) and (ii)
- (i), (ii) and (iv)