CBSE Class 10 Science 2020 · Paper 31/4/1 · Question 5
Which one of the following statements is correct about the human circulatory system ?
- (a)Blood transports only oxygen and not carbon dioxide.
- (b)Human heart has five chambers.
- (c)Valves ensure that the blood does not flow backwards.
- (d)Both oxygen-rich and oxygen-deficient blood gets mixed in the heart.
Answer
(c) Valves ensure that the blood does not flow backwards.
🔒 Step-by-step solution
Sign up free to see every step of how it is worked out.
From the board papers
More questions from Life Processes
Class 10 Science — every question with an expert-verified, step-by-step solution.
- Q1 The kidneys in human beings are a part of the system for
- Q1 Why is diffusion insufficient to meet the oxygen requirements of…
- Q2 The xylem in plants are responsible for
- Q2 What criteria do we use to decide whether something is alive?
- Q3 The autotrophic mode of nutrition requires
- Q3 What are outside raw materials used for by an organism?
- Q4 The breakdown of pyruvate to give carbon dioxide, water and ener…
- Q4 What processes would you consider essential for maintaining life?
- Q5 How are fats digested in our bodies? Where does this process take…
- Q6 What is the role of saliva in the digestion of food?
- Q7 What are the necessary conditions for autotrophic nutrition and…
- Q8 What are the differences between aerobic and anaerobic respiration…
All 431 questions on Life Processes → Browse all Science chapters →