List of top Science Questions on Life Processes asked in CBSE Class X

What is vegetative propagation? Is this process sexual or asexual? Justify your answer.
List three advantages of practising the process/technique by the farmers.
Select two plants from the following which are obtained by this technique: Banana, Papaya, Jasmine, Mustard
The part of a seed that stores food, the future root, and the future shoot respectively are:
Which of the following statement (s) is (are) true about human heart?
(a) Right atrium receives oxygenated blood from lungs through pulmonary artery.
(b) Left atrium transfers oxygenated blood to left ventricle which sends it to various parts of the body.
(c) Right atrium receives deoxygenated blood from different parts of the body through vena cava.
(d) Left atrium transfers oxygenated blood to aorta which sends it to different parts of the body.
Draw the diagram of an open stomatal pore and label (I) Guard cells, and (II) Chloroplast on it. Mention two functions performed by stomata.
Name a plant growth hormone synthesized at the shoot tip. Explain its effect on the growth of a plant in response to light.
Write the other name given to lymph. State its two functions.
(A) How is the movement of leaves of a sensitive plant different from the downward movement of the roots ?
OR
(B) There is a hormone which regulates carbohydrate, protein and fat metabolism in our body. Name the hormone and the gland which secretes it. Why is it important for us to have iodised salt in our diet?
Identify the food chain in which the organisms of the second trophic level are missing :
Assertion (A): Accumulation of harmful chemicals is maximum in the organisms at the highest trophic level of a food chain.
Reason (R) : Harmful chemicals are sprayed on the crops to protect them from diseases and pests.
Assertion (A): The rate of breathing in aquatic organisms is much faster than in terrestrial organisms.
Reason (R) :The amount of oxygen dissolved in water is very high as compared to the amount of oxygen in air.