List of top Science Questions on Life Processes

What is excretion ? Write the names of its two main parts.
Define respiration.
Peptic ulcer can be caused by
Explain why respiration is considered an exothermic reaction. Give the chemical equation for this reaction.
Name the parts marked as 'A' and 'B' in the given diagram. Write in detail the changes that take place in a flower when the product of 'B' reaches 'A' till a fruit is formed.
parts marked as ’A’ and ’B’
What is the first step of cellular respiration? In which part of the cell does it occur ? Write the equation for the process of breakdown of glucose in a human cell : (i) in the presence of oxygen (ii) due to lack of oxygen
In human female reproductive system state the changes that take place once fertilisation has taken place. Write the role of placenta in this process. What happens when the egg is not fertilised ?
Explain with the help of a flow chart that in human beings father is responsible for the sex (male or female) of the child.
Name the tissues which form the vascular bundle. State their function in plants.
In a bisexual flower the male gametes are present in the :
Assertion (A) : In large animals, oxygen can reach different parts of the animal's body easily.
Reason (R) : Respiratory pigments take up oxygen from the air and carry it to body tissues.
Name the blood vessel that brings (i) oxygenated blood (ii) deoxygenated blood to the human heart. Also name that chamber of the heart which receives deoxygenated blood and state how deoxygenated blood from this chamber is sent to lungs for oxygenation.
Consider the following food chain:
Grass \( \rightarrow \) Grasshopper \( \rightarrow \) Frog \( \rightarrow \) Snake \( \rightarrow \) Eagle
If the amount of energy available at third trophic level is 50 kJ, the available energy at the producer level was:
In human alimentary canal, the digestive juice secreted by the gastric glands are:
The basic filtration unit of the excretory system in human beings is:
Which one of the following is not an excretory product in plants?
The structural and functional unit of kidney is called:
Hydrilla is found:
In fish, respiration takes place through:
Systolic blood pressure of a healthy person is:
Which of the following is not an excretory organ of humans?
How many phosphates are there in ATP?
Which of the following has the fastest heartbeat?
Photosynthesis takes place during:
Which of the following is a cellular fuel?