Biology
Assertion (A): The main pulmonary artery pumps oxygenated blood from the right ventricle into the lungs.
Reason (R): Inside the lungs, the artery divides and divides several times to form capillaries around the air sacs.
- A is True, and R is false.
- A is False, and R is true.
- Both A and R are true.
- Both A and R are false.
Related Questions
A person is suffering from kidney failure. He is put on a dialysis machine by the doctors. The osmotic pressure of dialysis fluid should be:
- equal to that of blood.
- more than that of blood.
- less than that of blood.
- equal to zero.
A squirrel is in a scary situation. The secreted adrenaline prepares the body to meet the situation. Which of the following is NOT TRUE for this situation?
- Adrenaline prepares the body to fight danger.
- Extra energy and strength are provided to the body.
- At the time of the stress, fewer hormones are released into the blood.
- Adrenaline prepares the body to run away from danger.
Given below are some common reflexes in humans.
i. Quick closing of the eyelids when a strong beam of light is flashed across.
ii. Apply brakes to your vehicle if anything suddenly comes in front.
iii. Playing a musical instrument.
iv. Coughing reflex, when the food is swallowed, enters the windpipe.
The conditioned reflexes are:
- i and ii
- ii and iii
- iii and iv
- i and iv
Electrons released on splitting of water molecules in photosynthesis are used in producing:
- NADP
- NADPH
- ATP
- O2