9 On a cold day more urine is produced because
a The body takes in more water
b The blood has more water
c The Kidneys become more active
d Very little or no sweat is produced
10 Diffusion is a different form of osmosis because it involves in movement of
a molecules from law concentration to high concentration
b solvent molecules
c solute molecules
d molecules from high concentration to low concentration
Answers
Q4) Tick (✓) only the correct choice among the followings :
(1) The Universal donor is :
(a) A
(b) l
(c) AB
(d) O ✓
Explanation : Basically blood groups are differentiated on the basis of antigens and antibodies. In blood group O there are no antigens present but have both ab antibodies in their plasma.
(2) Blood transfusion is required during :
(a) Injury ✓
(b) Emergency
(c) Both
(d) None of these
Explanation : Due to injury blood will flow out, so u will have to give blood to patients
(3) The heart consists of auricles :
(a) two ✓
(b) one
(c) three
(d) none of these
Explanation : Heart consists of 2 auricle.
(4) The normal pulse rate is :
(a) 60 times per minute
(b) 72 times per minute ✓
(c) 80 times per minute
(d) None of these
Explanation : Normal pulse rate for a healthy person is 72 to 80 per minute.
(5) Plant wastes are:
(a) Gum
(b) Resins
(c) Latex
(d) All of these ✓
Explanation :
Gums are the waste material in plants, which is usually formed by breakdown of plants cellulose.
(6) The red coloured pigment of our blood is :
(a) Blood cells
(b) Haemoglobin ✓
(c) White blood cells
(d) Plasma
Explanation : Red coloured pigment in our blood is Haemoglobin. It helps us in transporting oxygen in blood.
(7) The transport tissue in the plant is the :
(a) Cambium
(b) Xylem and Phloem ✓
(c) Sclerenchyma
(d) All of these
Explanation : Xylem and Phloem are the special tissues in the plant which transport food and water.
(8) The function of white blood cells is to :
(a) carry oxygen
(b) carry carbon dioxide
(c) clot the blood
(d) fight infection ✓
Explanation : Functions of White blood cells is to fight against germs and bacterias which may enter into our body.
(9) On a cold day more urine is produced because
(a) The body takes in more water
(b) The blood has more water
(c) The Kidneys become more active
(d) Very little or no sweat is produced ✓
Explanation : During a hot day, we sweat more and during a cold day we do not sweat. Hence, more water is saved as we do not sweat.
(10) Diffusion is a different form of osmosis because it involves in movement of
(a) molecules from law concentration to high concentration
(b) solvent molecules
(c) solute molecules ✓
(d) molecules from high concentration to low concentration
Explanation :
Diffusion and osmosis both are different processes.
In diffusion the molecules move from area of higher concentration to area of lower concentration
While in osmosis, the molecules of solvents move from area of low concentration to area of high concentration.