Solution of Life Processes (Page No - 72 (Part - 2))- Biology by Lakhmir Singh, Class 10 | Extra Documents, Videos & Tests for Class 10 PDF Download

Question 33:
(a) Draw a labelled diagram of (z) a xylem vessel, and (ii) a sieve tube (or phloem).
(b) What are the differences between the transport of materials in xylem and phloem ?
Solution :

(a) (i)

The Structure of xylem vessels

(ii)

The Structure of phloem (made of sieve tubes)

(b)

Question 34:
Match the terms in column I with their uses in column II 

Solution : 

Question 35:
Define excretion. Name the excretory unit of a kidney.
Solution :
The process of removal of toxic waste from the body of an organism is called excretion. The excretory unit of a kidney is called nephron.

Question 36:
(a) What job is done by the kidneys ?
(b) What do kidneys excrete ?
(c) What is the name of the tubes which connect the kidneys to bladder ?
(d) What does the bladder in our body do ?
Solution :
(a) The kidneys remove the poisonous substance urea, other waste salts and excess water from the blood in the form of yellowish liquid called urine.(b) Urea.(c) Ureters.(d) Urinary bladder is a bag which stores the urine temporarily till it is excreted out.

Question 37:
Why do some people need to use a dialysis machine ? What does the machine do ?
Solution :
When there is a kidney failure then dialysis machine is used. Dialysis cleans the blood of a person by separating the waste substance (urea) from the blood.

Question 38:
What is the liquid part of the blood called ? What is the function of platelets in the blood ?
Solution :
The liquid part of the blood is called plasma. Platelets help in the coagulation of blood in a cut or wound.