Biology ICSE Class 7 Important Questions Chapter 8 Excretion in Animals and Plants
Extra Questions
Question 1.
Name the various waste materials produced in the human body
Answer:
- Nitrogenous waste products like ammonia, urea and uric acid – These are removed through kidneys.
- Extra salt – Mainly secreted through kidneys and also skin.
- Bile pigments – Mostly released in faeces while some in urine.
- Carbon dioxide and water – CO, is removed through, lungs while water is excreted through kidneys as urine and through sweat glands as sweet in your skin.
Question 2.
Name few excretory organs in humans.
Answer:
Kidneys, skin, lungs, liver.
Question 3.
Write briefly about liver as an excretory organ.
Answer:
Liver produces bile pigments from the haemoglobin of broken RBCs. It also converts the toxic ammonia produced in the cells into urea, which is less toxic. Urea is then carried to the kidneys and excreted.
Question 3.
Name three non-nitrogenous and three nitrogenous waste material produced by plants.
Answer:
Non-nitrogenous wastes are tannins, resins and latex. Nitrogenous wastes are caffeine, quinine and morphine.
Question 4.
Where is the waste material of plants deposited ?
Answer:
Plant wastes like tannins, resins, gums etc are stored in leaves, bark, dead wood and other special cells.
Question 5.
Fill in the blanks
(i) In an adult male, the average capacity of the urinary – bladder varies from …………. ml to ……….ml
Answer:
In an adult male, the average capacity of the urinary bladder varies from 150 ml to 300 ml
(ii) Each kidney in longitudinal section shows an outer dark region called …………… and an inner lighter region called …………
Answer:
Each kidney in longitudinal section shows an outer dark region called cortex and an inner lighter region called
medulla.
(iii) A ……….. is the functional unit of a kidney.
Answer:
A nephron is the functional unit of a kidney.
(iv) ………… of rubber plant is used for making rubber
commercially.
Ans. Latex of rubber plant is used for making rubber commercially.
(v) Quinine is a plant waste which gets deposited in the bark of …………… tree.
Answer:
Quinine is a plant waste which gets deposited in the bark of cinchona tree.
(vi) Morphine, a plant waste, is primarily used in treating ………….
Answer:
Morphine, a plant waste, is primarily used in treating acute pain.
(vii) Liver eliminates …………. from our body.
Answer:
Liver eliminates bile pigments from our body.
ICSE Class 7 Biology Important Questions