LIFE PROCESSES-CBSE TEST PAPER-04[With Solution]
Life
Process class 10 Trend setter solved CBSE Test paper-04
SCIENCE & TECHNOLOGY (Class-10) Chapter 6 : Life Process
SCIENCE & TECHNOLOGY (Class-10) Chapter 6 : Life Process
1. Name the artificial method for the removal of
liquid nitrogenous waste from body. (1 mark)
Ans: Dialysis
Ans: Dialysis
2. Name
any three waste products of plants? (1 mark)
Ans: The gums, resins and latexes
Ans: The gums, resins and latexes
3. Name
three excretory organs of man. (1 mark)
Ans: lungs, kidney and skin
Ans: lungs, kidney and skin
4. Name
the part of plants which helps in transportation. (1 mark)
Ans: Phloem tissue
Ans: Phloem tissue
5. Name
the juice secreted by the liver. (1 mark)
Ans: Bile
Ans: Bile
6. What
is the function of digestive enzymes? (2 marks)
Ans: Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc. help in the breaking down of complex food particles into simple ones. These simple particles can be easily absorbed by the blood and thus transported to all the cells of the body.
Ans: Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc. help in the breaking down of complex food particles into simple ones. These simple particles can be easily absorbed by the blood and thus transported to all the cells of the body.
7. What
is the role of saliva in the digestion of food? (2 marks)
Ans: The salivary glands secrete the first of the digestive juices, the saliva. In the digestion process, the saliva helps the teeth and tongue to masticate and mix up the food thoroughly. Mucus in saliva helps in lubricating and adhering food particles into a bolus. Then the bolus conveyed to pharynx for further digestion. Lysosomes present in saliva acts as an antibacterial agent that prevents infection.
Ans: The salivary glands secrete the first of the digestive juices, the saliva. In the digestion process, the saliva helps the teeth and tongue to masticate and mix up the food thoroughly. Mucus in saliva helps in lubricating and adhering food particles into a bolus. Then the bolus conveyed to pharynx for further digestion. Lysosomes present in saliva acts as an antibacterial agent that prevents infection.
8.
Point out two differences between an artery and a vein. (2 marks)
Ans: Artery
Ans: Artery
a.
Vessels which carry blood from the heart to various body parts
b.
Arteries carry oxygenated blood from the heart except pulmonary artery
Vein
a.
Vessels which carry blood from the various body parts to the heart
b.
Veins carry deoxygenated blood from the various body parts except pulmonary vein
9. What
do you mean by double circulation
of blood? (2 marks)
Ans: The human heart is divided into four chambers − the right atrium, the right ventricle, the left atrium, and the left ventricle.
Ans: The human heart is divided into four chambers − the right atrium, the right ventricle, the left atrium, and the left ventricle.
Flow of blood in the heart :
·
The
heart has superior and inferior vena cava, which carries de-oxygenated blood
from the upper and lower regions of the body respectively and supplies this
de-oxygenated blood to the right atrium of the heart.
Flow of blood in the human heart
·
The
right atrium then contracts and passes the de-oxygenated blood to the right
ventricle, through an auriculo-ventricular aperture.
·
Then
the right ventricle contracts and passes the de-oxygenated blood into the two
pulmonary arteries, which pumps it to the lungs where the blood becomes
oxygenated. From the lungs, the pulmonary veins transport the oxygenated blood
to the left atrium of the heart.
·
Then
the left atrium contracts and through the auriculo-ventricular aperture, the
oxygenated blood enters the left ventricle.
·
The
blood passes to aorta from the left ventricle. The aorta gives rise to many
arteries that distribute the oxygenated blood to all the regions of the body.
Therefore,
the blood goes twice through the heart. This is known as double circulation
10.
Write any two points of difference between respiration in plants and animals?
(2 marks)
Ans: Respiration in plants.
Ans: Respiration in plants.
a)
In
plants separate respiratory organs are absent
b)
The
rate of respiration is slow.
c)
They
lack respiratory surface
Respiration
in animals
a)
In
animals respiratory organs are generally present
b)
The
rate of respiration is fast.
c)
Respiratory
surface is generally present.
11.
What criteria do we use to decide whether something is alive? (3 marks)
Ans: The main criteria to check for life, is the sign of breathing and respiration. If there is no sign of breathing or respirations then the given organism is not alive.
Ans: The main criteria to check for life, is the sign of breathing and respiration. If there is no sign of breathing or respirations then the given organism is not alive.
12.
What are the differences between autotrophic nutrition and heterotrophic
nutrition? (3 marks)
Ans:
Ans:
Autotrophic nutrition
|
Heterotrophic nutrition
|
Food is synthesized from simple inorganic raw materials such as CO 2 and
water.
|
Food is obtained directly or indirectly from autotrophs. This food is
broken down with the help of enzymes.
|
Presence of green pigment (chlorophyll) is necessary.
|
No pigment is required in this type of nutrition.
|
Food is generally prepared during day time.
|
Food can be prepared at all times.
|
All green plants and some bacteria have this type of nutrition.
|
All animals and fungi have this type of nutrition.
|
13.
Where do plants get each of the raw materials required for photosynthesis? (3
marks)
Ans:
Ans:
the
raw materials for photosynthesis
|
|
Water
|
Ground water
|
Sunlight
|
sun
|
CO2
|
Atmosphere
|
14.
What are the different ways in which glucose is oxidized to provide energy in
various organism? (3 marks)
Ans: At first glucose (6 carbon molecules) is broken in the cytoplasm of cells of all organisms. This process yields a three carbon molecule compound called pyruvate.
Ans: At first glucose (6 carbon molecules) is broken in the cytoplasm of cells of all organisms. This process yields a three carbon molecule compound called pyruvate.
Further break down of
pyruvate takes place in different manners in different organisms.
1. Anaerobic
Respiration
This process takes
place in absence of oxygen, e.g. in yeast during fermentation. In this case
pyruvate is converted into ethanol and carbon dioxide.
2. Aerobic
Respiration
In aerobic respiration,
breakdown of pyruvate takes place in presence of oxygen to give rise 3
molecules of carbon dioxide and water. The release of energy in aerobic
respiration is much more than anaerobic respiration.
3. Lack of
Oxygen
Sometimes, when there
is lack of oxygen, especially during vigorous activity, in our muscles,
pyruvate is converted into lactic acid (3 carbon molecule compounds). Formation
of lactic acid in muscles causes cramp.
15. (i) Draw a labelled diagram of the human respiratory system. (5
marks)
(ii) How oxygen and
carbon dioxide exchanged in our body during respiration?
(iii) Explain, how the air we breathe in gets cleaned while passing through the nasal passage.
(iii) Explain, how the air we breathe in gets cleaned while passing through the nasal passage.
Ans: (1) respiratory
system
(ii) When
the air enters into the lungs through nostrils, trachea and bronchi it enters
into the bronchioles, from bronchioles it moves into thin walled alveolar sacs
or alveoli. Alveoli are rich in blood capillaries, at this place oxygen from
air diffuses into the blood and reaches to all the cells and tissues of body
this oxygen now diffuses into the cell and is utilized for the oxidation of
food and production of energy in mitochondria as a result of this carbon dioxide
is produced in cells, due to this increased concentration of CO2, it
diffuses into the blood and is brought back to alveoli and expelled out of the
lungs through trachea and nostrils.
(iii) Nasal passage: This passage is
separated from oral cavity by means of a hard and bony palate. It is lined by
ciliated columnar epithelial cells that are rich in mucus; it brings about
warming, moistening and sterilization of air. It contains hair and mucus which
entrap the dust particles.