Life Processes Test

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Life Processes Test - 71

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Question 1
1 / -0

Chambers in human heart

A
1 auricle, 1 ventricle

B
2 auricles, 1 ventricle

C
1 auricle, 3 ventricles

D
2 auricles, 2 ventricles
Solution
- There are four chambers in the human heart.
- There are two anterior chambers, the auricles which are also called the atrium, and two posterior chambers, the ventricles.
- The auricles are the “receiving chambers” as they receive blood from different body parts.
- The ventricles, on the other hand, are the “distributing chambers”.
- The ventricles are larger chambers and also have thicker muscular walls when compared to the auricles
So, the correct answer is '2 auricles, 2 ventricles'
Question 2
1 / -0

The stomata present in the leaves help in _______.

A
Intake of CO$$_2$$ during photosynthesis

B
Release of O$$_2$$ during photosynthesis

C
Release of water vapour during transpiration

D
All of these

Solution

Stomata are minute openings found in the epidermis of leaves and stems. Stomata allow gases such as carbon dioxide, water vapour, and oxygen to diffuse into and out of the internal tissues of the plant.
Transpiration is the process by which plants lose excess water in the form of water vapour, through stomata. During photosynthesis, plants take in carbon dioxide from the air and release oxygen as a byproduct, through the stomata.
So, the correct answer is option D.
Question 3
1 / -0

Aerobic and anaerobic respirations differ from each other in all aspects except:

A
Presence of absence of oxygen.

B
Output of energy.

C
End products.

D
Breakdown of glucose in cytoplasm.

Solution

Aerobic respiration is the breakdown of glucose in the presence of oxygen and anaerobic respiration is the breakdown of energy in the absence of oxygen.
The energy released in aerobic respiration is higher as glucose is completely broken into CO₂ and H₂O whereas, in anaerobic respiration partial breakdown of glucose takes place and energy output is low.
Glycolysis, which converts glucose to pyruvic acid is the only common pathway that occurs in both aerobic and anaerobic respiration. It takes place in the cytoplasm.
So, the correct option is option D.
Question 4
1 / -0

Which part of the plant helps to absorb water and minerals from the soil?

A
Root hairs

B
Roots

C
Root cap

D
Tap root

Solution

The root has further extensions which increase the surface area for absorption. Theses extensions are called root hair, which are present in all types of roots.
So, the correct option is A.
Question 5
1 / -0

Find the correct order of blood circulation through heart.

A
Right atrium $$\rightarrow$$ Right ventricle $$\rightarrow$$ Lungs $$\rightarrow$$ Left atrium $$\rightarrow$$ Left ventricle $$\rightarrow$$ Body

B
Right ventricle $$\rightarrow$$ Right atrium $$\rightarrow$$ Lungs $$\rightarrow$$ Left atrium $$\rightarrow$$ Left ventricle $$\rightarrow$$ Body

C
Left atrium $$\rightarrow$$ Left ventricle $$\rightarrow$$ Lungs $$\rightarrow$$ Right atrium $$\rightarrow$$ Right ventricle $$\rightarrow$$ Body

D
Left ventricle $$\rightarrow$$ Left atrium $$\rightarrow$$ Lungs $$\rightarrow$$ Right atrium $$\rightarrow$$ Right ventricle $$\rightarrow$$ Body

Solution

The deoxygenated blood enters the right atrium through the vena cava. This blood passes to the right ventricle which enters the pulmonary artery to supply the blood to the lungs. The oxygenated blood enters the left atrium through the pulmonary veins. This blood passes into the left ventricle which pumps the blood into the aorta. The aorta supplies the blood to the tissues of the body.
Thus, the correct answer is option A.
Question 6
1 / -0

Select the correct schematic representation of blood circulation in human from the following.

A

B

C

D

Solution

The deoxygenated blood is brought from the different parts of the body by the veins which enter the right atrium through the vena cava. This blood passes to the right ventricle which enters the pulmonary artery to carry the blood to the lungs. The blood is oxygenated and then brought back to the heart through the pulmonary vein. The oxygenated blood enters the left atrium through the pulmonary vein. This blood passes into the left ventricle which pumps the blood into the aorta. The aorta supplies the blood to the tissues of the body through arteries.
Thus, the correct answer is option B.
Question 7
1 / -0

In which part of the body blood gets purified (becomes oxygenated)?

A
Atrium

B
Lungs

C
Heart

D
Ventricle
Solution
- Deoxygenated (unpurified) blood comes into the right atrium of the heart through the superior and inferior vena cava which is then passed to the right ventricle and then to the lungs by the pulmonary artery.
- In the lungs, this blood gets oxygenated (purified) which then goes into the left atrial chamber of the heart from which blood is passed to the aorta and then circulated to the whole body.
So, the correct answer is 'B'.
Question 8
1 / -0

Pick the odd one out among the parts of the alimentary canal:

A
Pharynx

B
Mouth

C
Buccal cavity

D
Pancreas
Solution
- The pancreas helps in digestion by secreting pancreatic juice in the small intestine.
- However, the pancreas is a gland and is not a part of the alimentary canal.
- The alimentary canal is a muscular tube that extends from mouth to anus and includes the mouth, pharynx, esophagus, stomach, and intestines.
So, option D is the correct answer.
Question 9
1 / -0

Name the fluid medium present in the blood.

A
Plasma

B
Lymph

C
Urine

D
Synovial Fluid

Solution

The liquid part of the blood is called plasma. It is composed of water, salts, enzymes, antibodies and other proteins. It is straw coloured liquid portion of the blood. It holds the blood corpuscles and acts as a extracellular matrix for the blood cells.
So, the correct answer is option A.
Question 10
1 / -0

Photosynthesis occurs in the ________ of the plants.

A
Roots

B
Flowers

C
Leaves

D
Fruits

Solution

Photosynthesis is the process by which the light energy from the sun is captured by the chlorophyll pigments present on the leaves (mostly leaves, in few plants, stem also contributes in photosynthesis) and is used for the preparation of food. This process requires raw materials like carbon dioxide and water.
Thus, the correct answer is option C.