Life Processes Test

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Life Processes Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

Wilting of a plant results from excessive:

A
Respiration

B
Photosynthesis

C
Absorption

D
Transpiration
Solution
- Wilting mainly occurs when the amount of water loss is more than the water absorbed from the soil.
- Plants are constantly losing water through small openings in their leaves called stomata in a process known as transpiration. Transpiration is vital for photosynthesis and helps transport nutrients from the roots to the rest of the plant.
- The rate of transpiration depends on a number of factors, like carbon dioxide concentration, temperature, light, humidity etc.
- Hot and dry weather increases the rate of transpiration, resulting in a loss of more water than the plant can absorb, throwing off the water balance within the plant.
Hence, the correct option is D.
Question 2
1 / -0

In normal blood pressure of 120/80 mm Hg, the numerator presents

A
Pulse pressure

B
Cardiac index

C
Systolic pressure

D
Diastolic pressure

Solution

A healthy blood pressure reading should be lower than 120/80 mm Hg. Normal blood pressure is less than 120 mm Hg systolic and 80 mm Hg diastolic, and may vary from 90/60mm Hg to 120/80mm Hg in a healthy young woman. A blood pressure of 140/90 mmHg or higher indicates high blood pressure.
So, the correct option is 'Systolic pressure'.
Question 3
1 / -0

The value of diastolic blood pressure is:

A
120 mm Hg

B
80 mm Hg

C
120/80 mg Hg

D
40 mg Hg

Solution

Hypertension is the term for blood pressure that is higher than normal (120/80). In this measurement, 120 mm Hg (millimeters of mercury pressure) is the systolic, or pumping pressure and 80 mm Hg is the diastolic, or resting, pressure.
So, the correct answer is option B.
Question 4
1 / -0

The water moving upward forms a column, which is maintained up to a certain height due to

A
Osmosis

B
Transpiration pull

C
Translocational pool

D
Diffusion

Solution

The water moving upward forms a column, which is maintained up to a certain height due to transpiration pull. It is the pulling force responsible for lifting the water column. As water is lost in form of water vapor to the atmosphere from the mesophyll cells by transpiration, a negative hydrostatic pressure is created in the mesophyll cells which in turn draw water from veins of the leaves.
The negative tension is then gradually transmitted downwards via xylem tissues of the leaf, stem and finally to the roots. As a result, there is a continuous upward movement of the water column in the plant.
So, the correct answer is option B.
Question 5
1 / -0

Which of the following is not a function of transpiration?

A
Excretion of minerals

B
Cooling of leaves

C
Uptake of water

D
Uptake of minerals

Solution

The water, warmed by the sun, turns into vapor (evaporates), and passes out through thousands of tiny pores (stomata) mostly on the underside of the leaf surface. This process is called transpiration. Transpiration has the main functions of cooling the plant and pumping water and minerals to the leaves for photosynthesis.
Thus, the correct answer is option A.
Question 6
1 / -0

Lymph drains excess fluid from extracellular space back into

A
Blood

B
Lymph node

C
Lymphatic channel

D
Lymph gland

Solution

Lymph is a colourless fluid and connective tissue. It carries an excess of the extracellular fluid back to the venous system or it absorbs the excess fluid from the tissue and to return it to the blood. Lymphatic capillaries join and form lymphatic vessels further it forms lymphatic ducts. It is of two types: thoracic duct and right lymphatic duct. A small bean- shaped lymphoid organ surrounded by fibrous connective tissue carries fluid, nutrients & waste material between the body are lymph nodes or lymph glands.
Thus, the correct answer is A.
Question 7
1 / -0

For plants, transpiration is:

A
Not very important

B
Important

C
A necessary evil

D
An extra task

Solution

Transpiration is the loss of excess water in the form of water vapour through stomata, present on the aerial parts of the plants like leaves, stems, etc. Transpiration keeps the plants cool. Also, without transpiration, water and minerals will not rise from roots to aerial parts of plants and trees.
At the same time, it is essentially a wasteful process for the plants. Most of the water absorbed by a plant goes waste into the atmosphere through transpiration.
Thus, transpiration has been called a necessary evil for plants.
Question 8
1 / -0

Blood goes through the heart twice during each cycle is called as

A
Double circulation

B
Single circulation

C
Triple circulation

D
Quadruple circulation

Solution

Double circulationI is a type of circulatory system, where the heart pumps the blood twice to perform its function. The first pumping sends the blood to be circulated through the lungs, and the second pumping circulates the blood throughout the body. The right side of the heart accepts blood that has been circulated throughout the body and pumps it at a relatively low pressure to the lungs. In the lungs, the blood is replenished with oxygen. Once the blood has been completely circulated through the lungs, it returns to the heart. Arriving at the much larger left side of the heart, the blood is then pumped out to the entire body.
So, the correct answer is option A.
Question 9
1 / -0

Which side of the heart pumps only deoxygenated blood?

A
Right

B
Left

C
Both right and left

D
None of the above

Solution

The right atrium receives deoxygenated blood from the superior vena cava, which drains blood from the veins of the upper organs and arms. The right atrium also receives blood from the inferior vena cava, which drains blood from the veins of the lower organs and legs. This deoxygenated blood then passes to the right ventricle through the right atrioventricular valve (tricuspid valve).
Question 10
1 / -0

What are the characteristics of heterotrophic nutrition?

A
Heterotrophic organisms have chlorophyll.

B
Heterotrophic organisms are able to build up their own organic food from raw materials.

C
Heterotrophic organisms cannot make their own food.

D
All of the above

Solution

Heterotrophic organisms depend on autotrophs (plants) for their food supply. They cannot make their own food and hence they obtain food directly from plants or from plant-eating animals.
So, the correct answer is option C.

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Life Processes Test - 55

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Life Processes Test - 55

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SHARING IS CARING

Question 1

Respiration

Photosynthesis

Absorption

Transpiration

Solution

Question 2

Pulse pressure

Cardiac index

Systolic pressure

Diastolic pressure

Solution

Question 3

120 mm Hg

80 mm Hg

120/80 mg Hg

40 mg Hg

Solution

Question 4

Osmosis

Transpiration pull

Translocational pool

Diffusion

Solution

Question 5

Excretion of minerals

Cooling of leaves

Uptake of water

Uptake of minerals

Solution

Question 6

Blood

Lymph node

Lymphatic channel

Lymph gland

Solution

Question 7

Not very important

Important

A necessary evil

An extra task

Solution

Question 8

Double circulation

Single circulation

Triple circulation

Quadruple circulation

Solution

Question 9

Right

Left

Both right and left

None of the above

Solution

Question 10

Heterotrophic organisms have chlorophyll.

Heterotrophic organisms are able to build up their own organic food from raw materials.

Heterotrophic organisms cannot make their own food.

All of the above

Solution

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