Tissues Test

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Tissues Test - 95

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Weekly Quiz Competition

Question 1
1 / -0

Vascular layers of plant body have

A
Protective tissue

B
Epithelial tissue

C
Meristematic tissue

D
None of the above

Solution

Vascular bundles of the plant consist of vascular cambium or cork cambium. Cork cambium is involved in making cork. Cork is a nonliving, water resistant tissue formed in many plants to prevent water loss. Cork cells are dead and have cell walls composed of a waxy substance "suberin" which is highly impermeable to gases and water. This substance prevents water loss from the stem. Cork also protects the plant from wear and tear. Hence, it is a protective type of tissue.
Therefore, option A is correct.
Question 2
1 / -0

Which one of the following helps in keeping the body warm?

A
Sweat glands

B
Adipose tissue

C
Skin

D
Hair

Solution

Fat-storing adipose tissue is found below the skin and between internal organs. The cells of this tissue are filled with fat globules and therefore, it acts as an insulator that keeps the body warm.
Hence the correct option is B.
Question 3
1 / -0

One of the factors required for the maturation of erythrocytes is

A
Vitamin D

B
Vitamin A

C
Vitamin B$$_{12}$$

D
Vitamin C

Solution

Vitamin B$$_{12}$$ and folic acid (vitamin B$$_9$$) (both are members of the B vitamin complex) are important for the final maturation of RBC. This is because they are both important for the synthesis of DNA and diminished quantity of DNA leads to failure of nuclear maturation and division. The RBCs also become larger than normal (megaloblasts) which are fragile and have a short lifespan (they can carry oxygen normally).
Thus, the correct answer is option C.
Question 4
1 / -0

Which of the following statements is incorrect?

A
Pesticides on entering the food chain accumulate in high amount in the bodies of higher predators which causes damage to the ecosystem.

B
Blood in arteries has more oxygen than blood in veins except for the pulmonary arteries and pulmonary veins.

C
When blood is spinned in a centrifuge to separate plasma from the blood cells (RBCs, WBCs platelets etc.), blood cells constitute the supernatant and plasma constitutes the pellet.

D
Poultry is India's most efficient converter of low fibre food stuff (which is unfit for human consumption) into highly nutritious protein food.

Solution

The process of separating the components of blood is called blood fractionation. It is done by the centrifugation method. After centrifugation, a clear solution of blood plasma is separated in the upper phase, a thin layer of leukocytes (white blood cells) in the middle and erythrocytes (red blood cells ) at the bottom of the centrifuge tube. This separation is based on the molecular weight of the components. The component of higher molecular weight settles down i.e., pellet and the component of lower molecular weight comes to the upper surface as supernatant. Thus the incorrect statement is C.
Question 5
1 / -0

A man was brought up at sea level while his brother spent all his life at an altitude of 10,000 feet. The latter will have

A
More active bone marrow

B
Lower blood pressure

C
Less subdermal fat

D
More active sweat glands

Solution

The amount of haemoglobin in the blood increases at high altitude. This is one of the best-known features of acclimatisation (acclimation) to high altitude. Increasing the amount of haemoglobin in the blood increases the amount of oxygen that can be carried. However, there is a downside; when there is too much haemoglobin, blood becomes sticky and viscous and it is harder for the heart to pump the blood around the body. This happens in chronic mountain sickness. So, to increase the haemoglobin concentration, the bone marrow will be more active to generate RBCs. High altitude does not cause low BP, less subdermal fat and active sweat glands.
Therefore, the correct answer is option A.
Question 6
1 / -0

Number of RBC increases if one lives at higher altitude because

A
There is less oxygen

B
More heat is required in body for producing body warmth.

C
There are no germs in mountain air.

D
There is more oxygen

Solution

RBC count increases in people living at high altitudes because the atmospheric pressure decreases and the levels of atmospheric oxygen also falls. Hence to carry more amount of oxygen to the cells, more number of red blood cells are required.
Therefore the correct option is A.
Question 7
1 / -0

One of the factors required for the maturation of erythrocytes is

A
Vitamin D

B
Vitamin A

C
Vitamin B$$_{12}$$

D
Vitamin C

Solution

Factors essential for the maturation of RBCs are vitamin B$$_{12}$$ (cobalamin) and vitamin B$$_9$$ (folic acid). Vitamin B$$_{12}$$ works in conjunction with folate in the formation and maturation of red blood cells.
Therefore, the correct answer is option C.
Question 8
1 / -0

A bone left in dilute HCl for about three days will______________

A
Crack into pieces

B
Become soft and elastic

C
Dissolve completely

D
Remain as it is

Solution

HCl is hydrochloric acid, strong acid. Bone is made of minerals, and the most prominent mineral is calcium. When a bone is dropped in the HCl medium, the calcium of bone slowly starts dissolve due to the action of the strong acid. HCl + Ca -> CaCl$$_2$$ + H$$_2$$. Afterward, the bone is depleted of calcium but it does not "melt" because there are other minerals that make up the bone such as potassium, vitamins, and collagen. Since calcium is the main mineral in the bone, the bone becomes brittle and more susceptible to breakage. Therefore, the correct answer is option B.
Question 9
1 / -0

An adult male is made up of ................ % of skeletal muscles.

A
42

B
27

C
40

D
None of these
Solution
- Skeletal muscle is a type of striated muscle tissue. It is under the voluntary control of the somatic nervous system.
- It is one of three major muscle types, the others being cardiac muscle and smooth muscle.
- An average adult male is made up of 42% of skeletal muscle and an average adult female is made up of 36% skeletal muscle.
- It also has striations, unlike smooth muscle.
- Hence the correct option is A.
Question 10
1 / -0

Read the passage and answer the following question.
Students carry out an experiment to explore the effect of different environments on blood flow using small, freshwater fish. Each fish is placed into a petri dish. A wet cotton ball is placed over its gills to allow for the diffusion of oxygen, which will keep the fish alive. The students then place the petri dish onto the stage of a light microscope so that the thinnest part of the tail is directly under the objective lens and blood can be seen flowing in blood vessels. While focusing on a capillary, students count the number of red blood cells flowing through the vessel at 5-second intervals. After monitoring the normal flow of blood for 30 seconds, the environment in the petri dish is altered in one of five different ways. Students observe and record the change in blood flow if any. After the experiment, each fish is returned to the fish tank.

Experiment 1 - Nothing is added to this petri dish.
Experiment 2 - Water at a temperature of $$\displaystyle { 5 }^{ \circ }C$$ is added.
Experiment 3 - Water at a temperature of $$\displaystyle { 30 }^{ \circ }C$$ is added.
Experiment 4 - Ethyl alcohol is added.
Experiment 5 - Nicotine extracted from cigarette tobacco is added.

Experiment Initial average rate of blood flow Final average rate of blood flow
1 9 9
2 8 4
3 9 13
4 8 5
5 9 12

Which of the following is the dependent variable in experiment 3?

A
The health of the individual fish

B
Temperature of the water

C
Nicotine

D
Alcohol

E
Rate of blood flow
Solution
- The dependent variable is the one which changes in response to changes in the experiment.
- As only the rate of the blood flow is changing, the option E is the correct answer.

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Experiment	Initial average rate of blood flow	Final average rate of blood flow
1	9	9
2	8	4
3	9	13
4	8	5
5	9	12

Tissues Test - 95

Result

Tissues Test - 95

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Rank

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SHARING IS CARING

Question 1

Protective tissue

Epithelial tissue

Meristematic tissue

None of the above

Solution

Question 2

Sweat glands

Adipose tissue

Skin

Hair

Solution

Question 3

Vitamin D

Vitamin A

Vitamin B$$_{12}$$

Vitamin C

Solution

Question 4

Pesticides on entering the food chain accumulate in high amount in the bodies of higher predators which causes damage to the ecosystem.

Blood in arteries has more oxygen than blood in veins except for the pulmonary arteries and pulmonary veins.

When blood is spinned in a centrifuge to separate plasma from the blood cells (RBCs, WBCs platelets etc.), blood cells constitute the supernatant and plasma constitutes the pellet.

Poultry is India's most efficient converter of low fibre food stuff (which is unfit for human consumption) into highly nutritious protein food.

Solution

Question 5

More active bone marrow

Lower blood pressure

Less subdermal fat

More active sweat glands

Solution

Question 6

There is less oxygen

More heat is required in body for producing body warmth.

There are no germs in mountain air.

There is more oxygen

Solution

Question 7

Vitamin D

Vitamin A

Vitamin B$$_{12}$$

Vitamin C

Solution

Question 8

Crack into pieces

Become soft and elastic

Dissolve completely

Remain as it is

Solution

Question 9

42

27

40

None of these

Solution

Question 10

The health of the individual fish

Temperature of the water

Nicotine

Alcohol

Rate of blood flow

Solution

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