Blood Vessels

Q. Choose the correct order in which the blood flows into each of these blood vessels from the heart and back.

1. Artery→ Arterioles→ Veins→ Venules→ Capillaries
2. Artery→ Arterioles→ Capillaries→ Venules→ Veins
3. Arterioles→ Artery→ Venules→ Veins→ Capillaries
4. Arterioles→ Artery→ Capillaries→ Veins→ Venules

Q.

What is Vasoconstriction

And vasodilation?

Q.

Assertion (A): Arteries are thick-walled and elastic.

Reason (R): Arteries carry oxygenated blood.

1. Both A and R are false.

2. Both A and R are true, and R is the correct explanation for A.

3. Both A and R are correct, but R is not the explanation for A.

4. A is true, and R is false.

Q.

Capillaries have very thick walls.

1. False

2. True

Q. Blood in arteries flow under high pressure. Therefore, they have and elastic walls.

1. thick
2. narrow
3. wide
4. short
5. thin

Q. Which vessel is responsible for the transport of water in plants?

1. Stomata
2. Chloroplast
3. Xylem
4. Phloem

Q. Red blood cells are ________________ while nerve cells are ________________.

1. spherical, branched
2. branched, spindle shaped
3. spindle shaped, spherical
4. elongated, branched

Q. Name the following:
(iii)Amoeboid cells in humans.

Q.

Which of the following is not true about veins?

1. Transport blood at low speed and low pressure

2. They have no valves

3. The veins carry blood to the heart

4. They have minute pores on the walls

Q. Why do veins have valves?

1. To trap pathogens
2. To provide substrate from clot formation.
3. To prevent backflow of blood.
4. To increase the blood pressure.

Q.

Xylem transports -------- and ------ from soil

Q. Study the diagram given below and then answer the questions that follow: (c) Where is this tissue likely to be found in the plant?​

Q.

Arteries are the sites for exchange of gases between blood and alveoli.

1. True

2. False

Q. Mention if the following statements are true (T) or false (F)
(ii) Veins of leaves have both xylem and phloem.

Q. Identify the correct match.

I: Arteries – Oxygen-rich blood
II: Arteries – Carbon dioxide-rich blood
III: Veins – Oxygen-rich blood
IV: Veins – Carbon dioxide-rich blood

1. II and III
2. I and IV
3. I and III
4. II and IV

Q.

Name the mechanism of transport of food by phloem tissue?

Q. Mention if the following statements are true (T) or false (F)
(i) Phloem cells carry manufactured food from leaves to other parts.

Q.

Question 30
Why are lysosomes known as ‘suicide-bags’ of a cell?

Q. Give the technical terms for the following:
(iv) The two types of tissues which provide the upward movement of water and dissolved materials from the roots to other parts of the plant.

Q.

Identify the correct match

I: Coronary artery – Oxygen-rich blood

II: Pulmonary vein – Carbon dioxide-rich blood

III: Pulmonary artery – Oxygen-rich blood

IV: Hepatic vein – Carbon dioxide-rich blood

1. II and IV

2. I and IV

3. I and III

4. II and III

Q.

Xylem: Water:: Phloem:__________________________

Q.

---- are forms of complex tissue.

Q.

Which of the following are examples of involuntary muscles?

1. Smooth muscles

2. Cardiac muscles

3. Skeletal muscles

4. All of these

Q.

Veins do not require thick walls.

1. True

2. False

Q. The following diagram refers to an apparatus which is used to demonstrate a physiological process:​
(c) What is the purpose of keeping boiled peas soaked in a disinfectant in test tube Y?

Q.

Arteries carry blood from the different body parts back to the heart.

1. septa

2. valves

Q.

Valves prevent backflow of blood inside the heart during contraction.

1. True

2. False

Q.

The artery carries blood in high pressure.

1. True

2. False

Q. Choose the odd one out in each of the following groups of four items each:

(d) Trachea, ciliated epithelium, mucus, diffusion.

Q. State whether the following statements are true(T) or false(F):

(i) Strenuous physical exercise may cause fatigue due to accumulation of ${CO}_2$ in the blood. T/F