Open and Closed Circulatory System

Q. Give reasons:​
(iii) The entrance of the trachea is guarded by epiglottis.​ ​

Q. Select the incorrect statement regarding the vascular system of a cockroach:

1. Heart is located along the mid-dorsal line of abdomen and thorax.
2. They have well developed blood vessels
3. Haemolymph is colorless
4. Blood enters ostia via sinuses

Q.

How many chambers does a cockroach heart have?

Q. The percentage of haemoglobin saturated with oxygen will increase if the

1. Arterial pH is decreased
2. Temperature is increased
3. $C{O}_2$ concentration is increased
4. Arterial $p{O}_2$ is increased

Q.

Write the features tha distinguish between the two.

(i) Plasma and serum

(ii) Open and closed circulatory system

(iii) sino-atrial node and atrio-ventricular node

Q. Oxygen transported in dissolved form in blood is

1. $8mlof{O}_2/100\text{ml blood}$
2. $\text{2 ml}{O}_2/100\text{ml blood}$
3. $\text{3 ml}{O}_2/100\text{ml blood}$
4. $\text{5 ml}{O}_2/100\text{ml blood}$

Q. Which of the following statements is incorrect about transport of gases?

1. About 97 percent of $O_2$ is transported by RBCs in the blood
2. 3 percent of $O_2$ is carried in dissolved state in the plasma
3. 20-25 percent of $C{O}_2$ is transported by RBCs
4. 70 percent carbon dioxide is carried in dissolved state in plasma

Q. The following diagram shows blood vascular system of cockroach with certain labelled parts a, b and c. Which of the following statements is /are incorrect regarding this system?


a. The blood vascular system of cockroach is of open type with well-developed blood vessels which open into space (haemocoel).
b. The haemolymph is composed of colourless plasma and haemocytes.
c. The labelled part ‘a’ represents anterior aorta emerging from first chamber of heart bearing ostia on either side.

1. a only
2. All of the above statements are correct
3. b and c
4. a and d

Q. The heart of the cockroach has chambers.

1. 8
2. 13
3. 15
4. 11

Q. The cockroach has a/an circulatory system and blood flows through generalised body coelom called .

1. closed
2. haemocoel
3. paracoel
4. open

Q. Select the incorrect statement regarding the vascular system of a cockroach:

1. Heart is located along the mid-dorsal line of abdomen and thorax.
2. They have well developed blood vessels
3. Haemolymph is colorless
4. Blood enters ostia via sinuses

Q. Which dental formula represent a heterodont in placental draught and tough animals?

1. $l\frac{3}{3},C\frac{1}{1},PM\frac{4}{4},M\frac{2}{3}$
2. $l\frac{3}{3},C\frac{1}{1},PM\frac{3}{2},M\frac{1}{1}$
3. $l\frac{2}{1},C\frac{0}{0},PM\frac{3}{2},M\frac{3}{3}$
4. $l\frac{3}{3},C\frac{1}{1},PM\frac{4}{4},M\frac{3}{3}$

Q. The cockroach has a/an circulatory system and blood flows through generalised body coelom called .

1. closed
2. haemocoel
3. paracoel
4. open

Q. Which of the following statements is incorrect about transport of gases?

1. About 97 percent of $O_2$ is transported by RBCs in the blood
2. 3 percent of $O_2$ is carried in dissolved state in the plasma
3. 20-25 percent of $C{O}_2$ is transported by RBCs
4. 70 percent carbon dioxide is carried in dissolved state in plasma

Q. Select the incorrect statement regarding the vascular system of a cockroach:

1. Heart is located along the mid-dorsal line of abdomen and thorax.
2. They have well developed blood vessels
3. Haemolymph is colorless
4. Blood enters ostia via sinuses