55. The ratio of lengths to radii of two rods of same material is 1 : 2 and 2 : 3. If temperature difference between two ends of the rod is same, then what will be the ratio of heat flow?
(1) 3 : 2
(2) 4 : 3
(3) 1 : 3
(4) 8 : 9
Answer: (2) 4 : 3
56. In the network of resistances shown below, Current through the battery will be _______.
(1) 1.5 A
(2) 3.5 A
(3) 4.0 A
(4) 1.0 A
Answer: (1) 1.5 A
57. Citrus canker is caused by which type of pathogen?
(1) Bacteria
(2) Fungi
(3) Virus
(4) Nematode
Answer: (1) Bacteria
58. The categories of sclereids are _______.
a. Macrosclereids
b. Osteosclereids
c. Tracheids
d. Asterosclereids
Which of the statements given above is/are correct?
(1) Only a
(2) Only a and b
(3) a, b and d
(4) a, b and c
Answer: (3) a, b and d
Explanation: Tracheids are not sclereids.
59. Stomata will open if there is accumulation of the following element in the guard cells _______.
(1) Magnesium
(2) Potassium
(3) Iron
(4) Zinc
Answer: (2) Potassium
Explanation: K⁺ influx causes water entry → turgor pressure → stomata open.
60. Which of the following statements are correct regarding Spirogyra algae?
a. It is commonly called as Pond scum.
b. It grows in Marine water.
c. Its cell consist spiral shaped chloroplast.
d. It belongs in family Zygnemataceae.
(1) a, b and c
(2) b, c and d
(3) a, c and d
(4) a, b and d
Answer: (3) a, c and d
Explanation: Spirogyra is freshwater algae (not marine).
Q. 33
The Bengal Florican is neither a reptile nor an amphibian.
The leatherback sea turtle’s IUCN status is vulnerable.
The gharial and four-toed river terrapin are both critically endangered.
So no option is correct.
Yes.