31. Ostrich belongs to which of the following order?
[A] Struthioniformes
[B] Casuariformes
[C] Apterygiformes
[D] Procellariiformes
Show Answer
Correct Answer: A [Struthioniformes]
Notes:
Ostrich belongs to the Struthioniformes order. This group includes non-flying running Aves of about 2 meters in height.
32. Why is a dolphin is a mammal?
[A] because it breathes through lungs
[B] because has mammary glands
[C] because it does not lay eggs
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Dolphin is a mammal because it breathes through the lungs and has mammary glands. In addition, it does not lay eggs and gives birth to its own young. Dolphins belong to the Cetaceans class of mammalia.
33. On average, an adult brain weighs between how many kg?
[A] 2.0 kg – 2.5 kg
[B] 1.0 kg – 1.5 kg
[C] 1.5 kg – 2.5 kg
[D] 3.0 kg – 3.5 kg
Show Answer
Correct Answer: B [1.0 kg – 1.5 kg]
Notes:
On average, an adult brain weighs between 1.0kg – 1.5kg and it is mainly composed of neurons – the fundamental unit of the brain and nervous system.
34. What is the excretory unit in the human excretory system?
[A] Neuron
[B] Nephron
[C] Nephridia
[D] Nerve
Show Answer
Correct Answer: B [Nephron]
Notes:
The nephron is the excretory unit in the human excretory system. Each nephron has two parts – the glomerulus and the renal tubule.
35. Where does the stomach receive its blood supply?
[A] Superior mesenteric artery
[B] Inferior mesenteric artery
[C] Gastric artery
[D] Coeliac axis
Show Answer
Correct Answer: D [Coeliac axis]
Notes:
The stomach receives the majority of its blood supply from the Coeliac axis.
36. Which of the following are the main sources of biofertilizers?
[A] bacteria
[B] cyanobacteria
[C] fungi
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Bacteria, cyanobacteria and fungi are the main sources of biofertilizers. These trap atmospheric nitrogen and reduce it to ammonia and make it available to plants. They also convert insoluble phosphates into forms required by plants.
37. Bt toxin is produced by a bacterium called __.
[A] Bacillus thuringiensis
[B] Bacillus anthracis
[C] Bacillus thermophilus
[D] Bacillus subtilis
Show Answer
Correct Answer: A [Bacillus thuringiensis]
Notes:
Bt toxin is produced by a bacterium called Bacillus thuringiensis.
38. Which of the following are examples of hydrophilic molecules?
[A] sugar
[B] cellulose
[C] starch
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
A molecule whose interaction with water and other polar substances is more thermodynamically favorable than its interaction with oil or other hydrophobic solvents is called a hydrophilic molecule. Sugar, salt, starch, and cellulose are examples of hydrophilic molecules.
39. Jaws are absent in ____:
[A] Birds
[B] Fishes
[C] Reptiles
[D] Protochordata
Show Answer
Correct Answer: D [Protochordata]
Notes:
Jaws are absent in protochordata and cyclostomata (Agantho stoma). Protochordata refers to invertabrate subphylum of phylum chordata. It includes animals such as tunicates.
40. Solitary cymose inflorescence is observed in ____:
[A] Rose
[B] Tuberose
[C] Chinarose
[D] Gardenia
Show Answer
Correct Answer: D [Gardenia]
Notes:
Solitary cymose inflorescence refers to a determinate inflorescence composed of a single flower. Examples include poppy, gardenia (ornamental plant), tulip, etc. Flowers are said to be solitary when the plant bears only one, or when single flowers appear on the ends of lateral branches that are remote from one another.
