31. Chemical digestion of food occurs by biological catalysts __
[A] enzymes
[B] villi
[C] glycogen
[D] egestion
Show Answer
Correct Answer: A [enzymes]
Notes:
The chemical digestion of food that occurs by biological catalysts is called enzymes.
32. What is the precursor of steroid hormone?
[A] Protein
[B] Cholesterol
[C] Carbohydrate
[D] Lipid
Show Answer
Correct Answer: B [Cholesterol]
Notes:
Cholesterol serves as a precursor to steroid hormones. DHEA is a natural steroid hormone synthesized from cholesterol.
33. Tetanus is an acute infectious disease caused by the spores of which bacterium?
[A] Clostridium tetani
[B] Pasteurella pestis
[C] Bacillus anthracis
[D] Bordetella pertussis
Show Answer
Correct Answer: A [Clostridium tetani]
Notes:
Tetanus is an acute infectious disease caused by the spores of Clostridium tetani bacterium.
34. Who among the following invented Bt cotton?
[A] Ernst Berliner
[B] James Black
[C] Erwin Chargaff
[D] Rachel Carson
Show Answer
Correct Answer: A [Ernst Berliner]
Notes:
Ernst Berliner invented Bt cotton. Genetically modified by the insertion of one or more genes from a common soil bacterium, Bacillus thuringiensis, known as Bt cotton.
35. In winter, at the time of hibernation, Toads maintain breathing through ____:
[A] Lungs
[B] Skin
[C] Both by Skin and Lungs
[D] Buccal cavity
Show Answer
Correct Answer: B [Skin]
Notes:
During hibernation in winter, toads or frogs spend the time tucked away deep in the soil, in the mud underwater or hidden amidst foliage or rotting plants. Outside of times of hibernation, they usually take in oxygen via the air, employing their lungs. However, during hibernation, they receive their necessary oxygen through their permeable skin. This is referred to as cutaneous gas exchange.
36. _____ is the study of the microanatomy of cells, tissues and organs as seen through a microscope:
[A] Entomology
[B] Paleontology
[C] Histology
[D] Lchthyology
Show Answer
Correct Answer: C [Histology]
Notes:
Histology is the study of the micro anatomy of cells, tissues, and organs as seen through a microscope. It examines the correlation between structure and fun-ction.Histology is the micro-scopic counterpart to gross anatomy which looks at larger structures visible without a microscope.
37. Cuscuta is a ____:
[A] Complete stem parasite
[B] Partial root parasite
[C] Partial stem parasite
[D] Complete root parasite
Show Answer
Correct Answer: A [Complete stem parasite]
Notes:
Cuscuta (Dodder) is a genus of about 100-170 species of yellow, orange or red (rarely green) parasitic plants. Dodders are supremely adapted for a life of plunder and pillage. Reduced in form to scrambling and twining threads, they appear to be completely leafless, although closer inspection reveals tiny scale leaves pressed close to the stems. So, it is a stem parasite.
38. The connective tissue that connects a muscle to a bone is _____:
[A] Cartilage
[B] Ligament
[C] Interstitial fluid
[D] Tendon
Show Answer
Correct Answer: D [Tendon]
Notes:
A tendon or sinew is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension. Tendons are similar to ligaments; both are made of collagen. Ligaments join one bone to another bone, while tendons connect muscle to bone.
39. Tendons and ligaments are
____:
[A] Connective tissue
[B] Muscular tissue
[C] Epithelial tissue
[D] Skeletal tissue
Show Answer
Correct Answer: A [Connective tissue]
Notes:
A tendon is a fibrous connective tissue which attaches muscle to bone. A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.
40. Which type of plants have weak stems and take support on neighbouring structures to climb up?
[A] Climbers
[B] Herbs
[C] Trees
[D] Shrubs
Show Answer
Correct Answer: B [Herbs]
Notes:
There are some plants with weak stems that cannot stand upright and spread on the ground. These are called creepers, while those that take support on neighbouring structures and climb up are called climbers. Money plant, gourd plant, etc are examples of climbers.
