Mock Test-5 (Paper-1) (Question 51-100)

Total Questions: 50

41. The oxygen rich blood from lungs comes to the heart in

Correct Answer: (a) Left atrium
Solution:The Oxygen rich blood from lungs comes to the heart in left atrium, the left chamber of the heart.

42. At which region of the electromagnetic spectrum do the plants photosynthesis?

Correct Answer: (a) Red and Blue
Solution:In the visible spectrum of light the most of the light energy which is absorbed by green plants for carrying out photosynthesis, are from red and blue regions. Green light is mostly reflected back.

43. Which of the following plant hormone is mainly responsible for fruit ripening?

Correct Answer: (c) Ethylene
Solution:Ethylene is the chemical compound which works as a phytohormone causing fruit-ripening. Cytokinin is responsible for cell division, abscisic acid provides drought resistance.

44. Vaseline was applied to both surfaces of the leaves of a plant. Which of the following process/processes would be affected?

1. Photosynthesis
2. Respiration
3. Transpiration

Select the correct answer using the codes given below:

Correct Answer: (d) 1, 2 and 3
Solution:When vaseline is applied to both surfaces of the leaf of a plant, all the three processes will be affected. Stomata of both surfaces will get closed. As a result there will be no exchange of gases like CO₂, O₂ and water vapour. This will affect all the three processes.

45. When touched, the leaflets of Touch-me-not plant are closed. Closing of leaflets starts from the point of contact to the leaflets away. The leaflets are closed due to:

Correct Answer: (a) change in turgor pressure
Solution:When touch me not plant are disturbed by touching or another stimuli, it stimulates the region of stems to release certain chemicals with potassium ions, that forces the water to move out of cell vacuoles, due to diffusion of water out of the cells, it causes differential turgidity between different region of cells, which causes closing of leaflets.

46. In human the thickest skin is present in

Correct Answer: (b) sole
Solution:The thickest skin is present in the sole of the foot being around 4mm thick. The heel portion of the foot being the thickest portion. The skin under the eye and the area around the eyelids is around 0.5mm thick and it is the thinnest skin in the body.

47. Consider the following statements:

Assertion (A): All the proteins in our food are digested in small intestine only.

Reason (R): The protein-digesting enzymes from pancreas are released into small intestine.

Correct Answer: (d) A is false, but R is true.
Solution:Assertion is false because protein digestion occurs in stomach and small intestine. But reason is true because the proteolytic enzyme from pancreas secretion immediately enters to small intestine from the stomach.

48. Which of the following statements correctly describe the properties of hormones?

1. They are steroids, proteins, peptides or amino acids derivatives.
2. They are not produced by body organs and are mostly taken as supplements.
3. They do not influence the working of those organs which have secreted them.
4. They act as co-enzymes and help enzymes to perform their function.

Select the correct answer using the code given below:

Correct Answer: (a) 1 and 4
Solution:The hormones are secreted by endocrine glands of body. They can behave as coenzymes, e.g., thiamine pyrophosphate can help in the transfer of aldehyde group. Enzymes can be protein or steroid in composition.

49. If pepsin is lacking in gastric juice, then the event in the stomach will be affected:

Correct Answer: (b) Proteins break down into peptides
Solution:Pepsin converts proteins into proteoses & peptones (peptides). Rennin helps in the digestion of milk proteins in infants. Later, pancreatic juices (trypsin chymotrypsin & carboxypeptidase) digest proteins, peptones & proteoses into dipeptides.

50. Which one of the following parts of body does NOT take part in the process of breathing?

Correct Answer: (b) Bowman's capsule
Solution:Fluid and small solutes are forced under pressure to flow from the glomerulus into the capsular space of the glomerular capsule. The Bowman's capsule is the filtration unit of the glomerulus and has tiny slits in which filtrate may pass through into the nephron.