58. Which of the following is the human haploid chromosome number?
A. 10
B. 23
C. 46
D. 92
59. Daughter chromosomes start to move towards the opposite poles of a dividing cell during
A. prophase
B. metaphase
C. anaphase
D. telophase
60. Organisms that comprise the greatest mass of living substance (biomass) in the terrestrial food chain are
A. decomposers (e.g., bacteria)
B. producers (e.g. grasses)
C. primary consumers (e.g., mice)
D. tertiary consumers (e.g., hawk)
61. The constant related to the gravitational force has a unit in the SI system of units of
A. [tex]$m sec ^{-2}$[/tex]
B. [tex]$kg m sec { }^{-1}$[/tex]
C. [tex]$N m ^2 kg^2$[/tex]
D. [tex]$J m sec ^{-1}$[/tex]
62. The physical quantity related to the height of liquid is
A. pressure
B. mass
C. weight
D. density
63. A body of volume [tex]$1 m^3$[/tex] is wholly immersed in a liquid of density [tex]$13600 kg / m ^3$[/tex] at sea level. The loss in weight of the body in the liquid is equal to
A. 1360 N
B. 13.6 N
C. [tex]$\left(\frac{1}{13600}\right) N$[/tex]
D. 136000 N
Answer (2)
The answers to the questions are: 58 - B (23), 59 - C (anaphase), 60 - B (producers), 61 - C ( N m 2 k g − 2 ), 62 - A (pressure), 63 - D (136000 N). Each answer addresses key concepts in biology and physics. Understanding these principles is important for studies in life sciences and mechanics.
;
The human haploid chromosome number is 23.
Daughter chromosomes move to opposite poles during anaphase.
Producers have the greatest biomass in terrestrial food chains.
The gravitational constant's SI unit is N m 2 k g − 2 .
Pressure is related to the height of a liquid.
The loss in weight of the body in liquid is approximately 136000 N .
Therefore, the answers are: 58. B 59. C 60. B 61. C 62. A 63. D
Explanation
Introduction We will address each multiple-choice question individually, providing the correct answer and a brief explanation.
Question 58 - Chromosome Number Question 58: The human haploid chromosome number is the number of chromosomes in a sperm or egg cell. Humans have 46 chromosomes in their somatic cells, which are diploid (2n). Haploid cells (n) have half the number of chromosomes. Therefore, the haploid number is 46 / 2 = 23. The answer is B.
Question 59 - Cell Division Stage Question 59: During cell division, daughter chromosomes move towards opposite poles during anaphase. The answer is C.
Question 60 - Biomass in Food Chain Question 60: In terrestrial food chains, producers (e.g., grasses) comprise the greatest mass of living substance (biomass). The answer is B.
Question 61 - Gravitational Constant Units Question 61: The gravitational force is given by F = G r 2 m 1 m 2 , where F is force (N), m 1 and m 2 are masses (kg), r is distance (m), and G is the gravitational constant. Rearranging for G , we have G = m 1 m 2 F r 2 . The units of G are k g 2 N m 2 . The answer is C.
Question 62 - Liquid Height and Pressure Question 62: The height of a liquid column is directly related to the pressure exerted by the liquid. The answer is A.
Question 63 - Buoyant Force Calculation Question 63: The loss in weight of the body in liquid is equal to the buoyant force, which is given by Archimedes' principle: F B = V ρ g , where V is the volume of the body, ρ is the density of the liquid, and g is the acceleration due to gravity ( g ≈ 9.8 m / s 2 ). Given V = 1 m 3 and ρ = 13600 k g / m 3 , we have: F B = 1 m 3 × 13600 k g / m 3 × 9.8 m / s 2 = 133280 N The closest option to this calculated buoyant force is D, 136000 N.
Final Answers Final Answers:
B
C
B
C
A
D
Examples
Understanding chromosome numbers is crucial in genetics for predicting inheritance patterns and understanding genetic disorders. Knowing the stages of cell division helps in understanding growth and repair mechanisms in organisms. Biomass studies are important in ecology for understanding energy flow in ecosystems. The gravitational constant is fundamental in physics for calculating gravitational forces between objects. Liquid pressure is essential in fluid mechanics for designing hydraulic systems. Buoyant force calculations are used in naval architecture for designing ships.
