2nd Year Biology Full Book Paper

Q1. Multiple choice questions (Attempt all · 17 × 1 = 17)

1. Which structure does not change its length during contraction?
   1. A band
   2. I band
   3. H zone
   4. Sarcomere
2. Steroid hormones are secreted by
   1. the adrenal cortex
   2. the gonads
   3. the thyroid
   4. both A and B
3. The two types of homology discussed in this section are:
   1. Genetic and metabolic homology
   2. Sequence and structure homology
   3. Plant and animal homology
   4. Behavioral and ecological homology
4. Which human activity leads to enhanced greenhouse effect?
   1. Transportation and burning fossil fuels
   2. Photosynthesis in plants
   3. Recycling of waste
   4. Planting trees
5. Which of the following is the respiratory surface in human respiratory system?
   1. larynx
   2. trachea
   3. bronchi
   4. alveoli
6. If the number of values is even, median is:
   1. The middle value
   2. Average of two middle values
   3. First value
   4. Last value
7. Which structure prevents food from entering the trachea during swallowing?
   1. Epiglottis
   2. Soft palate
   3. Tongue
   4. Uvula
8. What percent of nephron enters medulla?
   1. nephron loop
   2. proximal convoluted tubule
   3. distal convoluted tubule
   4. papillary duct
9. The heart is stopped during open heart surgery to:
   1. Reduce blood sugar
   2. Keep lungs functioning
   3. Remove cholesterol
   4. Allow repair of heart muscle
10. Biotechnology can be defined as the use of:
    1. Metals
    2. Microorganisms
    3. Animals
    4. Air
11. Which enzyme in sweat helps to break down bacterial cell walls?
    1. Amylase
    2. Lysozyme
    3. Pepsin
    4. Lipase
12. Birds and mammals are classified as:
    1. Poikilotherms
    2. Homeotherms
    3. Ectotherms
    4. Amphibians
13. Which scientific field studies the complete set of DNA of an organism, including all of its genes?
    1. Proteomics
    2. Transcriptomics
    3. Genomics
    4. Metabolomics
14. Which type of antibiotic inhibits bacterial cell wall synthesis?
    1. Tetracyclines
    2. Penicillins
    3. Sulfonamides
    4. Fluoroquinolones
15. In the reflex arc, effectors are usually:
    1. Dendrites
    2. Sensory receptors
    3. Muscles or glands
    4. Axons
16. Muscle contraction is initiated by:
    1. Hormone impulse
    2. Nerve impulse
    3. Heat stimulus
    4. Blood pressure
17. Hyperthyroidism may cause:
    1. Graves’ disease
    2. Diabetes mellitus
    3. Goiter
    4. Dwarfism