High School

**BIOLOGY FOR GRADE 11**

**Time Allowed:** 2 hours

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**Part I: True or False**

Write "true" if the statement is correct and "false" if the statement is incorrect.

1. Substrate specificity is the feature of enzymatic activity where an enzyme acts only on a particular substrate.
2. Sexual reproduction is more common among invertebrates than vertebrates.
3. Inherent behavior is acquired during the lifetime of an individual.
4. A geographical position system is a device used to collect biogeographical information on landscape mapping.
5. It is unethical to plant trees and it is a national responsibility.
6. Reduction is one of the ethical treatments of animals in experiments.
7. Smaller animals have a high SA/V ratio and lose a lower amount of heat.

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**Part II: Matching**

Match the statements in Column A with the appropriate descriptions in Column B.

**Column A:**

8. Primary structure
9. Secondary structure
10. Quaternary structure
11. Lock and key model
12. Induced fit model
13. Anabolic
14. Catabolic
15. Insulin
16. Glucagon
17. Negative feedback
18. Positive feedback

**Column B:**

A) Two or more polypeptide chains
B) α-Helix or β-pleated sheet
C) Linear sequence of amino acids
D) Not complementary to substrate
E) Complementary to substrate
F) Breaks down different products
G) Builds up new molecules or products
H) Lowers blood sugar level
I) Increases blood sugar level
J) The activation of one component causes the activation of another
K) The activation of one component results in the deactivation of another

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**Part III: Multiple Choice**

Choose the best answer from the given alternatives.

19. Which of the following animals have external fertilization?
A. Crocodile
B. Frog
C. Fly
D. Rat

20. Mating between several partners is called:
A. Monogamous
B. Digamous
C. Polygamous
D. None

21. Which of the following is a common characteristic of all vertebrates?
A. Have an exoskeleton
B. Have a segmented body
C. Have a complex and specialized organ system
D. They are cold-blooded

22. What does glucagon promote in the liver?
A. Hydrolysis of glucose
B. Hydrolysis of glycogen
C. Release of insulin
D. Glycogen production

23. Which of the following animals has an exoskeleton?
A. Insect
B. Fish
C. Birds
D. Mammals

24. Which of the following physiological methods of temperature regulation is used during cold times?
A. Bathing
B. Shivering
C. Sweating
D. Hibernation

25. Based on temperature regulation, which of the following animals is poikilothermic?

Answer :

Final answer:

The answers include various true/false statements related to biological concepts, matching terms with definitions, and multiple-choice questions covering reproduction and physiological processes. Key aspects like enzyme specificity, fertilization types, and body temperature regulation are discussed. This informs a comprehensive understanding of these biological principles.


Explanation:

True or False Statements

  1. True: Substrate specificity is indeed a feature of enzymatic activity where an enzyme acts only on a particular substrate.
  2. False: Sexual reproduction is generally more common among vertebrates than invertebrates.
  3. False: Inherent behavior refers to behaviors that are innate or genetically programmed, not acquired during an individual’s lifetime.
  4. True: The geographical position system helps in collecting biogeographic information on landscape mapping.
  5. False: Planting trees is generally considered ethical and beneficial for the environment; it’s a civic responsibility.
  6. True: Reduction is an ethical treatment in animal experiments, referring to minimizing the number of animals used.
  7. False: Smaller animals typically have a higher surface area to volume ratio, leading to greater heat loss.

Matching Statements

  1. 8. Primary structure - C) linear sequence of amino acid.
  2. 9. Secondary structure - B) a-Helix or ẚ-pleated sheet.
  3. 10. Quaternary structure - A) two or more polypeptide chains.
  4. 11. Lock and key model - E) complementary to substrate.
  5. 12. Induced fit model - D) not complementary to substrate.
  6. 13. Anabolic - G) build up new molecules or products.
  7. 14. Catabolic - F) breaks down different products.
  8. 15. Insulin - H) lower blood sugar level.
  9. 16. Glucagon - I) high blood sugar level.
  10. 17. Negative feedback - K) the activation of one component results in the deactivation of another.
  11. 18. Positive feedback - J) the activation of one component causes the activation of another.

Multiple Choice Questions

  1. 19. B) Frog - Frogs have external fertilization.
  2. 20. C) Polygamous - Mating between several partners is called polygamous.
  3. 21. C) Have complex and specialized organ system - This is a common characteristic of all vertebrates.
  4. 22. D) Hydrolysis of glycogen - Glucagon promotes the hydrolysis of glycogen in the liver.
  5. 23. A) Insect - Insects have an exoskeleton.
  6. 24. B) Shivering - Shivering is a physiological method of temperature regulation used during cold times.
  7. Poikilothermic animals are those that cannot regulate their body temperature, commonly reptiles.

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