1. The basis of stomatal opening is—
(A) Plasmolysis (B) Endosmosis (C) Exosmosis (D) Decrease in the cell sap concentration
See Answer:

2. The floating roots are not characteristic features of—
(A) Jussiaea (B) Viscum (C) Tinospora (D) Vanda
See Answer:

3. Agent orange is a/an—
(A) Hazardous chemical used in luminous paints (B) Biodegradable insecticide
(C) Weedicide containing dioxin (D) Enzyme necessary for seed germination
See Answer:

4. A leaf adapted to a warm, dry climate is—
(A) Small and thin (B) Small and thick (C) Large and thin (D) Large and thick
See Answer:

5. The carrying capacity of a population is determined by its—
(A) Birth rate (B) Limiting resource (C) Population growth rate (D) Death rate
See Answer:

6. The niche of a population is the—
(A) Place where it lives (B) Set of interactions it has with other population
(C) Geographic area it covers (D) Set of conditions and resources it uses
See Answer:

7. All eukaryotic genes contain two kinds of base sequences, which of these play role in protein synthesis ?
(A) Introns (B) Exons (C) Both (A) and (B) (D) None of the above
See Answer:

8. Unifoliate compound leaf is found in—
(A) Pisum (B) Citrus (C) Asparagus (D) None of the above
See Answer:

9. Gymnosperms lack fruit because—
(A) They lack ovary (B) They lack actual fertilization
(C) They lack pollination (D) They cannot afford the weight of fruit
See Answer:

10. Nepenthes captures insects to get—
(A) Soluble fat (B) Insoluble fat (C) Nitrogenous food (D) Carbohydrate
See Answer:

11. Which of the following is not a homopolysaccharide ?
(A) Dextran (B) Chitin (C) Glycogen (D) Gamma globulin
See Answer:

12. Which of the following plants is commonly known as ‘Douglas fir’ ?
(A) Pseudotsuga menziesii (B) Adina cordifolia (C) Bombax ceiba (D) Ailanthus grandis
See Answer:

13. If the sequence of the bases along one side of DNA molecule is AAGCT, then the complementary sequence of bases on the other side of the DNA molecule is—
(A) TTGCA (B) TTAGC (C) TTCAG (D) TTCGA
See Answer:

14. The sinoatrial node, which generates the electrical impulses that coordinate heart-muscle contractions, is located in the—
(A) Left atrium (B) Right atrium (C) Left ventricle (D) Posterior vena cava
See Answer:

15. Which of the following vegetarian meals will supply all the essential amino acids ?
(A) Spinach and beans (B) Corn and rice (C) Beans and wheat flour (D) Peas and beans
See Answer:

16. Most digestion and all absorption of food take place in—
(A) Stomach (B) Small intestine (C) Caecum (D) Large intestine
See Answer:

17. Intestinal gas is the product of—
(A) Irritated intestinal cells (B) Intestinal bacteria
(C) Undigested food (D) Vitamin fermentation
See Answer:

18. Exons are those segments of the gene that encode—
(A) Fatty acids (B) Sugars (C) Proteins (D) All the above
See Answer:

19. If the DNA of an organism has 20% thymine, what would be the total percentage of guanine in it ?
(A) 30% (B) 20% (C) 40% (D) 60%
See Answer:

20. A notochord is found at the embryonic stage in—
(A) All land animals (B) All chordates (C) Some chordates (D) Some vertebrates
See Answer:

21. Reptiles were dominant animals during the—
(A) Mesozoic era (B) Palaeozoic era (C) Cenozoic era (D) Proterozoic era
See Answer:

22. Changes in DNA nucleotide sequences is known as—
(A) Mutagen (B) Mutation (C) Recombination (D) Translation
See Answer:

23. Hydrolytic enzymes that are active at low pH are termed—
(A) Proteases (B) Peroxidases (C) a-amylases (D) Hydrolases
See Answer:

24. The cartilage that is found at the end of long bones, is—
(A) Calcified (B) Hyaline (C) Elastic (D) Fibrous
See Answer:

25. Melanin in the mammalian skin provides protection from—
(A) Heat loss (B) Ultraviolet rays (C) Infra-red rays (D) Water loss
See Answer: