National Examinations Board (+2)
+2 Science (Class 11 and 12)
Class 12 · NEB 2082 (MCQs)
Course Title: Biology (Bio)
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.
Group A
Section : I (Botany)(5 × 1 = 5)
- 1.1
Which of the following term describes pollen tube entry into the embryo sac of ovule through micropyle during fertilization? a) Mesogamy b) Chalazogamy c) Syngamy d) Porogamy
- 2.1
Which of the following structures in a plant is primarily responsible for regulating transpiration? a) Xylem b) Stomata c) Root hairs d) Phloem
- 3.1
Which of the following genetic disorders is caused by a point mutation? a) Down's Syndrome b) Turner's Syndrome c) Sickle Cell Anaemia d) Klinetelter's syndrome
- 4.1
A botanist observes scattered vascular bundles throughout the ground tissue in a plant stem. What is the most appropriate conclusion? a) The plant is monocot. b) The plant undergoes secondary growth. c) The plant has an open vascular bundle. d) The plant is a dicot.
- 5.1
If a plant is placed in a sealed bell jar with limited oxygen, how will its energy production be affected over time? a) ATP production will increase due to higher glycolysis. b) The plant will rely on anaerobic respiration producing less ATP. c) The citric acid cycle will become faster to make up for lack of oxygen. d) The electron transport chain will continue functioning normally. GROUP: A | Section : II (Zoology) | 6 × 1 = 6
- 12.1
Which of the following cell produces histamin and heparin ? a) Plasma cells b) WBC c) Macrophage cells d) Mast cells
- 13.1
Which is the first stage of embryonic development after fertilization in frog's zygote? a) Blastulation b) Morulation c) Cleavage d) Gastrulation
- 14.1
After complete digestion of food in duodenum, food changes into milky juice like fluid. What is this state of food called? a) Bolus b) Chyme c) Faeces d) Chyle
- 15.1
Most of the organ transplantations have rejection issue. Which of the following organ transplant has no rejection problem? a) Cornea transplant b) Lung transplant c) Kidney transplant d) Skin transplant
- 16.1
What is the term called for the addition of individuals in a population from outside or from another population? a) Emigration b) Immigration c) Migration d) Dispersion
- 17.1
Identify the pair of disease transmitted through contaminated food and water. a) Typhoid and cholera b) Typhoid and TB c) Cholera and TB d) Cholera and candidiasis
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