Biology Quiz for Grade XII

Which of the following term describes pollen tube entry into the embryo sac of ovule through micropyle during fertilization?

• Mesogamy

• Chalazogamy

• Syngamy

• Porogamy

Which of the following structures in a plant is primarily responsible for regulating transpiration?

• Xylem

• Stomata

• Root hairs

• Phloem

Which of the following genetic disorders is caused by a point mutation?

• Down’s Syndrome

• Turner’s Syndrome

• Sickle Cell Anaemia

• Klinetelter’s syndrome

A botanist observes scattered vascular bundles throughout the ground tissue in a plant stem. What is the most appropriate conclusion?

• The plant is monocot.

• The plant undergoes secondary growth.

• The plant has an open vascular bundle.

• The plant is a dicot.

If a plant is placed in a sealed bell jar with limited oxygen, how will its energy production be affected over time?

• ATP production will increase due to higher glycolysis.

• The plant will rely on anaerobic respiration producing less ATP.

• The citric acid cycle will become faster to make up for lack of oxygen.

• The electron transport chain will continue functioning normally.

Which of the following cell produces histamin and heparin?

• Plasma cells

• WBC

• Macrophage cells

• Mast cells

Which is the first stage of embryonic development after fertilization in frog's zygote?

• Blastulation

• Morulation

• Cleavage

• Gastrulation

After complete digestion of food in duodenum, food changes into milky juice like fluid. What is this state of food called?

• Bolus

• Chyme

• Faeces

• Chyle

Most of the organ transplantations have rejection issue. Which of the following organ transplant has no rejection problem?

• Cornea transplant

• Lung transplant

• Kidney transplant

• Skin transplant

What is the term called for the addition of individuals in a population from outside or from another population?

• Emigration

• Immigration

• Migration

• Dispersion