All Free Everyday Science MCQs with Answers

1061. Which of the following is a tissue?

• A. Blood
• B. Lungs
• C. Kidney
• D. pancreas

Explanation: Blood is a connective tissue because its cells are suspended in a liquid matrix called plasma and it transports materials throughout the body. Lungs, kidneys and the pancreas are organs made of several tissue types.

1062. Main use of salt in diet is to : ___________?

• A. ease the process of cooking
• B. increase the taste
• C. produce small amount of hydrochloric acid required for digestion
• D. inclease solubility of food particles in water

Explanation: Chloride from dietary salt helps form hydrochloric acid in the stomach, which is needed for digestion. Increasing taste is a culinary benefit, but the question asks for its physiological role.

1063. Erythrocyte is another name for a ___________?

• A. white blood Cells
• B. Platelet
• C. Red Blood cells
• D. Plasma

Explanation: Erythrocytes are red blood cells, named from Greek words meaning red and cell. They contain haemoglobin and transport oxygen through the blood.

1064. The blood pressure is denoted as following?

• A. Systolic Pressure / Diastolic Pressure
• B. Diastolic Pressure / Systolic Pressure
• C. Venous Pressure / Systolic Pressure
• D. Systolic Pressure / Pulse Pressure

Explanation: Blood pressure is written as systolic pressure over diastolic pressure, such as 120/80 mmHg. Systolic pressure occurs during heart contraction, while diastolic pressure occurs during relaxation.

1065. Which of the Following Hormones Regulate Blood Sodium and Potassium Levels in the Body?

• A. Aldosterone
• B. Cortisol
• C. Glycogens
• D. Pheromones

Explanation: Aldosterone, produced by the adrenal cortex, increases sodium reabsorption and promotes potassium excretion by the kidneys. Cortisol has different primary roles, while glycogen and pheromones are not hormones regulating these electrolytes.

1066. Calcium level in the blood is regulated by the: ___________?

• A. Thyroid
• B. Parathyroid
• C. Adrenal medulla
• D. A and B

Explanation: Blood calcium is regulated mainly by parathyroid hormone and calcitonin, the latter produced by the thyroid gland. Therefore, both the thyroid and parathyroid are involved.

1067. Which part of the brain controls the Pituitary Gland?

• A. Hindbrain
• B. Hypothalamus
• C. Hippocampus
• D. Midbrain

Explanation: The hypothalamus controls the pituitary through releasing and inhibiting hormones and also regulates its connection with the nervous system. The hippocampus is mainly involved in memory, not pituitary control.

1068. The process which is essential for continuing and survival of species is __________?

• A. Digestion
• B. Respiration
• C. Reproduction
• D. Excretion

Explanation: Reproduction is essential for the continuation of a species because it produces new individuals. Digestion, respiration, and excretion sustain individual organisms but do not directly continue the species.

1069. The part of brain involved in balance and precision in movements is: __________?

• A. Cerebrum
• B. Cerebellum
• C. Thalamus
• D. Medulla oblongata

Explanation: The cerebellum coordinates balance, posture, and the accuracy of voluntary movements. The cerebrum handles conscious thought and voluntary motor commands, but fine coordination is chiefly the cerebellum’s role.

1070. What is the largest cell in the human body?

• A. Ovum
• B. RBCs
• C. Sperm cell
• D. Neuron

Explanation: The human ovum is the largest human cell by diameter, whereas a sperm cell is among the smallest. Red blood cells and neurons are not larger than the ovum in this standard comparison.