91. Which of these reactions occur in photosysnthesis?
(A) Carbon dioxide is reduced and water is oxidised
(B) Water is reduced and Carbon dioxide is oxidised
(C) Carbon dioxide and water are oxidised.
(D) Carbon dioxide and water are reduced.
Answer:
(A) Carbon dioxide is reduced and water is oxidised
Explanation:
During photosynthesis, water () is photochemically oxidized to release oxygen gas, while the captured electrons are used to reduce atmospheric carbon dioxide () into energy-rich glucose.
92. The maximum volume of air contained in the lung by a full forced inhalation is called:
(A) Tidal Volume
(B) Vital Capacity
(C) Ventilation rate
(D) Total lung capacity
Answer:
(D) Total lung capacity
Explanation:
Total lung capacity (TLC) is the maximum absolute volume of air that the lungs can structurally contain following a maximal, forcefully deep inhalation.
93. Example of naturally vegetative plants are:
(A) Potato, Onion, ginger, sugarcane
(B) Tomato, ladyfinger, onion, cauliflower
(C) Ladyfinger, onion, ginger, sugarcane
(D) Cauliflower, onion, potato, tomato
Answer:
(A) Potato, Onion, ginger, sugarcane
Explanation:
Potatoes (tubers), onions (bulbs), ginger (rhizomes), and sugarcane (stem cuttings) can all aggressively reproduce naturally without seeds through various forms of vegetative propagation.
94. Heart is covered with the covering of:
(A) Peri cardium
(B) Pleural membrane
(C) Mucous membrane
(D) Peri toneum
Answer:
(A) Peri cardium
Explanation:
The pericardium is a specialized, double-walled fibrous sac that physically encloses the heart, providing protection and reducing friction during contractions.
95. Bile juce help in the digestion of:
(A) Proteins
(B) Starch
(C) Fats
(D) Fibres
Answer:
(C) Fats
Explanation:
Secreted by the liver, bile juice acts as a critical biological surfactant, emulsifying large fat globules into tiny droplets so enzymes (lipases) can easily digest them in the small intestine.
