What adaptation is unique to CAM plants to conserve water? A. They open stomata

Question

What adaptation is unique to CAM plants to conserve water? A. They open stomata at night B. They physically separate bringing in CO2 from the production of sugars C. They have broad and thin leaves to provide shade D. The use concentrated ammonia metabolites Why is warm water not as good as (worse than) cold water for aquatic animals? A. warm water holds less oxygen than cold water B. warm water is more viscous than cold water C. warm water is more dense than cold water D. warm water has a higher specific heat than cold water

Explanation / Answer

Ans. #1. Correct option A- Besides many adaptions like transformation of leaves into thorns, fewer stomata of fleshy, photosynthesizing stem, etc. the opening of stomata at night also helps conserving water. At night when temperature is relatively lower than day time, the rate of transpiration (thus, rate of loss of water through stomata) is relatively lesser during night time. This adaption is unique to CAM plants.

# Option B- Incorrect. The spatial separation of CO2 uptake and its subsequent fixation into sugars provides an efficient way to minimize loss of water during photosynthesis. However, such adaptations are present in CAM and well as non-CAM plants.

# Option C- Incorrect. CAM plants generally have reduced leaves to minimize loss of water.

# Option D- Incorrect. No observed.

#2. Correct option – A. The solubility of gases in water decreases with increase in temperature. So, there would be lesser content of water-soluble O2 for aquatic animals in warm water – thus posing a life-threatening condition.

A similar lowering of temperature does not cause such a detrimental effect.

# Option B – Incorrect. The viscosity of water increases with water.

# Option C- Warm water has a density lower than that of cold water.

# Option D- Incorrect. Liquid water (irrespective of its being cold or hot) has a specific heat of 4.184 J 0C-1 g-1.

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