Small openings under the leaf surface through which gaseous exchange and water loss takes place is known as

  • pollen grain
  • stomata
  • petal
  • stigma

The largest percentage composition in air is of

  • argon
  • oxygen
  • nitrogen
  • carbon dioxide

Photosynthesis decreases the concentration of carbon dioxide in air and other harmful wastes, this increases the purification of respiratory disease for

  • none of them
  • living beings
  • only plants
  • only animals

Photosynthesis is a process that converts waste products to useful substance, which in result provide

  • oxygen
  • energy
  • neon
  • carbon dioxide

For most plants, the rate of photosynthesis does not increase at

  • constant temperature
  • lower temperature
  • higher temperatures
  • doesn't matter temperature

The process of photosynthesis increases when the light gets

  • dim
  • brighter
  • off
  • none of them

Light is absorbed by some substances, these substances are known as

  • pigment
  • surface
  • vein
  • Salk

Respiration takes place in

  • day
  • night
  • day & night
  • none of them

Plant products like timber, rubber, herbs, medicines resin and oils are derived from

  • respiration
  • photosynthesis
  • processing
  • transpiration

At midday, the leaves

  • respiration
  • photosynthesis
  • mainly photosynthesis and some respiration
  • none of them

The number of factors that affect the rate of photosynthesis are

  • four
  • three
  • two
  • five

Which of these is true about photosynthesis?

  • It occurs in both animal and plants
  • It occurs in both fungi and plants
  • it is a breaking down process
  • it is building up process

At midnight, the process taking place in the leaves is called

  • photosynthesis
  • mainly photosynthesis and some respiration
  • none of them
  • respiration

Plants need oxygen

  • to make pollen that is lighter than air in their flowers
  • to combine with hydrogen from the soil and make water
  • to make food as part of the process of photosynthesis
  • To breakdown food that they have stored and use it to grow

The fall in the rate of photosynthesis takes place when the temperature rises above

  • 40 °C
  • 30 °C
  • 20 °C
  • 25 °C

Glucose and oxygen combine to form carbon dioxide and water plus

  • oxygen
  • energy
  • neon
  • nitrous oxide

The rate of photosynthesis is affected when the temperature is too

  • hot
  • mild
  • cold
  • hot or cold

Photosynthesis increases the concentration of oxygen in air, which is necessary for all

  • living organism
  • fossils
  • birds only
  • animals

All animals need oxygen and most of this oxygen comes from

  • roots
  • plants
  • stem
  • pollen grain

The products of photosynthesis are oxygen and

  • Starch and Sucrose
  • Glucose
  • Starch
  • water
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