Tag: botany

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Multiple choice botany plant nutrition experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

It is advantageous to use a water plant to demonstrate photosynthesis other than a land plant because

  1. It photosynthesize rapidly

  2. It respires slowly

  3. It does not transpire
  4. O$ _2$ bubbles from cut water plant can be collected over H$ _2 $O
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice botany plant nutrition experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

The chemical compound used in the experiment to show that oxygen is evolved during photosynthesis is

  1. KOH.

  2. NaOH.
  3. KHCO$ _{3}$.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Potassium bicarbonate (KHCO3) is commonly used in photosynthesis experiments to provide a controlled source of carbon dioxide for aquatic plants. When the plant performs photosynthesis, the oxygen evolved can be collected and observed.

Multiple choice botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

In 1772, Joseph Priestley demonstrated that

  1. Plants foul the air

  2. Animals purify the air during day time

  3. Plants and animals restore air for each other

  4. Plants get killed in the air produced by animals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Joseph Priestley discovered oxygen which is used by the plant and animals. He demonstrated that plants liberate oxygen as a product during photosynthesis and that oxygen is utilised by the animals during respiration. Further, plant consumes the carbon dioxide, exhaled by the animals, to carry out photosynthesis. Thus plants and animals restore air for each other.
So the correct answer is 'Plants and animals restore air for each other'.
Multiple choice botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

Hydrilla leaf is used in an experiment to test that

  1. Chlorophyll is necessary for photosynthesis.

  2. Light is necessary for photosynthesis.
  3. CO$ _{2}$ is necessary for photosynthesis.

  4. Oxygen is evolved during photosynthesis.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To test that oxygen is evolved during photosynthesis few fresh Hydrilla plants in a glass beaker filled with water. A pinch of KHCO$ _{3}$ is added to it. It is kept in sunlight. After some time some bubbles (oxygen) escapes from the plant. This proves that oxygen is produced during the photosynthesis. It is evolved during the light reaction of the photosynthesis.

So, the correct answer is option D.

Multiple choice botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

Green plants, normally do not suffer from the deficiency of

  1. Phosphorus

  2. Sulphur

  3. Iron

  4. Carbon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Green plants generally do not suffer from phosphorus deficiency because it is a vital component of nucleic acids, ATP, and phospholipids, and plants have evolved efficient uptake mechanisms. While other elements are also essential, phosphorus is frequently cited in this context regarding plant nutrition and soil availability.

Multiple choice botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

How many molecules of water are needed by a green plant to produce one molecule of hexose reduce $6$ molecules of $CO _{2}$?

  1. $6$
  2. $12$
  3. $24$

  4. Only one
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The balanced equation for photosynthesis is 6CO2 + 12H2O -> C6H12O6 + 6O2 + 6H2O. To produce one molecule of hexose (C6H12O6) from 6 molecules of CO2, 12 molecules of water are consumed, but 6 are released, resulting in a net requirement of 6 molecules of water.

Multiple choice botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

Oxygen evolution takes place during photosynthesis in green plants but not in bacterial photosynthesis, because _________________.

  1. Bacteria are prokaryotic and green plants are eukaryotic

  2. Only photo system I is present in bacterial photosynthesis

  3. Bacterial cell wall composition is different from green plant cell wall
  4. Rate of $O _2$ consumption in bacteria is higher than that in green plants
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxygen evolution in green plants is driven by Photosystem II, which performs the photolysis of water. Photosynthetic bacteria lack Photosystem II and possess only Photosystem I, utilizing other electron donors like hydrogen sulfide instead of water, and therefore do not release oxygen.

Multiple choice botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

Match List-I with List-II and select the correct answer.

List-I List-II
a. Richnmond lang effect $1$. Reversal of red-drop
b. Emerson effect $2$. Inhabitation of glycolysis by oxygen
c. Pasteur effect $3$. Inhibition of photosynthesis by oxygen
d. Warburg effect $4$. Senscescence retardation in detached leaves
  1. A-$1$, B-$4$, C-$2$, D-$3$
  2. A-$4$, B-$1$, C-$3$, D-$2$
  3. A-$1$, B-$4$, C-$3$, D-$2$
  4. A-$4$, B-$1$, C-$2$, D-$3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Richmond-Lang effect refers to senescence retardation in leaves by cytokinins (4). Emerson effect is the enhancement of photosynthesis (reversal of red-drop) (1). Pasteur effect is the inhibition of glycolysis by oxygen (2). Warburg effect is the inhibition of photosynthesis by high oxygen concentration (3).

Multiple choice botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

The upper dormant seeds of cocklebur(Xanthium) germinate only under high oxygen levels. The oxygen is required for _______________.

  1. Degradation of inhibitors

  2. Synthesis of promoters

  3. Respiration

  4. Photorespiration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In many dormant seeds, oxygen is required for the aerobic respiration process that provides the energy and metabolic intermediates necessary to degrade growth inhibitors (like ABA) that maintain dormancy.

Multiple choice botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases
Ingenhousz in an experiment showed that in bright sunlight, small bubbles were formed around the green parts of the plant, while in the dark, they did not. He identified these bubbles to be of ____________.
  1. $CO _{2}$
  2. $H _{2} O $
  3. $O _{2} $
  4. $H _{2} $
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Jan Ingenhousz (1730-1799), in his experiment with an aquatic plant, showed that in bright sunlight, small bubbles were formed around the green parts while in the dark, no such bubbles formed. He found out these bubbles to be of oxygen. He thus, confirmed that purification of air or formation of dephlogiston is carried out by green plants only in presence of sunlight.