Tag: photosynthesis and respiration

Questions Related to photosynthesis and respiration

Which of the following show higher rate of respiration?

biology photosynthesis and respiration experiments on photosynthesis cellular respiration introduction to respiration

  1. Collenchyma

  2. Leaf

  3. Dry seeds

  4. Germinating seeds

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Correct Option: D
Explanation:

An alarmed rate of respiration is seen in germination of seeds. Higher respiration rate is seen in floral vegetative bud, germinating seedlings, young leaves, etc.

Oxygen is necessary for the germination of seeds.

biology photosynthesis and respiration experiments on photosynthesis cellular respiration introduction to respiration

  1. True

  2. False

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Correct Option: A

Choose the correct answer from the alternatives given.
With the increase in temperature, the respiratory rate will

biology photosynthesis and respiration experiments on photosynthesis cellular respiration introduction to respiration

  1. decrease slowly

  2. decrease rapidly

  3. increase

  4. remain unaffected

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Correct Option: C
Explanation:

As the temperature increases, the kinetic energy also increases and this increases the rate of reactions. Due to this the rate of cellular respiration also increases. So, the correct option is 'increase'.

Which of the following is the least effective in photosynthesis?

biology photosynthesis and respiration experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments

  1. Red light

  2. Blue light

  3. Green light

  4. Violet

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Correct Option: C
Explanation:
Green is the least effective color of light in driving photosynthesis. Photosynthesis occurs in plants and algae using chlorophyll, and because chlorophyll reflects rather than absorbs green light, green light cannot be used in the photosynthetic process.
So, the correct answer is option C.

The pigment that absorbs red and far red light in plant is 

biology photosynthesis and respiration experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments

  1. Cytochrome.

  2. Xanthophyll.

  3. Phytochrome.

  4. Carotene.

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Correct Option: C
Explanation:

Phytochrome is a photoreceptor, a pigment that plants, and some bacteria and fungi, use to detect light. It is sensitive to light in the red and far-red region of the visible spectrum. Many flowering plants use it to regulate the time of flowering based on the length of day and night (photoperiodism) and to set circadian rhythms. It also regulates other responses including the germination of seeds, elongation of seedlings, the size, shape, and number of leaves, the synthesis of chlorophyll, and the straightening of the epicotyl or hypocotyl hook of dicot seedlings. 

So, the correct answer is option C.

The phenomenon of response seen in plants towards light is called as 

biology photosynthesis and respiration experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments

  1. Phototropism.

  2. Geotropism.

  3. Reflex action.

  4. Spectroscopy.

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Correct Option: A
Explanation:

Geotropism (also known as gravitropism) is a turning or growth movement by a plant or fungus in response to gravity. It is a general feature of all higher and many lower plants as well as other organisms. 

Phototropism is the orientation of a plant or other organism in response to light, either toward the source of light (positive phototropism) or away from it (negative phototropism).
A reflex action, differently known as a reflex, is an involuntary and nearly instantaneous movement in response to a stimulus. Scientific use of the term "reflex" refers to a behavior that is mediated via the reflex arc. 
Spectroscopy is the study of the interaction between matter and electromagnetic radiation. Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, by a prism. 
So, the correct answer is option A.

Word dark reaction for biosynthetic phase of photosynthesis is misnomer word because ___________________.

biology photosynthesis and respiration experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments

  1. Dark reaction occur during dark

  2. Dark reaction occur during day

  3. Dark reaction is completely free from light

  4. Dark reaction occur during short dark intervals

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Correct Option: A

A green plant bends towards the source of light when exposed to the light on only one side, it bends towards the source of light as it grows. Which of the following is the best explanation of the phenomenon 

biology photosynthesis and respiration experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments

  1. The apices of their stems are attracted by light

  2. They need light for photosynthesis

  3. Some auxins accumulates on the shaded side to induce greater cell elongation on that side

  4. Light stimulates the cells on the illuminated side to increase in length

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Correct Option: C
Explanation:

Accumulation of auxin as the apex of the plant, which is responsible for the phototropism movement so that plant cells are elongated.

So the correct option is C.

Two green plants are kept separately in oxygen free containers, one in the dark and the other in continuous light. Which one will live longer? 

biology photosynthesis and respiration experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments

  1. The plant kept in dark

  2. The plant kept in light

  3. Both the plants will live for the same time

  4. None of the above

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Correct Option: B
Explanation:

The plant kept in continuous light will live longer, because it will be able to produce oxygen required for its respiration by the process of photosynthesis.

Oxygen is evolved as a by-product of photosynthesis during photolysis of water.
So, the correct answer is option B.

(i) Pluck the leaf to be experimented
(ii) Cover a portion of leaf on both sides by using strips of black paper
(iii) Keep the plant in dark place for three days to destarch its leaves.
(iv) Test the experimental leaf the the presence of starch 
(v) Expose the plant to sunlight for four hours 
(vi) Remove the black paper strip from the leaf

Given in the box are steps written randomly for the experiment to show that light is essential for photosynthesis. Which of the following sequences of steps is to be followed by the successful run of the experiment?

biology photosynthesis and respiration experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments

  1. (i), (iii), (ii) (iv), (v), (vi)

  2. (ii), (i), (v), (vi), (iii), (iv)

  3. (iii), (ii), (v), (i), (vi), (iv)

  4. (v), (ii), (i), (iii), (iv), (vi)

Show answer
Correct Option: C
Explanation:

The starch in the leaves is eliminated by keeping the plant in a dark place for 3 days. A leaf is selected and covered with a black strip on both sides. The plant is kept in sunlight for 4 hours. The experimental leaf is plucked and the strip is removed from it to perform the starch test. It is found that he leaf covered with black paper will turn brown and the part of the exposed leaf will turn blue-black. This result proves that starch is formed in the leaf where sunlight is available and is not formed in absence sunlight. Thus the correct answer is option  C.