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The following question based on physiology of plants, humans and animals topic of general science mcq

Questions : Stomata open and close due to

(a) genetic clock

(b) pressure of gases inside the leaves

(c) circadian rhythm

(d) turgor pressure of guard cells

The correct answers to the above question in:

Answer: (d)

Turgor pressure is the pressure that develops in a cell due to the osmotic diffusion of water inside it and is responsible for pushing the membrane against the cell wall.

Stomata open under conditions of increased turgor pressure of guard cells and stomata get closed under conditions of decreased turgor pressure of guard cells.

When turgid, they swell and bend outward. As a result, the stomatal aperture opens. When they are flaccid, the tension from the wall is released and the stomatal aperture closes.

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Read more biology Based General Science Questions and Answers

Question : 1

Study the following statements :

  1. Silviculture is the branch of Botany in which we study about development of forest.
  2. Branch of Agriculture concerned with the production of crops called as Agronomy.
  3. Agrostology is the study of grass.
  4. Spermology is the study of fruits.
Which of the above statements are correct?

a) 1, 2 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2, 3 and 4

Answer: (a)

Spermology is the collection and study of seeds.

Question : 2

Plants are formed like parent plant from

a) Cut stem

b) Both of the above

c) Seeds

d) None of the above

Answer: (a)

Question : 3

Vascular bundles in monocotyledons are considered closed because

a) a bundle sheath surrounds each bundle

b) xylem is surrounded all around by phloem

c) there are no vessels with perforations

d) there is no secondary growth

Answer: (d)

Monocots have usually collateral vascular bundles, a type that is also called closed. The vascular bundle is enclosed by a bundle sheath of parenchyma cells.

Question : 4

Antibodies are

a) immunoglobulins

b) carbohydrates

c) globular proteins

d) extrinsic proteins

Answer: (a)

Antibodies are immunoglobulins (Igs) which are produced in response to antigenic stimulation.

Question : 5

If a cell swells, after being placed in solution, the solution is

a) hypotonic

b) hypertonic

c) neutral

d) isotonic

Answer: (a)

If a cell swells, after being placed in solution, the solution is called Hypotonic.

Question : 6

Which one of the following correctly represents the normal adult human dental formula ?

a) $2/2, 1/1, 3/2, 3/3$

b) $3/3, 1/1, 3/2, 1/1$

c) $2/2, 1/1, 2/2, 3/3$

d) $3/3, 1/1, 3/3, 3/3$

Answer: (c)

The adult dental formula of human is Incisor $2/2$, Canine $1/1$, Premolar $2/2$, Molar $3/3$.

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