Stimulus and Response

Q.

Differentiate between external and internal stimuli

Q.

Give three examples of chemotropism

Q.

How are osmoreceptors activated in the body?

Q.

The growth of pollen tubes towards ovules is due to chemotropism.

1. True
2. False

Q. What is pulvinus and what are its functions?

Q. Growth of pollen tubes towards ovule is an example of _________.

1. phototropism
2. geotropism
3. chemotropism
4. thigmotropism

Q.

I ) When we touch the leaves of a touch-me-not plant, they begin to fold up and droop.

II) When a seed germinates, the root goes down, the stem comes up into the air.

What is the nature of movements in each of these cases?

1. independent of growth, dependent on growth

2. directional movement, independent of direction

3. independent of touch, dependent on touch

4. dependent on growth, independent of growth

Q.

Which of the following is not an example of the response to stimulus?

1. Watering in the mouth when we see delicious food items.

2. Closing of leaves of Mimosa plant when touched.

3. Shutting our eyes when an object is suddenly thrown in our direction.

4. A chick hatching out of an egg.

Q.

Fill in the blanks with suitable reflexive or emphasizing pronouns: - English Q&A

Q. A touch-me-not plant closes its leaf on being touched. is the stimulus in this case.

1. Wind
2. Touch
3. Leaf

Q.

A plant response to stimulus can only be positive.

1. True

2. False

Q.

Which of the following instruments are used to study geotropism?

1. electrical means and ion assimilation

2. electro-chemical means and changing turgor pressure

3. chemical means and ion distribution

4. Both A & B

Q.

The roots of a plant show negative geotropism.

1. True
2. False

Q.

What is chemotropism?

Q.

Give example of the movement of a plant part which is caused by the loss of water.

Q.

The movement of the plant due to touch is called___ .

Q.

When a person is suffering from severe cold he or she cannot

1. Differentiate the taste of an apple from that of an ice cream

2. Differentiate the smell of perfume from that of an Agarbatti

3. Differentiate red light from the green light

4. Differentiate a hot object from a cold object

Q. What is the cephalic phase of digestion?

1. Stimuli which causes psychological changes before the food enters the body
2. Stimuli which causes physiological changes before the food enters the body
3. Stimuli which causes both physiological and psychological changes
4. Stimuli which causes no changes before the food enters the body

Q. The ability of an organism to respond to external stimuli is called as

1. Sensitivity
2. Homeostasis
3. Metabolism
4. Reproduction

Q. Behaviour that involves an external stimulus triggering a genetically determined response is called

1. Innate
2. Learned
3. Conditioned
4. Imprinted

Q.

Any change in the environment, to which an organism responds is called ____.

1. stimulus

2. response

3. tropism

4. dominanace

Q. Which of the following statements regarding the response of living organisms to external stimuli is correct?

1. The external environmental stimuli can be physical, chemical or biological
2. All organisms, from the prokaryotes to the most complex eukaryotes can sense and respond to environmental stimuli
3. Consciousness and response to external stimuli is the defining property of living organisms
4. All of these

Q. Immediate response to stimulus is shown by which of the following plants?

1. Mimosa plant
2. Tulsi plant
3. Rose plant
4. Neem plant

Q. The movement of plant towards the stimulus is called as

1. Tropic
2. Nastic
3. Locomotion
4. None of the above

Q. When you are pricked with a pin, you will draw out your hand very fast. The stimulus is

1. Drawing out hand
2. Pricking with a pin
3. Pin
4. Hand

Q. Which of the following is called as stimulus?

1. Light
2. Temperature
3. Sound
4. All of the above

Q. The stimulus is converted into electrical signals via

1. Transpiration
2. Transportation
3. Transformation
4. Transduction

Q. Which of the following act as an internal stimuli for generation of response?

1. Smell
2. Light
3. Sound
4. Thyroxine

Q. Which of the following part of the plant shows negative geotropism?

1. Roots
2. Both A and B
3. Stems
4. Leaves

Q. Receptors for taste, smell and for blood oxygen are called as

1. Mechanoreceptors
2. Chemoreceptors
3. Nociceptors
4. Thigmoreceptors