Sensitivity Questions

Objective Questions

What is sensitivity in living organisms?

(A) The ability to move from one place to another (B) The ability to detect and respond to stimuli (C) The ability to generate energy from the sun (D) The process of digestion and absorption of food

Correct Answer: (B) The ability to detect and respond to stimuli

Which of the following best defines a stimulus?

(A) A change in an organism’s genetic makeup (B) Any environmental change that triggers a response (C) The structural component of a cell (D) The movement of a plant toward light

Correct Answer: (B) Any environmental change that triggers a response

What is the biological term for an organism’s ability to respond to stimuli?

(A) Photosynthesis (B) Locomotion (C) Irritability (D) Respiration

Correct Answer: (C) Irritability

The movement of an entire organism in response to a stimulus is referred to as:

(A) Tropism (B) Taxism (C) Nastism (D) Geotropism

Correct Answer: (B) Taxism

What is phototaxis?

(A) Movement in response to chemical substances (B) Movement in response to changes in osmotic pressure (C) Movement toward or away from a light source (D) Movement in response to temperature fluctuations

Correct Answer: (C) Movement toward or away from a light source

Which of the following is an example of chemotaxis?

(A) A plant growing toward sunlight (B) An amoeba moving away from acidic conditions (C) A fish swimming against a current (D) A flower closing at night

Correct Answer: (B) An amoeba moving away from acidic conditions

Which term describes plant movements that occur regardless of the direction of the stimulus?

(A) Tropism (B) Taxism (C) Nastism (D) Cyclosis

Correct Answer: (C) Nastism

Nyctinasty is a form of plant movement triggered by:

(A) Chemical exposure (B) Gravity (C) The transition between day and night (D) Touch

Correct Answer: (C) The transition between day and night

What is thigmotropism?

(A) Growth in response to water (B) Growth in response to light (C) Growth in response to gravity (D) Growth in response to touch

Correct Answer: (D) Growth in response to touch

A plant's roots growing toward water is an example of:

(A) Phototropism (B) Geotropism (C) Hydrotropism (D) Chemotropism

Correct Answer: (C) Hydrotropism

What is the primary function of movement in living organisms?

(A) To maintain homeostasis (B) To obtain food, escape predators, and find favorable conditions (C) To produce energy through cellular respiration (D) To synthesize proteins and store nutrients

Correct Answer: (B) To obtain food, escape predators, and find favorable conditions

Cyclosis refers to:

(A) The movement of an entire organism (B) The circulation of cytoplasm within a cell (C) The ability of plants to close their stomata (D) The process of cellular respiration

Correct Answer: (B) The circulation of cytoplasm within a cell

Which of the following organisms moves using pseudopodia?

(A) Euglena (B) Paramecium (C) Amoeba (D) Chlamydomonas

Correct Answer: (C) Amoeba

Cilia are used for movement by which of the following organisms?

(A) Amoeba (B) Paramecium (C) Hydra (D) Bacteria

Correct Answer: (B) Paramecium

Which locomotory organelle is a long, whip-like structure that propels certain microorganisms?

(A) Pseudopodia (B) Cilia (C) Flagella (D) Myosin filaments

Correct Answer: (C) Flagella

In Euglena, movement is primarily facilitated by:

(A) Cilia (B) Pseudopodia (C) Flagella (D) Muscular contractions

Correct Answer: (C) Flagella

Which of the following is NOT an example of locomotion in unicellular organisms?

(A) Flagellar movement (B) Ciliary beating (C) Amoeboid movement (D) Muscle contraction

Correct Answer: (D) Muscle contraction

The ability of plants to grow toward or away from a stimulus is called:

(A) Reflex action (B) Homeostasis (C) Tropism (D) Cyclosis

Correct Answer: (C) Tropism

Which of the following is an example of a negative response to a stimulus?

(A) A plant shoot bending toward light (B) A fish swimming toward oxygen-rich water (C) A moth moving away from bright light (D) Pollen tubes growing toward the ovary

Correct Answer: (C) A moth moving away from bright light

Which part of a plant is most likely to exhibit negative geotropism?

(A) The roots (B) The leaves (C) The stem (D) The flower

Correct Answer: (C) The stem

Theory Questions

Define cyclosis

State two uses of cilia to paramecium

Name two growth movements that are controlled by auxins in plant

Give three examples of tactic responses

State the differences between nastic and tropic responses