Tropic Movements and Plant Responses – Worksheet Extraction

The diagram shows a type of tropism in a flower’s reproductive structure. Name and define the type of tropism shown.

• Phototropism: growth in response to light

• Chemotropism: directional growth in response to specific chemicals

• Thigmotropism: growth in response to touch

• Geotropism: growth in response to gravity

In the same diagram, identify the labelled parts (1) to (4). Choose the correct set.

• (1) stigma, (2) pollen tube, (3) style, (4) ovule

• (1) anther, (2) filament, (3) ovary, (4) seed

• (1) petal, (2) sepal, (3) style, (4) embryo sac

• (1) stigma, (2) style, (3) pollen grain, (4) ovary

Name two effective stimulants that help in the growth of the part labelled 2 in the diagram.

• Light and temperature

• Sugars and growth regulators from the stigma/style

• Carbon dioxide and oxygen

• Soil minerals and root exudates

Name two groups of plants in which the part labelled 2 grows toward the female gametophyte with the help of these stimulants.

• Bryophytes and pteridophytes

• Gymnosperms and angiosperms

• Algae and fungi

• Monocots and dicots are animal groups

Refer to the two tendril diagrams labeled X (A) and Y (B). Identify X and Y correctly.

• X: leaf tendril; Y: stem tendril

• X: root hair; Y: adventitious root

• X: petiole; Y: leaf blade

• X: stem; Y: flower stalk

State the function performed by structures X and Y in the tendril diagrams.

• Photosynthesis and storage

• Support by coiling around a support

• Water conduction and transport

• Protection from herbivores

Name and define the phenomenon depicted by the tendril diagrams.

• Phototropism: bending toward light

• Thigmotropism: directional growth in response to touch/contact

• Geotropism: growth toward gravity

• Chemotropism: growth guided by chemicals

How do structures X and Y differ from each other in the tendril diagrams?

• X is a modified leaf; Y is a modified stem

• X is a root; Y is a flower

• X performs photosynthesis; Y performs transpiration

• X is woody; Y is reproductive

Give one correct pairing of plants that show the phenomenon in the tendril diagrams.

• Pea shows leaf tendrils; cucumber shows stem tendrils

• Mango shows leaf tendrils; wheat shows stem tendrils

• Rice shows leaf tendrils; banyan shows stem tendrils

• Sunflower shows leaf tendrils; fern shows stem tendrils

From the set of figures showing shoot and root responses, name the kind of movements shown by the root system and shoot system, and choose the correct definition pair.

• Roots show positive phototropism; shoots show negative phototropism—growth toward/away from light

• Roots show positive geotropism; shoots show negative geotropism—growth toward/away from gravity

• Roots show positive thigmotropism; shoots show negative thigmotropism—growth due to touch

• Roots show positive chemotropism; shoots show negative chemotropism—growth due to chemicals