Exercise Science Grade 9

A group of researchers wanted to find out if different types of light affect plant growth. They placed one plant under fluorescent lights in a lab and another plant under natural sunlight outside. After three weeks, both plants showed significant growth. What conclusion can be drawn from this experiment?

• Plants only thrive under natural sunlight.

• Plants cannot grow under artificial lights.

• Plants can grow well under both natural and artificial light conditions.

• Plants do not require light to grow.

A student conducted an experiment where they heated a leaf in boiling water, then immersed it in ethanol, rinsed it in warm water, and finally applied a solution of iodine. What is the purpose of using ethanol in this procedure?

• To dehydrate the leaf.

• To extract chlorophyll for better visibility of the color change.

• To enhance the starch content in the leaf.

• To stop the leaf from wilting.

A group of students is debating the factors essential for plant growth: Alex: “Water is the only thing that plants need to survive.” Jamie: “Sunlight is crucial for photosynthesis, which helps plants grow.” Taylor: “Plants can grow without soil if they have enough water and light.” Who is correct?

• Alex only

• Jamie only

• Taylor only

• None of them

After a week of heavy rain, Sam noticed that his garden plants were thriving. What is the significance of water for the health of these plants?

• Water helps in the photosynthesis process.

• Water provides nutrients directly to the leaves.

• Water aids in the growth of roots by providing necessary minerals.

• Water maintains the plant's structure by creating turgor pressure.

During a photosynthesis experiment, a green plant was observed to produce bubbles in sunlight. When the light was turned off, the bubble production ceased. What gas is being produced and what causes the cessation in the absence of light?

• Carbon dioxide, because the plant cannot perform photosynthesis.

• Oxygen, because light is essential for photosynthesis to occur.

• Hydrogen, because the plant's water uptake is halted.

• Nitrogen, because the plant is not receiving enough nutrients.

Two flowers are observed. Flower A has large, brightly colored petals and produces nectar. Flower B has small, dull petals and long feathery stigmas. Which best explains their difference?

• Flower A is adapted for wind pollination, while Flower B is for insect pollination.

• Flower A is adapted for insect pollination, while Flower B is for wind pollination.

• Both flowers rely only on self-pollination.

• Both flowers will not undergo fertilisation.

Which of the following shows the correct sequence involved in the sexual reproduction of a flowering plant?

• Fertilisation → Germination → Pollination → Seed dispersal

• Germination → Seed dispersal → Fertilisation → Pollination

• Pollination → Fertilisation → Seed dispersal → Germination

• Seed dispersal → Pollination → Germination → Fertilisation

Which statement best explains why seeds must be dispersed away from the parent plant?

• To prevent seeds from being eaten by animals

• To help seeds grow only in fertile soil

• To make plants reproduce faster

• To reduce competition for sunlight, water, and nutrients

Which of the following is a female part of a flower?

• Anther

• Filament

• Pollen

• Stigma

Which of the following best explains why adaptations are considered essential for the survival of organisms?

• Adaptations help organisms migrate to new habitats.

• Adaptations make organisms stronger than others.

• Adaptations prevent predators from existing in ecosystems.

• Adaptations allow organisms to survive and reproduce in specific environments.