Question

1. Explain with an example what is meant by living things respond to stimuli’.

2. How do living things grow? Some non-living things also grow. How is their growth different

from the growth of living things?

3. List three ways in which living things reproduce, giving one example of each. 4. List four different ways in which organisms carry out exchange of gases for respiration, with

one example of each.

5. Explain phototropism and geotropism in plants. Are there any similar examples in the animal

world also?




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Answer 1

Answer:

Reaction on any action of living things is

called stimuli

By the process of cell division the living things grow. Non living things grow do to some chemical changes and they are

reversible

Answer 2

Answer:

1. All living things are able to respond to stimuli in the external environment. For example, living things respond to changes in light, heat, sound, and chemical and mechanical contact. ... The organism responds to the stimuli by means of a number of effectors, such as muscles and glands.

2.Living things grow by the division of cells. Unicellular organisms such as Amoebae grow by an increase in the size of the single cell that makes up the organism. Non-living things grow by the addition of material from outside. For example, a pile of sand will grow if more sand is added to it.

3.The means are as follows:

The means are as follows:Fishes respire using their gills.

The means are as follows:Fishes respire using their gills.Earthworms use their skin for respiration.

The means are as follows:Fishes respire using their gills.Earthworms use their skin for respiration.Insects such as cockroaches breathe through several tracheal tubes in their bodies.

The means are as follows:Fishes respire using their gills.Earthworms use their skin for respiration.Insects such as cockroaches breathe through several tracheal tubes in their bodies.Humans and many other animals such as cows, goats etc. respire through external nostrils, which supplies air to their lungs.

4. Phototropism is the response of a plant to sunlight. Geotropism is the response of stems and roots towards and against the Earth. An example of phototropism in the animal world is ants as they're attracted or they respond to sunlight