D. Answer the following.
1. List the characteristics by which we recognise a living being.
2. Name one unicellular and one multicellular organism.
3. Why are animals called heterotrophs?
4. Mention two ways in which plants respond to stimuli.
5. Name the waste products released during respiration.
6. Mention two ways in which animals reproduce.
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Answers
Answer:
- 1)Nutrition. Living things take in materials from their surroundings that they use for growth or to provide energy. ...
- Respiration. ...
- Movement. ...
- Excretion. ...
- Growth.
- Reproduction. ...
- Sensitivity.
2)unicellular - Amoeba
multicellular. - human beings
3)Animals depend on other organisms for getting their food. They cannot make their own food, so they are heterotrophs.
- 4) Plants responds to sunlight which is known as phototropism. For e.g. as you can see the sunflower turn itself always towards the light.
- Plants respond to changes in the environment by growing their stems, roots, or leaves toward or away from the stimulus
5) Cells undergoing aerobic respiration produce 6 molecules of carbon dioxide, 6 molecules of water, and up to 30 molecules of ATP (adenosine triphosphate), which is directly used to produce energy, from each molecule of glucose in the presence of surplus oxygen.
6) Animals can reproduce in two different ways which are Asexual Reproduction and Sexual Reproduction. In Asexual Reproduction there is no formation of gametes and offsprings are genetically identical to the parent.
Just as in plants, there are two modes by which animals reproduce. These are: (i) Sexual reproduction, and (ii) Asexual reproduction.