Evolution

HOW DO ORGANISMS REPRODUCE: Short Answer Type Questions Class 10th Chapter 10 JKBOSE/NCERT

Leave a Comment / HOW DO ORGANISMS REPRODUCE, Life Processes Class 10th /

Name two unisexual and two bisexual flowers.
Ans: Two examples of unisexual flowers are:
Papaya: It has separate male and female flowers on different plants.
Watermelon: It also has separate male and female flowers on different plants.
Two examples of bisexual flowers are:
Rose: It has both male stamens and female pistils within the same flower.
Sunflower: It also has both male and female reproductive structures within the same flower.

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Biology: Definition, Branches, Botany, Zoology, Systematics, and Significance

Leave a Comment / Botany, Diversity in living organisms /

A few key elements concerning Evolution
About 25 billion years ago, the Universe began to form. About 4 billion years ago, life began. The conditions on Earth at the time of life’s inception are as follows:
1. Extremely hot temperatures, i.e. 800°C
2. Gases such as CH4, NH3, He, H2, and water vapours were present in the form of lighter components.
3. Heavy elements such as Fe (iron) and Nickel (Ni) are found in the Earth’s core.
4. The only source of energy was ultraviolet light, which favoured photochemical reactions.
5. During the period of evolution, there was no molecular oxygen in the atmosphere, i.e. the atmosphere was reduced.

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