Doubtly
@Doubtly · Joined Feb 2021
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- Explain the process of formation of complex proteins. Complex proteins are formed by protein synthesis, which takes place in three steps: transcription, translation and translocation, followed b... 1
- How are the hereditary changes responsible for evolution? Answer: Hereditary changes (variations in genes) are passed from parents to offspring. Over many generations, useful variations accumulate i... 1
- Define vestigial organs. Write names of some vestigial organs in human body and write the names of those animals in whom same organs are functional. Vestigial organs are organs that are reduced and non-functional (useless) in an organism, but are fully developed and functional in some oth... 1
- Define heredity. Explain the mechanism of hereditary changes. Heredity is the transfer of characters (traits) from parents to offspring, generation after generation. Hereditary changes arise when the ge... 1
- short note on Connecting link Some plants and animals show some morphological character by which they can be related to two different groups they can be called connecting... 1
- short note on Evolution Evolution is the gradual change in living organisms over a very long period of time, by which new species are formed from earlier ones. Life... 1
- short note Embryology. Comparative study of embryonic developmental stages of various vertebrates show extreme similarities during initial stages and those similar... 1
- short note Darwin’s theory of natural selection. Darwin's theory of natural selection states that organisms with favourable variations survive and reproduce more, and over generations this... 1
- Short note on Lamarckism 1=Jean-baptiste lamarck proposed that morphological changes occurring in theorganisms are responsible for evolution 2=The reasons behind tho... 2
- Complete the statements by choosing correct options from bracket. (Gene, Mutation, Translocation, Transcription, Gradual development, Appendix) a. Mutation; b. Gene; c. Transcription; d. Gradual development; e. Appendix a. The cause of sudden changes was understood due to the mutatio... 1
- Read the following statements and justify the same in your own words with the help of suitable examples. a. Human evolutio All four statements describe evolution: a. humans evolved gradually over crores of years; b. isolation leads to new species; c. fossils are... 1
- Complete the following diagram. Morphological Similarities in bones structure Evidences of Evolution Evidences of evolution: morphological evidences, anatomical evidences (similarities in bone structure), vestigial organs, palaeontological e... 1
- Form a group of students from your school to demonstrate the mock drill and demonstrate it in the school.
- Demonstrate the activities shown on page no. 106 of std. IX textbook in front of the students of other classes. Make a video clip and send it to others
- Following are the pictures of some disasters. How will be your pre- and post-disaster management in case you face any of those disasters?
- Complete the following chart. Properties of Predisaster management Properties (features) of pre-disaster management: Planning: studying the disasters likely in an area and preparing a disaster management pla... 1
- Explain that why is it said like that? A] Mock drill is useful B] Effective disaster management makes us well prepared for future. A] Mock drill is useful because it trains people to act correctly in a real disaster. B] Effective disaster management makes us well prepare... 1
- Some symbols are given below. Explain those symbols. Which disasters may occur if those symbols are ignored?