Question

Write the calorific value of CNG.LPG, Kerosene and Hydrogen.

2. Write the name of dry powder chemicals name released C02.
3. Write the size of smallest and largest cell?
4. Write the three different stages of frog?
5. What is metamorphosis? Give examples.
6. Define budding processes with suitable example?
7. Why plant cells need cell wall?

8. Which chemical mixture is used to make head of a match sticks? {

9. In an experiment 6 gram of a fuel was completely burnt. The heated produced was measured 270 Kj.

Calculate the calorific value of the fuel?

10. Explain why chloroplasts are found only in plant cells?

11. Write three differences between external fertilization and internal fertilization?

12. Describe the development of embryo?

13. Make sketches of animal and plant cell? {4M}

14. Make a labelled diagram of a candle flame?


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Answer 1

Answer:

Answer:12. Each embryo starts development as a zygote, a single cell resulting from the fusion of gametes (i.e. fertilization of a female egg cell by a male sperm cell). Next, the cells in a blastula-stage embryo start rearranging themselves into layers in a process called gastrulayion.

11. Internal fertilization is the process when the syngamy (union of male and female gamete) occurs inside the female body after insemination using copulation. In contrast, External fertilization is the syngamy outside the female body, that is in the outer environment especially in water bodies

10. Chloroplasts are found in plant cells only because chloroplasts contain chlorophyll which is essential for photosynthesis. Chlorophyll traps sunlight and uses it to prepare food for plants by the process of photosynthesis.