Question

Q.13 Differentiate between internal fertilisation and external fertilisation.
Q.14 Name the bacterium found in the roots of pea plant. How is this bacterium useful for hu
Section-C
Q.15 Write a short paragraph on the harms caused by microorganisms.
Q.16 What is a cell? Who discovered the cell and write the name of one microscopic organisi
Q.17 How have fossil fuels been formed ?
Q.18 Sketch larynx and explain its function in your own words.
Q.19 Draw a ray diagram to show incident ray, reflected ray, normal, angle of incidence,, ang
reflection; if the angle of incidence is 45°
Q.20 Define asexual reproduction. Describe two methods of asexual reproduction in animals
Q.21. Write the answers of the following questions -
* Define friction
* Is it a contact force or non-contact force?
* Why do we rub our hands in winter?
Q.22 Write short notes on the following.
(a) Cytoplasm
(b) Nucleus of a cell​

Answer 1

Explanation:

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.

Answer 2

Answer:

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.