List of top Science Questions on How Do Organisms Reproduce asked in CBSE Class X

The reasons for excessive generation of wastes are:
 (i) Use and throw policy. 
(ii) Increased availability of packaged food. 
(iii) Increased construction wastes. 
(iv) Non-sorting of dry and wet wastes

Assertion : Bacteria produced as a result of asexual reproduction would be similar. Reason (R): There would be only minor differences between the bacteria generated due to small inaccuracies in DNA replication.
Assertion : The peristaltic movements occur all along the gut. Reason (R): The lining of the gut has muscles that contract rhythmically to push the food in regulated manner.
Due to change in length and area of cross-section of a conductor, resistance of conductor changes while resistivity does not change. Why ?
Write the preparation of following compounds with balanced chemical equation :
Baking soda
Bleaching powder
Plaster of Paris
Name the substance oxidised and reduced in the following reaction: \( ZnO + C \longrightarrow Zn + CO \)
Categorise the following based on their nature: \( ZnO, Na_2O, CO_2 \)
Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings ?
Gamete carrying X chromosome from female parent.
Gamete carrying X chromosome from male parent.
Gamete carrying Y chromosome from male parent.

Identify the type of reproduction shown in the diagram given below: 

Give two methods used to grow rose and jasmine plants by vegetative propagation.
Give one example each of a unisexual flower and a bisexual flower. Mention the changes which a flower undergoes after fertilization.
Write one function each of the parts - (i) petals (ii) anther (iii) style and (iv) ovary of a bisexual flower.
What is asexual reproduction? Explain the process of budding in Hydra.
Name the method by which Amoeba and Leishmania reproduce. Write a major difference in the way they divide to produce new individuals.

Name the labelled parts A, B, C and D in the diagram given below.

Explain by giving one example each:
(1) Unisexual flowers
(2) Bisexual flowers
Name the parts in the human female reproductive system where the following functions take place:
(1) Maturation of eggs
(2) Fusion of the egg and the sperm
(3) Implantation of the zygote
Name the glands which add their secretions to the sperms. List two functions of these secretions.
The organism in which an outgrowth on the parent body develops into a new individual is :