Q1. (a) A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1 progeny? (1)
(b) Write the energy conversion that takes place in a hydropower plant. (1)
(c) Why is variation important for a species? (1)
(d) Define transpiration. (1)
(e) What is phototropism? (1)
(f) Define vegetative propagation. (1)
(g) What are the chromosomes XY and XX known as ? (1)
(h) Name the hormone that regulates blood sugar level. (1)
(i)Mention the role of head in the sperm ? (1)
(j) Define vegetative propagation. (1)

Q2. (a) How many pairs of chromosomes do human beings have, specify the types of chromosomes also? (2)
(b) What is self and cross pollination? (2)
(c) How does mining cause pollution? (2)
(d) What are the products formed when coal and petroleum are burnt? (2)
(e) Draw the labelled diagram of the human digestive system. (2)
(f) How does phototropism occur in plants? (2)

Q3. (a) Give reasons for the following: (3)
(i) The glottis is guarded by epiglottis.
(ii) It is said to not speak while eating.
(iii) Walls of trachea are supported by cartilage rings.
(b) What are the various evidences in factors of evolution? (3)
(c) Draw well labelled diagram of a bisexual flower. (3)
(d) Describe the process and importance of double circulation in humans. (3)
(e) What is the need for a system of control and coordination in an organism? (3)
(f) State the role of the following (i) Chloroplasts (ii) Diaphragm (iii) Larynx (3)

Q4. (a) Define evolution. State Darwin’s theory of evolution. (5)
(b) State the functions of       a. Testes       b. Ovaries       c. Vas deferens       d. Stamen       e. Pistil (5)
(c) (i) Name the blood vessel that brings oxygenated blood to the human heart. (5)
(ii) Which chamber of human heart receives oxygenated blood?
(iii) Explain how oxygenated blood from this chamber is sent to all parts of the body.
(d)i. Compare and contrast nervous and hormonal mechanism for control and coordination in animals. (3)
ii.  Do Humans remain fertile throughout their life?  Comment.    (2)

Life Process NCERT Solutions for Class 10th SCIENCE