Unit Test: How Do Organisms Reproduce? | Science Class 10 PDF Download

Time: 1 hour

M.M. 30

Attempt all questions.

• Question numbers 1 to 5 carry 1 mark each.
• Question numbers 6 to 8 carry 2 marks each.
• Question numbers 9 to 11 carry 3 marks each.
• Question number 12 & 13 carry 5 marks each.

Q1: Fruits are formed from the (1 Mark)
a) Stamen
b) Stigma
c) Ovary
d) Ovule

Q2: Which among the following is not the function of the testes at puberty? (1 Mark)
(i) Formation of germ cells
(ii) Secretion of testosterone
(iii) Development of placenta
(iv) Secretion of estrogen

a) (i) and(ii)
b) (ii) and(iii)
c) (iii) and(iv)
d) (i) and(iv)

Q3: What conclusion can be made about the division in plasmodium? (1 Mark)
a) The cyst repeatedly divides to form many daughter cells.
b) The cell divides multiple times giving rise to many daughter cells.
c) The nucleus repeatedly divides inside the cell to form new daughter cells.
d) The cyst enlarges in size and then bursts, producing many new daughter cells.

Q4: Fertilization begins in which part of humans? (1 Mark)

Q5: Name the part of Bryophyllum where the buds are produced for vegetative propagation. (1 Mark)

Q6: Define multiple fission. Give its one example. (2 Marks)

Q7: Name an organism which reproduces by spore formation. List three conditions favourable for spores to germinate and grow. (2 Marks)

Q8: Name the mode of reproduction of the following organisms and state the important feature of each mode: (2 Marks)
(i) Planaria
(ii) Hydra

Q9: “The chromosomal number of the sexually producing parents and their offspring is the same”. Justify this statement. (3 Marks)

Q10: State one genetically different feature between sperms and eggs of humans. What is its consequence? (3 Marks)

Q11: State the changes that take place in the uterus when: (3 Marks)
(a) Implantation of embryo has occurred.
(b) Female gamete/egg is not fertilised.

Q12: How do organisms, whether reproduced asexually or sexually maintain a constant chromosome number through several generations? Explain with the help of suitable example. (5 Marks)  

Q13: What is binary fission in organisms? With the help of suitable diagrams, describe the mode of reproduction in Amoeba. (5 Marks)