Class 10 Exam > Class 10 Notes > Science Class 10 > Unit Test: How Do Organisms Reproduce?
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: Which part of a flower develops into a fruit after fertilization? (1 Mark)
a) Stamen
b) Stigma
c) Ovary
d) Ovule
Q2: Which of the following is NOT a function of the testes in humans 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: How does Plasmodium reproduce asexually? (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: In which part of the human female reproductive system does fertilization typically occur? (1 Mark)
Q5: Name the part of Bryophyllum where the buds are produced for vegetative propagation. (1 Mark)
Q6: Define binary fission and give one example of an organism that reproduces by this method. (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)
You can find the solutions of this Unit Test here: Unit Test (Solutions): How Do Organisms Reproduce?
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FAQs on Unit Test: How Do Organisms Reproduce? - Science Class 10
| 1. What are the two main types of reproduction in organisms? |  |
Ans. The two main types of reproduction in organisms are sexual reproduction and asexual reproduction. Sexual reproduction involves the combination of genetic material from two parents, resulting in offspring with genetic variation. Asexual reproduction, on the other hand, involves a single organism producing offspring that are genetically identical to itself.
| 2. How does sexual reproduction occur in animals? | |
Ans. In animals, sexual reproduction typically involves the fusion of male and female gametes, known as sperm and eggs, respectively. This process often occurs through mating, where the male deposits sperm into the female's reproductive tract, leading to fertilization. The fertilized egg then develops into an embryo, eventually growing into a new individual.
| 3. What are some examples of asexual reproduction in organisms? | |
Ans. Asexual reproduction can occur through various methods, including binary fission, budding, fragmentation, and vegetative propagation. For example, bacteria commonly reproduce by binary fission, where a single cell divides into two identical cells. Plants can reproduce asexually through vegetative propagation, where new plants grow from parts of the parent plant, such as runners or tubers.
| 4. Why is genetic variation important in sexual reproduction? | |
Ans. Genetic variation is crucial in sexual reproduction because it enhances a population's ability to adapt to changing environments and resist diseases. This variation arises from the combination of genes from two parents, leading to diverse traits among offspring. Such diversity increases the chances of survival and reproduction in fluctuating conditions.
| 5. Can organisms switch between asexual and sexual reproduction? | |
Ans. Yes, some organisms can switch between asexual and sexual reproduction depending on environmental conditions. For example, certain species of fungi and plants may reproduce asexually when conditions are favorable, but switch to sexual reproduction when under stress or when environmental conditions change, promoting genetic diversity.
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