Unit Test How do Organisms Reproduce | Class 10 Science

MG SCHOOL SCIENCE

UNIT TEST – 07

HOW DO ORGANISMS REPRODUCE?

Class 10 | Science | Biology

25 MARKS

Board Exam Preparation

Maximum Marks
25

Time Duration
50 Minutes

Total Questions
15

Student Name: __________________________

Class & Section: ____________ Roll No: __________

Date: __________________________

GENERAL INSTRUCTIONS

1. All questions are compulsory.
2. Read each question carefully.
3. Draw neat and labelled diagrams wherever required.
4. Use appropriate scientific terminology.
5. Marks are indicated against each question.

SECTION A – MULTIPLE CHOICE QUESTIONS (5 × 1 = 5 Marks)

1. Which method of reproduction is observed in Amoeba? 1 Mark

Budding Binary fission Fragmentation Spore formation

Correct answer: (B) Binary fission.

2. Which part of a flower produces pollen grains? 1 Mark

Stigma Ovary Anther Style

Correct answer: (C) Anther.

3. The fusion of male and female gametes is called: 1 Mark

Pollination Fertilisation Germination Fragmentation

Correct answer: (B) Fertilisation.

4. Which contraceptive method also helps prevent sexually transmitted infections? 1 Mark

Copper-T Oral pills Condoms Surgical methods

Correct answer: (C) Condoms.

5. Which of the following is the female reproductive part of a flower? 1 Mark

Stamen Pistil Anther Filament

Correct answer: (B) Pistil (carpel).

SECTION B – ONE MARK QUESTIONS (4 × 1 = 4 Marks)

6. Define pollination. 1 Mark

Pollination is the transfer of pollen grains from the anther to the stigma of a flower.

7. What is vegetative propagation? 1 Mark

Vegetative propagation is a type of asexual reproduction in which new plants develop from vegetative parts such as roots, stems or leaves.

8. Name the male reproductive organ of a flower. 1 Mark

Stamen.

9. What is fertilisation? 1 Mark

Fertilisation is the fusion of male and female gametes to form a zygote.

SECTION C – TWO MARK QUESTIONS (3 × 2 = 6 Marks)

10. Write two differences between sexual and asexual reproduction. 2 Marks

Sexual reproduction: Involves fusion of male and female gametes and usually involves two parents. It produces genetic variations.

Asexual reproduction: Involves a single parent and no fusion of gametes. Offspring are generally genetically similar to the parent.

11. What is the importance of DNA copying during reproduction? 2 Marks

1. DNA copying transfers hereditary information from parents to offspring.
2. Small variations during DNA copying contribute to genetic diversity, which is important for the survival and evolution of species.

12. Differentiate between self-pollination and cross-pollination. 2 Marks

Self-pollination: Pollen grains are transferred to the stigma of the same flower or another flower on the same plant.

Cross-pollination: Pollen grains are transferred from a flower on one plant to a flower on another plant of the same species.

SECTION D – THREE MARK QUESTIONS (2 × 3 = 6 Marks)

13. Explain the process of fertilisation in flowering plants. 3 Marks

1. After pollination, a pollen grain lands on the stigma and germinates.
2. A pollen tube grows through the style towards the ovary and enters an ovule.
3. The male gamete travels through the pollen tube and fuses with the egg cell to form a zygote. The zygote develops into an embryo.

14. Explain the functions of the following parts of the human male reproductive system: (a) Testes (b) Vas deferens (c) Prostate gland. 3 Marks

(a) Testes: Produce sperms and the hormone testosterone.

(b) Vas deferens: Transports sperms from the epididymis towards the urethra.

(c) Prostate gland: Adds fluid to semen, helping nourish and protect sperms and supporting their movement.

SECTION E – FOUR MARK QUESTION (1 × 4 = 4 Marks)

15. Draw a neat labelled diagram showing germination of a pollen grain and growth of the pollen tube through the style towards the ovule. Answer the following: 4 Marks

(a) Draw the germinating pollen grain and pollen tube. (2 Marks)

(b) Label stigma, style, pollen tube and ovule. (1 Mark)

(c) What is the function of the pollen tube? (1 Mark)

Draw your diagram in the space below:

Your browser does not support canvas.

Use your finger or mouse to draw and label the pollen germination diagram.

KEY ANSWERS:

(a) Draw a pollen grain germinating on the stigma with a pollen tube growing down through the style towards the ovary and ovule.

(b) Label:

• Stigma
• Style
• Pollen grain
• Pollen tube
• Ovary
• Ovule

(c) The pollen tube carries the male gametes from the pollen grain towards the ovule for fertilisation.

YOUR TEST RESULT

0 / 5

Automatic evaluation covers five MCQs (5 marks). Descriptive answers and the pollen tube diagram require teacher evaluation (20 marks).

COMPLETE KEY ANSWERS – TEACHER'S REFERENCE

SECTION A – MCQ ANSWERS
1. B – Binary fission
2. C – Anther
3. B – Fertilisation
4. C – Condoms
5. B – Pistil

SECTION B – ONE MARK ANSWERS

6. Pollination is the transfer of pollen grains from anther to stigma.
7. Vegetative propagation is reproduction through roots, stems or leaves.
8. Stamen.
9. Fusion of male and female gametes.

SECTION C – TWO MARK ANSWERS

10. Sexual reproduction involves gamete fusion and generally produces variations; asexual reproduction involves one parent without gamete fusion.
11. DNA copying transfers hereditary information and introduces variations that contribute to genetic diversity.
12. Self-pollination occurs within the same plant; cross-pollination occurs between different plants of the same species.

SECTION D – THREE MARK ANSWERS

13. Pollen grain germinates on the stigma, pollen tube grows through the style into the ovary, and male gamete travels to the ovule and fuses with the egg cell.
14. Testes produce sperms and testosterone; vas deferens transports sperms; prostate gland contributes fluid to semen.

SECTION E – FOUR MARK ANSWER

Germination of Pollen Grain and Growth of Pollen Tube – Labelled Diagram

Explanation:

1. Pollen grain lands on a compatible stigma and germinates.
2. A pollen tube grows through the style towards the ovary.
3. The male gametes travel through the pollen tube into the ovule.
4. One male gamete fuses with the egg cell during fertilisation.

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Class 10 Science – How Do Organisms Reproduce?