With reference to asexual reproduction in simple organisms, consider the following statements: 1. Yeast reproduces by a process called fragmentation. 2. Algae multiply rapidly by fragmentation when water and nutrients are available. 3. A yeast cell reproduces primarily through the formation of spores. Which of the statements given above is/are correct?

The correct option is (b) 2 only. Explanation Asexual reproduction involves the production of new individuals from a single parent without the involvement of gamete fusion. Different simple organisms utilize specific mechanisms such as budding, fragmentation, and spore formation based on their cellular structure. - Statement 1 is Incorrect: Yeast is a unicellular organism that reproduces primarily through a process called budding. During this process, a small bulb-like projection (bud) emerges from the parent cell, grows, and eventually detaches to form a new independent cell. Fragmentation is typically observed in multicellular organisms with simple body designs. - Statement 2 is Correct: Algae, such as Spirogyra, reproduce by fragmentation. When environmental conditions are favorable (abundant water and nutrients), the algae grow rapidly and break into two or more fragments. Each fragment subsequently grows into a new individual. - Statement 3 is Incorrect: The primary mode of asexual reproduction in yeast is budding, not spore formation. Spore formation is the characteristic method of asexual reproduction in fungi like bread mould (Rhizopus) and lower plants like mosses and ferns. While yeast may form spores under specific stress conditions or during sexual reproduction, budding is the standard asexual method. Key Takeaway: Yeast reproduces via budding, whereas filamentous algae (like Spirogyra) reproduce via fragmentation. Spore formation is the primary asexual method for bread mould.

With reference to asexual reproduction in… - NCERT Class 7 Science MCQ

NCERT Class 7 Science — Chapter 4: Reproduction in plants

mcqmedium

With reference to asexual reproduction in simple organisms, consider the following statements:

Yeast reproduces by a process called fragmentation.
Algae multiply rapidly by fragmentation when water and nutrients are available.
A yeast cell reproduces primarily through the formation of spores.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 7 · Page 3

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (b) 2 only.

Explanation

Asexual reproduction involves the production of new individuals from a single parent without the involvement of gamete fusion. Different simple organisms utilize specific mechanisms such as budding, fragmentation, and spore formation based on their cellular structure.

Statement 1 is Incorrect: Yeast is a unicellular organism that reproduces primarily through a process called budding. During this process, a small bulb-like projection (bud) emerges from the parent cell, grows, and eventually detaches to form a new independent cell. Fragmentation is typically observed in multicellular organisms with simple body designs.
Statement 2 is Correct: Algae, such as Spirogyra, reproduce by fragmentation. When environmental conditions are favorable (abundant water and nutrients), the algae grow rapidly and break into two or more fragments. Each fragment subsequently grows into a new individual.
Statement 3 is Incorrect: The primary mode of asexual reproduction in yeast is budding, not spore formation. Spore formation is the characteristic method of asexual reproduction in fungi like bread mould (Rhizopus) and lower plants like mosses and ferns. While yeast may form spores under specific stress conditions or during sexual reproduction, budding is the standard asexual method.

Key Takeaway: Yeast reproduces via budding, whereas filamentous algae (like Spirogyra) reproduce via fragmentation. Spore formation is the primary asexual method for bread mould.

Your note

More from Chapter 4: Reproduction in plants

Which of the following is a correct match of the plant and its vegetative part used for reproduction?

easy

Consider the following statements regarding the "eyes" of a potato and the "buds" of Bryophyllum: 1. Only potato eyes are vegetative structures, while Bryophyllum buds are reproductive. 2. Potato eyes are located on the stem, while Bryophyllum buds are on the leaf. 3. Both require burial in soil to germinate. Which of the statements given above is/are correct?

medium

Which of the following sets of plants produces unisexual flowers?

medium

In a flowering plant, where is the female gamete located prior to fertilisation?

easy

With reference to the agents of pollination, consider the following statements: 1. Pollen grains carried by wind are usually light and dry. 2. Insects generally avoid flowers and do not carry pollen. 3. Water can act as an agent for carrying pollen grains. Which of the statements given above is/are correct?

medium

Keep practising Chapter 4: Reproduction in plants

Work through every question from this NCERT chapter.

Browse all NCERT Class 7 Science chapters