Case Study and Passage Based Questions for Class 12 Biology Chapter 1 Reproduction in Organisms

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Case Study/Passage Based Questions:

Question 1:

Given below is the diagram of a ginger rhizome. Answer the questions given below based on
the diagram.

(i) Why do vegetative propagules in sugarcane and ginger appear from the nodes?
(ii) Name the vegetative propagules in (a) Potato, and (b) Pistia.
(iii) How does potato multiply?

Answer Ans. (i) This is because the nodes have meristematic cells.
(ii) The vegetative propagules of potato is tuber and that of Pistia is offsets.
(iii) Potato multiplies by buds (eyes) of the tuber (vegetative propagation).

Question 2:

Study the diagram given below and answer the questions that follow:

(i) Name an alga that reproduces asexually through zoospores. Why are these reproductive units so called?
(ii) Mention a characteristic feature and a function of zoospores in some algae.
(iii) How does Penicillium reproduce asexually?

Answer Ans.
(i) Chlamydomonas reproduces through zoospores. The reproductive units are called zoospores because they are motile.
(ii) Zoospores are microscopic motile structures. These are special structures by which algae reproduce asexually.
(iii) Penicillium reproduces asexually by spore formation called conidia on conidiophores.

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