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Class 10 Science Chapter 7: How do Organisms Reproduce? MCQs with answers

10 multiple-choice questions on How do Organisms Reproduce?, each with its answer and the reason, written from the NCERT chapter. Open a question's solution to check your working; then take the free test to find your next chapter.

Question 1
A student watches several Amoeba cells dividing on a slide and notes that the line along which each cell splits points a different way every time. This shows that in Amoeba
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Answer: (d) division can take place in any plane

In Amoeba the splitting of the two cells during division can take place in any plane, so the line of splitting varies from cell to cell.

Question 2
In a sample from a kala-azar patient, every dividing parasite is seen to split in the same fixed direction. The reason is that the parasite
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Answer: (c) has a whip-like structure at one end, and its fission occurs in a definite orientation to it

Leishmania, which causes kala-azar, has a whip-like structure at one end, and its binary fission occurs in a definite orientation in relation to that structure.

Question 3
A blood smear from a patient with malaria shows one parasite cell that has divided into many small daughter cells at the same time. This process is
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Answer: (b) multiple fission

The malarial parasite Plasmodium divides into many daughter cells simultaneously, which is multiple fission.

Question 4
A slice of bread left in a damp kitchen shows a white cottony growth with tiny black blobs on thin stalks. The spores of this mould are held in the
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Answer: (d) blobs on stalks, the sporangia

In Rhizopus the hyphae are not reproductive parts; the blob-on-a-stick structures are sporangia, which contain the spores.

Question 5
Mould spores settle on a dry biscuit and on a moist piece of chapati. The spores on the biscuit stay alive but do not grow because
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Answer: (b) their thick walls protect them until they meet a moist surface

Spores are covered by thick walls that protect them until they come into contact with another moist surface, where they can begin to grow.

Question 6
A gardener lays a fleshy Bryophyllum leaf on moist soil. A few weeks later small plants appear. They grew from
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Answer: (a) buds in the notches along the leaf margin

Buds produced in the notches along the leaf margin of Bryophyllum fall on the soil and develop into new plants.

Question 7
A nursery cannot raise one of these plants from seed, because it has lost the capacity to produce seeds. Which one?
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Answer: (d) Jasmine

Jasmine, like banana, orange and rose, has lost the capacity to produce seeds and is propagated vegetatively. Mustard, papaya and watermelon all form flowers that give seeds.

Question 8
In a plant laboratory, cells taken from the growing tip of a plant are placed in an artificial medium, where they divide rapidly. The undifferentiated mass they form is called a
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Answer: (a) callus

In tissue culture the cells from the growing tip divide rapidly in the artificial medium to form a callus.

Question 9
A flower grower wants thousands of disease-free plants of one prized ornamental variety, all from a single parent plant. The method best suited is
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Answer: (c) tissue culture

Tissue culture lets many plants be grown from one parent in disease-free conditions, and it is commonly used for ornamental plants.

Question 10
In a school laboratory a Planaria is cut into three pieces and kept in clean pond water. After some days the class would most likely find
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Answer: (b) three complete Planaria

Planaria can be cut into any number of pieces and each piece grows into a complete organism; this is regeneration.

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