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Reproduction In Organisms - Important Questions Model Paper 1 In 12th Biology

Published on: 27/07/2018

Based on the chapter Reproduction in Organisms, some of the important questions are covered in this question paper. The questions are prepared from the book back and the creative questions.
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chapter: - Model Question paper

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Questions:

Multiple Choice Question

10 x 1 = 10

Banana is vegetatively propagated by

(a)

tubers

(b)

rhizomes

(c)

bulbs

(d)

suckers

Which part would be most suitable for raising virus-free plants for micropropagation?

(a)

Bark

(b)

Vascular tissue

(c)

Meristem

(d)

Node

What is common between vegetative reproduction and apomixis?

(a)

both are applicable to only dicot plants

(b)

both bypass the flowering phase

(c)

both occur round the year

(d)

both produce progeny identical to the parent

The number of chromosomes in the shoot tip cells of a maize plant is 20. The number of chromosomes in the microscope mother cell of the same plant shall be:

(a)

(b)

(c)

(d)

Choose the correct statement from amongst the following:

(a)

Dioecious (hermaphrodite) organisms are seen only in animals.

(b)

Dioecious organisms are seen only in plants

(c)

Dioecious organisms are seen in both plants and animals

(d)

Dioecious organisms are seen only in vertebrates

vegitative propagation in mint occurs by

(a)

Offset

(b)

Rhizome

(c)

Sucker

(d)

Runner

Which of the following animal is having longitudinal binary fission?

(a)

Euglena

(b)

Plasmodium

(c)

Planaria

(d)

Paramecium

(e)

Hydra

Which of the following statements true of date plam?

(a)

It is monoecious producing both staminate flowers and pistilate flowers in the same plant.

(b)

It is monoecious producing staminate flowers in one tree and pistillate flowers in another tree.

(c)

It is dioecious producing staminate flowers in one tree and pistillate flowers in another tree.

Which of the following statements is true of ginger?

(a)

Germinating bud appears from the eye of the stem tuber.

(b)

Germinating bud appears from the node of the rhizome

(c)

Germinating bud appears from the notch of the leaf margin.

10.

Which of the following statements is true of yeast?

(a)

The cell divides by binary fission. One of them develops into a bud.

(b)

The cell divides unequally. The smaller cell develops into a bud.

(c)

The cell produces conidia, which develop into a bud.

1 Marks

8 x 1 = 8

11.

Give a reason for the following:
i)The animals exhibiting external fertilization discharge large number of gametes.
ii)Marchantia is a dioecious plant.

12.

Meiosis generally occurs during gametogenesis in sexually reproducing organisms.Why?

13.

What is regeneration?

14.

What is double fertilization?

15.

What is homogamy ?

16.

Name the parts of the gynoecium which develop into fruit and seeds.

17.

Cut pieces of a Bryophyllum leaf when put into wet soil produce new plants. How?

18.

Why is a coconut plant reffered to as monoecious?

Generic 2

1 x 2 = 2

19.

In haploid organism that undergo sexual reproduction, name the stage in the life cycle when meiosis occurs. Give reasons for your answer.

Generic 5

2 x 5 = 10

20.

Jagan has two mango trees in the backyard of his house, which yielded fruits for the first time during this summer. The fruits were small, fibrous and not so sweet. In the next house, where his friend Ajay livers, there is a mango tree, which yields fruits that are fleshy/juicy, very sweet and bigger in size. Ajay, a student of B.sc. (Botany) comes out with an idea and takes some branches from the jagan's garden to his garden and explains the procedure.
(a) What method do you think Ajay has suggested for getting good quality fruits, on the trees of Jagan's house in a short period of time, i.e. during the next season?
(b) Describe how it is carried out to help japan.
(c) What are its advantages over growing a mango tree with the seeds obtained from Ajay's garden?
(d) Mention the values expressed by Ajay in this case.

21.

You must have seen your mother adding 3-4 globules of yeast to the idli paste she has prepared. Similarly, brewing industry uses yeast in the manufacture of alcohol.
(a) How does such a small amount of yeast added help to produce thousands of litres of alcohol? Explain how yeast multiples so fast.
(b) Name the process carried out by yeast in these cases.
(c) What value is learnt from these?

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Answers Key:

Multiple Choice Question

10 x 1 = 10

(b)
rhizomes

(d)
both produce progeny identical to the parent

(a)
20

(a)
Euglena

(b)
Germinating bud appears from the node of the rhizome

10.

(b)
The cell divides unequally. The smaller cell develops into a bud.

1 Marks

8 x 1 = 8

11.

()
i) The organism exhibiting external fertilization discharge a large number of gametes into the water to increase the chances of fertilization.
ii)In Marchantia, male and female reproductive organs are present in separate individuals.Such type of plants is called dioecious plants.

12.

()
Gametogenesis in sexually reproducing organisms generally involves meiosis in order to produce haploid gametes in normally diploid organisms.

13.

()
The capacity for generating entire new individual from a fragment is called regeneration.

14.

()
Double fertilization first discovered by S.G.Nawaschin involves union of egg and one of male nuclei and fusion of second male nucleus with the polar nuclei. This called double fertilization.

15.

()
It is the process of simultaneous ripening of anthors and stigma of a bisexual flower.

16.

()
Ovary develops into fruit; ovules develop into seeds.

17.

()
Adventitious buds arise from the notclies present along the margin in the leaves of Bryophyllum; each bud grows into a new plant when put into wet soil.

18.

()
Both male and female flowers are produced on the same plant in coconut; hence it is monoecious.

Generic 2

1 x 2 = 2

19.

1. In haploid organisms, meiosis occurs during development of zygote.
2. It is the only diploid stage (formed by the fusion of two haploid gametes) in the life-cycle that can undergo miosis.

Generic 5

2 x 5 = 10

20.

(a) Grafting a branch from the tree of Ajay's house on a tree of Jagan's garden can be done.
(b) The part of the graft that forms the upper part is called scion and the part of the graft that becomes the supporting portion (the root and base), is called stock.
(i) The scion is selected from a superior quality plant (juicy, larger mango fruits) while the stock belongs to the plant to be improved.
(ii) The scion and stock should be of same diameter and slant cuts are made on both the branches.
(iii) The scion is kept on the stock, covered with grafting clay and polythene; it is tied well and arrangement of water supply/ moisturising is made.
(iv) After a few weeks, you will see buds and leaves appearing on scion.
(c)The mango tree will start producing flowers and fruits very early, may be in the next season itself. - Many branches can be grafted on the tree with poor quality mangoes.
(i) When grown from a seed it takes many years for the tree to produce fruits. - Sometimes the plant produced from the seed may not be of the same quality, as sexual reproduction results in variation.
(d) Values for friendship and generosity.

21.

(a) Yeast multiplies by budding very fast In yeast, the cell division is unequal and results in a large cell and a small cell, called bud which remains attached to the large cell; the bud gets separated and grows into an adult yeast.
The yeast cells secrete enzymes to produce alcohol.
(b) It carries out the process of fermentation.
(c) Mother shows how to make use of the natural processes and to live with nature and to appreciated how such microbes are useful to us; try to help others.