Railway Science (Biology-Reproduction in Plant) (Part-II)

Total Questions: 42

1. The seed of a plant contains the future plant in the form of a/an ___________. [RRB Group D 19/09/2018 (Afternoon)]

Correct Answer: (b) embryo
Solution:

After a fertilized adult plant flowers, the embryo develops and is usually encapsulated within a seed or bud. Parts of a Flower: Sepals - Small, leaf-shaped, green-coloured and outermost part of the flower.
Petals - Modified leaves that envelop a flower's reproductive organs. Stamen - The Male reproductive part of a flowering plant and Carpels - Consists of three parts: Stigma, Style and Ovary.

2. A plant that does NOT grow through vegetative propagation is ______ . [RRB Group D 20/09/2018 (Afternoon)]

Correct Answer: (b) Papaya
Solution:

Vegetative propagation - It is also called ‘Asexual propagation’. The vegetative parts of a plant like leaf, stem, root or their modified forms are used for propagation. Methods of Asexual Reproduction - Fission, Budding, Spore Formation, Regeneration, Fragmentation, Vegetative Reproduction.

3. The male reproductive parts of the flower are called ______ . [RRB Group D 20/09/2018 (Evening)]

Correct Answer: (b) stamens
Solution:

It is like a thin thread and has anthers on the top part. Which contains pollen. Its main function is to produce pollen. Parts of a Flower: Sepals - Small, leaf-shaped, green-coloured and outermost part of the flower. Petals - Modified leaves that envelop a flower's reproductive organs. Carpels - Consists of three parts: Stigma, Style and Ovary.

4. A __________ is a unisexual flower. [RRB Group D 22/09/2018 (Evening)]

Correct Answer: (d) Papaya
Solution:

Unisexual flower : The flower that has only male or female reproductive parts (either stamens or carpels are present). Example - Coconut flowers, Watermelon, Cucumber, Maize, White mulberry, Muskmelon, Castor bean, Marrow, Luffa, Snake gourd, Bitter gourd, Tapioca, Pumpkin, American holly, Birch, Pine. Bisexual flowers : Flowers which contain both the stamens and the pistil. Example - Rose, Hibiscus, Gulmohar, Mustard.

5. Natural vegetative propagation is NOT found in: [RRB Group D 23/09/2018 (Evening)]

Correct Answer: (a) Mustard
Solution:

Vegetative propagation refers to a form of asexual reproduction in plants. It involves the use of specialized structures. Example : Sweet potato and dahlia through root tubers; ginger and potato through rhizomes (a modified stem).

6. Reproductive parts of angiosperms are located in _______. [RRB Group D 25/09/2018 (Morning)]

Correct Answer: (a) Flower
Solution:

Flower is the reproductive organ of angiosperms. It contains structures such as the stamen (male reproductive organ) and pistil (female reproductive organ), which are involved in the production of gametes (pollen and ovules) and fertilization, leading to the formation of seeds and fruits.

7. Mendel obtained F2 descendants from F1 generation plants by the method of _____. [RRB Group D 26/09/2018 (Afternoon)]

Correct Answer: (c) self pollination
Solution:

Self pollination is the transfer of pollen grains from anther to the stigma of the same flower. Cross pollination is the transfer of pollen grains from anther of one flower to the stigma of another flower. Vegetative propagation is a form of asexual reproduction of a plant where a new plant grows from a fragment of the parent plant.

8. In the F1 generation, _________ characteristic is more dominant and can be seen clearly. [RRB Group D 27/09/2018 (Afternoon)]

Correct Answer: (a) effective
Solution:

only one of the parental traits was expressed in the F1 generation while at the F2 stage both the traits were expressed in the proportion 3 :1. The contrasting traits did not show any blending at either F1 or F2 stage.

9. The character which predominates and is clearly seen in F1 generation is_______. [RRB Group D 27/09/2018 (Evening)]

Correct Answer: (c) dominant
Solution:

The trait which is suppressed is called a recessive trait in F1 generation. Law of dominance - When parents with pure, contrasting traits are crossed together, only one form of trait appears in the next generation. Law of dominance is known as the first law of inheritance.
The trait expressed in the F2 generation is in the ratio of 3:1. Monohybrid cross - cross between two individuals that differ in only one observed trait. Dihybrid cross - cross between two individuals that differ in two observed traits.

10. How many types of fission are there? [RRB Group D 01/10/2018 (Morning)]

Correct Answer: (a) two types
Solution:

Two types of fission : binary fission and multiple fission. In unicellular organisms, fission is an asexual method of reproduction. An individual divides into two or more new individuals during fission.