Railway Science (Biology – Plant Kingdom) (Part-III)

Total Questions: 42

31. Which of the following statements is true? [RRB Group D 5/11/2018 (Evening)]

Statements:
A: Four types of elements together make up the xylem tissue.
B: The non-living cell of phloem is called the companion cell.

Correct Answer: (b) Only statement A is true, B is false
Solution:

Xylem: Tissue in plants transporting water & nutrients. Composed of tracheids, vessels, xylem parenchyma & xylem fibers. Sieve tube elements: Non-living cells with perforated walls, facilitating sugar flow. Companion cells: Living cells assisting in loading sugars into sieve elements.

32. _______ is a parasitic plant. [RRB Group D 16/11/2018 (Morning)]

Correct Answer: (d) Cuscuta
Solution:

Dodder (Cuscuta) known locally as Amarbel/Akashbel is a parasitic plant that lacks both chlorophyll and leaves. It is a yellow-colored climber that attaches itself to the host. It gives out haustoria or the suckers that get attached to the phloem of the host and derive nutrition.

33. The vegetative parts of a plant are ______. [RRB Group D 28/11/2018 (Morning)]

Correct Answer: (a) Roots, stems and leaves
Solution:

Vegetative parts include roots, stems, shoot buds and leaves. They are not directly involved in sexual reproduction. Vegetative parts often are used in asexual forms of reproduction. Examples include cuttings, budding or grafting.

34. In plants, Cytokinins ______. [RRB Group D 4/12/2018 (Afternoon)]

Correct Answer: (a) promote cell division
Solution:

Cytokinins are a group of plant growth regulator Hormones which are primarily involved in performing cell division in plant roots, shoot systems. It helps to produce new leaves, chloroplasts in leaves, lateral shoot growth and adventitious shoot formation.

35. Which of the following plants is included in the group of Bryophyta? [RRB Group D 4/12/2018 (Evening)]

Correct Answer: (c) riccia
Solution:

Riccia is a genus of liverworts, which are non-vascular plants belonging to the division Bryophyta. The main plant body of a bryophyte is gamete-producing and is called a gametophyte.
It bears the male sex organs called antheridia and female sex organs called archegonia. The male and female gametes produced fuse to form zygote which produces a multicellular body called a sporophyte

36. The epidermis of desert plants has a thick waxy layer of ______. [RRB Group D 05/12/2018 (Morning)]

Correct Answer: (b) cutin
Solution:

Cutin is present in desert plants to prevent excessive loss of water during transpiration. Due to this, plants can survive in scarcity of water in deserts. Pectin is a soluble fiber (polysaccharide) found in fruits. Cellulose is the most abundant extracellular structural polysaccharide found in plants.

37. What are the tissues that help in transportation of materials in trees called? [RRB Group D 06/12/2018 (Evening)]

Correct Answer: (b) vascular tissue
Solution:

Plants have pipe-like vessels to transport water and nutrients from the soil. The vascular tissue for the transport of water and nutrients in the plant is called the xylem. The food has to be transported to all parts of the plant by the vascular tissue called the phloem.

38. The movement of a part of a plant towards the stimulus of gravity is called______ [RRB Group D 11/12/2018 (Morning)]

Correct Answer: (a) Gravitropism
Solution:

Phototropism: The growth of a plant in response to light. Hydrotropism: The growth of a plant in response to water. Chemotropism: The growth of a plant in response to a chemical stimulus.

39. Fill in the blank with the most appropriate option. [RRB ALP Tier - I (09/08/2018) Morning]

Plants that do not have a differentiated plant body belong to the group ______

Correct Answer: (d) Thallophyta
Solution:

Thallophyta is a division of non-vascular plants, which includes algae, fungi, and lichens. Pteridophytes have differentiated plant bodies. They are characterized by having a thallus, or undifferentiated body, instead of distinct leaves, stems, and roots.
Phanerogams: Seed producing plants. Bryophytes (land plants): A group of plant species that reproduce via spores rather than flowers or seeds. Types: Mosses, hornworts, and liverworts.

40. In which of the flowering plants are buds produced in the notches along the leaf margin? [RRB ALP Tier - I (10/08/2018)Morning]

Correct Answer: (c) Bryophyllum
Solution:

Bryophyllum - It is a genus of plant species in the Crassulaceae family native to Madagascar. Bryophyta is a phylum of Plant kingdom in which the most simple and primitive land plants are included.
The plants are devoid of vascular tissues. Some of the plants included in this phylum are Riccia, Anthoceros, Funaria, and Sphagnum, etc. Rose is an ornamental flowering plant that propagates by stem cutting.