Class 10/Specimen Paper
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
BioNotesBioNotesCreated by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Online
ICSE Suggested Specimen Paper Based Preparation Guide
A gardener wants to create a bushier rose plant with many lateral branches. Should they remove the tip of the main stem or leave it intact? Explain your reasoning in terms of plant hormones.
Unripe bananas are often shipped in sealed containers. If a ripe banana is accidentally included in the shipment, all the other bananas will ripen very quickly. Which hormone is responsible for this, and what is its state of matter?
Odd One Out: Phototropism, Geotropism, Thigmotropism, Photosynthesis.
Scenario: A potted plant is placed horizontally in a dark room. After a few days, the shoot starts to bend upwards, and the root starts to bend downwards. Which tropism is being demonstrated, and how does the plant achieve this response in the absence of light?
Parthenocarpy in Agriculture
Parthenocarpy is the development of fruit without prior fertilization, which results in seedless fruits. This phenomenon can be induced artificially in many crop plants, such as grapes, watermelons, and cucumbers, by applying plant hormones. Auxins and gibberellins are commonly used for this purpose. By spraying these hormones on the flowers, farmers can trigger fruit development without the need for pollination and fertilization. This is commercially valuable because consumers often prefer seedless varieties of fruits. This case study is a prime example of how our understanding of plant hormones can be applied in horticulture and agriculture to modify plant development for human benefit.
Assertion (A): Abscisic acid (ABA) is known as the stress hormone. Reason (R): ABA promotes the closure of stomata during conditions of water scarcity.
(a) Both (A) and (R) are true and (R) is the correct explanation of (A). (b) Both (A) and (R) are true but (R) is not the correct explanation of (A). (c) (A) is true but (R) is false. (d) (A) is false but (R) is true.
Auxin and cytokinin have an antagonistic (opposing) relationship in controlling apical dominance. Based on this, predict what would happen if you applied a cytokinin-rich paste to a lateral bud of a plant whose apical bud is still intact. Justify your prediction.