Exam-style CBSE practice questions on Coordination in Plants (Control and Coordination). Try each one first, then reveal the correct answer and a step-by-step explanation. Free, from EduLevel — the AI teacher for CBSE.
Identify the plant hormone from the following options.
Think about the primary functions of hormones. Some regulate processes within animals, while others are crucial for plant growth and development.
Explanation: Cytokinin is a plant hormone that promotes cell division. Insulin, thyroxin, and oestrogen are hormones found in animals.
Identify the plant hormone that stimulates cell elongation on the side of the shoot that is shaded from light.
Think about how plants respond to external stimuli like light. This response is a key characteristic of plant growth.
Explanation: Auxins accumulate on the shaded side of the shoot, which promotes greater cell elongation on that side, causing the shoot to bend towards the light source.
The growth of pollen tubes towards the ovules is an instance of which type of movement?
Think about what environmental factor is essential for the growth and guidance of the pollen tube towards the ovule.
Explanation: This movement is a response to chemical signals released by the ovule, which is defined as chemotropism.
Which plant hormone is found in higher concentrations in areas of rapid cell division?
Think about the plant hormones that primarily promote cell division and growth. One of these is particularly known for its role in this process.
Explanation: Cytokinins are plant hormones that promote cell division and are found in high concentrations in areas like fruits and seeds where rapid cell growth occurs.
Identify the respective plant hormones that promote rapid cell division in seeds and cause the wilting of leaves.
Consider the primary functions of different plant hormones related to growth, development, and stress responses. One hormone is known for its role in cell division and differentiation, while another is associated with dormancy and wilting.
Explanation: Cytokinins promote cell division, which is crucial for seed development, while Abscisic acid is an inhibitory hormone that causes wilting and dormancy.
During seed germination, the root extends downwards while a small shoot grows upwards. What is the name given to this upward-growing shoot?
Think about the different parts of a young plant embryo and what develops from them after germination.
Explanation: The plumule is the part of a plant embryo that develops into the shoot system, which grows upwards. The radicle develops into the root system, which grows downwards.
Which of the following is a plant growth inhibitor hormone that is responsible for causing the wilting of leaves?
This plant hormone is associated with stress responses and dormancy in plants.
Explanation: Abscisic acid (ABA) is a stress hormone in plants that inhibits growth and causes the closure of stomata, which leads to water loss and subsequent wilting of leaves.
From the options provided, identify the plant hormone that promotes cell division.
Think about the plant hormones that are primarily involved in growth and development, specifically focusing on processes that increase the number of cells.
Explanation: Cytokinins are a class of plant hormones that are primarily responsible for promoting cell division (cytokinesis) in plant roots and shoots, leading to growth.
From the options provided, choose the correct statement regarding tropic movement in plants.
Think about what causes plants to bend or grow in a certain direction. Is it something external or internal?
Explanation: Tropic movements are directional growth responses of a plant to external stimuli like light, gravity, or water, making them growth-related movements.
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