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CBSE Questions for Class 6 Biology Getting To Know Plants Quiz 4 - MCQExams.com
CBSE
Class 6 Biology
Getting To Know Plants
Quiz 4
Which of the following plants have thick hard stems and are very tall?
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Lemon
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Tomato
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Mango
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All of the above
Explanation
Mango grows on trees which are very tall and have thick hard stems.
Tomoto plants are herbs whereas lemon plants are shrubs.
Hence the correct option is C.
When a stem bearing leaves is kept in a coloured solution, only the stem becomes coloured and not leaves.
Is the above statement true or false?
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True
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False
Explanation
Water moves up the stem and reaches the leaves. Hence both the stem and leaves gradually attain the colour of the solution.
Thus the given statement is false.
In the laboratory teacher asked the students to place the stem in a glass containing coloured solution. What do the students observe?
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The stem and leaves become coloured
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Only the stem becomes coloured
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Only the leaves become coloured
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Both stem and leaves do not attain the colour
Explanation
When the stem is dipped in the coloured solution, water gradually moves up the stem and reaches the leaves. Hence both the stem and leaves become coloured.
Thus the correct option is A.
If not for stems, water will not be able to reach the leaves.
Is the above statement true or false.
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True
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False
Explanation
The given statement is true. The stem is essential for the upward movement of water from the root to the leaves.
What is the function of the stem?
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Upward transport of water
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Downward transport of water
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Both A and B
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None of the above
Explanation
Stem helps in the upward transport of water.Water absorbed by the roots move up the stem and reaches the leaves.
Hence the correct option is A.
Stem helps in the upward transport of water.
Is the given statement true or false?
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True
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False
Explanation
Water that is absorbed by the roots moves up the stem and reaches the leaves.
Hence the given statement is true.
Veins are associated with which part of the plant?
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Stems
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Roots
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Leaves
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Flower
Explanation
Veins are present in the leaves of plant and water reaches the leaves via the veins.
Hence the correct option is C.
Stem is not involved in the transport of water.
Is the above statement true or false?
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True
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False
Explanation
Stem plays an important role in the upward transport of water from the roots to the leaves.
Hence the given statement is false.
Choose the correct answers from the alternatives given.
Cortex is found in
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Stems only
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Roots only
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Roots and stems
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Roots, stems, and leaves
Explanation
The cortex is the outermost layer of the stem or root of a plant, bounded on the outside by the epidermis and on the inside by the endodermis. In plants, it is composed mostly of differentiated cells, usually large thin-walled parenchyma cells of the ground tissue system.
Hence, the correct answer is 'Roots and stems'.
Bamboo is
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Culm
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Bulb
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Runner
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Twiner
Explanation
$$\textbf{Correct Option A}$$
$$\textbf{Solution}$$
$$\bullet$$ $$\textbf{Option A}$$ Culm is referred to the stem which is joined with the nodes and internodes. The nodes are solid while the internodes are hollow. One of the example is bamboo.
$$\bullet$$ $$\textbf{Option B}$$
Bulb is referred to the stem which have structure that surrounds it having scaly leaves which have food stored in them. Some examples are onion and garlic.
$$\bullet$$ $$\textbf{Option C}$$
Runner is referred to a stem which spreads on the soil roots are developed to the download direction and the leaves towards the opposite direction of the node. Some examples are oxalis.
$$\bullet$$ $$\textbf{Option D}$$
Twiners are the stems which two winds around with the help of a support without any structural arrangement and attachment. Ex:- Cuscuta.
So, the correct option is A.
Which of the following lists all the ingredients and products of photosynthesis?
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Carbon dioxide, water, oxygen and carbohydrate
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Phosphorus, nitrogen, water, carbon dioxide and oxygen
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Carbohydrates, water, nitrogen and carbon dioxide
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Carbon dioxide, water, ozone and carbohydrates.
Explanation
$$\textbf{Concept applied:}$$ Photosynthesis is the process by which plants convert light energy into chemical energy stores in the form of carbohydrates.
$$\textbf{Correct option:}$$ Option A
$$\textbf{Explanation for correct option:}$$
Option A
$$\bullet$$ Photosynthesis helps plants produce food in the form of carbohydrates.
$$\bullet$$ Plants utilize carbon dioxide and water in presence of light energy and pigments like chlorophyll, to produce
carbohydrates (stored in plants as starch)
and release oxygen in the process.
$$\textbf{Explanation for incorrect options:}$$
Option B:
To produce carbohydrates by the process of photosynthesis, phosphorus and nitrogen are not required.
Option C:
During photosynthesis, carbon dioxide is used and oxygen is evolved with the production of carbohydrates. Nitrogen is neither required nor evolved during photosynthesis.
Option D:
During photosynthesis, oxygen is evolved in the molecular form O$$_2$$ and not in the form O$$_3$$ known as ozone.
$$\textbf{Conclusion:}$$ Photosynthesis requires carbon dioxide and water to produce carbohydrates and evolve oxygen.
The function of root cap is __________.
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Protection of root tip and control of geotropic movement
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Storage of food products
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Absorption of nutrients
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All of the above
Explanation
The function of the root cap is to protect the root tip and control geotropic movement. The root cap is a section of tissue at the tip of a plant root. It is also called calyptra.
Root caps contain statocytes which help in gravity perception in plants. The root cap is also involved in the protection of the growing tip in plants. It secretes mucilage to ease the movement of the root through the soil and may also be involved in communication with the soil microbiota.
Thus, the correct answer is option A.
Plants sense gravity with the help of
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Phytochromes
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Statoliths
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Phytohormones
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Abscisic acid
Explanation
In the root cap there is a special subset of cells, called as statocytes. Inside the statocyst cells, some specialized amyloplasts are involved in the perception of gravity by the plant (gravitropism). Statoliths settle at the bottom part of their cells and allow plants to sense gravity. Statoliths are also found in the endodermal layer of the inflorescence stem. The redistribution of auxin causes the shoot to turn in a direction opposite that of the gravity stimuli.
So, the correct answer is '
Statoliths'.
Main component of middle lamella is?
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Magnesium pectate
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Calcium pectate
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Calcium carbonate
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Calcium oxalate
Explanation
The middle lamella is a pectin layer which cements the cell walls of two adjoining plant cells together. It is the first formed layer which is deposited at the time of cytokinesis. The cell plate that is formed during cell division itself develops into middle lamella or lamellum. In plants, the pectins form a unified and continuous layer between adjacent cells. Frequently, it is difficult to distinguish the middle lamella from the primary wall, especially in cells that develop thick secondary walls. The middle lamella is made up of calcium and magnesium pectates.
So the correct option is 'Mg pectate'.
In which of the following organs, growth is subapical?
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Shoot
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Petiole
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Root
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Pedicel
Explanation
Roots grow in length only from the ends. The tip of the root is covered by a root cap, which gives protection to the growing tip as it makes its way through the soil. The root has a subapical region, which is divided into three zones. They are, the zone of cell division, the zone of elongation and the zone of cell maturation. The subapical region carries out the growth of the roots.
Hence, the correct answer is option C.
Primary root is very short lived and is replaced by a large number of thread like roots in
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Mango
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Maize
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Pea
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Beans
Explanation
Correct option-C
Explanation for correct option-C
Plants have two types of root systems - tap root system and fibrous root
.
In monocotyledonous plants
, the primary root is short-lived and is replaced by a large number of thread-like roots called fibrous roots.
Maize is a monocot.
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