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CBSE Questions for Class 6 Biology Getting To Know Plants Quiz 3 - MCQExams.com
CBSE
Class 6 Biology
Getting To Know Plants
Quiz 3
Swollen root of Radish is made of two parts.
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Stem and epicotyl
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Primary root and hypocotyl
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Primary root and epicotyl
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Secondary root and primary root
Explanation
B. Primary root and hypocotyl
Reason: The Swollen root of the radish is made up of a long fleshy tap root and a very short fleshy hypocotyl. Very thin secondary roots are found on the surface but they are not swollen.
The substance not essential for photosynthesis is?
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Sunlight
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Chlorophyll
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Nitrogen
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Carbon dioxide
Explanation
Correct Option-
C
Explanation -
Photosynthesis is an anabolic process in which the green plants convert light energy to chemical energy and produce nutrients in the form of carbohydrates.
Green plants utilize solar energy to synthesize nutrients from carbon dioxide and water from the atmosphere with the help of chlorophyll pigment.
Thus, nitrogen doesn't play any significant role during the process of photosynthesis. Hence, the correct option is
Nitrogen
.
Which one of these is not a part of a leaf?
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Midrib
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Lamina
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Leaf base
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Stamen
Explanation
A) The midrib
is the central vein in the middle of
the leaf
.
B) The lamina
is the broad green part of the leaf in which photosynthesis takes place.
C) Leaf base is the
lowermost
part of
the leaf
from where it attaches to the stem or branch.
D) Stamen is the male reproductive part present in
a flower
. It is not a part of a leaf.
So, the correct option is 'Stamen'.
The given table shows some characteristics of herbs, shrubs and trees. Which of the given points is/are incorrect?
Features
Herbs
Shrubs
Trees
(i)
Size
Very small, usually less than 1 m high
Medium sized, usually 1.3 m high
Tall, generally more than 3 m high
(ii)
Nature of stem
Green and tender stem s with few brandies
Hard and very thick stem with branches on the upper part of the stem
Hard stem but not very thick; branches arise near the base of the stem
(iii)
Examples
Grass, tomato, wheat, mint
Hibiscus, lemon, rose. jasmine
Gu I moh a r, neem, peeps!, mango
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(i) only
0%
(ii) only
0%
(iii) only
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(ii) and (iii) only
Explanation
The stem of hats is green and tender and has few branches. Shrubs have hard woody stems which are not very thick and the branches arise near the base of the stem. Trees, on the other hand, have hard and thick stems and the branches arise on the upper part of the stem.
Which of the following is called the female reproductive part of a flower?
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Stamen
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Petals
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Sepals
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Carpel
Explanation
$$\textbf{Correct option:D}$$
$$\textbf{Solution:}$$
$$\textbf{Option (A):}$$
$$\bullet$$Stamen is a male reproductive organ and an essential organ
$$\bullet$$It consists of two parts that are anther and filament.
$$\textbf{Option (B):}$$
$$\bullet$$Petals are accessory organs of a flower that are colorful and attract insects for pollination.
$$\textbf{Option (C):}$$
$$\bullet$$Sepals
are accessory organs of a flower
that are mostly green in color.
$$\textbf{Option (D):}$$
$$\bullet$$Carpel or pistil is a female reproductive organ that consists of stigma, style, and ovary.
Which of the following pairs is/are correct?
(A) Main root - Storage
(B) Lateral root - Absorption
(C) Root hair - Conduction
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All are correct
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A and B
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Only A
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None of these
Explanation
The region of cell differentiation or maturation is differentiated into root hairs. Most of the water absorption occurs through this region.
The roots are modified to form storage roots such as conical, fusiform, napiform, tuberous
Lateral roots extend horizontally from the primary root and this contributes to water uptake and nutrient uptake.
So, the correct option is 'A and B'
Edible roots are found in:
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Rice
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Wheat
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Potato
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Sweet potato
Explanation
The edible part of the sweet potato plant is a modified fleshy root. Due to the storage of food, the root of the plant of the sweet potato becomes thick and fleshly.
So, the correct answer is option D.
..........
are found in wheat.
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Respiratory roots
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Fasciculate roots
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Fibrous roots
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Tap roots
Explanation
Respiratory roots are non-photosynthetic and non-green in nature. They are seen in plants growing in marshy regions and in aquatic plants. They are found in wheat. They are also called as breathing roots. Fasciculated roots are modified adventitious roots. They are arranged in fascicles.
Thus, the correct answer is 'Respiratory roots.'
The part of a flower that bears ovules:
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Carpel
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Stamen
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Petal
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Sepal
Explanation
Carpel is a female reproductive organ of a flower, consisting of a stigma, style, and ovary.
It may appear single or as a part of a group.
The ovary constitutes ovules, which develop into seeds upon fertilization.
So, the correct answer is option 'A'.
Ginger is a stem and not a root because?
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It stores food
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It lacks chlorophyll
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It has nodes and internodes
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None of the above
Which of the following terms constitute the female part of the flower?
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Sepals, petal and stamen
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Stigma, style and ovary
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Ovary, stamen and stigma
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Ovary, style and stamen
Explanation
The stigma receives the pollen grain, the pollen tube passes through the style and the ovary is where seeds are formed.
So, t
he correct option is B.
Which part of the plant shows negative phototropism?
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$$Root$$
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$$Stem$$
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$$Branch$$
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$$Leaf$$
Explanation
A. Root
R
eason: Negative phototropism is growth away from light. So roots bend away from the light source and show negative phototropism.
Endomycorrhizae forms ........ inside the roots.
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root tuber
0%
mantle
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root hair
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vesicle
Which stain do you use to observe onion root cells ?
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Safranin
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Acetocarmine
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Iodine
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Methylene blue
Explanation
B. Acetocarmine
EXPLANATION: Acetocarmine is a non-specific nuclear stain. It is a saturated solution of carmine in 45% acetic acid. This stain is used for microscopic studies to enhance the contrast of specific biological components in a sample. Acetocarmine is especially used to stain chromosomes apart from the cytoplasm and also used to visualize chromosomes in mitotic studies. This is a dye obtained from insects.
Which of the following is a characteristic of shrubs?
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Green tender stems
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Branches towards the base of the stem
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Thick stems
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No branches
Explanation
Shrubs are average sized plants that have hard but thin stems and branches near the base of the stem. Herbs have green slender stems and no branches.
Hence the correct option is B.
Herbs have green tender stems and several branches.
Is the above statement true or false?
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True
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False
Explanation
Herbs are very short plants. They have green tender stems. However they usually do not possess branches.
Hence the given statement is false.
Plants with weak stems and which crawl on the ground are
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Creepers
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Herbs
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Climbers
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None of these
Explanation
Creepers are plants with weak stems and which are found crawling on the ground. Climbers also have weak stems but they climb up on a support. Herbs have green tender stems that grow upright,
Hence the correct option is A.
Plants that do not possess branches are
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Herbs
0%
Shrubs
0%
Trees
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None of these
Explanation
Herbs are very short plants with green tender stems. They usually do not possess branches.
Hence the correct option is A.
Plants which have branches near the base of the stem are ______________.
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Herbs
0%
Shrubs
0%
Trees
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None of these
Explanation
Shrubs are average sized plants. They have a hard but thin stem. They possess branches but these are towards the base of the stem.
Hence the correct option is B.
Green tender stems are characteristic of
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Herbs
0%
Shrubs
0%
Trees
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None of these
Explanation
Herbs are very short plants with green tender stems and no branches. Stems have hard but thin stems while trees have hard and thick stems.
Hence the correct option is A.
Plants that have branches in the upper part and away from the ground are ____________.
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Herbs
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Shrubs
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Trees
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Grasses
Explanation
Trees are very tall plants with long, hard and thick stems. They have branches which are at the upper part of the stem and much raised from the ground.
Hence the correct option is C.
All plants have green leaves.
Is the above statement true or false.
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True
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False
Explanation
Not all plants have green leaves. There are plants with leaves of other colours including red coloured leaves.
Hence the given statement is false.
When a stem is placed in a coloured solution, it gradually becomes coloured from the bottom to top. What does it show?
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Stem has no chlorophyll
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Water gradually moves up the stem
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Stem is freely permeable
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None of these
Explanation
The experimental shows that stem helps in the upward conduction of water.
Hence the correct option is B.
Creepers and climbers are plants that cannot stand upright.
Is the above statement true or false.
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True
0%
False
Explanation
Creepers and climbers have weak stems and hence cannot stand upright. While creepers are distributed on the ground, climbers climb up on a support.
Hence the given statement is true.
Tomato grows on tall trees.
Is the above statement true or false?
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True
0%
False
Explanation
Tomato plants are herbs. They are short with green tender stems.
Hence the given statement is false.
Plants which grow on a support are called __________.
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Creepers
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Climbers
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Shrubs
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Tree
Explanation
Plants with weak stems that cannot stand upright but spread on the ground are called creepers, while those that take support and climb up are called climbers.
Hence the correct option is B.
Stem helps in the downward movement of water.
Is the above statement true or false?
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True
0%
False
Explanation
Water that is absorbed by the root moves up the stem and reaches the leaves. Hence stems are involved in the upward movement of water.
Thus the given statement is false.
Water is transported from the leaves to the stem.
Is the above statement true or false?
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True
0%
False
Explanation
Water moves upward via the stem and reaches the leaves and not vice versa.
Hence the correct option is B.
When a stem bearing leaves is kept in a glass of coloured solution, both the leaves and stem gets coloured.
Is the above statement true or false.
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True
0%
False
Explanation
When the stem is placed in a coloured solution, water moves up the stem and reaches the leaves. Thus both the stem and leaves become coloured.
Hence the statement is true.
When a stem is placed in a coloured solution, it does not become coloured.
Is the above statement true or false?
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True
0%
False
Explanation
When a stem is placed in a coloured solution, water moves up the stem and the stem becomes gradually coloured.
Hence the given statement is false.
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