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CBSE Questions for Class 7 Biology Reproduction In Plants Quiz 3 - MCQExams.com
CBSE
Class 7 Biology
Reproduction In Plants
Quiz 3
Choose the correct statements from the options below with regard to sexual reproduction in plants.
(i) Sexual reproduction does not always require two individuals.
(ii) Sexual reproduction generally involves gametic fusion.
(iii) Meiosis never occurs during sexual reproduction.
(iv) External fertilization is a rule during sexual reproduction.
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(i) and (iv)
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(i) and (ii)
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(ii) and (iii)
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(ii) and (iv)
Explanation
(i) Sexual reproduction does not require two individuals because the fusion of two gametes released from the same plant can take place.
(ii) Sexual reproduction is a process where gametic fusion takes place between two gametes of different sexes.
(iii) Meiosis occurs during sexual reproduction to produce haploid gametes.
(iv) External fertilization need not take place in sexual reproduction. It can also be internal. Eg: humans.
So, the correct option is '(i) and (ii)'.
Consider the following statements and select the option which correctly identifies true (T) and false (F) ones.
(i) Ovary ripens to form seed and ovule ripens to form fruit after fertilization.
(ii) Seed dispersed through water usually develop floating ability in the form of spongy or fibrous outer coat as in coconut.
(iii) Pollination occurs before fertilization.
(iv) Cutting, layering, grafting and tissue culture are the natural methods of vegetative propagation .
(i) (ii) (iii) (iv)
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F $$ \; $$ $$\; $$ F $$\; $$ $$\; $$ T $$\; $$ $$\; $$ F
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F $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ F
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T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ F
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F $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T
Explanation
The ovary ripens to form fruit while the ovule ripens to form a seed after fertilization. Thus, the first statement is False.
Seeds of the fruits get dispersed by different methods.
The coconut plant produces the fruit with a fibrous coating that allows the fruit to float in the water. The seeds of the fruits in coconut are dispersed with the help of water. So, the second statement is True.
Pollination is the transfer of pollen from stamen to the stigma of the same flower or different flower of the same species before fertilization. Hence, the third statement is True.
Cutting, layering, grafting, and tissue culture are artificial methods of vegetative propagation. So, the fourth statement is False.
The correct option is B.
Which among the following statements are true for unisexual flowers?
(i) They possess both stamen and pistil.
(ii) They possess either stamen or pistil.
(iii) They exhibit cross pollination.
(iv) Unisexual flowers possessing only stamens cannot produce fruits.
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(i) and (iv)
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(ii), (iii) and (iv)
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(iii) and (iv)
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(i), (iii) and (iv)
Explanation
In angiosperms, flowers can be unisexual having either stamen or pistil; or bisexual having both stamen and pistil in the same flower.
In both types of flowers, Pistil bears ovary.
Since unisexual flowers have either male or female sexual organs. Therefore, they cannot self-pollinate and, thus, show cross-pollination
Fruit is ripened or mature ovary.
After fertilization ovary undergoes major changes and its wall also thickens to produce fruit. That means a staminate flower (flower with only stamens) cannot produce fruits.
Therefore, the correct answer is option B.
In maize, a meiocyte has $$20$$ chromosomes. What will be the number of chromosomes in its somatic cell?
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$$40$$
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$$30$$
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$$20$$
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$$10$$
Which of the following options show two plants in which new plantlets arise from the same organ?
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Dahlia and ginger
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Potato and sweet potato
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Dahlia and rose
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Potato and sugarcane
Explanation
New plantlets in potato and sugarcane arise from bud on stem. Potato have buds over their nodes or eyes.
The buds produce new plantlets when a part of its having a node is placed in the soil. Sugarcane is propagated by planting segments of stems having at least one node.
The vegetative propagation of
Dahlia
is done by tuberous roots. Tuberous roots have an abundant storage of reserved food material.
In ginger, the vegetative propagation occurs through the underground stem called a rhizome or by roots in sweet potato.
We propagate rose artificially through stem cuttings.
So, the correct option is D- Potato and sugarcane.
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