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Assertion & Reason Test: How do Organisms Reproduce? - Class 10 MCQ


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15 Questions MCQ Test Online MCQ Tests for Class 10 - Assertion & Reason Test: How do Organisms Reproduce?

Assertion & Reason Test: How do Organisms Reproduce? for Class 10 2024 is part of Online MCQ Tests for Class 10 preparation. The Assertion & Reason Test: How do Organisms Reproduce? questions and answers have been prepared according to the Class 10 exam syllabus.The Assertion & Reason Test: How do Organisms Reproduce? MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: How do Organisms Reproduce? below.
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Assertion & Reason Test: How do Organisms Reproduce? - Question 1

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Clones are offspring of an organism formed by asexual reproduction.

Reason : Clones have exact copies of DNA as their parents.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 1
Clones are defined as a group of morphologically and genetically identical individuals. In the process of asexual reproduction,only one parent is involved to produce morphologically and genetically similar off spring from parents and are thus called clones
Assertion & Reason Test: How do Organisms Reproduce? - Question 2

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Colonies of yeast multiply in sugar solution.

Reason : Sugar is made of sucrose which provides energy for sustaining all life activities

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 2
Yeasts are eukaryotic microorganisms, classified in the kingdom Fungi. Yeasts are chemoorganotrophs and they use organic compounds as a source of energy. Carbon is obtained through various sugars. Yeasts can metabolize sugars as they ferment sugar resulting in the formation of ethanol. So, sugar provides energy to yeasts, which helps to carry out various life processes.

So, the correct answer is 'Sugar provides energy for sustaining all life activities in yeasts'.

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Assertion & Reason Test: How do Organisms Reproduce? - Question 3

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Asexual reproduction is a primitive type of reproduction.

Reason : Asexual reproduction involves only mitotic cell division.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 3
Organisms reproduce for perpetuation of species because individuals have a limited life span. Organisms may reproduce sexually as well as asexually. The sexual reproduction involves formation of haploid gametes through the process of reduction division or meiosis. The haploid gametes fuse during fertilization to form diploid zygote. Thus, restoring the normal ploidy. The asexual reproduction does not involves gamete formation through meiosis or their fertilization. The vegetative propagation in plants is a type of asexual reproduction in which plant body is propagated directly from some vegetative part of adult plant.
Assertion & Reason Test: How do Organisms Reproduce? - Question 4

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Spores are unicellular bodies.

Reason : The parent body simply breaks up into smaller pieces on maturation

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 4
Spore formation - Spore formation is generally seen in bacteria and most fungi. Spores are unicellular bodies, formed by the parent organism to carry out reproduction. If environmental conditions are suitable, the spore will develop into a new individual. Spores come in a wide variety of forms and are produced and dispersed in many different ways. Spores are very effective, because they are small and light, and so can be carried by wind, water or animals; so they can travel far away from the parent, perhaps to better conditions.
Assertion & Reason Test: How do Organisms Reproduce? - Question 5

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : At puberty, in boys, the voice begins to crack and thick hair grows on the face.

Reason : At puberty, there is decreased secretion of testosterone in boys.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 5
Puberty in boys is regulated by male sex hormone called testosterone, which are secreted by testes. In puberty, secondary sexual characteristics like growth of hair on face, chest, broadening of shoulders and deepening of voice occurs.
Assertion & Reason Test: How do Organisms Reproduce? - Question 6

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Plasmodium reproduces by multiple fission.

Reason : Multiple fission is a type of asexual reproduction.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 6
Multiple fission is the process of asexual reproduction in which instead of 2 daughter cells, many daughter cells are produced from the parent cell. In this, the nucleus undergoes repeated division to produce a large number of nuclei. Each nucleus along with a little bit of cytoplasm forms a membrane around it. All the daughter cells are equal sized and are similar. Plasmodium, true slime molds (Myxomycetes) exhibit this type of asexual reproduction.
Assertion & Reason Test: How do Organisms Reproduce? - Question 7

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals.

Reason : Eggs of most mammals, including humans, are of centrolecithal type.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 7
Holoblastic type of cleavage with equal sized blastomeres is commonly seen in eggs containing moderate to sparse amount of yolk. It is characteristic of mammals.

Reason is incorrect as eggs of most mammals including humans are of alecithal, meaning negligible amount of yolk. Centrolecithal eggs are found in insects, where yolk is present at the center of the egg with cytoplasm around it.

Therefore, the correct answer is option C.

Assertion & Reason Test: How do Organisms Reproduce? - Question 8

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Asexual reproduction is also called blastogenesis.

Reason : In asexual reproduction, their is no formation and fusion of gametes.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 8
The process of asexual reproduction with the help of any part of the body not inclusive of the reproductive parts is known as blastogenesis. Asexual reproduction is the method in which single parent gives rise to the offspring. There is no formation or fusion of the gametes because the single parent is involved.

Thus, the correct answer is option B.

Assertion & Reason Test: How do Organisms Reproduce? - Question 9

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Urethra in human male acts as urogenital canal.

Reason : Urethra carries only urine while sperms are carried by vasa deferentia only.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 9
The urethra is the canal through which urine is discharged from the bladder in most mammals and through which semen ( the fluid like discharge containing male gametes, sperms) is also discharged in the males and hence, it is called urogenital tract. So, urethra carries both urine and sperms.

Thus, the correct answer is option C.

Assertion & Reason Test: How do Organisms Reproduce? - Question 10

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Pollen grains from the carpel stick to the stigma of stamen.

Reason : The fertilised egg cells grow inside the ovules and become seeds.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 10
The pollen grain is transferred from the anther to the stigma of the carpel. The stigma is the receptive surface of the female part of the flower.

On the other hand, the ovary often supports a long style, topped by a stigma. The mature ovary is a fruit, and the mature ovule is a seed. The stigma is the part of the pistil where pollen germinates.

Assertion & Reason Test: How do Organisms Reproduce? - Question 11

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Unisexual flowers have separate male and female flowers whereas a typical monocot embryo comprises an embryonal axis with single cotyledon.

Reason : Cucumber, pumpkin and water melon are example of unisexual flowers.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 11
Unisexual flowers have separate male and female flowers. The example includes cucumber, pumpkin and watermelon.
Assertion & Reason Test: How do Organisms Reproduce? - Question 12

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : In human male, there are perianal glands near the anus.

Reason : Perianal glands secrete sex-attractant pheromone which initiates sexual desire in human female.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 12
Perineal gland are found in rabbit but not in human beings. These are a pair of dark elongated scent glands lying behind the cowper's glands. These are sex attractant secreting glands, its smell serves as sex attractant for the female.
Assertion & Reason Test: How do Organisms Reproduce? - Question 13

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Vasectomy is a surgical method or birth control.

Reason : In vasectomy, a small portion of the oviduct is cut or tied properly.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 13
Vasectomy is a surgical method or birth control. in which a small portion of the sperm duct is cut or tied properly.
Assertion & Reason Test: How do Organisms Reproduce? - Question 14

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Vagina is also called the birth canal.

Reason : During birth, the baby passes through the vagina.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 14
Vagina is called the birth canal, because the baby passes through the vagina during birth.
Assertion & Reason Test: How do Organisms Reproduce? - Question 15

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : In human male, testes are extra-abdominai which are present inside scrotum.
Reason : Scrotum has a relatively lower temperature needed for the production and storage of sperms.

Detailed Solution for Assertion & Reason Test: How do Organisms Reproduce? - Question 15

(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

Explanation: Formation of sperms needs lower temperature than the normal body temperature. Hence, testes lie outside the body cavity in the scrotum.

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