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Test: Sexual Reproduction (Old NCERT) - NEET MCQ


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30 Questions MCQ Test Biology Class 12 - Test: Sexual Reproduction (Old NCERT)

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Test: Sexual Reproduction (Old NCERT) - Question 1

Which of the following groups is formed only of the hermaphrodite organisms?

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 1

In some lower animals both male and female sex organs are present in the same individual, such are called hermaphrodite, monoecious or bisexual, e.g tapeworm, earthworm and leech, etc.  

Test: Sexual Reproduction (Old NCERT) - Question 2

Which of the following is a dioecious organism?

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 2

Organism shown in figure (d)  is Nereis. It is unisexual or dioecious and its reproductive phase is called ‘heteronereis’ Fertilization occurs in sea water.

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Test: Sexual Reproduction (Old NCERT) - Question 3

Following table summarizes the differences between self fertilization and cross-fertilization. Pick out the wrong difference.

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 3

Self-fertilization occurs in Taenia, while cross fertilization occurs in Pheretima, Periplaneta and Rana tigrina.

Test: Sexual Reproduction (Old NCERT) - Question 4

It is observed that simple organisms like algae and fungi normally reproduce asexually but before the onset of adverse conditions they shift to sexual reproduction. It is so because sexual reproduction

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 4

During favourable conditions, simple organisms like algae and funai multiply asexually but during unfavourable conditions gametes are formed. The gametes fuse to form zygotes which often develop a thick wall to become zygospores. The latter are dispersed. Under favourable zygospore germinates to form new organisms. Since fusion of gametes from different parents occur during sexual reproduction, hence genetic recombination takes place causing variations. Variations, being a major factor of natural selection, play an important role in evolution.

Test: Sexual Reproduction (Old NCERT) - Question 5

The growth phase of an organism before attaining sexualmaturity is referred to as

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 5

Juvenile phase is pre-reproductive phase in life cycle of an individual. It is the period of growth between the birth of an individual upto reproductive maturity. Juvenile phase is known as vegetative phase in plants. This phase is of different durations in different organisms.

Test: Sexual Reproduction (Old NCERT) - Question 6

Clear cut vegetative, reproductive and senescent phases cannot be observed in

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 6

Perennial plants live for a few to several hundred years, hence vegetative, reproductive and senescent phases cannot be observed clearly

Test: Sexual Reproduction (Old NCERT) - Question 7

Given figure of Hydra shows its reproductive structures and manner of fertilition

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 7

cross-fertilisation occurs in Hydra. The testis matures earlier than the ovary. Spermatozoa released from the testis of one Hydra's swim in water with their tails and finally come into contact with the ovum of another Hydra.

Ovum lives inly for a short time after it is exposed. during this period, fertilization must take place. Thus, given figure is not showing self fertilization but cross fertilisation.

Test: Sexual Reproduction (Old NCERT) - Question 8

Organisms reproducing throughout the year are called ______ breeders e.g., ________, and those who show recurring sexual activity are called __________ breeders e.g., _________.

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 8

Continuous breeders continue to breed throughout their sexual maturity. Examples are honey bee, rabbit, mice. cattle, man, etc. Seasonal breeders reproduce at particular period of the year such as frog, lizard, most birds, deer, tiger, etc.

Test: Sexual Reproduction (Old NCERT) - Question 9

Strobilanthus Kunthiana differs from bamboo in

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 9

Strobilanthus kunthiana (Neelakuranji) flower once in 12 years, its juvenile phase is very long. The last time this plant flowered was during September - October 2006. It is found in hilly areas of Kerala, Karnataka and Tamil Nadu and attract a large number of tourists.

Test: Sexual Reproduction (Old NCERT) - Question 10

Which of the following is an incorrect combination of organism with its chromosome number in meiocyte and in gamete?

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 10

Chromosome number in meiocyte (2n) of onion cell is 32, while chromosome number in gamete (n) is 16.

Test: Sexual Reproduction (Old NCERT) - Question 11

Read the following statements and select the correct option 
Statement 1: In gymnosperms, endosperm is formed before fertilization and is haploid.
​Statement 2: In angiosperms, endosperm is formed after fertilization and is diploid. 

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 11

In gymnosperms, endosperm is haploid and is formed Before fertilization. In angiosperms, the endosperm is a special tissue which is formed as a result of vegetative fertilization, triple fusion or fusion of a male gamete with diploid secondary nucleus of the central cell. It is triploid in nature.

Test: Sexual Reproduction (Old NCERT) - Question 12

If a leaf cell of Agave has x chromosomes then what will be the number of chromosomes in a cell of its bulbil?

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 12

In Agave, bulbils are modified floral buds that develop on the flowering axis, so chromosome number in a cell of bulbil will be equal to that of leaf cell of Agave, i.e., n=x.

Test: Sexual Reproduction (Old NCERT) - Question 13

The changes that indicate reproductive maturity in humans include

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 13

Reproductive organs develop and mature during puberty. Changes that indicate reproductive maturity are development of external genitalia, breasts, body hair, pubic hair, changes in skeleton, etc

Test: Sexual Reproduction (Old NCERT) - Question 14

Read the following statements about the reproductive cycles in mammals and select the correct ones. 
(i) Oestrous cycle occurs in primate mammals 
(ii)  in species with oestrous cycle females are generally sexually active during estrous phase
iii) Both the cycles show monthly recurrence. 

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 14

Oestrous cycle occur in non-primates such as cows, dogs, etc. Menstrual cycle occurs in primates only. Menstrual shows monthly recurrence but oestrous cycle does not.

Test: Sexual Reproduction (Old NCERT) - Question 15

Senescent phase of an organism's life span can be recognized

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 15

The terminal irreversible stage of ageing is called senescence. This is the last phase of life span, that ultimately leads to death. In both plants and animals, hormones are responsible for the change over from one phase to another This phase can be recognised by slow metabolism, cessation of reproduction and decreased immunity.

Test: Sexual Reproduction (Old NCERT) - Question 16

Staminate flowers produce 

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 16

Staminate flowers are those which have only male propagative organs, or stamens, or have infertile female organs. Staminate flowers produce only pollen (antherozoids) and are not capable of producing fruit.

Test: Sexual Reproduction (Old NCERT) - Question 17

Meiosis does not occur in

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 17

Meiosis is the process by which one diploid eukaryotic cell divides to generate four haploid cells often called gametes. Meiosis is essential for sexual reproduction and therefore occurs in all eukaryotes that reproduce sexually. Meiosis does not occur in archaea or bacteria, which reproduce via asexual processes such as mitosis or binary fission.

So, the correct option is 'Asexually reproducing diploid individuals'.

Test: Sexual Reproduction (Old NCERT) - Question 18

If a leaf cell of Agave has x chromosomes then what will be the number of chromosomes in a cell of its bulbil? 

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 18

In Agave, bulbils are modified floral buds that develop on the flowering axis, so chromosome number in a cell of bulbil will be equal to that of leaf cell of Agave, i.e., n = x

Test: Sexual Reproduction (Old NCERT) - Question 19

A diploid parent plant body produces ______________gametes and a haploid parent piant body produces ___________ gametes. 

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 19

Gametes are haploid whether the structures or cells producing them are haploid or diploid.
 

Test: Sexual Reproduction (Old NCERT) - Question 20

Which of the following options shows bisexual animals only? 

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 20

 When both male and female sex organs are present in the same individual, such animals are called hermaphrodite, monoecious or bisexual, e.g., tapeworm, earthworm and leech.
 

Test: Sexual Reproduction (Old NCERT) - Question 21

Which of the following organisms has the highest number of chromosomes? 

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 21

Ophioglossum is a fern having highest number of chromosomes. Chromosomes number in meiocyte (2n) = 1260. Chromosome number in gamete (n) = 630.

Test: Sexual Reproduction (Old NCERT) - Question 22

In maize, a meiocyte has 20 chromos. What will be the number of chromosomes in its somatic cell ? 

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 22

The germinal cells are diploid and act as meiocytes,which undergo meiosis to produce haploid gametes. Thus, meiocytes have diploid (2n) number of chromosomes, same as the somatic cells.

Test: Sexual Reproduction (Old NCERT) - Question 23

Which of the following statements is not correct regarding sexuality in organisms?

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 23

Cross-fertilisation occurs in many hermaphrodite animals as in earthworm. It is due to the fact that their male and female reproductive organs mature at different times.

Test: Sexual Reproduction (Old NCERT) - Question 24

Which of the following statements is incorrect?

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 24

Sex organs in human are formed before birth (during embryonic development).

Test: Sexual Reproduction (Old NCERT) - Question 25

Read the following statements and select the correct option.

Statement 1: Honey bees often pollinate red coloured flowers.
Statement 2: Honey bees visit flowers for pollen grains only

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 25

Honey bees are attracted towards blue, purple-violet and yellow flowers. Bees use ultraviolet radiation for observation. Red appears black in ultraviolet radiation. Therefore, bees seldom visit red flowers. Honey bees visit flowers for nectar and pollen grains.

Test: Sexual Reproduction (Old NCERT) - Question 26

If a fungal thallus has both male and female reproductive structure, it will be called

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 26

Depending upon the compatibility in sexual reproduction, fungi are of two types - homothallic and heterothallic. In homothallic forms, fusion occurs between genetically similar types. Fusion involves the union of cytoplasms as well as nuclei. In heterothallic forms, fusion occurs between gametes belonging to different parents.

Test: Sexual Reproduction (Old NCERT) - Question 27

Oestrous cycle is reported in

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 27

Oestrous cycle occur in non-primates such as cows, dogs, etc. Menstrual cycle occurs in primates only. Menstrual shows monthly recurrence but oestrous cycle does not .

Test: Sexual Reproduction (Old NCERT) - Question 28

Sexual reproduction is considered more beneficial than asexual reproduction because

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 28

Sexual reprodction occurs in almost all types of animals and mostly in higher plants. It is usually biparental. Daughter organisms genetically digger from the parents. Since there are variations, it contributes to evolution of the species.

Test: Sexual Reproduction (Old NCERT) - Question 29

Select the incorrect statement about external fertilization. 

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 29

The incorrect statement about external fertilization is:

  1. Organisms showing external fertilization produce a large number of male gametes only.

This statement is incorrect because in external fertilization, both male and female gametes are released into the external medium, such as water, where fertilization takes place. Therefore, statement 1 is incorrect.

External fertilization is a reproductive strategy where fertilization takes place outside the body of the organism, usually in a water medium. It is true that external fertilization requires synchronization between the release of male and female gametes, and is more uncertain compared to internal fertilization, which occurs inside the body of the organism.

It is also true that external fertilization is common in many fish and amphibian species, but it is not always replaced by internal fertilization in higher organisms. Some higher organisms, such as some reptiles, birds, and monotremes (egg-laying mammals), still use external fertilization as their primary mode of reproduction.

Therefore, the correct answer is option 1: Organisms showing external fertilization produce a large number of male gametes only.

Test: Sexual Reproduction (Old NCERT) - Question 30

Figure P represents the reproductive organs of Chara plant and figure Q represents the reproductive organs of earthworm. Select the optikon which correctly identifies male reproductive organs of the two organisms.

Detailed Solution for Test: Sexual Reproduction (Old NCERT) - Question 30

Male sex organ in Chara is round in structure, called antheridium (B). It lies below the ovate shaped female sex organ called oogonium. Earthworm is bisexual or hermaphrodite organism. (C) show two pair of testis sacs, situated in the tenth and eleventh segments.

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