Biology

Biological Reproduction

762 Questions

Biological reproduction encompasses processes like asexual and sexual reproduction, alternation of generations, and specific mechanisms in plants and fungi. This topic is fundamental for biology paper preparation in various competitive exams. Practice these questions to solidify your understanding.

Asexual reproduction structuresPlant and fungi life cyclesCloning and fertilizationReproductive terminology

Biological Reproduction Questions

Multiple choice biology animal behaviour ethology coordination in human beings- chemical control endocrine system in humans

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

  1. Continuous, sparrow, seasonal, hen

  2. Seasonal, lizard, continuous, hen

  3. Continuous, man, seasonal, tiger

  4. Seasonal, hen, continuous, tiger
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Sexuality in Animals Just like plants, animals also exhibit variation in attaining sexual maturity. Some animals remain reproductively active throughout their reproductive phase; such animals are called continuous breeders, e.g., human. On the other hand, there are some animals, which become reproductively active only during favourable seasons in their reproductive phase; such animals are called seasonal breeders, e.g., dog, birds, frog, lizard, tiger, etc.
So, the correct answer is 'Continuous, man, seasonal, tiger'.
Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Identify the correct statement.

  1. Diatoms produce basidiospores

  2. Heterocysts occur in Nostoc

  3. Fronds develop in bryophytes

  4. Multiciliate sperms occur in angiosperms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Nostoc is a cyanobacteria. It has ability to fix atmospheric nitrogen. It converts nitrogen into ammonia. The heterocysts present in it are specialized cyanobacterial cells for nitrogen fixation. It contains enzyme nitrogenase. Nitrogenase is inactivated by oxygen. Hence, the heterocyst creates a micro anaerobic environment.
Thus, the correct answer is 'Heterocysts occur in Nostoc.'
Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Auxospores are formed in the life cycle of diatoms these structure are ________________.

  1. Vegetuative cells with ploidy level N

  2. Asexual spores with ploidy level N

  3. Statosspores with 2N ploidy Level
  4. Sexual spores with ploidy level $2N$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Auxospores are formed by diatoms at an important stage of their life cycle. They are specialized cells which help the diatoms in regaining their normal size. After cell division in diatoms, each daughter cell inherits one of the two valves and hence results in reduction of size of the diatom, to retain the size diatoms produce auxospores and hence they are vegetative.
So, the correct option is, 'Vegetuative cells with ploidy level N'.
Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Which of the following statements is true?

  1. The structural unit of living things is molecule.

  2. All animals are autotrophs.

  3. All organisms reproduce sexually.

  4. Organisms follow a life cycle of birth, growth, reproduction, ageing and death.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • All the living organism is made up of cells which constitute some organic and inorganic molecules and perform all the life process like nutrition (autotrophic or heterotrophic), reproduction (sexual or asexual), excretion. 
  • Each cell arises from pre-existing cells, they divide and increase their numbers and has a certain life span, thus they undergo aging and then death. Thus, the correct answer is option D.
Multiple choice reproduction in angiospermic plants artificial vegetative propagation asexual modes of reproduction common modes of vegetative propagation

Upon observing the slides showing stages of reproduction in Yeast and Amoeba .The correct observation are that of student(s)
students, I, II, III and IV, reported their observations as given below :
I.  Cytokinesis was seen in the Yeast cell.
II.  A chain of buds was seen due to reproduction in Amoeba.
III.  Elongated nucleus was dividing to form two daughter nuclei in Amoeba.
IV.  Single cells of Amoeba and yeast were undergoing binary fission and budding respectively.

  1. I and II

  2. II only

  3. III and IV

  4. I, III and IV
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yeast reproduces by budding, where a small bud forms and eventually detaches, while Amoeba reproduces by binary fission, where the nucleus divides followed by cytokinesis. Statement III correctly describes the nuclear division in Amoeba, and IV correctly identifies the respective modes of reproduction.

Multiple choice reproduction in angiospermic plants artificial vegetative propagation asexual modes of reproduction common modes of vegetative propagation

Organism produced by asexual reproduction are called

  1. clones

  2. offsprings

  3. factors

  4. both (A) and (B)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since the organisms produced by asexual reproduction are completely identical to the parents due to no variation, they are called clones.

So, the correct option is  'clones'.

Multiple choice reproduction in angiospermic plants artificial vegetative propagation asexual modes of reproduction common modes of vegetative propagation

Assertion: Clones are produced by sexual reproduction and same sexual process.

Reason: These are prepared by group of cells descended from many cells or by inbreeding of a heterozygous line

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Clones are asexually produced. These have same genotype and phenotype like parent.

So, the correct answer is 'If both the assertion and reason are false'

Multiple choice reproduction in angiospermic plants artificial vegetative propagation asexual modes of reproduction common modes of vegetative propagation

The phenomenon observed in some plants where in parts of the sexual apparatus is used for forming embryos without fertilisation is called.

  1. Parthenocarpy

  2. Apomixis

  3. Vegetative propagation

  4. Sexual reproduction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Apomixis is the term given to any phenomenon that leads to formation of embryo wherein parts of the sexual apparatus are used, but without fertilisation. Fertilisation is also absent in vegetative propagation, but parts of sexual apparatus are not involved. An example of apomixis is Citrus.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

In lichens, sexual reproduction is usually performed by

  1. Algal partner only

  2. Fungal partner only

  3. Both algal and fungal partner only

  4. Either of the two partners
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lichens exhibit the symbiotic association between algae and fungi. In this plant, algae is the photosynthetic partner involved in food preparation and the fungal partner increases the surface area for the absorption of water and minerals. Also, the fungal partner is involved in sexual reproduction with the help of reproductive structures called apothecia. 

Thus, the correct answer is option B. 

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Choose the correct answers from the alternatives given.
Lichens :

  1. cannot reproduce

  2. need a nitrogen source to live

  3. are parasitic on trees

  4. are able to live in extreme environments
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lichens can reproduce, do not need nitrogen source to live and is a symbiotic relationship between fungi and cyanobacteria. They are able to live in extreme conditions like on a bare rock. 

So, the correct option is 'are able to live in extreme environments'.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

During unfavourable conditions slime molds form spores which are survival for a long time, spore dispersal take place by

  1. Water currents

  2. Air currents

  3. Insects

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Slime moulds are Saprophytic Protists.
  • They move along decaying twigs and leaves engulfing organic material. 
  • Under a suitable condition, they form aggregation called Plasmodium.
  • During unfavourable condition, the plasmodium differentiates and form fruiting bodies bearing spores at their tips.
  • The spores possess true walls.
  • They are extremely resistant and survive for many years even under adverse conditions. 
  • The spores are dispersed by air currents.
  • So, the correct answer is 'Air currents'.
Multiple choice biology reproductive health stds and infertility gm crops biotechnology

When a species of an organism cannot form a zygote but the zygote survives, the phenomenon is known as

  1. Hybrid vigour

  2. Hybrid sterility

  3. Hybrid zygote

  4. Hybrid fertility
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hybrid zygotes sometimes develop into adults, such as mules (hybrids between female horses and male donkeys), but the adults fail to develop functional gametes and are sterile. This phenomenon is called as hybrid sterility. Thus, option B is correct. 

Heterosis, also called hybrid vigour, the increase in such characteristics as size, growth rate, fertility, and yield of a hybrid organism over those of its parents. Plant and animal breeders exploit heterosis by mating two different pure-bred lines that have certain desirable traits. Thus, option A is wrong. 
In some cases, no barriers exist to mating between members of different species. In these cases, the zygote formed is called a hybrid zygote. Thus, option C is wrong. 
Fertility ability of a hybrid is called as hybrid fertility. Thus, option D is wrong.