Class 12 Biology · 18 questions · 0 with answers
A few statements describing certain features of reproduction are given below: i. Gametic fusion takes place ii. Transfer of genetic material takes place iii. Reduction division takes place iv. Progeny have some resemblance with parents Select the options that are true for both asexual and sexual reproduction from the options given below: (a) i and ii; (b ) ii and iii; (c) ii and iv; (d) i and iii.
The term ‘clone’ cannot be applied to offspring formed by sexual reproduction because:
Asexual method of reproduction by binary fission is common to which of the following? i. Some eukaryotes ii. All eukaryotes iii. Some prokaryotes iv. All prokaryotes Choose the correct option from the following:
A few statements with regard to sexual reproduction are given below: 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 fertilisation is a rule during sexual reproduction Choose the correct statements from the options below:
A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has
The male gametes of rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively,
Given below are a few statements related to external fertilization. Choose the correct statements. i. The male and female gametes are formed and released simultaneously ii. Only a few gametes are released into the medium iii. Water is the medium in a majority of organisms exhibiting external fertilization iv. Offspring formed as a result of external fertilization have better chance of survival than those formed inside an organism
The statements given below describe certain features that are observed in the pistil of flowers. i. Pistil may produce more than one seed ii. Each carpel may have more than one ovule iii. Each carpel has only one ovule iv. Pistil have only one carpel Choose the statements that are true from the options below:
Which of the following situations correctly describe the similarity between an angiosperm egg and a human egg? i. Eggs of both are formed only once in a lifetime ii. Both the angiosperm egg and human egg are stationary R NIT II: NIT II: SSTRUCTURAL UEPRODUCTION IN ORGANISMS TRUCTURAL O ORGANISATION IN P RGANISATION IN PLANTS ANDA LANTS AND ANIMAL NIMALS 3 iii. Both the angiosperm egg and human egg are mobile iv. Syngamy in both results in the formation of zygote Choose the correct answer from the options given below:
Appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger is mainly because:
Which of the following statements, support the view that elaborate sexual reproductive process appeared much later in the organic evolution. i. Lower groups of organisms have simpler body design ii. Asexual reproduction is common in lower groups iii. Asexual reproduction is common in higher groups of organisms iv. The high incidence of sexual reproduction in angiosperms and vertebrates Choose the correct answer from the options given below:
Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because:
Choose the correct statement from amongst the following:
There is no natural death in single celled organisms like Amoeba and bacteria because:
There are various types of reproduction. The type of reproduction adopted by an organism depends on:
Identify the incorrect statement.
Which of the following is a post-fertilisation event in flowering plants?
The number of chromosomes in the shoot tip cells of a maize plant is 20. The number of chromosomes in the microspore mother cells of the same plant shall be: