Answer: Option C. -> 20
:
C
A meiocyte is a type of cell that differentiates into a gamete through the process of meiosis. Through meiosis, the diploid meiocyte divides into four genetically different haploid gametes. Therefore a meiocyte typically has a haploid set of chromosomes, that is half the number relative to the somatic cell.In maize, however the meiocyte is diploid and so is its somatic cell. Hence both the meiocyte and somatic cells have 20 chromosomes.

Answer: Option A. -> Cow, sheep, rat, deer, dog, tiger
:
A
The oestrous cycle is the main reproductive cycle of non-primate vertebrates. For example rats, mice, horses, pigs have this form of reproductive cycle. The primates like monkey, ape and man undergo the menstrual cycle. Menstrual bleeding in non-human primates is minimal.

Answer: Option C. -> Viviparous
:
C
Animals reproduce sexually either by producing fertilized egg or by giving birth young ones directly. The viviparous (young one producing) is more evolved method of sexual reproduction.

Answer: Option C. -> Protists and Monerans 
:
C
Asexual reproduction is common in Protista and Monera, which consist of single-celled organisms. Binary and multiple fissions are the common modes of reproduction in these taxa.

Answer: Option A. -> Cladophora
:
A
In some algae the two gametes are so similar in appearance that it is not possible to categorise them into male and female gametes.They are called isogametes eg:-Cladophora.The other organisms mentioned here, that is frog, marchantia and humans produce heterogametes.

Answer: Option D. -> Sucker and Bulb
:
D
Chrysanthemums arepropagated through suckers. Suckers are adventitious buds that develop from roots, and give rise to new plants.Onions however arepropagated throughbulbs, which areunderground stem modifications. Stolons are creeping horizontal plant stems or runner that takes root at points along its length to form new plants and tubers are also stem modifications that give rise to buds.Bulbilis a miniature clone of the parent plant, growing from a bud at the base of each flower.

Answer: Option C. -> Statement A is correct and B is wrong
:
C
In viviparousanimals the embryo is implanted in the female body and it derives nourishment from the parent. These animals provide maximum care for the embryo, nourishing it until it grows into a fully formed fetus and givingbirth toyoung ones. For e.g. mammals. Embryonic care and protection is greatest in these animals, giving their offspring the highest chanceof survival.
Oviparous organisms like reptiles and birdslay fertilised eggs, here even though fertilisation is internal, embryogenesis is external. The eggs laid by these animals are protected by a hard calcareous shell and are laid in a safe place in the environment.
In case of animals that lay unfertilized eggs there is almost no parental care of young ones.
So the statement A is correct and the statement B is not correct.

Answer: Option C. -> 3 → 5 → 1 → 2→ 4      
:
C
During sexual reproduction after gamete formation or gametogenesis, haploid gametes move towards each other, that is a process calledgamete transferand they fuse together. This process is called syngamy or fertilisation and it leads to the formation of a diploid zygote. The zygote then develops into an embryo in a sequence of events that is collectively termed as embryogenesis.

Answer: Option A. -> Reproduction
:
A
Reproduction is the process of formation of a new individual of a species from the pre-existing one. It is meant for perpetuation of a species because the older individuals of each species undergo senescence and die.

Answer: Option C. -> Protists and Monerans 
:
C
Asexual reproduction is common in Protista and Monera, which consist of single-celled organisms. Binary and multiple fissions are the common modes of reproduction in these taxa.