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Published on: 28/05/2021
QB365 Provides the HOT Question Papers for Class 12 Biology, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams
Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology
Questions + Answers key
Take MCQ Biology Test1.
It is found that in organisms like algae, fishes and amphibians gametes are produced in a large number. Suggest a reason to support your answer.
2.
In turkey there is no males found. Why? How is it possible? Give term for such type of reproduction.
3.
The chromosome number of a meiocyte of a house fly and that of a human is 12 and 46 respectively. What is the number of chromosomes in their mitocytes?
4.
“Sexual reproduction generally involves fusion of gametes from two different parents belonging to a species, but this is not always true.” What explanation can you give in support of the statement?
5.
The population of humans on this earth would not have been this much if humans had oestrous cycle rather than menstrual cycle. Give your justification?
6.
“Any organic material kept in moist and dark conditions gets infected with fungus, although there was no sign of fungus prior to it.” How fungus does make it possible, although it is a microbe?
7.
In a pond you see green colour BMR (Basic Metabolic Rate)?
8.
Meiosis generally occurs during gametogenesis in sexually reproducing organisms.Why?
9.
The turkey usually produces females for several generations. How is this possible?
10.
What is the major difference between the development of zygote in animals and that in plants?
11.
Why do internodal sagments of sugar cane fail to propagate vegetatively even when they are in contact with damp soil?
12.
In yeast and Amoeba, the parent cell divides to gives rise to two new individual cells. How does the cell division differ in these two organisms?
13.
Offspring derived by asexual reproduction are called clones. Justify giving two reasons.
14.
All papaya plants bear flowers, but fruits are seen only in some. Explain.
15.
How are Cucurbita plants different from papaya plants with reference to the flowers they bear?
1.
( )
To enhance the chance of syngamy that occurs externally in water.
2.
( )
It is parthenogenesis. In turkey diploid egg mother cell directly developed in to a female zygote.
3.
( )
Meiocyte – A cell that can undergo meiosis ( Diploid no. is 46 for humans)
4.
( )
Self fertilization involves both the gametes from one parent only
5.
( )
If ever that would have been the situation then humans would have been seasonal breeders. So it might have some reducing effect on the population.
6.
( )
Reproduction by sporulation. Spores are dry, light, easily dispersed by wind so they can reach every corner of the biosphere.
7.
( )
Fragmentation (vegetative method).
8.
( )
Gametogenesis in sexually reproducing organisms generally involves meiosis in order to produce haploid gametes in normally diploid organisms.
9.
( )
The whiptail lizard/turkey shows parthe-nogenesis, the phenomenon which the female gamete undergoes development without fertilisation into adult.
10.
( )
In animals, the zygote develops immediately after its formation.
In plants more often, the zygote develops a thick wall and undergoes a period of rest
11.
( )
The plantlets arise from the buds present on the nodes; only when the nodes come in contact with the damp soil, will they produce roots and shoots and not from internodal segments.
12.
( )
1. In yeast, the cell division is unequal; the small cell grows into a bud, which remains attached to the large cell in the initial stages, but gets separated later.
2. In Amoeba, the cell reproduces by binary fission, where the cell divides into two halves and each one grows into an adult.
13.
( )
They are genetically and morphologically identical among themselves and identical to the parent.
14.
( )
The plant is dioecious; the plants which produce only male flowers, do not bear fruits, while the plants which produce female flowers, bear fruits.
15.
( )
Papaya plants are dioecious as an individual plant bears exclusively either staminate flowers or pistillate flowers.
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