Class 10 Science Chapter 7 MCQ

Here, all the statements are correct. Hence, your answer will be option [D].

Here, only one statement is correct. Hence, your answer will be option [A].

Sperms formed in testis are delivered through the vas deferens which joins with another tube called urethra, coming from the urinary bladder.

In binary fission the parent organism divides to form two new organisms.

Spores are the microscopic a sexual reproductive body which are covered by a hard-protective coat. This coat enables them to survive under unfavorable condition like lack of food, lack of water and extreme temperatures. But when the conditions are favorable, then the spores grow to produce new plants. Thus, spores are a kind of seeds of plants.

In early e teenage girls should, breast size increased with darkening of the skin of nipples at the tip of breast. Also, girls begin to menstruate at around this time. In human females, this reflects onset of reproductive phase.

Regeneration is not exactly the same as the reproduction because most simple animals would not depend on being cut into pieces to be able to reproduce. The regeneration of an organism from its cut body parts occurs by the process of growth and development.

It is “not” necessary to plant the whole potato tuber in the ground to produce the new potato plants. We can even plant, to “cut pieces” of a potato tuber in the ground to obtain new plants potato plants. But all these cut pieces of potato tuber should have a bud or eye on them. Each potato plant produces more than one tuber and each tuber has more than one bud which produce more than one new plant. Due to this, the vegetative propagation method of producing potato plants by tuber is much faster than the production of potato plants from seeds.

The new plants produced by artificial vegetative propagation will be exactly like the parent plants. Any desirable features of the parent plant will be replicated in the new plants.

Here, all the statements are correct. Hence, your answer will be option [D].

The flowers are unisexual (papaya, watermelon) contains either stamens or carpels. Since only one reproductive organ is present in them. They depend on cross pollination to form zygote after fertilization. Both stamen and carpels are required for fertilization, so only one of them cannot produce fruits.

The replication or copying of DNA in the cells is done by certain biochemical reaction which synthesize more of genetic material. When the DNA already present in the nucleus of the parent cell is replicated or copied by making more DNA at the time of “asexual reproduction”, then slight variation come in the two copies formed. Due to this, the two DNA molecules formed by replication will be similar but may not be exactly identical to the original DNA. No biochemical reaction can produce 100% same results.

Flowers are the sexual reproductive organs of a plant. They are produced in angiosperms. Majority of flowers are bisexual. After fertilization, they give rise to fruits.

Here, all the statements are correct. Hence, your answer will be option [D].

In sexual reproduction, though the genetic material DNA from two gametes, male and female gametes, combined together to form a new cell “zygote” but the amount of DNA in zygote does not get the doubled. This can be explained as: When a male gamete combined with the female gamete during sexual reproduction, then the new cell zygote will have the normal amount of DNA or normal number of chromosomes in it. For example, the human sperm has 23 chromosomes and the human egg or ovum has also 23 chromosomes. So, when a sperm and an egg fuse together during fertilization, then the zygote formed will have 23 + 23 = 46 chromosomes, which is the normal number of chromosomes.

Under favorable condition (like damp and warm conditions, nutrients), the airborne spores land on food, germinate and produce new plants. These spores spread into air when spore case of plant containing hundreds of spore busts.

Here, all the statements are correct. Hence, your answer will be option [D].

The first occurrence of menstruation at puberty is called menarche. And the permanent stoppage of menstruation in a woman is called menopause. Menopause occurs in women at the age of about 45 to 50 years.

The thread like structure of the bread mould, Rhizopus are called hyphae. The tiny blobs present on them which contains cells or spores are sporangia. The spores eventually develop into new Rhizopus individuals, when they come in the contachment an other-most surface.

The number of chromosomes in parents and off-springs of a particular species remains constant due to halving of chromosome during gamete formation. The gametes are a special type of cells which contain only half of the amount of DNA as compared to normal cells of an organism. So when a male gamete combines with a female gamete during sexual reproduction, then the new cell “zygote” will have normal amount of DNA.

Multiple fission-organisms divided into many daughters cells simultaneously, example Plasmodium. Budding small bud develops on the cell wall of organism that separate and grow further, example yeast. Reduction division-meiosis is described as a process of reduction division. The number of chromosomes is reduced to half. Binary fission-organisms divided into two daughters cells, example Amoeba.

In Spirogyra, asexual reproduction take place by fragmentation, i.e. organisms simply breaks up into smaller pieces upon maturation. Each pieces is grow into new individuals without forming any gametes.

Amoeba and yeast are unicellular while spirogyra is multicellular. But all the three reproduce asexually.

Offspring have greater similarity as only one parent is involved in a sexual reproduction thus no garments one former. The basis of asexual reproduction is mitosis (division of a nucleus into two identical daughter nuclei). Each daughter nucleus has same genetic makeup because of replication of parental DNA. The new offspring produced are called clones.

A sexual reproduction take place without the process of gamete formation and only one parent is needed, examples include Amoeba reproduce by binary fission (division of cell into two similar cells). Yeast, reproduce by budding (small bud develops from body wall of parent that separate and grow further). Banana, reproduce by vegetative propagation (vegetative parts of a plant such as root, stem etc. can produce new plants) In dog, sexual reproduction take place (i.e. it involves two sexes-male and female whose gametes fuse constituting sexual reproduction).