Exam-style CBSE practice questions on Sexual Reproduction (How do Organisms Reproduce?). Try each one first, then reveal the correct answer and a step-by-step explanation. Free, from EduLevel — the AI teacher for CBSE.
Identify the structure that is not a component of the female reproductive system in humans.
Consider the primary functions of the male and female reproductive systems in reproduction.
Explanation: The vas deferens is a part of the male reproductive system that carries sperm. The ovary, uterus, and fallopian tube are all parts of the female reproductive system.
What does the anther of a flower contain?
Think about the role of the anther in the process of plant reproduction. What is its main function?
Explanation: The anther is the part of the stamen (male reproductive organ of a flower) where pollen grains are produced and stored.
Identify the correct statement(s) regarding a bisexual flower from the options below: (i) They possess both stamen and pistil. (ii) They possess either stamen or pistil. (iii) They exhibit either self-pollination or cross-pollination. (iv) They cannot produce fruits on their own.
Think about the basic reproductive parts of a flower and what it means for a flower to be 'bisexual'.
Explanation: A bisexual flower contains both male (stamen) and female (pistil) reproductive parts. This structure allows it to undergo both self-pollination (pollen from the same flower) and cross-pollination (pollen from another flower).
In which of the following locations does the type of cell division that halves the number of chromosomes occur?
Think about the type of cell division that is responsible for producing gametes (sperm and egg cells) for sexual reproduction. This process is different from the one that causes growth and repair.
Explanation: This type of cell division, meiosis, occurs in the reproductive organs (testis and ovary) to form haploid gametes.
Select the option that shows the correct sequence of the parts of the female reproductive system of a flowering plant based on their physical arrangement.
Consider the journey of pollen from pollination to fertilization within the pistil of a flower.
Explanation: The correct arrangement from the top receptive part downwards is stigma, the stalk-like style, the basal ovary, and the ovules contained within the ovary.
In a bisexual flower, which part contains the male gametes?
Consider the fundamental parts of a flower and their roles in reproduction. Think about which part is specifically responsible for producing the male reproductive cells.
Explanation: The anther is part of the stamen (the male reproductive organ) and is responsible for producing pollen grains, which contain the male gametes.
Which part or parts of a flower are responsible for attracting insects for pollination?
Think about what makes a flower visually appealing and noticeable to creatures from a distance.
Explanation: Petals are typically brightly colored and fragrant, which serves to attract insects and other animals to the flower for pollination.
A human zygote is formed by the fusion of a male and a female gamete. What is the number of chromosomes in a human zygote?
Think about the process of fertilization and how genetic material from parents combines to form a new individual.
Explanation: Human gametes (sperm and egg) are haploid, each containing 23 chromosomes. The fusion of these two gametes during fertilization results in a diploid zygote with a total of 46 chromosomes.
Which of the following statements about the placenta is incorrect?
Consider the primary function of the placenta in facilitating the exchange of substances between the mother and the developing fetus.
Explanation: This statement is incorrect because the placenta has a large surface area, enhanced by numerous villi, to maximize the efficient transfer of nutrients and gases to the developing embryo.
Offspring formed as a result of sexual reproduction exhibit more variations primarily because:
Think about how new genetic combinations are formed during reproduction.
Explanation: Sexual reproduction involves the fusion of gametes from two different parents, which combines their genetic material. This recombination of genes is the primary source of variation in the offspring.
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