List of top Biology Questions on reproduction

Read the following statements and choose the set of correct statements:
In the members of Phaeophyceae,
A. Asexual reproduction occurs usually by biflagellate zoospores.
B. Sexual reproduction is by oogamous method only.
C. Stored food is in the form of carbohydrates which is either mannitol or laminarin.
D. The major pigments found are chlorophyll a, c and carotenoids and xanthophyll.
E. Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin.
Choose the correct answer from the options given below:

(a) (i) Explain the process of double fertilization in an angiosperm starting from the germination of pollen grains on the stigma, mentioning the ploidy of the end products formed at the end. State the role of synergids during the course of the process.
(ii) Why does the development of endosperm precede that of the embryo?
OR
(b) (i) Mention the site where fertilization of the ovum occurs in a human female. Explain the process of fertilization and mention how polyspermy is prevented.
(ii) Name the embryonic stage that gets implanted in the uterus. Explain the process of implantation in a human female.

Read the following passage and answer the questions that follow.
Spermatogenesis is an important primary sex characteristic in humans and all other vertebrates. The process is coordinated and controlled under the influence of hormones. It starts with the onset of puberty in humans and thereafter continues. The primordial cells within the embryonic testis which differentiate into spermatogonia are the precursors of the sperms. These are located at the outer walls of the seminiferous tubules where the process of spermatogenesis proceeds.
(a) State the site of action of FSH in the testes and describe its action thereafter.
OR
(a) Describe the role of LH in the process of spermatogenesis.
(b) Name the cells and their products which undergo:
(i) Mitosis and Differentiation
(ii) Meiosis I and Meiosis II
(c) Name the accessory ducts that the sperms travel through from seminiferous tubules to reach the epididymis.

(a) Why is “in vitro fertilization (IVF)” so named? State its importance.
(b) Distinguish between GIFT and ZIFT.

(a) Name any two copper releasing intra-uterine devices. State two reasons that make them effective contraceptives.
(b) Name any two outbreeding devices that flowering plants have developed and explain how they help in encouraging cross-pollination.

Which of the following features is used to identify a male cockroach from a female cockroach ?

Product of sexual reproduction generally generates

Mode of DNA replication in E. coli is

The egg of frog is:

Match each function below with the associated part or parts of the human male reproductive system shown in the figure.

(i) Produces sperm (ii) Conducts the sperm through the penis to the outside of the body (iii) Produces seminal fluid (iv) Connects the epididymis with the urethra

Find out correct order of vegetative propagules of plants like potato, ginger, Agave, Bryophyllum and water hyacinth

Human chorionic gonadotropin is secreted by