Answer: Option A. -> True
:
A

In human beings, males attain puberty a little later than females. In girls, puberty usually begins at 10-11 years and completes at 15-16 yrs. In boys, puberty begins at 11-12 years and completes around 16-17 years.

Answer: Option C. -> 1 - Peduncle, 2 - Sepal, 3 - Petal, 4 - Stigma, 5 - Style, 6 - Ovary, 7 - Anther, 8 - Stamen
:
C

Answer: Option C. -> It provides resistance against pathogens.
:
A, B, C, and D

Sexual reproduction ensures generation of variations which leads to characteristic changes in the organism. This happens at DNA level and is inherited to the offspring also. Most of the variations are beneficial and happen at a very slow rate. Overall, survival and better adaptability is ensured. It also gives the advantage of resistance against pathogens and parasites.

Answer: Option B. -> 28
:
B
The menstrual cycle lasts for about 28 days in female human beings. The release of ovum is called ovulation and it takes place during the mid period of this cycle. The first mentrual cycle in the lifespan of a female is called menarche and the last menstrual cycle is called menopause.

Answer: Option B. -> False
:
B

Sexual mode of reproduction gives similar but not identical offsprings whereas asexual mode gives mostly identical offspring. Offsprings born by sexual reproduction are not identical because sexual reproduction introduces variation.

Answer: Option D. -> Vas deferens
:
D
The vas deferens is a long, muscular tube that travels from the epididymis into the pelvic cavity, to just behind the bladder. The vas deferens transports mature sperm from the testis to the urethra which is the tube that carries urine or sperm to outside of the body.

Answer: Option B. -> Vasectomy
:
B

  $\bullet$ Vasectomy is a surgical procedure for male sterilisation and/or permanent contraception. During the procedure, the male vas deferens are severed and then tied/sealed in a manner so as to prevent sperms from entering into the seminal stream (ejaculate) and thereby preventing fertilisation.
  $\bullet$ Tubectomy is a similar process in females where the fallopian tube is sealed.
  $\bullet$ Hysterectomy is the removal of uterus which is carried out only is severe disease conditions. 
  $\bullet$ Mastectomy is the medical term for the surgical removal of one or both breasts, partially or completely.

Answer: Option D. -> Fallopian Tube
:
D
Fallopian tube connects ovaries to the inner side of uterus. The main function of the fallopian tube is to transport the egg from the ovary to the uterus.

Answer: Option A. -> True
:
A

When the zygote gets attached to the wall of the uterus (implantation), a disc-like tissue is formed. This tissue provides all the nutrition and oxygen to the growing embryo and removes all the waste material as well.  This disc-like tissue, known as placenta, is also responsible for conferring immunity to the growing embryo.

Answer: Option A. -> ovary, ovule
:
A
Flower is the reproductive part of a plant. The female parts of the flower will create an ovule (unfertilised egg). The egg will remain in the ovary and waits to be fertilised. The male parts (in particular, the anther) will produce pollen, which contains the sperm needed to fertilise the egg. After fertilisation, the ovary develops into a fruit whereas the ovules develop a hard coat and gradually gets converted into seeds.