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D) Ian Wiimut

The figure shows an amoeba undergoing binary fissions with a dividing nucleus.

The human male gamete, the sperm has to flow through the female reproductive tract to reach the fallopian tube, where it can fuse with the ovum. Thus, it requires an organ for rapid and efficient motility for transportation. The tail provides this function. The female gamete or the ovum has to travel very little distance, in which it is helped by the ovary and fallopian tube. Thus, it doesn’t require any tail.

Implantation is the stage in pregnancy where the rapidly growing and dividing embryo gets attached to the wall of uterus of the mother.

Cloning is the production of an exact copy of a cell, any other living part, or a complete organism. Yes, gametes are involved in cloning. Dolly and noah are two cloned animals.

In the life inside uterus of the mother that is in intrauterine life, when the body parts of an embryo can be identified and differentiated, like the eyes, ears, hands, legs, etc. the embryo is called foetus. A mother gives delivery to a fully grown foetus.

Because they have to be motile and reach the non-motile female gamete.

Reproduction is one of the important characteristics of living things. The ability of organism to produce young ones of its own kind is called reproduction. It is essential for the continuation of a species.

The organisms which are produced asexually are genetically identical to the parent and are called clones.

In humans, testes (in male) and ovaries (in female) are reproductive organ which produces the gametes.

Testes produce male gametes called sperms.

Foetus: From 3 months (12 weeks) of pregnancy the embryo is called a foetus.

it's a baby in gestation period 

Testes in a man produce male gametes called sperms.

Sperms: Testes produce millions of male gametes called sperms or male gametes.

The type of reproduction in which only a single parent is involved is called asexual reproduction. Binary fission and budding are two methods of asexual reproduction in animals. Amoeba reproduce by binary fission and Hydra reproduce by budding.

Sperms, which are male gametes are produced by testes.

Sperms are introduced into the vagina of a female, from where they quickly move to cervix.

Testes produce male gametes (sperms) in humans.

Ovaries in a woman produce female gametes called eggs.

The transformation of the larva into an adult through drastic changes is called metamorphosis. Metamorphosis occurs in frog and silk moth.

Penis is an organ which passes the sperms from the man’s body into the vagina in the women’s body during mating.

Asexual reproduction is that type of reproduction in which only single parent is involved. Asexual reproduction takes place by different methods like Budding, Binary fission etc. 

→ Budding: This type of reproduction takes place in Hydra and Bacteria. A part of the organism starts bulging out. Slowly it grows and develops into a separate individual. 

→ Binary fission – In this type of reproduction, a single organism gets divided into two. This type of reproduction takes place in Amoeba. The nucleus of the Amoeba gets divided into two followed by division of their bodies, each part getting one nucleus and developing into a separate individual. 

Embryo stage comes earlier in the development of a human baby from zygote.

The transformation of the larva into adult through drastic changes is called metamorphosis. Frogs and insects are examples of organisms showing metamorphosis. 

The embryo gets embedded in the wall of the uterus for further development.

The embryo gets embedded in the wall of the uterus

The three parts of carpel are :

(i) Ovary: It contains the ovule.

(ii) Style: It exposes tire sigma for pollination.

(iii) Stigma: It is sticky and receives the pollen grains during pollination.

Stamen and pistil.

Micronutrients required by plants are: Zn(zinc), Cu(copper), Cl^– (chlorine)and Mb(molybdenum)

Root hairs provide enormous surface area for absorption. So maximum absorption . of water occurs in this region.

Uniseual is the plant whose flower contain either stamens or carpels but not both.

Example:  Papaya, watermelon.

Bisexiual,is the,plant,whose, flowers contain both  stamens and carpels.

Example : Hibiscus, Mustard.

Mustard, chinarose.

Papaya, watermelon.

(d) All of these

(a) Menstruation 

(b) Ovulation 

(c) Fertilisation 

(d) Contraception 

(e) Nine months

(c) both male and female gametes

The continuous inbreeding may lead to reduced fertility and productivity called inbreeding depression. Self-pollinated crop does not show the ill effects of inbreeding depression because the deleterious allele becomes homozygous and exhibits their lethal effect so it is eliminated by selection.

The number of chromosomes in human ovum is 23.

• Zoospores are flagellated, motile aquatic bodies
• On germination give rise to new plants

Oviparous: Egg laying animals 

e.g Fishes, Reptiles, Amphibians and Birds.

In a fruit, seed arrangement depends on type of placentation. Pea and tomato shows different placentation. Pea shows marginal placentation while tomato shows axile placentation.

(i) Abscisic acid is product A. Its functions are cell division (in fruits and seeds) and breaking of seed dormancy. 

(ii) Abscisic acid. It inhibits the growth. 

(iii) Auxin – elongation of cells and promotes the growth of seedless fruits. 

Gibberellins – stem growth, seed germination and flowering. 

(iv) Values like honesty and responsibility should be present in agricultural practitioners.

In this both nerves and hormonal function is involved so the only part which handles the both is hypothalamus.

Function of P – Master hormone 

Function of Q – Q is pituitary gland and it is responsible for secreting hormones. 

Function of T – Centre of conscious behavior

At Z because the message does not reached the brain cells and as a result the man cannot feel it.

The forest products have been divided into two main categories, that is, main products and secondary products.

1. The neurons have a property of excitability. 

2. The transmission of the nerve impulse along the long nerve fibre is a result of electrical changes across the neuronal membrane during conduction of an excitation. 

3. The plasma membrane separates the outer [extra cellular fluid] and inner solutions [intra cellular fluid/cytoplasm] of different chemical compounds. 

4. The external tissue fluid has both Na⁺ and K⁺ 

5. On the inside there is an excess of K⁺ along with large amount of negatively charged protein molecules and nucleic acid. 

6. This condition of a resting nerve is also called a polarised state and it is established by maintaining an excess of Na+ on the outer side.

It is believed that the earth was in a molten state in the beginning. ’Igneous rocks were the first rocks to be formed due to cooling and solidification of molten matter. Hence, these are called Primary rocks.

The main objective of plantation is to reduce air pollution and for the conservation of vegetation.

The core of the earth is called ‘Nife’. It is made up of Nikel and Iron (Ferrous).