Correct Answer: D. Anemometer

Correct Answer: B) adaptation

Explanation

Adaptation is the process by which plants and animals change their structure, physiology and behavior in order to survive. This means that they are able to adjust to new environments in order to thrive and avoid extinction. For example, animals that live in cold environments may develop thicker fur or hibernate during the winter to conserve energy and stay warm. Plants may develop deeper roots to access water in arid environments. Evolution, on the other hand, is the process by which species change over many generations due to genetic variation and natural selection. Adaptation is a mechanism of evolution, but evolution encompasses much more than just adaptation. Succession refers to the gradual change in plant and animal communities over time in a particular area, and hibernation is a specific behavior that some animals use to survive harsh weather conditions. Therefore, the correct answer to this question is option B: adaptation.

Correct Answer: A. Fusion of sperm and egg nuclei

Correct Answer: B. DNA polymerase I

Explanation

While all the answer choices are important in DNA replication, only DNA Polymerase I performs this particular function. Ligase helps bind the newly replaced DNA nucleotides to the rest of the DNA strand. DNA polymerase III is the main synthesizing enzyme of DNA replication, and creates the majority of the DNA strand. DNA polymerase II is less well known than I and III, but it is believed to perform as a repair enzyme which removes incorrectly paired segments of DNA (which can then be filled back in by DNA polymerase I).

Correct Answer: D. interspecific competitio

Correct Answer: A. Both pH and temperature

Explanation

Both pH and temperature can affect how productive an enzyme is. If an enzyme is functioning in an environment that is not at its optimal pH or optimal temperature, the enzyme's activity will decrease.

Correct Answer: D. The union of both cells gives rise to a new mammal

Correct Answer: C. turbidity of water

Explanation

The female reproductive system of human consists of two ovaries located below the kidneys. Close to each ovary is the oviductal funnel which lead into the fallopian tube or oviduct. The fallopian tubes are narrow spiralling tubes that lead down into a wider tube called uterus or womb. The two horned uteri join up to form vagina. The narrow lower end of the uteri which lead into the vagina are called the cervix which regulates the opening of the vagina. The urethra opens into the vagina to form a common passage called the vestible which serves as urinogenital tract. This has an opening through vulva?

(b)

(c) Description of male reproductive organ of a flowering plant: The male reproductive organ of a flowering plant is known as androecium which is made up of stemens. Stamens are made up of stalks called filaments, which carry the anthers. The anthers are made up of pollen sacs which contain the pollen grains containing the male gametes.

Explanation

(a)(i)Disease: A condition in which the normal functions of an organism/part of the body/cell/tissue/organ is impaired/disturbed.

(ii)Symptom: Any observable effect on an organism: Caused by the presence and irritation of a disease-causing agent/pathogen.

(b)(i) Physical barriers:

(i) Skin

(ii) Hairs

(iii) Cuticle

(iv) Epidermis

(v) Bark

(vi) Cell wall lining.

Chemical barriers:

(i) Mucus

(ii) Saliva

(iii) Tears

(iv) Gastric/ HCL and intestinal secretions

(v) Phenolic compound

(vi) Gums

(vii) Tannins

(viii) Wax

(ix) Oily secretions! sebum

(ii)How vaccination protects the body:The vaccine/attenuated pathogen is administered into the body. The body responds by producing copious antibodies. The next time the body is exposed to the same antigen/infection/pathogen antigen, the memory cells allow a more rapid and heightened/vigorous response to antibody production. Protection of the body against future infections.

(c) Differences between antibodies and antigens

(I) Antibodies is a protein molecule. Antigens May not be a protein molecule

(ii) Antibodies is Produced in response to a particular foreign substance/antigen while antigens Stimulates formation of antibodies

(iii) Antibodies Usually found in the plasma fluid of the blood,antigens are Usually produced in/introduced into the body.

(iv) Antibodies are Protective in functions, antigens Leads to an immune response/immunity.

(d) Causative Agent:

(i)Malaria: Plasmodium vivax/Plasmodium/malaria/species

(ii)Cholera: Vibrio cholera.

(ii)AIDS: Human Immuno-deficiency virus/HIV