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- Question
The biogenetic law was proposed by
Options- A. Alfred Russel Wallace
- B. Charles Darwin
- C. Ernst von Haeckel
- D. Lamarck
- Correct Answer
- Ernst von Haeckel
ExplanationThe biogenetic law states that ontogeny (study of development) repeats phylogeny (origin from previous group of racial history), The young one of the frog namely the tadpole is like a fish cosidered to be ancestral to frog.
- 1. Which of the following plays an important part in photosynthesis?
Options- A. Chloroplast
- B. Centrosome
- C. Tonoplast
- D. Nematoblast Discuss
- 2. Cretinism is due to the disorder of the glands
Options- A. Thymus
- B. Parathyroid
- C. Thyroid
- D. Adrenal Discuss
- 3. In electro - magnetic radiation, which of the following has greater wave - length than visible light
Options- A. Ultra -violet rays
- B. Infra - red rays
- C. Cosmic rays
- D. x-rays Discuss
- 4. The inner most membrane that covers the brain is
Options- A. Pleura
- B. Duramater
- C. Pia - mater
- D. Arachnoid membrane Discuss
- 5. The hormone that helps in the implantation of embryo
Options- A. Testosterone
- B. Insulin
- C. Prolactin
- D. Progesterone Discuss
- 6. The rate of heartbeat is accelerated by the harmone
Options- A. adrenaline
- B. acetylcholine
- C. thyroxine
- D. pituitrin Discuss
- 7. Food wrapped in news paper is likely to get contaminated by
Options- A. Magnesium
- B. Alluminium
- C. Lead
- D. Copper Discuss
- 8. In which of the following kind of organisms is the phenomenon found where in the female kills the male after copulation __________
Options- A. Drgonfly
- B. Honey bee
- C. Spider
- D. Pit viper Discuss
- 9. Which of the following is not an Endocrine Gland?
Options- A. Spleen
- B. Pituitary
- C. Thyroid
- D. Adrenal Discuss
- 10. What holds the sides of the DNA ladder together?
Options- A. Polar covalent bonds
- B. Ionic bonds
- C. Metallic bonds
- D. Covalent bonds Discuss
Biology problems
Search Results
Correct Answer: Chloroplast
Explanation:
The Chloroplast contains the wonder green pigment chlorophyll which is able to trap solar energy and use it for synthesis of food
Correct Answer: Thyroid
Explanation:
Cretinism is a disease caused by hypothyroidism (less thyroxine formation) . The symptoms of the disease are retardation of mental, physical and sexual developments. potbelly, protruding tongue, dry skin etc are also indicative of this disease.
Correct Answer: Infra - red rays
Correct Answer: Pia - mater
Correct Answer: Progesterone
Correct Answer: adrenaline
Explanation:
The hormone adrenaline also called epinephrine is known as a stress harmone. In emotional upset (like fear, anger etc.) this harmone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.
Correct Answer: Lead
Explanation:
It gets contaminated by lead
Correct Answer: Spider
Correct Answer: Spleen
Explanation:
Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct.
The major glands of the endocrine system include the
pineal gland,
pituitary gland,
pancreas,
ovaries,
testes,
thyroid gland,
parathyroid gland,
hypothalamus and
adrenal glands.
Correct Answer: Covalent bonds
Explanation:
Deoxyribose, which is a pentose, and a phosphate group are the two molecules together form the two sides of the DNA i.e, A sugar (deoxyribose) and a phosphate.
DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase). Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases. The bases are adenine (A), thymine (T), cytosine (C) and guanine (G). A and T are connected by two hydrogen bonds. G and C are connected by three hydrogen bonds.
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