How do poriferan animals differ from coelenterate animals?
[question] Question. How do poriferan animals differ from coelenterate animals? [/question] [solution] Solution: [/solution]...
Read More →What is the function of receptors in our body ?
[question] Question. What is the function of receptors in our body ? Think of situations where receptors do not work porperly. What problems are likely to arise ? [/question] [solution] solution: All information from environment is detected by receptors. Receptors pass information in the form of electrical impulses to brain by nerve cells and brain send information to effector organs for response. When receptors do not work properly, information from environment (stimuli) cannot be detected and ...
Read More →The brain is responsible for
[question] Question. The brain is responsible for (A) thinking. (B) regulating the heart beat. (C) balancing the body. (D) all of the above. [/question] [solution] solution: (D) all of the above. [/solution]...
Read More →How do gymnosperms and angiosperms differ from each other?
[question] Question. How do gymnosperms and angiosperms differ from each other? [/question] [solution] Solution: [/solution]...
Read More →The gap between two neurons is called a
[question] Question. The gap between two neurons is called a (A) dendrite. (B) synapse. (C) axon. (D) impulse. [/question] [solution] solution: (B) synapse. [/solution]...
Read More →How are pteridophytes different
[question] Question. How are pteridophytes different from the phanerogams or spermatophytes ? [/question] [solution] Solution: [/solution]...
Read More →Which of the following is a plant hormone?
[question] Question. Which of the following is a plant hormone? (A) Insulin (B) Thyroxin (C) Oestrogen (D) Cytokinin. [/question] [solution] solution: (D) Cytokinin [/solution]...
Read More →Which division among plants has the simplest organisms?
[question] Question. Which division among plants has the simplest organisms? [question] [solution] Solution: Thallophyta is the division of plants that has the simplest organisms. This group includes plants, which do not contain a well differentiated plant body. Their body is not differentiated into roots, stems, and leaves. They are commonly known as algae. [/solution]...
Read More →Why are some patients of diabetes treated
[question] Question. Why are some patients of diabetes treated by giving injections of insulin? [/question] [solution] solution: This is a hormone which is produced by the pancreas and helps in regulating blood sugar levels. If it is not secreted in proper amounts, the sugar level in the blood rises causing many harmful effects. [/solution]...
Read More →In the Hierarchy of classification,
[question] Question. In the hierarchy of classification, which grouping will have the smallest number of organisms with maximum common characteristics in and which will have the largest number of organisms? [question] [solution] Solution: In the hierarchy of classification,a species will have the smallest number of organisms with a maximum of characteristics in common, whereas the kingdom will have the largest number of organisms. [solution]...
Read More →How does our body respond when adrenaline
[question] Question. How does our body respond when adrenaline is secreted into the blood? [/question] [solution] solution: Adrenal glands release adrenaline into blood. (i) The heart begins to beat faster resulting in supply of more oxygen to the muscles. (ii) The blood to the digestive system and skin is reduced due to the contraction of smooth muscles around small arteries in these organs.This diverts the blood to our skeletal muscles. (iii) The breathing rate increases because of the contrac...
Read More →In which kingdom will you place an organism which is single-celled,
[question] Question. In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic? [question] [solution] Solution: Kingdom Protista includes single celled, eukaryotic, and photosynthetic organisms. [solution]...
Read More →What is the criterion for classification
[question] Question. What is the criterion for classification of organisms as belonging to kingdom Monera or Protista? [/question] [solution] Solution: The criterion for the classification of organisms belonging to kingdom Monera or Protista is the presence or absence of a well-defined nucleus or membrane-bound organelles. Kingdom Monera includes organisms that do not have a well-defined nucleus or membrane-bound organelles and these are known as prokaryotes. Kingdom Protista, on the other hand,...
Read More →Why is the use of iodised salt advisable?
[question] Question. Why is the use of iodised salt advisable? [/question] [solution] solution: Iodine is important for the thyroid gland to make thyroxin hormone. Thyroxine regulates carbohydrates, proteins and fat metabolism in the body so as to provide the best balance for growth. If iodine is deficient in the diet, thyroxine cannot be produced and the thyroid gland at the neck swells, a condition called goitre. Use of iodized table-salt can provide the required amount of iodine in the diet. ...
Read More →How does chemical coordination
[question] Question. How does chemical coordination take place in animals? [/question] [solution] solution: Hormones –They are secretions of the endocrine glands and one of the most important substance that controls the body chemistry, also known as "Chemical messengers." [/solution]...
Read More →Design an experiment to demonstrate hydrotropism.
[question] Question. Design an experiment to demonstrate hydrotropism. [/question] [solution] solution: Aim : To demonstrate that root shows hydrotropism. Method Place germinating seeds in moist saw dust contained in a sieve. Observation (i) The radicles pass down and come out of the sieve pores under the influence of gravity. (ii) After some growth, radicles move back and enter the saw dust again. (i) This shows that roots shows both hydrotropic response and geotropic response. (ii) The hydrotr...
Read More →Will advanced organisms be the same as complex organisms? Why?
[question] Question. Will advanced organisms be the same as complex organisms? Why? [/question] [solution] Solution: It is not always true that an advanced organism will have a complex body structure. But, there is a possibility that over the evolutionary time, complexity in body design will increase. Therefore, at times, advanced organisms can be the same as complex organisms. [/solution]...
Read More →How do auxins promote the growth
[question] Question. How do auxins promote the growth of a tendril around a support? [/question] [solution] solution: When the tip of the tendril touches a support, the auxins present on its tip moves to the side of tip which is away from the support, so due to more auxins in its tendrils away from the support grows faster. [/solution]...
Read More →From the pair of linear equations for the following problems and find their solution by substitution method.
[question] Question. From the pair of linear equations for the following problems and find their solution by substitution method. (i) The difference between two numbers is 26 and one number is three times the other. Find them. (ii) The larger of two supplementary angles exceeds the smaller by 18 degrees. Find them. (iii) The coach of a cricket team buys 7 bats and 6 balls for Rs. 3800. Later, she buys 3 bats and 5 balls for Rs. 1750. Find the cost of each bat and each ball. (iv) The taxi charges...
Read More →Give an example of a plant hormone
[question] Question. Give an example of a plant hormone that promotes growth. [/question] [solution] solution: Auxins [/solution]...
Read More →Which organisms are called primitive
[question] Question. Which organisms are called primitive and how are they different from the so-called advanced organisms? [question] [solution] Solution: A primitive organism or lower organism is the one which has a simple body structure and ancient body design or features that have not changed much over a period of time. An advanced organism or higher organism has a complex body structure and organization which they have acquired relatively recently. For example, an amoeba is more primitive a...
Read More →How is the movement of leaves of the sensitive plant different
[question] Question. How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light? [/question] [solution] solution: [/solution]...
Read More →On what basis are plants and animals
[question] Question. On what basis are plants and animals put into different categories? [/question] [solution] Solution: Plants and animals differ in many features such as the absence of chloroplasts, presence of cell wall, etc. But, locomotion is considered as the characteristic feature that separates animals from plants. This is because the absence of locomotion in plants gave rise to many structural changes such as the presence of a cell wall (for protection), the presence of chloroplasts (f...
Read More →What are plant hormones?
[question] Question. What are plant hormones? [/question] [solution] solution: Plant hormones help to coordinate growth, development and response to the environment. They are synthesized in minute quantity in one part of the plant body and simply diffuse to another part, where they influence specific physiological processes. Example Auxins. [/solution]...
Read More →What is the primary characteristic
[question] Question. What is the primary characteristic on which the broad division of organisms is made? [/question] [solution] Solution: The primary characteristic on which the first division of organisms is made is the nature of the cell. It is considered to be the fundamental characteristic for classifying all living organisms. Nature of the cell includes the presence or absence of membrane-bound organelles. Therefore, on the basis of this fundamental characteristic, we can classify all livi...
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