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101.

In animals , growth rate isA. uniformB. linearC. differentialD. slow

Answer» Correct Answer - C
Discussion
102.

Assertion Growth curve of higher animals is sigmoid. Reason Absolute growth is the difference between initial and final weight/size of an organism.

Answer» Correct Answer - B
Growth curve is the graphic representation of the growth of a living organism. Growth curve of higher animals, including man, is S-shpaed and is called sigmoid growth curve. The difference between the intial and final weight (or size) of an individual in a given period of time is called absolute growth.
Discussion
103.

Assertion Growth of different body parts is differential. Reason During human growth, muscles show minimum growth, while brain shows maximum growth.

Answer» Correct Answer - C
The growth rate is not uniform, but it is different at different period of life. So, the growth is differential. In human beings, the muscles show maximum growth, i.e. from 0.8 kg in newly born body to 30 kg in adult, while brain shows minimum growth, i.e. from 0.4 kg in newly born body to 1 kg in adult, from birth to adulthood.
Discussion
104.

Assertion In ageing, power of intake of useful materials and expelling of harmful materials out of the cells both decrease. Reason With age, collagen protein of connective tissue becomes less flexible, less permeable and insoluble.

Answer» Correct Answer - A
Collagen froms about `40%` of total protein contents of the body in young age-groups. It is permeable, flexible and soluble, cytoplasm and interstitial fluid through the semipermeable cell membrane. But with advancing age, the collagen protein becomes less flexible, less permeable and insoluble.
Due to these changes, there is a decreased inflow of nutritive substances and oxygen into the cells and also decreased loss of nitrogenous wastes and `CO_(2)` from the body cells. This causes decreased efficiency of body cells and induces ageing.
Discussion
105.

Regeneration of Hydra will be faster it it is cut of fromA. headB. middle bodyC. tentaclesD. Both (a) and (c)

Answer» Correct Answer - C
Discussion
106.

In which of the following animal group, neoblasts cells are present?A. ProtozoansB. ProiferansC. CoelenteratesD. Planarians

Answer» Correct Answer - D
Discussion
107.

The voluntary casting off a part of the body when an animal is attacked is known asA. autotomyB. autogamyC. amputationD. regeneration

Answer» Correct Answer - A
Discussion
108.

Assertion. Smaller the organism, higher is the rate of metabolism per gram weigth. Reaons. The heart rate of six months old bady is much higher than that of personA. if both are true and reason is correct explanationB. both are true reason is not correct explanationC. assertion is true but reason is wrongD. and both are wrong

Answer» Correct Answer - A
Discussion
109.

In human beings, which part shows the minimum increase in weight from birth to adulthood ?A. MusclesB. SkeletonC. FatD. Brain

Answer» Correct Answer - D
Discussion
110.

In human beings, which part shows the minimum increase in weigth from birth to adulthood ?A. MusclesB. SkeletonC. FatD. Brain

Answer» Correct Answer - D
Discussion
111.

Adult females tend to have less weight than adult males due to lesser development ofA. MusclesB. SkeletonC. Both muscles and skeletonD. Fat

Answer» Correct Answer - C
Discussion
112.

In human beings, which part shows the maximum increase in weight from birth to adulthood?A. BrainB. FatC. MusclesD. Skeleton

Answer» Correct Answer - C
Discussion
113.

Approximate age of sexual maturity in human beings isA. 10-14 yearsB. 8-11 yearsC. 10-13 yearsD. 11-16 years

Answer» Correct Answer - D
Discussion