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Biology in Human Welfare

: 12 th Seat No. First Term Examination Time: 2: 30 {Hr} Note:

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: 12 th Seat No. First Term Examination Time: $2 : 30 Hr$ Note: 1) Allques Subject : Biology Marks : 50 2) Neat dial mpulsory; 3) Answern be drawn whichever neastsary Q. I Select and Section-A 1. Sporode made up of.

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: 12 th Seat No. First Term Examination Time:

2 : 30 Hr

Note: 1) Allques Subject : Biology Marks : 50 2) Neat dial mpulsory; 3) Answern be drawn whichever neastsary Q. I Select and Section-A 1. Sporode made up of.

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Practice more questions on Biology in Human Welfare

Question 1

Medium

(i) List the different attributes that a population has and not an individual organism.
(ii) What is population density ? Explain any three different ways the population density can be measured, with the help of an example each.

Topic:

Organisms and Populations

Book:

Oswaal CBSE Question Bank Class 12 Biology Chapterwise and Topicwise (Oswaal)

View solution

Question 2

Easy

Which of the following food items are produced through fermentation by the microorganisms?
I. Idli
II. Dosa
III. Toddy
IV. Cheese
Choose the correct option

I, II and III
I, III and IV
II, III and IV
I, II, III and IV

Topic:

Microbes in Human Welfare

View 2 solutions

Question 3

Medium

Animal breeding is producing improved breeds of …A… by improving their …B… through selective mating. Here A and B refers to

A-domesticated animals, B-phenotype
A-wild animals, B-genotype
A-domesticated animals, B-genotype
A-wild animals, B-phenotype

Topic:

Strategies for Enhancement in Food Production

View solution

Question 4

Medium

Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character.

The female parent is heterozygous.
The parents could not have had a normal daughter for this character.
The trait under study could not be colourblindness.
The male parent is homozygous dominant.

Topic:

Principles of Inheritance and Variation

Book:

Xtract Objective Biology for NEET (Disha)

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Students who ask this question also asked

Question 1

Water pollution is cuased due to

industrial effluents
agricultural discharges
sewage and other wastes
all of these

Topic:

Biology in Human Welfare

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Question 2

Can you list the changes seen in human beings that are indicative of reproductive maturity? Among animals, for example birds, do they lay eggs all through the year? Or is it a seasonal phenomenon? What about other animals like frogs and lizards? You will notice that, birds living in nature lay eggs only seasonally. However, birds in captivity (as in poultry farms) can be made to lay eggs throughout the year. In this case. laving eggs is not related to reproduction but is a commercial exploitation for human welfare. The females of placental mammals exhibit cyclical changes in the activities of ovaries and accessory ducts as well as hormones during the reproductive phase. In non-primate mammals like cows, sheep, rats, deers, dogs, tiger, etc.. such cyclical changes during reproduction are called oestrus cycle where as in primates (monkeys, apes, and humans) it is called menstrual cycle. Many mammals, especially those living in natural, wild conditions exhibit such cycles only during favourable seasons in their reproductive

Topic:

Biology in Human Welfare

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Question 3

Which one is the case of competitive exclusion ?

Introduction of goat removed abingdon tortoise in Galapagos island
Darwin's Finches in Galapagos Island
Balanus and Chathamalus in rocky coast of Scotiand
More than one option is correct

Topic:

Biology in Human Welfare

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Question 4

V

shaped Triangular 2. Write short note any two

Pieiotropic
Test cross
Linkage
Competition

Topic:

Biology in Human Welfare

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Question Text	: 12 th Seat No. First Term Examination Time: $2 : 30 Hr$ Note: 1) Allques Subject : Biology Marks : 50 2) Neat dial mpulsory; 3) Answern be drawn whichever neastsary Q. I Select and Section-A 1. Sporode made up of.
Topic	Biology in Human Welfare
Subject	Biology
Class	Class 12