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Important Questions (1 mark): Natural Resources


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25 Questions MCQ Test Science Class 9 | Important Questions (1 mark): Natural Resources

Important Questions (1 mark): Natural Resources for Class 9 2022 is part of Science Class 9 preparation. The Important Questions (1 mark): Natural Resources questions and answers have been prepared according to the Class 9 exam syllabus.The Important Questions (1 mark): Natural Resources MCQs are made for Class 9 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions (1 mark): Natural Resources below.
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Important Questions (1 mark): Natural Resources - Question 1

Major protein of connective tissue is:

Detailed Solution for Important Questions (1 mark): Natural Resources - Question 1

The organic portion or protein fibers found in connective tissues are either collagen, elastic, or reticular fibers. Collagen fibers provide strength to the tissue, preventing it from being torn or separated from the surrounding tissues.

Important Questions (1 mark): Natural Resources - Question 2

Light bands of muscle fibre are made of the protein:

Detailed Solution for Important Questions (1 mark): Natural Resources - Question 2 Muscles are composed of bundles of single large cells (called muscle fibers) that form by cell fusion and contain multiple nuclei. Each muscle fiber contains many myofibrils, which are bundles of actin and myosin filaments organized These bands correspond to the presence or absence of myosin filaments.
Important Questions (1 mark): Natural Resources - Question 3

Canaliculi are found associated with:

Important Questions (1 mark): Natural Resources - Question 4

Processes from osteoblasts are found in :

Important Questions (1 mark): Natural Resources - Question 5

The bone marrow is composed of :

Important Questions (1 mark): Natural Resources - Question 6

The longitudinal canals of the bone are called :

Important Questions (1 mark): Natural Resources - Question 7

Volkmann's canals occur in :-

Important Questions (1 mark): Natural Resources - Question 8

A tissue is a :

Important Questions (1 mark): Natural Resources - Question 9

Endothelium of the inner surface of blood vessels in vertebrates is formed

Important Questions (1 mark): Natural Resources - Question 10

Cells of squamous epithelium are

Important Questions (1 mark): Natural Resources - Question 11

The protein deposited in the dead superficial cells that make the skin epithelium impervious to water is

Detailed Solution for Important Questions (1 mark): Natural Resources - Question 11

Correct Answer :- a

Explanation : Keratinised stratified squamous epithelium is a compound epithelium which covers the dry surface of  skin. It has many layers of epithelial cells .The deeper layers are formed by polygonal cells but superficial layers constitute  horny, scale like remains of dead squamous cells .Heavy deposits of the insoluble protein keratin in the dead superficial cells make the epithelium impervious to water and highly resistant to mechanical abrasions.

Important Questions (1 mark): Natural Resources - Question 12

Horns of most mammals are composed of

Important Questions (1 mark): Natural Resources - Question 13

Mammary glands are modified

Important Questions (1 mark): Natural Resources - Question 14

Which of the following tissue has matrix, that is the source of its structural and functional performances?

Important Questions (1 mark): Natural Resources - Question 15

Wrinkling in old age is due to

Important Questions (1 mark): Natural Resources - Question 16

Dermis of mammalian skin is mainly composed of

Important Questions (1 mark): Natural Resources - Question 17

Fat is abundant in

Detailed Solution for Important Questions (1 mark): Natural Resources - Question 17

Adipose tissue, or fat, is an anatomical term for loose connective tissue composed of adipocytes.

Its main role is to store energy in the form of fat, although it also cushions and insulates the body.

Obesity in animals, including humans, is not dependent on the amount of body weight, but on the amount of body fat - specifically adipose tissue.

Important Questions (1 mark): Natural Resources - Question 18

Tendon connects

Important Questions (1 mark): Natural Resources - Question 19

Cartilage is produced by

Important Questions (1 mark): Natural Resources - Question 20

Bone forming cells are

Important Questions (1 mark): Natural Resources - Question 21

Bone marrow is important for

Important Questions (1 mark): Natural Resources - Question 22

Haversian system is typically found in bones of

Important Questions (1 mark): Natural Resources - Question 23

Blood is

Important Questions (1 mark): Natural Resources - Question 24

Mammalian erythrocytes are

Important Questions (1 mark): Natural Resources - Question 25

Life span of RBC is

Detailed Solution for Important Questions (1 mark): Natural Resources - Question 25

RBC's also known as red blood cells are formed in the bone marrow by erythropoiesis. They have an average lifespan of 120 days.  After ageing, they are selectively recognized in the spleen, liver and lymph nodes by macrophages followed by phagocytosis. This process is called eryptosis
So, the correct answer is '120 days'.

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