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Ribs move upwards and outwards when we-

Question 41
Endoskeleton of fishes are made up of cartilage and bone; classify the following fishes as cartilaginous or bony: Torpedo, Stingray, Dogfish, Rohu, Anglerfish, Exocoetus.

Mention two means of physical contacts by which AIDS does not spread.

__ (Axial / Appendicular) skeleton includes the basic central framework of the body.

Write down four main characters of chordates.

संगतकार
किन-किन
रूपों
में
मुख्य
गायक-गायिकाओं
की
मदद
करते
हैं?

Name the following :

(a) Smallest cell organelle

(b) Largest cell organelle;

(c) ER studded with ribosomes

(d) Functional segments of DNA molecule.

Name the book written by Carolus Linnaeus on classification of organisms.

Why are xylem and phloem are called vascular or conducting tissues? [1 MARK]

1. How does osmosis helps in food preservation?

2. Plants mostly have dead cells on their body surface. On the other hand, most animals have living cells on their surface. Why?

Which organelle is not found in the human cheek cell and why?

Tina observed a permanent slide of a plant tissue with thin walled cells, loosely packed with large intercellular spaces. Identify the tissue.

Why does the life exist on earth?Write 3 conditions

Question 12

While using iodine in the laboratory, some drops of iodine fell on Paheli's socks and some fell on her teacher's saree. The drops of iodine on the saree turned blue-black while their colour did not change on the socks. What can be the possible reason?

Match the following diseases with their vectors.

$\begin{array}{cc}\text{Disease}& \text{Vector}\\ a)\text{Malaria}& i)\text{Flea}\\ b)\text{Dengue}& ii)\text{Tse-tse fly}\\ c)\text{Sleeping sickness}& iii)\text{Aedes mosquito}\\ d)\text{Plague}& iv)\text{Anopheles mosquito}\end{array}$

What are the desirable agronomic characteristics for crop improvements?

(a) The nutrient present in citrus fruits.

(b) Vitamins/minerals present in milk.

What are the identifying features of collenchyma tissues?

Explain crop rotation, mixed farming and inter cropping. [3 marks]

Two water tanks which hold equal quantity are present at two ends of the garden.

Kumar connected perpendicular pipes with nozzles through a long pipe to one tank.

John channelised water from another water tank in such a way that the water reaches slowly to the roots of plants.



What kind of irrigation method was used by Kumar and John respectively?

Urination is categorized as

The main aim of cellular respiration is to produce energy.

The molecule that enters the process of cellular respiration is

Question 03(i)
Internal fertilization occurs_________.

A

B

Picture A shows a very common condition observed in areas which receive heavy rainfall.
Picture B shows the little plants that grow on those bricks.

Identify the plants and their category.

Question 9 (iii)

Carry out the following osmosis experiment:

Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,

(a) Keep cup A empty

(b) Put one teaspoon sugar in cup B

(c) Put one teaspoon salt in cup C

(d) Put one teaspoon sugar in the boiled potato cup D.

Keep these for two hours. Then observe the four potato cups and answer the following:



(iii) Explain why water does not gather in the hollowed out portions of A and D.

Assertion (A): A complex of blood vessels beginning and ending in capillaries through which blood circulates before returning to the heart is called a portal system.

Reason (R): All mammals have a hepatic portal system.

Nitrogen is fixed by rizobium bacteria any time or at the time of lightning only. How Industry help in nitrogen fixation and when oxygen react with nitrogen to form dilute nitric acid, is it not affecting the plant ( harm to plant because it is acid)