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Genetic drift is an account of ………………………

The diagram below shows an experiment in which: [3 MARKS]
(a) Leaf A was coated with grease on both surfaces.
(b) Leaf B was coated with grease on the lower surface.
(c) Leaf C was coated with grease on the upper surface.
(d) Leaf D was left without any application of grease.

Answer the following:
(i) Which leaf dries first?
(ii) Which leaf dries last?
(iii) Which leaf does not show any change?

How many cranial and spinal nerves are present in the human body which constitute the peripheral nervous system?

Which one is true about guttation?

Ramesh started going for regular morning walks for controlling his blood sugar level. He did so for a monthand also started taking Yoga lessons, without going for any pathological examination. He underwentpathological test after two months and found that the blood sugar level has come down. Presuming that hehad no changed his food habits during these two months, which statement among the alternatives givenbelow follows most logically ?

Give two examples of food items that’s prepared by the help of microorganism other than curd? How is curd formed? [3 MARKS]

If here we have two parents of a child father is of fair complexion and mother is of dark complexion then what sort of gene will be inherited to the offspring whether child will have fair or dark complexion if fair is considered as recessive trait and dark as dominant

How do we prevent and cure allergy

Which feature of adipose tissue helps in the survival of polar bears in extremely cold conditions?

Match the spinal nerves mentioned in column I with the number listed in column II and select the right answer containing the correct matching of the alphabets of the two columns

$\begin{array}{cccc}& \text{Column I-}& & \text{Column -II}\\ & \text{Spinal nerves}& & \text{Number}\\ A& \text{Lumber nerves}& e& \text{1 pair}\\ B& \text{Cervical nerves}& f& \text{12 pairs}\\ C& \text{Thoracic nerves}& g& \text{8 pairs}\\ & & h& \text{5 pairs}\end{array}$

Pellagra is caused due to deficiency of _______.

How do you destarch a plant?

Excretion primarily involves

(a) removal of all byproducts during catabolism.

(b) removal of byproducts during anabolism.

(c) removal of nitrogenous wastes.

(d) throwing out excess water

What is autogamy?

Which of the following organisms have double circulation?

What would happen to a marine fish placed in fresh water? Also explain why.

The system that carries nerve impulses back and forth between the central nervous system and the skeletal muscles, skin and sensory organs is called ___

An action potential is _____.

The arrangement of (i) cells and (ii) nuclei in a typical embryo sac is -

Which organelle in the cell is responsible for photosynthesis?

Name the defect of the eye in which a portion of the object is seen focused while the other portion is blurred.

In the Metaphase stage of Mitosis, each chromosome consists of _____ chromatid (s), _______ centromere(s), _______kinetochore(s) and ______ unit(s) of DNA .

The burning of household garbage generates

Percentage of homozygous dominant individuals obtained from selfing Rr individuals is

Consider the following statements. Which of them are true?

1. There are three main parts in a neuron - a cell body, an axon and dendrites.

2. The cytoplasm is thick here and contains granular substances called Nissl's bodies.

3. Branched processes termed dendrites arise from the cell body of a neuron.

4. All neurons have only one axon.

Sort the following hormones based on whether they are human or plant hormone.

1) Auxins
2) Adrenaline
3) Progesterone
4) Gibberllins
5) Ethylene
6) Prolactin
7) Cytokinin
8) Calcitonin

__ is a suspension of weakened or killed disease causing microorganism

Which of the following causes unprovoked seizures in a patient?

The author calls sparrow a friendly bird because

The organisms which can reproduce by fragmentation are:
(a) Corals and Sponges
(b) Corals and Spirogyra
(c) Sea anemone and Spirogyra
(d) Sponges and Sea anemones

Which of the following is not caused by a growth movement?

(a) bending of the shoot of a plant in response to light

(b) closing up of leaves of a sensitive plant on touching with an object

(c) climbing up of a plant on an object by using tendrils

(d) movement of the root of a plant towards a source of water

Have a look at the posture of this girl who is reading a book and answer the questions which follow :
(a) Name the problem she is facing
(b) What are the two conditions shown in sections A and B of the eye as applicable to her.
(c) What kind of reading glasses does she need?

Where exactly does the electrical conduction in the heart takes place?

The secretion of ________ gland is highly nutritious for the new-born baby.

Non-directional movement of plants in response to external stimuli is called:

Explain the functioning of nephrons

Which hormone increases blood pressure and why?

A scientist removed some cells from the growing point of a plant and placed them in a suitable medium leading to the formation of a shapeless lump of mass X. X is then transferred to another medium which stimulates it to develop roots. When X with developed roots is placed in yet another medium, then it develops shoots to form tiny plantlets. These plantlets can then be transplanted in pots or soil where they can grow to form mature plants.
(a) What is the shapeless lump of mass X known as?
(b) What name is given to this method of producing new plants?
(c) The growth medium used in this method contains plant nutrients in the form of a 'jelly'. Name this jelly.
(d) What is the general name of chemicals used to stimulate the growth of plant cells and the development of roots and shoots?
(e) Name any two plants which are produced by this method.
(f) State any two advantages of this method of producing plants.
(g) What is the other name of this method [other than that given in (b) above]?

______ emission is mainly responsible for the global warming.

In tall coniferous plants, what helps in the transportation of water and minerals to leaves or branches present at the peak?

When carrying out the starch test on a leaf, why is it important to boil the leaf in alcohol ?
(a) to dissolve the waxy cuticle
(b) to make the cells more permeable to iodine solution
(c) to remove the chlorophyll
(d) to stop chemical reactions in the cells.

Does molecular movement means chemical reactions taking places in a living body which make life processes ? Movement of molecules also happen in other forms of state can they also be called living?

Which virus causes influenza?

Study the pedigree chart given below.

It demonstrates: